A modelled thread hovers, lights and selects as one surface

A modelled thread is thousands of small faces (26,518 for an M8 x 100), and the
pointer over it found the vertices and edges between them, lit one sliver at a
time, and a click selected one sliver. Now the thread is one surface to point at:

- Which faces belong to a thread comes from what made them: a face made by a
  Thread feature is named after it (F<id>:...), a piece of a face the thread
  cut names it among the faces around it. The pieces of one face of an
  imported file group the same way. The names of a big body take seconds, so
  the groups are worked out on a worker, once per body
  (doc::face_groups::face_groups_soon), and nothing waits for them.
- Hover: over a thread the pointer lands on the surface (the edges and
  vertices between the thread's own faces are no boundary to pick), and the
  whole thread lights up, outlined where it meets the rest of the body. The
  highlight is kept while the pointer moves over the thread. A face small on
  screen (a finely faceted surface) wins over vertices and edges further than
  two points away.
- Click: the thread is one item in the selection; shown, and given to a
  command that takes faces, it stands for every face of the thread.
- Thousands of selected faces are drawn in one pass per body and hashed by
  index, not written out, every frame.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.cargo/mutants.toml

@@ -0,0 +1,14 @@
+# cargo-mutants (docs/mutation-testing.md). Mutants are judged by the black-box suites that will
+# outlive the kernel backend: the reference tests (tests/oracle, through the oracle_cases test)
+# and the pull-request sample of the robustness goldens (every 8th seed, as ci.yml). The
+# kernel's own unit tests are left out on purpose: a mutant only they catch is a behaviour the
+# backend-neutral suites would miss when the kernel is swapped.
+profile = "mutants"
+additional_cargo_test_args = [
+    "--test", "oracle_cases", "--lib", "--", "--include-ignored",
+    "oracle_suite",
+    "robustness_goldens::seed_00", "robustness_goldens::seed_08", "robustness_goldens::seed_16",
+    "robustness_goldens::seed_24", "robustness_goldens::seed_32", "robustness_goldens::seed_40",
+    "robustness_goldens::seed_48", "robustness_goldens::seed_56", "robustness_goldens::seed_64",
+    "robustness_goldens::seed_72", "robustness_goldens::seed_80", "robustness_goldens::seed_88",
+]

.config/nextest.toml

@@ -1,20 +1,26 @@
 # cargo-nextest settings for CI (`cargo xtask test` does not use nextest).
-# PR runs build the tests once and run them in 4 shards (.github/workflows/ci.yml).
+# CI builds the tests once and runs them in shards: 2 for a pull request, 4 for main and the nightly
+# (.github/workflows/ci.yml).
 
 [profile.ci]
-# Heavy tests (one to four minutes each on a CI runner) that pull requests skip. They run on
-# every push to main and nightly (`--ignore-default-filter`), and in `cargo xtask test`.
+# Heavy tests (one to twelve minutes each on a CI runner) that pull requests skip. They run on
+# every push to main and nightly (`--ignore-default-filter`), and in `cargo xtask test`. The
+# boolean_props property tests run only nightly (ci.yml excludes them from pushes to main).
 # Keep this list in sync with docs/book/src/dev/testing.md and CONTRIBUTING.md.
 default-filter = """
 not (
     (package(solidcraft-engine) & (
         test(=tests::hostile_params_never_panic)
         | test(/^tests::robustness::/)
+        | test(/^tests::robustness_goldens::seed_/)
         | test(=pattern_suppress_tests::enclosure_arc_extinction_keeps_a_real_sharp_inner_lip_after_resize_and_reopen)
         | test(=pattern_suppress_tests::enclosure_datums_follow_wall_height_and_board_depth_with_material_proofs)
         | test(=cmd::plastic::tests::enclosure_snap_fit_follows_resized_front_wall)
     ))
     | (package(solidcraft-kernel) & test(=tests::boolean_identity_on_tangent_primitives))
+    | (package(solidcraft-kernel) & test(=tspline::tests::hostile_tsplines_never_panic))
+    | (package(solidcraft-kernel) & binary(boolean_props))
+    | (package(solidcraft-engine) & binary(atomic_commands))
     | (package(solidcraft-ui-egui) & binary(scenarios) & test(=acceptance_sensor_enclosure))
 )
 """
@@ -27,3 +33,38 @@ slow-timeout = { period = "60s" }
 
 [profile.ci.junit]
 path = "junit.xml"
+
+# The action matrix sample runs its designs in parallel worker processes, one per CPU. Run with
+# other tests beside it (the heavy ones on main), a pi-case hole that takes 8 s alone (#952 makes
+# it a real hole) went past the matrix's 90 s action limit. It runs on its own.
+[[profile.ci.overrides]]
+filter = "binary(action_matrix) & test(=action_matrix_sample)"
+threads-required = "num-cpus"
+
+
+# The slowest tests start first, so a shard does not end with one of them running alone on a
+# core while the others sit idle (seed_81 alone takes about 20 minutes under CI load). Medians
+# from the CI test timings (the junit artifacts), slowest first; a test over ~100 s belongs here.
+[[profile.ci.overrides]]
+filter = """
+(package(solidcraft-engine) & (
+    test(/^tests::robustness_goldens::seed_(81|45|20|24|95|02|57|40|18|48|32|46|85|61)$/)
+    | test(/^tests::robustness::/)
+    | test(=tests::hostile_params_never_panic)
+    | test(=cmd::clearance::tests::distances_are_exact_on_edges_and_curved_faces)
+    | test(=cmd::clipboard::tests::a_pasted_coil_joins_the_pasted_body)
+    | test(=tests::pleat_join::the_pleats_join_at_every_wall_from_2_4_to_2_6_mm)
+    | test(=tests::flush_join_loft::a_flange_flush_with_the_end_of_a_bent_tapered_tube_joins)
+    | test(=cmd::sheet::tests::perforated_sheet_takes_a_thousand_round_holes)
+    | test(=boolean_regression_tests::joined_loft_frames_plan_their_display_at_every_quality)
+))
+| (package(solidcraft-engine) & (binary(atomic_commands) | binary(step_export_regressions)))
+| (package(solidcraft-kernel) & (
+    test(=curveblend::tests::rolling_ball_turns_about_a_rounded_corner_of_its_radius)
+    | test(=tests::fillet_tabbed_plate_outer_loop_and_partial_selection_after_hole)
+    | test(=tspline::tests::hostile_tsplines_never_panic)
+    | test(=fill::tests::regular_rims_of_three_to_eight_sides_fill_with_one_face_and_close_the_cup)
+    | test(/^issue_788_tests::equal_bores_crossing_/)
+))
+"""
+priority = 100

.github/FUNDING.yml

@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: [bherbruck]
+ko_fi: bherbruck

.github/ISSUE_TEMPLATE/bug.yml

@@ -0,0 +1,41 @@
+name: Bug report
+description: Something in SolidCraft does the wrong thing
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report this! Inside the app, **Report an Issue** fills most of this in for you, with the command, its settings and your environment.
+  - type: textarea
+    id: what
+    attributes:
+      label: What happened
+      description: What did you expect, and what happened instead?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: |
+        What you clicked or typed, in order. For a problem on a particular design, `solidcraft-cli script design.solidcraft --out repro.json` turns its history into a script that `solidcraft-cli eval repro.json` replays; attach it, trimmed to the failing step if you can.
+      placeholder: |
+        1. Sketch a circle on the XY plane
+        2. Extrude it 10 mm
+        3. Fillet the top edge with 6 mm
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: SolidCraft version and OS
+      description: Help → About shows the version.
+      placeholder: 0.15.0, Windows 11
+    validations:
+      required: true
+  - type: textarea
+    id: media
+    attributes:
+      label: Screenshots or recording
+      description: |
+        For anything you can see in the app, a screenshot or short recording of a small example helps the most. Please leave out private designs and personal details.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,21 +0,0 @@
----
-name: Bug report
-about: Help reproduce and fix a SolidCraft problem
-title: ''
-labels: ''
-assignees: ''
----
-
-## Behavior
-
-What did you expect, and what happened instead?
-
-## Reproduction
-
-Include steps, SolidCraft version/commit and relevant environment details. Prefer a small example without private design data.
-
-## Screenshots of the behavior (when observable)
-
-For observable CAD, UI or model behavior, include actual descriptive screenshots or a short recording from a small reproduction. This includes kernel, geometry, assembly and backend effects that can be shown in the app. Coding agents should run the app and capture the evidence themselves, rather than asking a human for evidence they can produce. Show the actual failure/result, preferably before and after, with brief steps, expected/actual behavior and annotations where helpful.
-
-Flowcharts and Mermaid diagrams cannot substitute for evidence of visible behavior. Use diagrams for architectural reasoning when actual screenshots cannot illustrate the point. Changes with no useful observable behavior may omit screenshot/video evidence. Exclude private designs and sensitive details; attach media or link to an accessible recording rather than committing generated review artifacts.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,7 @@
+# Blank issues stay on: the app's Report an Issue opens issues/new?title=…&body=… with the report
+# filled in (crates/ui-egui/src/issue_report.rs), which GitHub drops when blank issues are off.
+blank_issues_enabled: true
+contact_links:
+  - name: Questions and chat
+    url: https://discord.gg/FtU4NQNVDH
+    about: Ask questions and talk with users and contributors on the SolidCraft Discord.

.github/ISSUE_TEMPLATE/feature.yml

@@ -0,0 +1,16 @@
+name: Feature request
+description: Something SolidCraft should do
+labels: [enhancement]
+body:
+  - type: textarea
+    id: goal
+    attributes:
+      label: What are you trying to do
+      description: The part or workflow you have in mind, and where SolidCraft gets in the way today.
+    validations:
+      required: true
+  - type: textarea
+    id: idea
+    attributes:
+      label: How you imagine it working
+      description: Optional. Describe the behaviour in your own words; please don't paste another product's documentation.

.github/actionlint.yaml

@@ -0,0 +1,10 @@
+self-hosted-runner:
+  labels:
+    - self-hosted-fast
+    - self-hosted-light
+    # Blacksmith (see the top of workflows/ci.yml).
+    - blacksmith-2vcpu-ubuntu-2404
+    - blacksmith-4vcpu-ubuntu-2404
+    - blacksmith-8vcpu-ubuntu-2404
+    - blacksmith-16vcpu-ubuntu-2404
+    - blacksmith-8vcpu-windows-2025

.github/release-notes.md

@@ -1,62 +1,26 @@
 SolidCraft is open-source parametric 3D CAD in Rust: sketch, constrain, extrude, and change a
-parameter to watch the timeline rebuild. [Documentation](https://bherbruck.github.io/solidcraft/)
-· [try it in the browser](https://bherbruck.github.io/solidcraft/app/) ·
+parameter to watch the timeline rebuild. [Documentation](https://docs.solidcraft.io/)
+· [try it in the browser](https://solidcraft.io/app) ·
 [contributing](https://github.com/bherbruck/solidcraft/blob/main/CONTRIBUTING.md) ·
 [issues](https://github.com/bherbruck/solidcraft/issues). AI agents can model with it over MCP:
-`solidcraft-cli mcp` ([how](https://bherbruck.github.io/solidcraft/guide/mcp.html)).
+`solidcraft-cli mcp` ([how](https://docs.solidcraft.io/guide/mcp.html)).
 
-**Why 0.6:** this is a minor bump because two things change the files you work with: the
-rename to SolidCraft and the new design file format. Files from earlier builds open fine, but
-builds 0.5 and older can't open designs saved by 0.6.
+**What's new** in SolidCraft {version} is listed below, and the
+[ROADMAP](https://github.com/bherbruck/solidcraft/blob/main/ROADMAP.md#known-limitations) lists
+the known limitations. Designs from every earlier version open in this one.
 
-**What's new**
-- **New design file format.** Saves are a zip container by default; plain JSON is still one
-  click away (details below).
-- **Sheet metal:** flange corners close at any angle, and cut-outs fold across bends at any
-  angle, including curved bends.
-- **Crash reports:** after a crash, Help ▸ Crash Reports… shows what happened with a ready-to-file
-  issue draft. Reports stay on your computer; nothing is sent. `solidcraft-cli crashes` lists and
-  replays them.
-- **Snap package** for x86_64 and aarch64 on every release, alongside the AppImage, `.deb`, `.rpm`
-  and Flatpak.
-- **Trackpad navigation** (two-finger pan, pinch zoom), a fillet option that shrinks a radius too
-  big for its edges, cleaner dialogs and toolbar panels, and the unfinished Generative Design
-  workspace is gone.
-- Many modelling fixes: extrude/revolve in moved components, To Object picks, very flat arcs,
-  touching lines and arcs in booleans, and `solidcraft-cli run` now fails when a feature fails.
+**Upgrading from 0.7 or earlier.** 0.8 changed the Linux app ID to `ai.storyteller.solidcraft`:
+`flatpak update` offers to replace the old app, and the `.deb`, `.rpm` and AppImage remove the old
+menu entry.
 
-**New file format.** Save and Save As now write `.solidcraft` designs as a zip container
-that stores imported STEP, mesh and image data as binary, once each, at full precision, so
-designs with imports save and open faster. What that means for you:
-- Your existing `.solidcraft` and `.solvecraft` files (plain JSON) still open as before; the
-  format is detected from the contents.
-- Want plain JSON (for diffs or scripts)? Use **File ▸ Save As JSON…**, or pick a
-  `.json` name in Save As; later saves keep JSON. **File ▸ Export Design as JSON…** writes a
-  separate JSON copy. From the CLI, `solidcraft-cli run … --save design.json`; from MCP or
-  scripts, pass `"format": "json"` to `save` / `file.save`.
-- SolidCraft 0.5 and older can't open designs saved by 0.6, as a container or as JSON (the
-  JSON format tag is now `solidcraft/14`). Keep a copy of a file you may still open in 0.5.
+**Upgrading from 0.5 or earlier.** 0.6 renamed SolveCraft to SolidCraft and made the zip
+container the default save format. `.solvecraft` designs, old settings folders and
+`SOLVECRAFT_*` variables are still picked up, and `solvecraft-cli` still forwards to
+`solidcraft-cli`. Want plain JSON? Use **File ▸ Save As JSON…** or `--save design.json`. On
+macOS, replace `SolveCraft.app` with `SolidCraft.app`. Details:
+[compatibility notes](https://github.com/bherbruck/solidcraft/blob/main/docs/compatibility.md).
 
-**Renamed to SolidCraft.** Everything now uses the new name: the `solidcraft` and
-`solidcraft-cli` programs, `.solidcraft` designs, `SOLIDCRAFT_*` environment variables,
-settings folders, package names and the `solidcraft` MCP server. Upgrading from SolveCraft:
-- `.solvecraft` designs still open (double-click, Open, drag-drop, the CLI and MCP); new saves
-  are `.solidcraft`.
-- Settings, preferences and recovery files are copied to the new folders on first launch; the
-  old folders are left in place. `SOLVECRAFT_*` environment variables are still read.
-- `solvecraft-cli` remains as a deprecated alias for one release; it forwards to
-  `solidcraft-cli` and prints a note. Agents: `claude mcp add solidcraft -- solidcraft-cli mcp`;
-  an existing `claude mcp add solvecraft -- solvecraft-cli mcp` setup keeps working.
-- Windows: the `.msi` upgrades the existing installation in place (now in
-  `Program Files\SolidCraft`). Linux: the `solidcraft` `.deb`/`.rpm` replaces the `solvecraft`
-  package. The Flatpak app ID stays `ai.storyteller.solvecraft`, so `flatpak update` just works,
-  and existing AppImages find the update.
-- macOS: quit the app, move the old `SolveCraft.app` to the Trash (your designs and settings
-  stay), then drag `SolidCraft.app` from the DMG onto Applications and pin it in the Dock.
-- Details: [compatibility notes](https://github.com/bherbruck/solidcraft/blob/main/docs/compatibility.md).
-
-Documentation, the browser app and the Flatpak feed use the SolidCraft project Pages URLs;
-old-name Pages addresses are not permanent aliases.
+Documentation, the browser app and the Flatpak feed use the SolidCraft project Pages URLs.
 
 **Which file?**
 - **Windows:** `SolidCraft-{version}-windows-x64.exe` runs as is. Or install the `.msi`, or unzip the
@@ -77,18 +41,24 @@ installing SolidCraft; keep both remotes in the same user installation:
 
 ```sh
 flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
-flatpak remote-add --user --if-not-exists solidcraft https://bherbruck.github.io/solidcraft/flatpak/solidcraft.flatpakrepo
-flatpak install --user solidcraft ai.storyteller.solvecraft
-flatpak run ai.storyteller.solvecraft
+flatpak remote-add --user --if-not-exists solidcraft https://docs.solidcraft.io/flatpak/solidcraft.flatpakrepo
+flatpak install --user solidcraft ai.storyteller.solidcraft
+flatpak run ai.storyteller.solidcraft
 ```
 
+A remote added from the old `bherbruck.github.io` address no longer finds updates: run
+`flatpak remote-modify --user --url=https://docs.solidcraft.io/flatpak/repo/ solidcraft`, then
+`flatpak update --user`.
+
+Flatpak installs from 0.7 or earlier use the old ID `ai.storyteller.solvecraft`: `flatpak update --user`
+offers to replace it with `ai.storyteller.solidcraft`, and settings move along.
+
 Single-file `.flatpak` bundles include the runtime repository address; missing runtimes
-still need an internet connection. [Linux installation details](https://bherbruck.github.io/solidcraft/guide/getting-started.html#linux-flatpak).
+still need an internet connection. [Linux installation details](https://docs.solidcraft.io/guide/getting-started.html#linux-flatpak).
 
 The builds aren't signed yet. On macOS, right-click `SolidCraft.app` in Applications and choose
 **Open** the first time (or run `xattr -dr com.apple.quarantine /Applications/SolidCraft.app`).
 On Windows, SmartScreen may say "Windows protected your PC": **More info**, then **Run anyway**.
 Licences are built in (Help ▸ About ▸ Licences, `solidcraft-cli licences`); the packages also
-install `THIRD-PARTY-LICENSES.txt`. Known limitations:
-[ROADMAP.md](https://github.com/bherbruck/solidcraft/blob/main/ROADMAP.md#known-limitations).
+install `THIRD-PARTY-LICENSES.txt`.
 

.github/workflows/ci.yml

@@ -1,11 +1,53 @@
 # Fast checks always run; native builds run for code/CI changes.
-# Tests are built once and run in 4 shards. A few heavy tests (see .config/nextest.toml) are
-# skipped on pull requests and run on pushes to main and nightly.
+# PRs test what they touch; main and nightly test everything. On a pull request the "Select
+# checks" job maps the changed files to workspace packages (scripts/ci/affected.py), adds the
+# packages that depend on them, and Clippy, the test archive and the test shards cover only
+# those. Test data under tests/, vendored crates under vendor/ and root files a crate embeds
+# select the packages that read them. Changes to the lockfile, root manifest,
+# toolchain/cargo/nextest config, this workflow, scripts/ or any file no package owns select the
+# whole workspace, as do pushes to main that change code, the nightly run and Run workflow.
+# Documentation, packaging, the other workflows and the GitHub bots' scripts select nothing:
+# no native job runs for them, on pull requests or on main.
+# Tests are built once and run in shards. A few heavy tests (see .config/nextest.toml) are
+# skipped on pull requests and run on pushes to main and nightly. The Windows jobs (D3D12 shaders
+# and app startup), the reference tests and the doc tests run on main and nightly only, not on
+# pull requests (the fast lane, in Select checks); a break there is fixed forward on main. Only
+# main saves the build caches; pull requests restore them. On pull requests the test build and the
+# shards start only after the format and repository checks pass.
+# A push to main runs only the repository checks when a passing merge-queue run tested that very
+# commit, or when nothing a build reads changed since the last push to main whose run passed.
+# Otherwise it runs everything.
+# Heavy checks wait for review: a pull request without the `approved-for-ci` label runs only
+# Select checks, the format and repository checks and a quick compile. Adding the label (after
+# review) runs everything above, and every later push to the PR does too, except a push that only
+# merges main into a change that already passed (scripts/ci/main_merge.py): it carries that
+# result and runs the repository checks. Merge groups, the nightly run and Run workflow are not
+# pull requests and always run the full suite.
+# GitHub cannot filter `labeled` events by label name, so any other label starts a run whose jobs
+# are all skipped; it gets its own concurrency group (below) so it never cancels the real run. Its
+# `ci` job still runs and reports the commit's real result (see the `ci` job): the merge queue
+# reads `ci` from the newest run of a commit, so a run without it would block a PR that passed.
 # Cross-compilation is opt-in through Run workflow; release builds remain in release.yml.
+# Every Linux job runs on Blacksmith's Ubuntu 24.04 runners (blacksmith-<N>vcpu-ubuntu-2404), sized
+# per job: 16 vCPU for Build tests, Clippy and the merge queue's test shards, 8 for compiles, the
+# other test shards, doc and reference tests, 4 for the light checks, 2 for Select checks and ci.
+# The Windows shader job runs on Blacksmith's Windows Server 2025 runners (blacksmith-8vcpu-windows-2025);
+# the Windows app startup smoke stays on windows-latest, which has a desktop session that presents frames.
+# Pull requests, forks included, the merge queue, pushes to main and the nightly run all use them:
+# the runners are ephemeral, fork runs get no secrets, and main saves the build caches that every
+# other run restores read-only. The tests are built once (Build tests) into an archive the shards
+# run; Blacksmith's image matches ubuntu-24.04, so the archive and the recorded goldens behave the
+# same.
 name: CI
 
 on:
+  # Draft pull requests run no CI (see `changes`, `checks` and `ci`): it starts when the PR is
+  # marked ready for review, and on every push after that. `labeled` is there for approved-for-ci
+  # only (other labels are skipped, see the top of this file).
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review, labeled]
+  # The merge queue: each queued group runs the full suite before it lands on main.
+  merge_group:
   push:
     branches: [main]
   schedule:
@@ -21,19 +63,54 @@ permissions:
   contents: read
 
 concurrency:
-  group: ci-${{ github.ref }}
-  # Every push to main gets its full run; a new PR push replaces the old run.
+  # A new PR push replaces the old run. Only one run per group may wait, so a busy main would
+  # cancel the waiting nightly (or a Run workflow) before it starts: they get groups of their own.
+  # A `labeled` event for any label but approved-for-ci does no work and must not cancel (or queue
+  # behind) the PR's real run, so it gets a group of its own; approved-for-ci replaces the
+  # unlabelled run with the full one.
+  group: ci-${{ github.event_name }}-${{ github.ref }}${{ github.event.action == 'labeled' && github.event.label.name != 'approved-for-ci' && format('-ignored-{0}', github.run_id) || '' }}
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
+  dependency-advisories:
+    name: Dependency advisories
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Install advisory scanner
+        run: cargo install cargo-deny --version 0.20.2 --locked
+      - name: Check locked dependencies
+        run: cargo deny --locked check --warn unmaintained advisories bans sources
+
   changes:
     name: Select checks
-    runs-on: ubuntu-24.04
+    # Not on a draft: every other check needs this one, so they skip too. Not on a label other than
+    # approved-for-ci either (the same skip, for the same reason).
+    if: (github.event_name != 'pull_request' || !github.event.pull_request.draft) && (github.event.action != 'labeled' || github.event.label.name == 'approved-for-ci')
+    runs-on: blacksmith-2vcpu-ubuntu-2404
+    permissions:
+      contents: read
+      # To ask whether the merge queue already tested a commit pushed to main.
+      actions: read
     outputs:
       native: ${{ steps.paths.outputs.native }}
+      kernel: ${{ steps.paths.outputs.kernel }}
+      goldens: ${{ steps.paths.outputs.goldens }}
+      windows: ${{ steps.paths.outputs.windows }}
+      full: ${{ steps.paths.outputs.full }}
+      # Code changed on a pull request that has no approved-for-ci label yet: only Quick compile.
+      quick: ${{ steps.paths.outputs.quick }}
+      packages: ${{ steps.paths.outputs.packages }}
+      oracle: ${{ steps.paths.outputs.oracle }}
+      doctests: ${{ steps.paths.outputs.doctests }}
+      # The passing run a merge of main carries forward (its URL), when this push is only that.
+      carried: ${{ steps.paths.outputs.carried }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
@@ -44,67 +121,231 @@ jobs:
           EVENT_NAME: ${{ github.event_name }}
           BASE_SHA: ${{ github.event.pull_request.base.sha }}
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          PUSH_SHA: ${{ github.sha }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
+          HEAD_REF: ${{ github.event.pull_request.head.ref }}
+          REPO: ${{ github.repository }}
+          APPROVED: ${{ contains(github.event.pull_request.labels.*.name, 'approved-for-ci') }}
+          GH_TOKEN: ${{ github.token }}
         run: |
           native=false
-          if [ "$EVENT_NAME" != pull_request ]; then
+          kernel=false
+          goldens=false
+          windows=false
+          full=true
+          packages=
+          # Whether the NUL-separated paths in $1 reach any code: scripts/ci/affected.py selects
+          # something or the whole workspace. Documentation, packaging, other workflows and the bots'
+          # scripts select nothing. Pull requests and pushes to main share it.
+          select_packages() {
+            python3 -I scripts/ci/affected.py --paths "$1" > "$RUNNER_TEMP/ci-affected"
+            cat "$RUNNER_TEMP/ci-affected"
+            full=$(sed -n 's/^full=//p' "$RUNNER_TEMP/ci-affected")
+            packages=$(sed -n 's/^packages=//p' "$RUNNER_TEMP/ci-affected")
+          }
+          if [ "$EVENT_NAME" = push ]; then
+            # The queue lands the very commit its merge_group run tested. If that run passed,
+            # testing the push again proves nothing new; otherwise (a merge that skipped the
+            # queue, or the API cannot answer) test everything.
+            # The API through curl and grep, which every runner image has.
+            tested=$(curl -fsS -H "Authorization: Bearer $GH_TOKEN" -H "Accept: application/vnd.github+json" \
+              "https://api.github.com/repos/$REPO/actions/workflows/ci.yml/runs?event=merge_group&head_sha=$PUSH_SHA&status=success&per_page=1" \
+              | grep -o '"total_count": *[0-9]*' | grep -o '[0-9]*$' || echo 0)
+            if [ "${tested:-0}" -gt 0 ]; then
+              echo "The merge queue already tested $PUSH_SHA: repository checks only."
+            elif tested=$(curl -fsS -H "Authorization: Bearer $GH_TOKEN" -H "Accept: application/vnd.github+json" \
+                "https://api.github.com/repos/$REPO/actions/workflows/ci.yml/runs?event=push&branch=main&status=success&per_page=1" \
+                | grep -o '"head_sha": *"[0-9a-f]*"' | head -n 1 | grep -o '[0-9a-f]\{40\}') \
+              && [ -n "$tested" ] && git merge-base --is-ancestor "$tested" "$PUSH_SHA" \
+              && git diff --no-renames --name-only -z "$tested" "$PUSH_SHA" > "$RUNNER_TEMP/ci-paths" \
+              && select_packages "$RUNNER_TEMP/ci-paths" && [ "$full" != true ] && [ -z "$packages" ]; then
+              # Nothing a build reads changed since the last push to main whose run passed (the
+              # push before may never have run: a newer push cancels a waiting one).
+              echo "$tested..$PUSH_SHA changes no code: repository checks only."
+            else
+              # Code changed (or the push can't be compared): main runs everything.
+              full=true
+              packages=
+              native=true
+              windows=true
+            fi
+          elif [ "$EVENT_NAME" != pull_request ]; then
             native=true
+            windows=true
           else
             # Compare both old and new paths of renames; unknown paths run native checks.
             git diff --no-renames --name-only -z "$BASE_SHA...$HEAD_SHA" > "$RUNNER_TEMP/ci-paths"
             while IFS= read -r -d '' path; do
+              case "$path" in crates/kernel/*|vendor/truck-*) kernel=true ;; esac
+              # What can change a robustness golden: the kernel and the crates a design is built with.
               case "$path" in
-                .github/workflows/ci.yml) native=true ;;
-                *.rs|Cargo.toml|Cargo.lock|*/Cargo.toml|.cargo/*|rust-toolchain*) native=true ;;
-                docs/*|*.md|.github/*|packaging/*|LICENSE*|NOTICE|THIRD-PARTY-LICENSES.txt) ;;
-                *) native=true ;;
+                crates/kernel/*|crates/engine/*|crates/doc/*|crates/sketch/*|crates/geom/*|vendor/truck-*|tests/robustness/*) goldens=true ;;
+              esac
+              # What the Windows D3D12 jobs exercise: the GPU crate and its shaders, the app and
+              # its startup, the viewport's wgpu glue, the vendored egui-wgpu, their scripts.
+              case "$path" in
+                crates/gpu/*|apps/solidcraft/*|crates/ui-egui/src/gpu.rs|vendor/egui-wgpu/*) windows=true ;;
+                tools/windows-*.ps1|.github/workflows/ci.yml|rust-toolchain*|.cargo/*) windows=true ;;
               esac
             done < "$RUNNER_TEMP/ci-paths"
+            # A lockfile change that moves the graphics stack (wgpu, naga, egui, winit, windows).
+            if [ "$windows" = false ] && grep -qxz 'Cargo.lock' "$RUNNER_TEMP/ci-paths" \
+              && git diff "$BASE_SHA...$HEAD_SHA" -- Cargo.lock \
+                | grep -Eq '^[ +-]name = "(wgpu[a-z_-]*|naga|egui[a-z_-]*|eframe|winit|windows[a-z_-]*|d3d12)"'; then
+              windows=true
+            fi
+            # Pull requests build and test the touched packages and their dependents; nothing
+            # selected means no code changed.
+            select_packages "$RUNNER_TEMP/ci-paths"
+            if [ "$full" = true ] || [ -n "$packages" ]; then native=true; fi
+            # The goldens are solidcraft-engine tests: its tests must be in the archive.
+            if [ "$goldens" = true ] && [ "$full" != true ]; then
+              case " $packages " in *" solidcraft-engine "*) ;; *) packages="$packages solidcraft-engine" ;; esac
+            fi
           fi
-          echo "native=$native" >> "$GITHUB_OUTPUT"
+          # The reference tests replay recipes through solidcraft-cli: needed when it, or anything
+          # it depends on, is selected.
+          oracle=$native
+          if [ "$EVENT_NAME" = pull_request ] && [ "$full" != true ]; then
+            case " $packages " in *" solidcraft-cli "*) ;; *) oracle=false ;; esac
+          fi
+          # The pull request fast lane: Windows, the reference tests and the doc tests run on main
+          # (and the nightly), not on every pull request push; a break there is fixed forward on
+          # main. Over three days of pull requests the doc tests were the only failing job 3 times
+          # in about 7,900 runner-minutes, and the reference tests never were.
+          doctests=$native
+          if [ "$EVENT_NAME" = pull_request ]; then windows=false; oracle=false; doctests=false; fi
+          # Until a maintainer adds approved-for-ci, a pull request gets a quick compile instead of
+          # Clippy, the tests, the doc tests and the goldens.
+          quick=false
+          if [ "$EVENT_NAME" = pull_request ] && [ "$APPROVED" != true ]; then
+            quick=$native
+            native=false
+            oracle=false
+            goldens=false
+          fi
+          # A push that only merges main into the change (Merge branch 'main', Update branch) when
+          # the change itself already passed: nothing new to test here, and main tests the merged
+          # result after it lands. Over three days, 872 of 1,241 such merges brought in nothing that
+          # touched the pull request's files, and each restarted the whole run.
+          carried=
+          if [ "$EVENT_NAME" = pull_request ] && [ "$native" = true ]; then
+            carried=$(python3 -I scripts/ci/main_merge.py --base "$BASE_SHA" --head "$HEAD_SHA" --repo "$REPO" \
+              --pr "$PR_NUMBER" --head-repo "$HEAD_REPO" --head-ref "$HEAD_REF" | sed -n 's/^carried=//p')
+            if [ -n "$carried" ]; then
+              echo "Only a merge of main into a change that passed in $carried: repository checks only."
+              native=false
+              goldens=false
+            fi
+          fi
+          {
+            echo "native=$native"
+            echo "kernel=$kernel"
+            echo "goldens=$goldens"
+            echo "windows=$windows"
+            echo "oracle=$oracle"
+            echo "doctests=$doctests"
+            echo "carried=$carried"
+            echo "full=$full"
+            echo "quick=$quick"
+            echo "packages=$packages"
+          } >> "$GITHUB_OUTPUT"
 
   checks:
     name: Format and repository checks
-    runs-on: ubuntu-24.04
+    if: (github.event_name != 'pull_request' || !github.event.pull_request.draft) && (github.event.action != 'labeled' || github.event.label.name == 'approved-for-ci')
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt
+      # Main saves the cache; every other run restores it, read-only.
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: repo-checks
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Format
         run: cargo fmt --all -- --check
       - name: Asset attribution
         run: cargo xtask assets
+      - name: UI icon standards and review tool
+        run: cargo xtask icons
       - name: Licences
         run: cargo xtask licences --check
       - name: Dependency layers
         run: cargo xtask layers
+      - name: Sorted lists
+        run: cargo xtask lists
+      - name: Design format pending changes
+        run: bash scripts/test-format-pending.sh
+      - name: Web app offline use and updates (headless Chrome)
+        run: cargo xtask web-offline-test
+      - name: Affected-package selection self-test
+        run: python3 -I scripts/ci/test_affected.py
+      - name: Merge-of-main detection self-test
+        run: python3 -I scripts/ci/test_main_merge.py
+      - name: Claim and triage bot tests
+        run: node --test scripts/claim/*.test.js scripts/triage/*.test.js
+
+  # Fast feedback for a pull request that has not been approved for the full CI yet.
+  quick-compile:
+    name: Quick compile
+    needs: changes
+    if: needs.changes.outputs.quick == 'true'
+    runs-on: blacksmith-8vcpu-ubuntu-2404
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Size parallel compiles to the job's memory
+        run: scripts/ci/build-jobs.sh
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: quick-compile
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Cargo check
+        run: cargo check --workspace --all-targets --locked
 
   clippy:
     name: Native Linux Clippy
     needs: changes
     if: needs.changes.outputs.native == 'true'
-    runs-on: ubuntu-24.04
+    runs-on: blacksmith-16vcpu-ubuntu-2404
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
+      # Main saves the cache; every other run restores it, read-only.
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: native-clippy
-      - run: cargo clippy --workspace --all-targets --profile ci --locked -- -D warnings
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Clippy
+        env:
+          FULL: ${{ needs.changes.outputs.full }}
+          PACKAGES: ${{ needs.changes.outputs.packages }}
+        run: |
+          # Pull requests lint the affected packages (scripts/ci/affected.py); everything else, all.
+          scope=(--workspace)
+          if [ "$FULL" != true ]; then scope=(); for p in $PACKAGES; do scope+=(-p "$p"); done; fi
+          cargo clippy "${scope[@]}" --all-targets --profile ci --locked -- -D warnings
 
   build-tests:
     name: Build tests
-    needs: changes
-    if: needs.changes.outputs.native == 'true'
-    runs-on: ubuntu-24.04
-    timeout-minutes: 45
+    # Fail fast on pull requests: the test archive (and so the shards) waits for the repository
+    # checks, the most common cheap failure; heavy jobs used to run on to the end beside a failed
+    # format check. Main, nightly and Run workflow build regardless, so the action matrix and the
+    # property tests that hang off this job keep their signal.
+    needs: [changes, checks]
+    if: ${{ !cancelled() && needs.changes.result == 'success' && needs.changes.outputs.native == 'true' && (github.event_name != 'pull_request' || needs.checks.result == 'success') }}
+    runs-on: blacksmith-16vcpu-ubuntu-2404
+    # Fork builds start from main's cache, read-only; give them room to finish and upload.
+    timeout-minutes: ${{ (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) && 60 || 45 }}
     env:
       CARGO_INCREMENTAL: "0"
       RUSTC_WRAPPER: sccache
@@ -112,10 +353,13 @@ jobs:
       SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Size parallel compiles to the job's memory
+        run: scripts/ci/build-jobs.sh
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: native-tests
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Set up compiler cache
         uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
         with:
@@ -124,7 +368,14 @@ jobs:
         with:
           tool: cargo-nextest
       - name: Compile tests into a nextest archive
-        run: cargo nextest archive --workspace --cargo-profile ci --locked --archive-file tests.tar.zst
+        env:
+          FULL: ${{ needs.changes.outputs.full }}
+          PACKAGES: ${{ needs.changes.outputs.packages }}
+        run: |
+          # Pull requests archive only the affected packages (scripts/ci/affected.py).
+          scope=(--workspace)
+          if [ "$FULL" != true ]; then scope=(); for p in $PACKAGES; do scope+=(-p "$p"); done; fi
+          cargo nextest archive "${scope[@]}" --cargo-profile ci --locked --archive-file tests.tar.zst
       - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: nextest-archive
@@ -137,13 +388,91 @@ jobs:
 
   tests:
     name: Native Linux tests (${{ matrix.shard }}/4)
-    needs: build-tests
-    runs-on: ubuntu-24.04
+    needs: [changes, checks, build-tests]
+    if: ${{ !cancelled() && needs.changes.outputs.native == 'true' && (github.event_name != 'pull_request' || needs.checks.result == 'success') && needs.build-tests.result == 'success' }}
+    runs-on: ${{ github.event_name == 'merge_group' && 'blacksmith-16vcpu-ubuntu-2404' || 'blacksmith-8vcpu-ubuntu-2404' }}
     timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
-        shard: [1, 2, 3, 4]
+        # Pull requests test their affected crates in 2 shards; main and the nightly use 4.
+        shard: ${{ fromJSON(github.event_name == 'pull_request' && '[1, 2]' || '[1, 2, 3, 4]') }}
+    env:
+      # Pictures (snapshots, screenshots, ui.render, the viewport's offscreen tests) are drawn on
+      # the GPU. The runner has none: Mesa's lavapipe (software Vulkan) draws them, and a test that
+      # would skip for want of an adapter fails instead.
+      SOLIDCRAFT_GPU: software
+      SOLIDCRAFT_REQUIRE_GPU: "1"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Install a software Vulkan driver (lavapipe)
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends mesa-vulkan-drivers libvulkan1
+      - uses: taiki-e/install-action@1168f6810a3cb30a3514bf5756a3b7f0422c6df8 # v2.87.28
+        with:
+          tool: cargo-nextest
+      # Each shard runs the archive the Build tests job made.
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: nextest-archive
+      - name: Run tests
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          GOLDENS: ${{ needs.changes.outputs.goldens }}
+          SHARD: ${{ matrix.shard }}
+          SHARDS: ${{ github.event_name == 'pull_request' && 2 || 4 }}
+          # The robustness golden seeds a pull request skips: each takes one to twenty minutes under
+          # CI load, together about four fifths of the goldens' time. Pushes to main, the merge
+          # queue and the nightly run every seed.
+          SLOW_SEEDS: 81|45|20|24|95|02|57|40|18|48|32|46|85|61|77|34|14
+        run: |
+          # Pull requests skip the heavy tests (default-filter in .config/nextest.toml).
+          filter=()
+          if [ "$EVENT_NAME" != pull_request ]; then
+            # The boolean property tests draw new random inputs every run; they run only in the
+            # nightly property-tests job, so a known kernel bug cannot turn main red at random.
+            filter=(--ignore-default-filter -E 'not (package(solidcraft-kernel) & binary(boolean_props))')
+          elif [ "$GOLDENS" = true ]; then
+            # A pull request that can change a robustness golden (tests/robustness/goldens.json)
+            # also checks every seed but the slow ones, in the same run so they share its cores.
+            filter=(--ignore-default-filter -E "default() | (package(solidcraft-engine) & test(/^tests::robustness_goldens::/) & not test(/^tests::robustness_goldens::seed_($SLOW_SEEDS)\$/))")
+          fi
+          junit=${CARGO_TARGET_DIR:-target}/nextest/ci/junit.xml
+          rm -f "$junit"
+          # Extract into ./target: tests that run a built binary (env!("CARGO_BIN_EXE_*")) have
+          # the build job's path, which is the same checkout path here.
+          run=(cargo nextest run --archive-file tests.tar.zst --workspace-remap . --extract-to . --extract-overwrite)
+          if ! "${run[@]}" --profile ci --partition "slice:$SHARD/$SHARDS" --no-tests=pass "${filter[@]}"; then
+            # A failed golden gets the hint to re-record it (junit.xml lists the failures).
+            if [ -f "$junit" ] && tr '\n' ' ' < "$junit" | grep -q '<testcase name="tests::robustness_goldens::[^"]*"[^>]*>[[:space:]]*<failure'; then
+              echo "::error::A robustness golden changed. If the new result is intended, re-record it in this pull request and say why:"
+              echo "::error::ROBUSTNESS_GOLDENS_BLESS=\"why it changed\" cargo test --profile ci -p solidcraft-engine --lib robustness_goldens::   (see docs/robustness.md)"
+            fi
+            exit 1
+          fi
+      - name: Upload test timings
+        if: always()
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: junit-${{ matrix.shard }}
+          path: ${{ env.CARGO_TARGET_DIR || 'target' }}/nextest/ci/junit.xml
+          retention-days: 7
+
+  action-matrix:
+    # Every ordinary action on every face, edge, vertex and body of the design corpus, against
+    # tests/action_matrix/baseline.json (docs/action-matrix.md). Every test run checks a sample;
+    # the whole matrix runs nightly (or by hand) in shards of about equal cost, cut by
+    # tests/action_matrix/costs.json. Keep SHARDS in step with the matrix below.
+    name: Action matrix (${{ matrix.shard }}/16)
+    needs: build-tests
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 55
+    strategy:
+      fail-fast: false
+      matrix:
+        shard: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: taiki-e/install-action@1168f6810a3cb30a3514bf5756a3b7f0422c6df8 # v2.87.28
@@ -152,31 +481,81 @@ jobs:
       - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
         with:
           name: nextest-archive
-      - name: Run tests
+      - name: Run one shard of the matrix
+        # A step limit below the job's, so the outcomes so far are still uploaded.
+        timeout-minutes: 45
         env:
-          EVENT_NAME: ${{ github.event_name }}
+          SHARDS: 16
           SHARD: ${{ matrix.shard }}
+          OUT: ${{ github.workspace }}/action-matrix
         run: |
-          # Pull requests skip the heavy tests (default-filter in .config/nextest.toml).
-          all=()
-          if [ "$EVENT_NAME" != pull_request ]; then all=(--ignore-default-filter); fi
-          # Extract into ./target: tests that run a built binary (env!("CARGO_BIN_EXE_*")) have
-          # the build job's path, which is the same checkout path here.
+          mkdir -p "$OUT"
+          export ACTION_MATRIX_SHARD="$SHARD/$SHARDS" ACTION_MATRIX_RESULTS="$OUT/results-$SHARD.json" \
+            ACTION_MATRIX_TIMINGS="$OUT/timings-$SHARD.jsonl" ACTION_MATRIX_WORKDIR="$OUT/raw-$SHARD"
           cargo nextest run --archive-file tests.tar.zst --workspace-remap . --extract-to . --extract-overwrite \
-            --profile ci --partition "slice:$SHARD/4" "${all[@]}"
-      - name: Upload test timings
+            --profile ci --success-output final --run-ignored only -E "binary(action_matrix) & test(=action_matrix_shard)"
+      - name: Upload the outcomes and timings
+        # `cargo xtask action-matrix --from DIR --bless` (with every shard's files in DIR)
+        # records them in the baseline and costs.json.
         if: always()
         uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
-          name: junit-${{ matrix.shard }}
-          path: target/nextest/ci/junit.xml
-          retention-days: 7
+          name: action-matrix-${{ matrix.shard }}
+          path: action-matrix
+          retention-days: 14
+
+  action-matrix-determinism:
+    # A sample of the matrix run twice on one runner: every action must come out the same.
+    name: Action matrix determinism
+    needs: build-tests
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: taiki-e/install-action@1168f6810a3cb30a3514bf5756a3b7f0422c6df8 # v2.87.28
+        with:
+          tool: cargo-nextest
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: nextest-archive
+      - name: Run a sample twice
+        run: |
+          cargo nextest run --archive-file tests.tar.zst --workspace-remap . --extract-to . --extract-overwrite \
+            --profile ci --success-output final --run-ignored only -E "binary(action_matrix) & test(=action_matrix_determinism)"
+
+  property-tests:
+    # The boolean property tests and the atomic command tests with many cases. Pull requests skip
+    # them (.config/nextest.toml); pushes to main run atomic_commands with small defaults (seeds
+    # 0..4) and skip boolean_props, whose random inputs would fail main at random.
+    name: Property tests (many cases)
+    needs: build-tests
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: taiki-e/install-action@1168f6810a3cb30a3514bf5756a3b7f0422c6df8 # v2.87.28
+        with:
+          tool: cargo-nextest
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: nextest-archive
+      - name: Boolean properties and atomic commands
+        # The defaults (8 cases, seeds 0..4) take 159 s and 802 s on a 2-core VM; four times the
+        # cases and twice the seeds are estimated at about 40 minutes there (not yet timed on CI).
+        env:
+          PROPTEST_CASES: "32"
+          ATOMIC_SEEDS: "0..8"
+        run: |
+          cargo nextest run --archive-file tests.tar.zst --workspace-remap . --extract-to . --extract-overwrite \
+            --profile ci --ignore-default-filter --success-output final -E "binary(boolean_props) | binary(atomic_commands)"
 
   doc-tests:
     name: Doc tests
     needs: changes
-    if: needs.changes.outputs.native == 'true'
-    runs-on: ubuntu-24.04
+    if: needs.changes.outputs.doctests == 'true'
+    runs-on: blacksmith-8vcpu-ubuntu-2404
     timeout-minutes: 45
     env:
       CARGO_INCREMENTAL: "0"
@@ -185,22 +564,46 @@ jobs:
       SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Size parallel compiles to the job's memory
+        run: scripts/ci/build-jobs.sh
       - uses: dtolnay/rust-toolchain@stable
+      # Main saves the cache; every other run restores it, read-only.
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: doc-tests
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Set up compiler cache
         uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
         with:
           version: v0.16.0
       # nextest does not run doc tests.
-      - run: cargo test --workspace --profile ci --locked --doc
+      - name: Doc tests
+        env:
+          FULL: ${{ needs.changes.outputs.full }}
+          PACKAGES: ${{ needs.changes.outputs.packages }}
+        run: |
+          # Pull requests test the affected packages that have a library (only libraries have doc
+          # tests); everything else, the whole workspace.
+          scope=(--workspace)
+          if [ "$FULL" != true ]; then
+            scope=()
+            libs=$(cargo metadata --no-deps --format-version 1 --locked \
+              | python3 -I -c 'import json, sys; print(" ".join(p["name"] for p in json.load(sys.stdin)["packages"] if any("lib" in t["kind"] for t in p["targets"])))')
+            for p in $PACKAGES; do
+              case " $libs " in *" $p "*) scope+=(-p "$p") ;; esac
+            done
+          fi
+          if [ ${#scope[@]} -eq 0 ]; then
+            echo "No affected package has a library: no doc tests to run."
+            exit 0
+          fi
+          cargo test "${scope[@]}" --profile ci --locked --doc
 
   oracle:
     name: Reference tests
     needs: changes
-    if: needs.changes.outputs.native == 'true'
-    runs-on: ubuntu-24.04
+    if: needs.changes.outputs.oracle == 'true'
+    runs-on: blacksmith-8vcpu-ubuntu-2404
     timeout-minutes: 60
     env:
       CARGO_INCREMENTAL: "0"
@@ -209,10 +612,14 @@ jobs:
       SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Size parallel compiles to the job's memory
+        run: scripts/ci/build-jobs.sh
       - uses: dtolnay/rust-toolchain@stable
+      # Main saves the cache; every other run restores it, read-only.
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: oracle
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Set up compiler cache
         uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
         with:
@@ -220,7 +627,7 @@ jobs:
       - name: Build the command line
         run: cargo build -p solidcraft-cli --profile ci --locked
       - name: Replay tests/oracle and compare with expected.json
-        run: cargo xtask oracle --cli target/ci/solidcraft-cli
+        run: cargo xtask oracle --cli "${CARGO_TARGET_DIR:-target}/ci/solidcraft-cli"
       - name: Upload the report
         if: always()
         uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
@@ -228,37 +635,155 @@ jobs:
           name: oracle-report
           path: docs/oracle.md
 
+  # D3D12's older shader compiler (FXC, used where dxcompiler.dll is absent) is stricter than
+  # DXC, Vulkan and Metal: a shader it cannot compile once crashed the app at startup. Build the
+  # GPU tessellation pipeline with FXC on the runner's WARP software adapter and compare its
+  # results with the CPU, and draw headless pictures with the viewport's pipelines there
+  # (crates/gpu/tests/capture.rs).
+  windows-fxc:
+    name: Windows D3D12 FXC shaders
+    needs: changes
+    if: needs.changes.outputs.windows == 'true'
+    runs-on: blacksmith-8vcpu-windows-2025
+    timeout-minutes: 45
+    env:
+      WGPU_BACKEND: dx12
+      WGPU_DX12_COMPILER: fxc
+      # WARP is a software (Cpu) adapter.
+      SOLIDCRAFT_GPU: software
+      SOLIDCRAFT_REQUIRE_GPU: "1"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: windows-fxc
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      # One test at a time: WARP's shader JIT crashes now and then (a null read in
+      # d3d10warp.dll's JIT optimizer, about 1 run in 60) when several devices compile compute
+      # pipelines at once, which the parallel tests do. Minidumps showed it in WARP itself, not
+      # in SolidCraft or FXC; serial runs never hit it.
+      - run: cargo test -p solidcraft-gpu --profile ci --locked -- --test-threads=1
+
+  # The Windows app starts D3D12 first and only the backend it uses (a Vulkan driver crashed the
+  # app at startup on Intel). Start the real app on the runner (its D3D12 adapter is WARP) with
+  # several saved settings and safe mode, and check each draws a frame and quits cleanly.
+  windows-startup:
+    name: Windows app startup
+    needs: changes
+    if: needs.changes.outputs.windows == 'true'
+    # GitHub-hosted: the startup smoke needs an interactive desktop that presents frames; on
+    # Blacksmith's Windows runners the window never presents ("no frame was presented").
+    runs-on: windows-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: windows-startup
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Backend order and probing on Windows
+        run: cargo test -p solidcraft --profile ci --locked -- startup::tests native_crash::tests native_frame::tests
+      - name: Build the app
+        run: cargo build -p solidcraft --profile ci --locked
+      - name: Start the app under different settings
+        shell: pwsh
+        run: tools/windows-startup-smoke.ps1 -Exe target/ci/solidcraft.exe
+      - name: Resize border from the first frame
+        shell: pwsh
+        run: tools/windows-resize-smoke.ps1 -Exe target/ci/solidcraft.exe
+
   # Preserve the existing check name for branch protection, including docs-only PRs.
   ci:
-    needs: [changes, checks, clippy, build-tests, tests, doc-tests, oracle]
-    if: always()
-    runs-on: ubuntu-24.04
+    # On a run another label starts (every other job skipped), this job reports the result of the
+    # commit's real run instead: the merge queue reads `ci` from the newest run of a commit, so a
+    # run without a passing `ci` would block a pull request that passed (#1850, #3182, #3252).
+    name: ci
+    needs: [changes, checks, quick-compile, clippy, build-tests, tests, doc-tests, oracle, windows-fxc, windows-startup]
+    if: always() && (github.event_name != 'pull_request' || !github.event.pull_request.draft)
+    runs-on: blacksmith-2vcpu-ubuntu-2404
+    permissions:
+      contents: read
+      # To read the commit's other runs of this workflow.
+      actions: read
     steps:
+      - name: Report the commit's real result (a run another label started)
+        if: github.event.action == 'labeled' && github.event.label.name != 'approved-for-ci'
+        env:
+          GH_TOKEN: ${{ github.token }}
+          REPO: ${{ github.repository }}
+          SHA: ${{ github.event.pull_request.head.sha }}
+          RUN_ID: ${{ github.run_id }}
+        run: |
+          # The other runs of ci.yml for this commit. While one is still going, wait for it (at
+          # most 90 minutes); then pass only when the newest one that ran its checks passed.
+          deadline=$((SECONDS + 5400))
+          while :; do
+            runs=$(gh api "repos/$REPO/actions/workflows/ci.yml/runs?head_sha=$SHA&event=pull_request&per_page=100" \
+              --jq "[.workflow_runs[] | select(.id != $RUN_ID)]")
+            pending=$(jq '[.[] | select(.status != "completed")] | length' <<<"$runs")
+            if [ "$pending" -eq 0 ] || [ "$SECONDS" -ge "$deadline" ]; then break; fi
+            echo "Waiting for $pending run(s) of this commit to finish."
+            sleep 30
+          done
+          # Runs with every job skipped (labels, before this job reported) are not a result.
+          latest=$(jq -r '[.[] | select(.status == "completed" and .conclusion != "skipped")]
+            | sort_by(.created_at) | last | "\(.conclusion) \(.html_url)"' <<<"$runs")
+          echo "The commit's latest run: $latest"
+          echo "A label started this run: \`ci\` repeats the commit's latest result ($latest)." >> "$GITHUB_STEP_SUMMARY"
+          test "${latest%% *}" = success
       - name: Verify required checks
+        if: github.event.action != 'labeled' || github.event.label.name == 'approved-for-ci'
         env:
           CHANGES: ${{ needs.changes.result }}
           CHECKS: ${{ needs.checks.result }}
           NATIVE: ${{ needs.changes.outputs.native }}
+          QUICK: ${{ needs.changes.outputs.quick }}
+          QUICK_COMPILE: ${{ needs.quick-compile.result }}
+          WINDOWS: ${{ needs.changes.outputs.windows }}
+          ORACLE_RUN: ${{ needs.changes.outputs.oracle }}
+          DOCTESTS: ${{ needs.changes.outputs.doctests }}
           CLIPPY: ${{ needs.clippy.result }}
           BUILD: ${{ needs.build-tests.result }}
           TESTS: ${{ needs.tests.result }}
           DOCS: ${{ needs.doc-tests.result }}
           ORACLE: ${{ needs.oracle.result }}
+          WINDOWS_FXC: ${{ needs.windows-fxc.result }}
+          WINDOWS_STARTUP: ${{ needs.windows-startup.result }}
         run: |
           test "$CHANGES" = success
           test "$CHECKS" = success
+          # An unapproved pull request: the heavy jobs are skipped on purpose.
+          if [ "$QUICK" = true ]; then
+            test "$QUICK_COMPILE" = success
+          fi
           if [ "$NATIVE" = true ]; then
             test "$CLIPPY" = success
             test "$BUILD" = success
             test "$TESTS" = success
+          fi
+          if [ "$DOCTESTS" = true ]; then
             test "$DOCS" = success
+          fi
+          if [ "$ORACLE_RUN" = true ]; then
             test "$ORACLE" = success
           fi
+          if [ "$WINDOWS" = true ]; then
+            test "$WINDOWS_FXC" = success
+            test "$WINDOWS_STARTUP" = success
+          fi
+      - name: Note a carried result
+        if: needs.changes.outputs.carried != ''
+        env:
+          CARRIED: ${{ needs.changes.outputs.carried }}
+        run: |
+          echo "This push only merges main into a change that already passed; the heavy checks were not repeated. Passing run: $CARRIED" >> "$GITHUB_STEP_SUMMARY"
 
   wasm:
     name: Compile WebAssembly (manual)
     if: github.event_name == 'workflow_dispatch' && inputs.cross_compile
-    runs-on: ubuntu-24.04
+    runs-on: blacksmith-8vcpu-ubuntu-2404
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -268,12 +793,13 @@ jobs:
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: wasm
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - run: cargo xtask wasm
 
   riscv64-gates:
     name: Compile RISC-V (manual)
     if: github.event_name == 'workflow_dispatch' && inputs.cross_compile
-    runs-on: ubuntu-24.04
+    runs-on: blacksmith-8vcpu-ubuntu-2404
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -289,6 +815,7 @@ jobs:
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: riscv64
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Install cross-compilation dependencies
         run: |
           # Ubuntu's regular archive serves amd64; RISC-V packages live in ports.
@@ -315,4 +842,4 @@ jobs:
         run: |
           . "$HOME/.cargo/env"
           export CRAFT_FONTS_DIR="$PWD/craft-fonts"
-          cargo check --all-targets --locked --target riscv64gc-unknown-linux-gnu
+          cargo check --all-targets --locked --target riscv64gc-unknown-linux-gnu

.github/workflows/claim.yml

@@ -0,0 +1,52 @@
+# `/claim` and `/unclaim` on issues (CONTRIBUTING.md, "Sending a change"), and a daily sweep that
+# frees claims nobody is working on. A pull request that references an issue (`<summary> (#N)`,
+# `Fixes #N`) claims it too. The logic is in scripts/claim/claim.js (tested in ci.yml).
+name: Claim
+
+on:
+  issue_comment:
+    types: [created]
+  # pull_request_target so PRs from forks can label and assign. It runs the base branch's
+  # scripts/claim and only reads the PR's title, body and author; the PR's code is never checked out.
+  pull_request_target:
+    types: [opened, reopened]
+  schedule:
+    - cron: '17 5 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: read # to check out scripts/claim
+  issues: write
+  pull-requests: read
+
+# One run at a time per issue, so two simultaneous /claim comments can't both win.
+concurrency:
+  group: claim-${{ github.event.issue.number || github.event.pull_request.number || 'sweep' }}
+  cancel-in-progress: false
+
+jobs:
+  claim:
+    name: Claim bot
+    runs-on: ubuntu-24.04
+    timeout-minutes: 10
+    if: >-
+      github.event_name != 'issue_comment' ||
+      (!github.event.issue.pull_request && github.event.comment.user.type != 'Bot' &&
+      (startsWith(github.event.comment.body, '/claim') || startsWith(github.event.comment.body, '/unclaim')))
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          sparse-checkout: scripts/claim
+      - uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const claim = require('./scripts/claim/claim.js');
+            if (context.eventName === 'issue_comment') {
+              await claim.handleComment({ github, context });
+            } else if (context.eventName === 'pull_request_target') {
+              const claimed = await claim.handlePull({ github, context });
+              core.info(`Claimed: ${claimed.join(', ') || 'none'}`);
+            } else {
+              const released = await claim.sweep({ github, context });
+              core.info(`Released: ${released.join(', ') || 'none'}`);
+            }

.github/workflows/docker.yml

@@ -0,0 +1,110 @@
+# The web app as a container image on GitHub's container registry, for self-hosting
+# (packaging/docker; the book's "Self-hosting with Docker"):
+#
+#   ghcr.io/<owner>/solidcraft-web:latest   the latest published release
+#   ghcr.io/<owner>/solidcraft-web:0.14.0   a release (also 0.14); pre-releases get only their version
+#   ghcr.io/<owner>/solidcraft-web:edge     main
+#
+# For linux/amd64 and linux/arm64. The site is built here, as Pages and Release build it, and
+# passed to the Dockerfile as its `site` stage. Pull requests that touch the image build and
+# smoke-test it without publishing. Releases published by an agent or maintainer trigger this;
+# the nightly pre-releases (made with GITHUB_TOKEN) do not.
+name: Docker
+
+on:
+  push:
+    branches: [main]
+    # The image holds the web app only: documentation, test data and the GitHub bots' scripts can't
+    # change it, so a push touching only those builds nothing (edge stays at the last code change).
+    # ATTRIBUTION.md is the exception among the Markdown files: the app embeds it (Help, About).
+    # The last matching pattern wins.
+    paths: ["**", "!docs/**", "!**/*.md", "ATTRIBUTION.md", "!tests/**", "!scripts/claim/**", "!scripts/triage/**"]
+  release:
+    types: [published]
+  pull_request:
+    paths: ["packaging/docker/**", ".github/workflows/docker.yml"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: docker-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+  TRUNK_VERSION: v0.21.14
+
+jobs:
+  image:
+    if: ${{ !github.event.repository.private }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: docker-web
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Install trunk
+        run: |
+          mkdir -p "$HOME/.local/bin"
+          curl -fsSL "https://github.com/trunk-rs/trunk/releases/download/${TRUNK_VERSION}/trunk-x86_64-unknown-linux-gnu.tar.gz" | tar -xz -C "$HOME/.local/bin"
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+      - name: Build the web app
+        working-directory: apps/solidcraft-web
+        run: trunk build --release
+      - name: Image name
+        id: image
+        # Registry names are lower case; a fork's owner may not be.
+        run: echo "name=ghcr.io/${GITHUB_REPOSITORY_OWNER,,}/solidcraft-web" >> "$GITHUB_OUTPUT"
+      - uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+        id: meta
+        with:
+          images: ${{ steps.image.outputs.name }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=edge,branch=main
+            type=ref,event=pr
+          labels: |
+            org.opencontainers.image.title=SolidCraft (web)
+            org.opencontainers.image.description=SolidCraft, open-source parametric CAD, in the browser: the web app served by nginx on port 8080
+            org.opencontainers.image.licenses=MIT OR Apache-2.0
+      - uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
+      - name: Build for the smoke test
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        with:
+          context: .
+          file: packaging/docker/Dockerfile
+          build-contexts: site=dist/web
+          platforms: linux/amd64
+          load: true
+          tags: solidcraft-web:test
+      - name: Smoke test
+        run: bash packaging/docker/smoke-test.sh solidcraft-web:test
+      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+        if: github.event_name != 'pull_request'
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and publish
+        if: github.event_name != 'pull_request'
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        with:
+          context: .
+          file: packaging/docker/Dockerfile
+          build-contexts: site=dist/web
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          annotations: ${{ steps.meta.outputs.annotations }}

.github/workflows/generated.yml

@@ -0,0 +1,62 @@
+# Files generated from the code are rewritten here, on main, after each merge, so pull requests
+# never edit them (two pull requests that each regenerated one would always conflict):
+# THIRD-PARTY-LICENSES.txt (`cargo xtask licences`) and docs/features.md (`cargo xtask features`).
+name: Generated files
+
+on:
+  push:
+    branches: [main]
+    # THIRD-PARTY-LICENSES.txt follows the manifests, the lockfile, the vendored crates' licence
+    # files and the fonts' licences; docs/features.md follows the command registry (crates/engine),
+    # read through solidcraft-cli. Other pushes regenerate nothing.
+    paths:
+      - "Cargo.lock"
+      - "**/Cargo.toml"
+      - "vendor/**"
+      - "assets/fonts/**"
+      - "crates/engine/**"
+      - "apps/solidcraft-cli/**"
+      - "xtask/**"
+      - ".github/workflows/generated.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+# One run at a time; a burst of merges leaves one run waiting, which sees all of them.
+concurrency:
+  group: generated-files
+  cancel-in-progress: false
+
+jobs:
+  regenerate:
+    name: Regenerate and commit
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    steps:
+      # Always main itself, never pull request code, since this job can push.
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: main
+          # main goes through the merge queue; this deploy key may push past it.
+          ssh-key: ${{ secrets.GENERATED_FILES_DEPLOY_KEY }}
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: generated-files
+      - name: THIRD-PARTY-LICENSES.txt
+        run: cargo xtask licences
+      - name: docs/features.md
+        run: cargo xtask features
+      - name: Commit if changed
+        run: |
+          if git diff --quiet -- THIRD-PARTY-LICENSES.txt docs/features.md; then echo "unchanged"; exit 0; fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add THIRD-PARTY-LICENSES.txt docs/features.md
+          git commit -m "Regenerate THIRD-PARTY-LICENSES.txt and docs/features.md [skip ci]"
+          for _ in 1 2 3; do
+            git pull --rebase origin main && git push origin HEAD:main && exit 0
+            sleep 10
+          done
+          exit 1

.github/workflows/lists.yml

@@ -0,0 +1,33 @@
+# Files many pull requests add to are kept so that additions don't conflict: one file per change
+# or one sorted line per item (CONTRIBUTING.md, "Lists many changes add to"). Fast, no build.
+# Pull requests get the same checks in CI's "Format and repository checks" job (one runner slot
+# per PR instead of three); this copy keeps main honest.
+name: Lists
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  format-changes:
+    name: Design format changes merge cleanly
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - run: bash scripts/test-format-pending.sh
+
+  sorted:
+    name: Lists are sorted one item per line
+    runs-on: ubuntu-24.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: lists
+      - run: cargo xtask lists

.github/workflows/packaging-lint.yml

@@ -6,9 +6,9 @@ name: Packaging lint
 on:
   push:
     branches: [main]
-    paths: [".github/workflows/**", "packaging/**"]
+    paths: [".github/workflows/**", "packaging/**", "assets/**"]
   pull_request:
-    paths: [".github/workflows/**", "packaging/**"]
+    paths: [".github/workflows/**", "packaging/**", "assets/platforms/**"]
   workflow_dispatch:
 
 permissions:
@@ -52,10 +52,14 @@ jobs:
           }
       - name: XML, desktop entry, AppStream, Flatpak manifest
         run: |
-          xmllint --noout packaging/windows/solidcraft.wxs packaging/windows/solidcraft.en-us.wxl packaging/macos/*.plist* packaging/linux/*.xml*
-          desktop-file-validate packaging/linux/ai.storyteller.solvecraft.desktop
-          sed -e 's/@VERSION@/0.0.0/' -e 's/@DATE@/2026-01-01/' packaging/linux/ai.storyteller.solvecraft.metainfo.xml.in >"$RUNNER_TEMP/ai.storyteller.solvecraft.metainfo.xml"
-          appstreamcli validate --no-net --explain "$RUNNER_TEMP/ai.storyteller.solvecraft.metainfo.xml"
-          python3 -c "import yaml; m = yaml.safe_load(open('packaging/linux/flatpak/ai.storyteller.solvecraft.bundle.yml')); assert m['id'] == 'ai.storyteller.solvecraft' and m['command'] == 'solidcraft'"
+          xmllint --noout assets/platforms/windows/solidcraft.wxs assets/platforms/windows/solidcraft.en-us.wxl assets/platforms/macos/*.plist* assets/platforms/linux/*.xml*
+          desktop-file-validate assets/platforms/linux/ai.storyteller.solidcraft.desktop
+          # The window's X11 class is its app id; the old id stays only as the rename shims.
+          grep -qx 'StartupWMClass=ai.storyteller.solidcraft' assets/platforms/linux/ai.storyteller.solidcraft.desktop
+          grep -q '<id>ai.storyteller.solvecraft</id>' assets/platforms/linux/ai.storyteller.solidcraft.metainfo.xml.in
+          grep -qF -e '--end-of-life-rebase=' packaging/flatpak-site.sh
+          sed -e 's/@VERSION@/0.0.0/' -e 's/@DATE@/2026-01-01/' assets/platforms/linux/ai.storyteller.solidcraft.metainfo.xml.in >"$RUNNER_TEMP/ai.storyteller.solidcraft.metainfo.xml"
+          appstreamcli validate --no-net --explain "$RUNNER_TEMP/ai.storyteller.solidcraft.metainfo.xml"
+          python3 -c "import yaml; m = yaml.safe_load(open('packaging/linux/flatpak/ai.storyteller.solidcraft.bundle.yml')); assert m['id'] == 'ai.storyteller.solidcraft' and m['command'] == 'solidcraft'"
           python3 -c "import yaml; m = yaml.safe_load(open('packaging/linux/snap/snapcraft.yaml')); assert m['name'] == 'solidcraft' and m['confinement'] == 'strict' and m['apps']['solidcraft']['command'] == 'usr/bin/solidcraft'"
           python3 -m py_compile packaging/linux/snap-smoke.py

.github/workflows/pages.yml

@@ -1,11 +1,13 @@
-# The documentation site on GitHub Pages: the book (docs/book) at /solidcraft/ and the web app
-# at /solidcraft/app/. Needs Settings → Pages → Source = GitHub Actions; skipped while the
+# The documentation site on GitHub Pages: the book (docs/book) at https://docs.solidcraft.io/
+# and the bundled web app at /app/. Needs Settings → Pages → Source = GitHub Actions; skipped while the
 # repository is private.
 name: Pages
 
 on:
   push:
     branches: [main]
+    # The site is the book and the web app: test data and the GitHub bots' scripts change neither.
+    paths-ignore: ["tests/**", "scripts/claim/**", "scripts/triage/**"]
   workflow_dispatch:
     inputs:
       release_tag:
@@ -45,11 +47,20 @@ jobs:
           curl -sSL "https://github.com/rust-lang/mdBook/releases/download/${MDBOOK_VERSION}/mdbook-${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz" | tar -xz -C "$HOME/.local/bin"
           curl -sSL "https://github.com/trunk-rs/trunk/releases/download/${TRUNK_VERSION}/trunk-x86_64-unknown-linux-gnu.tar.gz" | tar -xz -C "$HOME/.local/bin"
           echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+      - name: Install a software Vulkan driver (lavapipe)
+        # The book's pictures are `solidcraft-cli snapshot`s, drawn on the GPU; the runner has none.
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends mesa-vulkan-drivers libvulkan1
       - name: Build the book
+        env:
+          SOLIDCRAFT_GPU: software
         run: cargo xtask book
       - name: Build the web app
         working-directory: apps/solidcraft-web
-        run: trunk build --release --public-url /solidcraft/app/
+        run: trunk build --release --public-url ./
+      - name: Test the web app offline and across an update (headless Chrome)
+        run: cargo xtask web-offline-test --site dist/web
       - name: Assemble the site
         run: |
           mkdir -p site

.github/workflows/release.yml

@@ -429,6 +429,32 @@ jobs:
         run: |
           (cd artifacts && sha256sum -- * | tee SHA256SUMS.txt)
           sed "s/{version}/$VERSION/g" .github/release-notes.md >notes.md
+      - name: Sign the checksum list for in-app updates
+        # Optional until the UPDATE_SIGNING_KEY secret exists (docs/releasing.md, "Update
+        # signing"). The trusted comment names the release, which the app checks.
+        env:
+          UPDATE_SIGNING_KEY: ${{ secrets.UPDATE_SIGNING_KEY }}
+        run: |
+          # The key the app checks against (crates/ui-egui/src/update/install.rs, PUBLIC_KEY).
+          public_key=$(sed -n 's/^pub const PUBLIC_KEY: Option<&str> = Some("\([^"]*\)");/\1/p' crates/ui-egui/src/update/install.rs)
+          if [ -z "$UPDATE_SIGNING_KEY" ]; then
+            if [ -n "$public_key" ]; then
+              echo "::error::the app expects signed updates (PUBLIC_KEY is set) but the UPDATE_SIGNING_KEY secret is missing"
+              exit 1
+            fi
+            echo "UPDATE_SIGNING_KEY isn't set: SHA256SUMS.txt stays unsigned"
+            exit 0
+          fi
+          sudo apt-get update -q
+          sudo apt-get install -y --no-install-recommends minisign
+          umask 077
+          printf '%s\n' "$UPDATE_SIGNING_KEY" >"$RUNNER_TEMP/update.key"
+          minisign -S -s "$RUNNER_TEMP/update.key" -m artifacts/SHA256SUMS.txt \
+            -x artifacts/SHA256SUMS.txt.minisig -t "SolidCraft v$VERSION" </dev/null
+          rm -f "$RUNNER_TEMP/update.key"
+          if [ -n "$public_key" ]; then
+            minisign -V -P "$public_key" -m artifacts/SHA256SUMS.txt -x artifacts/SHA256SUMS.txt.minisig
+          fi
       - name: Publish nightly pre-release
         if: github.event_name == 'schedule'
         working-directory: artifacts

.github/workflows/triage.yml

@@ -0,0 +1,86 @@
+# Labels new issues and PRs from fixed rules, `/triage` for maintainers, asks short bug reports
+# for reproduction steps (`needs-info`, closed after 14 days unanswered), and a manual backfill
+# (CONTRIBUTING.md, "Labels and triage"). The logic is in scripts/triage/ (tested in ci.yml).
+name: Triage
+
+on:
+  issues:
+    types: [opened, labeled, edited]
+  issue_comment:
+    types: [created]
+  # pull_request_target so PRs from forks can be labelled. It runs the base branch's
+  # scripts/triage and only lists the PR's changed paths; the PR's code is never checked out.
+  pull_request_target:
+    types: [opened]
+  schedule:
+    - cron: '41 5 * * *'
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: 'Only report what would be labelled'
+        type: boolean
+        default: true
+
+permissions:
+  contents: read # to check out scripts/triage
+  issues: write
+  pull-requests: write
+
+concurrency:
+  group: triage-${{ github.event.issue.number || github.event.pull_request.number || 'repo' }}
+  cancel-in-progress: false
+
+jobs:
+  triage:
+    name: Triage bot
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    # Filtered here so the common events (every comment, every label) start no runner.
+    if: >-
+      (github.event_name == 'issue_comment' &&
+      github.event.comment.user.type != 'Bot' && startsWith(github.event.comment.body, '/triage')) ||
+      ((github.event_name == 'issue_comment' || github.event.action == 'edited') &&
+      contains(github.event.issue.labels.*.name, 'needs-info') &&
+      github.event.sender.login == github.event.issue.user.login) ||
+      (github.event.action == 'labeled' && startsWith(github.event.label.name, 'priority:') &&
+      contains(github.event.issue.labels.*.name, 'needs-triage')) ||
+      (github.event_name != 'issue_comment' && github.event.action != 'labeled' && github.event.action != 'edited')
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          sparse-checkout: scripts/triage
+      - uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        env:
+          DRY_RUN: ${{ inputs.dry_run }}
+        with:
+          script: |
+            const triage = require('./scripts/triage/triage.js');
+            const info = require('./scripts/triage/needs-info.js');
+            const event = context.eventName;
+            const action = context.payload.action;
+            const esc = (t) => String(t).replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' })[c]);
+            const th = (...names) => names.map((data) => ({ data, header: true }));
+            if (event === 'issue_comment') {
+              core.info(await triage.handleComment({ github, context }));
+              await info.handleReply({ github, context });
+            } else if (event === 'issues' && action === 'labeled') {
+              await triage.handleLabeled({ github, context });
+            } else if (event === 'issues' && action === 'edited') {
+              await info.handleReply({ github, context });
+            } else if (event === 'schedule') {
+              const closed = await info.sweep({ github, context });
+              core.info(`Closed for missing information: ${closed.join(', ') || 'none'}`);
+            } else if (event === 'workflow_dispatch') {
+              const dryRun = process.env.DRY_RUN !== 'false';
+              const plan = await triage.backfill({ github, context, dryRun });
+              const asks = await info.backfill({ github, context, dryRun });
+              await core.summary
+                .addHeading(dryRun ? `Backfill dry run: ${plan.length} unlabelled` : `Backfill: ${plan.length} labelled`)
+                .addTable([th('Item', 'Kind', 'Labels', 'Title'), ...plan.map((p) => [`#${p.number}`, p.pull ? 'PR' : 'issue', esc(p.labels.join(', ') || '—'), esc(p.title)])])
+                .addHeading(dryRun ? `needs-info dry run: ${asks.length} would be asked` : `needs-info: ${asks.length} asked`)
+                .addTable([th('Issue', 'Asks', 'Title'), ...asks.map((p) => [`#${p.number}`, esc(p.asks.join(', ')), esc(p.title)])])
+                .write();
+            } else {
+              core.info(`Labelled: ${(await triage.handleOpened({ github, context })).join(', ') || 'nothing'}`);
+              if (event === 'issues') await info.handleOpened({ github, context });
+            }

.github/workflows/winget.yml

@@ -0,0 +1,77 @@
+# Publishing a GitHub release (not a prerelease) opens a pull request at microsoft/winget-pkgs
+# that adds the new version of bherbruck.SolidCraft, so `winget install bherbruck.SolidCraft`
+# and `winget upgrade` get it. Komac (https://github.com/russellbanks/Komac) downloads the three
+# versioned MSIs, reads their product codes and copies the rest from the previous manifest.
+# Skipped until the owner adds the WINGET_TOKEN secret, and while the package isn't in
+# winget-pkgs yet; see docs/releasing.md.
+name: WinGet
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: Published release tag to submit (e.g. v0.11.1)
+        required: true
+
+permissions:
+  contents: read
+
+concurrency:
+  group: winget
+  cancel-in-progress: false
+
+env:
+  PACKAGE_ID: bherbruck.SolidCraft
+  KOMAC_VERSION: 2.16.0
+  KOMAC_SHA256: 7d2707fa6210f2789a3702de49fbd150b736dbf426ee0b9bc8e098736f9fd82d
+
+jobs:
+  submit:
+    runs-on: ubuntu-latest
+    steps:
+      - id: check
+        name: Check for the token and the package
+        env:
+          WINGET_TOKEN: ${{ secrets.WINGET_TOKEN }}
+          GH_TOKEN: ${{ github.token }}
+          TAG: ${{ github.event.release.tag_name || inputs.tag }}
+        run: |
+          if [ -z "$WINGET_TOKEN" ]; then
+            echo "No WINGET_TOKEN secret: nothing to submit."
+            exit 0
+          fi
+          case "$TAG" in
+            v[0-9]*.[0-9]*.[0-9]*-*|*nightly*) echo "$TAG is a prerelease: not submitted."; exit 0 ;;
+            v[0-9]*.[0-9]*.[0-9]*) ;;
+            *) echo "::error::Unexpected tag '$TAG'"; exit 1 ;;
+          esac
+          if ! gh api "repos/microsoft/winget-pkgs/contents/manifests/b/bherbruck/SolidCraft" --silent; then
+            echo "$PACKAGE_ID isn't in winget-pkgs yet: nothing to update."
+            exit 0
+          fi
+          echo "version=${TAG#v}" >>"$GITHUB_OUTPUT"
+          echo "tag=$TAG" >>"$GITHUB_OUTPUT"
+      - name: Install Komac
+        if: steps.check.outputs.version != ''
+        run: |
+          archive="komac-${KOMAC_VERSION}-x86_64-unknown-linux-gnu.tar.gz"
+          curl -fsSLo "$RUNNER_TEMP/$archive" \
+            "https://github.com/russellbanks/Komac/releases/download/v${KOMAC_VERSION}/$archive"
+          echo "$KOMAC_SHA256  $RUNNER_TEMP/$archive" | sha256sum -c -
+          tar -xzf "$RUNNER_TEMP/$archive" -C "$RUNNER_TEMP" komac
+      - name: Open the winget-pkgs pull request
+        if: steps.check.outputs.version != ''
+        env:
+          GITHUB_TOKEN: ${{ secrets.WINGET_TOKEN }}
+          VERSION: ${{ steps.check.outputs.version }}
+          TAG: ${{ steps.check.outputs.tag }}
+        run: |
+          base="https://github.com/${GITHUB_REPOSITORY}/releases/download/$TAG"
+          "$RUNNER_TEMP/komac" update "$PACKAGE_ID" --version "$VERSION" \
+            --urls "$base/solidcraft-$VERSION-windows-x64.msi" \
+                   "$base/solidcraft-$VERSION-windows-x86.msi" \
+                   "$base/solidcraft-$VERSION-windows-arm64.msi" \
+            --release-notes-url "https://github.com/${GITHUB_REPOSITORY}/releases/tag/$TAG" \
+            --submit

.gitignore

@@ -7,3 +7,6 @@
 /.claude/worktrees/
 /target-snapshot
 __pycache__/
+
+# cargo-mutants output (docs/mutation-testing.md)
+mutants.out*/

AGENTS.md

@@ -27,7 +27,15 @@ new uses of it anywhere else. Public docs/web/Flatpak deployments use project Pa
 ## Never crash
 People trust SolidCraft with their designs; a crash loses their work. **This outranks feature work.**
 - **No panics in non-test code:** no `unwrap()`, `expect()`, `panic!`, `unreachable!`, `todo!`,
-  `unimplemented!`; no `unsafe` (`unsafe_code = "forbid"`).
+  `unimplemented!`; no `unsafe` (`unsafe_code = "forbid"`). The exceptions, in the app crate and in
+  `crates/threedx-client` (which deny it instead), have no safe API: the macOS-only
+  `crates/threedx-client/src/macos.rs` (loads the 3Dconnexion driver's client framework at run time
+  and calls through its function pointers), two functions in
+  `apps/solidcraft/src/open_documents.rs` (macOS hands Finder files only to an Objective-C
+  method), the Windows-only `apps/solidcraft/src/native_crash.rs` (the exception filter that
+  records crashes inside native code such as graphics drivers) and the Windows-only
+  `apps/solidcraft/src/native_frame.rs` (the window procedure that answers the resize-border hit
+  test of the window without OS decorations).
 - **Errors are `Result<T, E>`** through the crate's error type and `?`. An unfinished feature
   returns an error ("not supported yet: …"); it never panics.
 - **Input-derived numbers are hostile** (command parameters, design files, control-channel
@@ -42,6 +50,8 @@ People trust SolidCraft with their designs; a crash loses their work. **This out
   `crashes replay <id>` (or the `diagnostics.crash_reports` command / MCP `crash_reports` tool).
 - **Prove it:** every crash fix lands with a regression test (see `hostile_params_never_panic`); a
   crash report's `design.solidcraft` + `replay.json` is the test's starting point.
+- **Where tests go:** a regression test goes into the existing test file for its area (booleans, blends,
+  shell, sweep, STEP, naming…), never a new file named after the bug (#3226).
 - Every production crate root carries
   `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`.
 
@@ -59,8 +69,11 @@ People trust SolidCraft with their designs; a crash loses their work. **This out
   nothing from FreeCAD is linked, vendored or shipped.) The sketch solver and the blend
   operations are our own.
 - **Assets — absolutely essential.** SolidCraft contains **no iconography, images, fonts or
-  artwork from commercial CAD products — ever.** Every icon is drawn in code
-  (`crates/ui-egui/src/icons.rs`). Any file asset must be original or openly licensed and **must have a row in ATTRIBUTION.md**
+  artwork from commercial CAD products — ever.** Command icons are the original SVG masters in
+  `assets/icons/ui/design/svg/`, compiled through `crates/ui-egui/src/icon_svg.rs`.
+  **Before any icon, icon assignment or media edit, read `assets/AGENTS.md`,
+  `assets/icons/ui/AGENTS.md` and `assets/icons/ui/STYLE_GUIDE.md`.** Use the canonical
+  bases and named finished references there; never invent a parallel icon style. Any file asset must be original or openly licensed and **must have a row in ATTRIBUTION.md**
   (`cargo xtask assets` enforces it). Screenshots of commercial CAD software are never committed.
   Breaking this rule is the most serious mistake you can make in this repo.
 - **Everything is a command.** User-visible behaviour = a command in `crates/engine/src/cmd/*`
@@ -75,15 +88,25 @@ People trust SolidCraft with their designs; a crash loses their work. **This out
   egui/eframe/winit/wgpu/rfd. **The UI crate is swappable.** Only `crates/kernel` may use `truck`.
 - **The UI is thin**: panels read engine state and act through `app.run(id, params)` /
   `app.start(id)`. Colours come from `theme::Tokens`.
-- **Rust only.** Units are millimetres and radians internally; Z is up.
+- **One set of camera controls**: every page or canvas with a camera (viewport, Render
+  preview, future flat pattern or drawing pages) calls `navigation::handle` with its `NavCaps`
+  (orbit off for flat 2D pages). New canvases must use `navigation::handle`; never hand-roll
+  camera input (a test rejects it).
+- **Application code is Rust only.** Units are millimetres and radians internally; Z is up.
+  Local asset authoring, lint and review tools use Python 3.11+ as documented in
+  `assets/AGENTS.md`; Python is not an application runtime dependency. The application exception is
+  JavaScript the browser requires: the service worker `apps/solidcraft-web/sw.js` (browsers only
+  run service workers as JavaScript) and the small inline scripts in `apps/solidcraft-web/index.html`.
+  Keep them minimal; `cargo xtask web-offline-test` covers the service worker.
 - **Quality gates** before every commit: `cargo xtask ci` (fmt, clippy -D warnings, tests,
   assets, layers). Commit after every feature arc that builds.
-- **Publishing**: `origin` is github.com/bherbruck/solidcraft. Changes land through **pull requests**:
-  push a branch, open a PR, and let GitHub CI run. Maintainers (and agents working for them) may
-  merge their own PR as soon as CI is green (`gh pr merge --squash`); a trivial fix (docs, typos)
-  may be merged right away. Keep each PR to one topic, rebase or merge `main` into it when it
-  conflicts, and never force-push `main`. Never commit `plan/`, build dirs (`target*/`) or
-  generated reference data; check `git ls-files` before pushing.
+- **Publishing**: the repository is github.com/tangency-labs/solidcraft. Changes land through
+  **pull requests** and the **merge queue**: push a branch and open a PR. The heavy CI jobs start
+  when a maintainer adds `approved-for-ci` after reviewing the code. Approved PRs go into the queue
+  with `gh pr merge N -R tangency-labs/solidcraft --squash --auto`; the queue runs the full suite
+  on each group before it lands on `main`. Keep each PR to one topic and one issue, and never
+  force-push `main`. Never commit `plan/`, build dirs (`target*/`) or generated reference data;
+  check `git ls-files` before pushing.
 - **Never break wasm**: everything below the apps must build for `wasm32-unknown-unknown`
   (`cargo xtask wasm`, part of `cargo xtask ci`).
 
@@ -102,13 +125,46 @@ People trust SolidCraft with their designs; a crash loses their work. **This out
 - Use a small public-safe example and check for private designs, paths, account details or
   other sensitive content before sharing. Attach media to the issue/PR or link to an accessible
   recording; do not commit generated screenshots or videos just to provide review evidence.
-- Throughout the work and before handoff, check current upstream commits and the relevant
-  PR's merge status. Keep your branch current with upstream merges, resolve conflicts without
-  discarding others' work, and re-run validation when integration changes the result. Use
-  `git pull --rebase origin main` before pushing as above; never force-push. Report the checked
-  upstream/PR state, any conflicts resolved and the validation performed. If a PR remains open,
-  keep monitoring it while the task is active and make its pending status clear at handoff;
-  do not claim it merged without checking.
+- Throughout the work and before handoff, check the relevant PR's merge status. Don't push to
+  an open PR only to catch up with `main` (no merge of `main`, no Update branch, no rebase for
+  that alone): every push restarts the whole CI run, and `main`'s own run catches what lands in
+  between, to be fixed forward. When you push a change anyway, or GitHub reports a conflict,
+  rebase onto the latest `main` (push your own branch with `--force-with-lease`); never merge
+  `main` into a PR. Resolve conflicts without discarding others' work; never force-push `main`.
+  Don't re-run CI on an unchanged commit: a real failure fails again. Re-run only a job that
+  runner trouble cancelled, with "Re-run failed jobs". Report the PR state you checked and any
+  conflicts resolved. If a PR remains open, keep monitoring it while the task is active and
+  make its pending status clear at handoff; do not claim it merged without checking.
+
+## Before you start: look at what is already open
+- Work with an authenticated GitHub CLI (`gh auth status`) and `git`; the checks below need both.
+- Pull the whole list, not one search: `gh pr list -R tangency-labs/solidcraft --state open --limit 500`
+  (drafts included) and `gh issue list -R tangency-labs/solidcraft --state open --limit 500`. Look for
+  work on the same issue, the same feature under another number, and PRs that change the files
+  you are about to change (`gh pr list ... --json number,title,files`).
+- If someone already has it, comment on their PR or issue instead of opening a second one. Two
+  PRs for one change can't both land, and one of them is wasted work and CI.
+
+## Claim = a draft PR
+- Before working on issue #N, check nobody has it: `gh pr list -R tangency-labs/solidcraft --state open --search "#N"`.
+- If none, branch from the latest `origin/main`, `git commit --allow-empty -m "claim: #N"`, push,
+  and open a **draft** PR titled `<summary> (#N)` right away. **The lowest-numbered open PR for an
+  issue wins**; if yours lost, close it. Opening the PR is the claim: the bot assigns you and
+  labels the issue `in progress` (or says on your PR who holds it). Reference `#N` in the PR title
+  so the bot can find it. Don't claim by editing files; comment `/claim` on the issue only to stake
+  a claim before you have a branch.
+- Push work in progress at least daily. A draft with no pushes for 72 hours may be taken over:
+  comment on it first, then open your own claim (you may start from its branch).
+  This takeover policy is separate from the bot's automatic cleanup deadlines in CONTRIBUTING.md.
+- On a shared build machine, check the load before a big build (`cut -d' ' -f1 /proc/loadavg`)
+  and wait while it is over 24; build with `nice`.
+
+## Design file format
+A change that saves something new in a design adds ONE file, `crates/doc/src/format/pending/<name>.rs`
+(a `//!` note, and `pub fn step` if older designs must be rewritten). Never edit `FORMAT`,
+`JSON_STEPS`, the history in `format.rs`, another change's file or a `v<N>/` folder: the build
+works out the number (the next one while anything is pending), and the release folds pending
+changes into `v<N>/` with `scripts/fold-format-pending.sh`. See CONTRIBUTING.md.
 
 ## Application releases
 Development pushes are not application releases. Follow `docs/releasing.md` when asked to
@@ -122,7 +178,10 @@ before the draft is verified.
 ## Running and looking at the app
 - `cargo run --release -p solidcraft -- --sample --control PORT` (sample design + control channel).
   Pick a free port. Without a display, run it under `Xvfb :99` with `DISPLAY=:99`.
-- Drive it with JSON lines on `127.0.0.1:PORT` (see `docs/control-protocol.md`):
+- Drive it with JSON lines on `127.0.0.1:PORT` (see `docs/control-protocol.md`). The first
+  request on a connection carries the launch's token as `"token"`: read it from
+  `~/.local/share/solidcraft/control/PORT.token`, or start the app with
+  `SOLIDCRAFT_CONTROL_TOKEN=$(openssl rand -hex 32)` and send that.
   - `{"id":1,"method":"engine.execute","params":{"command":"solid.extrude","params":{"distance":20}}}`
   - `{"id":2,"method":"ui.start","params":{"command":"sketch.create"}}` then `ui.click {x, y}`
   - `{"id":3,"method":"ui.screenshot","params":{"path":"/tmp/shot.png"}}` then read the PNG.
@@ -137,5 +196,11 @@ before the draft is verified.
 
 ## Roadmap
 `ROADMAP.md` (committed) tracks status, milestones and estimates. Update it whenever a
-milestone task lands. `cargo xtask features` regenerates `docs/features.md` (SolidCraft's
-commands by area, from the registry) when commands are added or renamed.
+milestone task lands. `docs/features.md` (SolidCraft's commands by area, from the registry) and
+`THIRD-PARTY-LICENSES.txt` are regenerated on `main` after each merge by the Generated files
+workflow; never regenerate them in a PR.
+
+## Lists many PRs add to
+Keep them conflict-free (CONTRIBUTING.md, "Lists many changes add to"): message catalogs sorted
+(`cargo xtask lists --fix`), `mod` lines in their sorted group, the language list English first
+then by id, generated files left to `main`, and a design-format change as one new file.

ATTRIBUTION.md

@@ -8,44 +8,55 @@ file is missing from this table.
 templates, materials or help text.** Every asset is original work by SolidCraft contributors or
 third-party material under an open licence. Screenshots of Autodesk software are never committed.
 
-Generated-in-code assets are original and have no file to list:
-- the UI icon set (`crates/ui-egui/src/icons.rs`);
-- the axis view, navigation bar and timeline glyphs (`crates/ui-egui/src/viewport.rs`,
-  `crates/ui-egui/src/timeline.rs`).
+Editable drawing code, native projects and shipped exports are collected under `assets/`.
 
 ## Files
 
 | File | Author | Source | Licence |
 |---|---|---|---|
-| assets/icon.svg | SolidCraft contributors | original macOS adaptation of the code-drawn SolidCraft mark, edited and exported with VectorCraft; Apple HIG and production templates consulted as layout references only | MIT OR Apache-2.0 |
-| assets/SolidCraft.icon/icon.json | SolidCraft contributors | approved Icon Composer composition and appearance settings for the original SolidCraft artwork | MIT OR Apache-2.0 |
-| assets/SolidCraft.icon/Assets/02-grid.svg | SolidCraft contributors | original perspective grid with elliptical radial alpha, exported from VectorCraft | MIT OR Apache-2.0 |
-| assets/SolidCraft.icon/Assets/02-grid-dark.svg | SolidCraft contributors | original blue perspective grid with elliptical radial alpha, exported from VectorCraft for the Dark appearance | MIT OR Apache-2.0 |
-| assets/SolidCraft.icon/Assets/03-solid-blue-cutout.svg | SolidCraft contributors | original saturated blue CAD solid with transparent topology cutouts, edited and exported with VectorCraft | MIT OR Apache-2.0 |
-| assets/Assets.car | SolidCraft contributors | Apple actool compilation of assets/SolidCraft.icon for macOS; contains original artwork only | MIT OR Apache-2.0 |
-| assets/icon.vectorcraft | SolidCraft contributors | editable VectorCraft source for assets/icon.svg, with named face and background layers | MIT OR Apache-2.0 |
-| assets/icon.png | SolidCraft contributors | 1024 × 1024 transparent sRGB export of assets/icon.svg from VectorCraft | MIT OR Apache-2.0 |
-| assets/icon.icns | SolidCraft contributors | macOS fallback compiled by Apple's actool from the approved assets/SolidCraft.icon composition | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_16x16.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_16x16@2x.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_32x32.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_32x32@2x.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_128x128.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_128x128@2x.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_256x256.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_256x256@2x.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_512x512.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
-| assets/icon.iconset/icon_512x512@2x.png | SolidCraft contributors | native sips export from assets/icon.png | MIT OR Apache-2.0 |
+| examples/render-studio.json | SolidCraft contributors | original procedural box/cylinder enclosure script for the integrated Render workspace | MIT OR Apache-2.0 |
+| examples/render-opaque-studio.json | SolidCraft contributors | original procedural sphere study varying opaque metal fraction and roughness independently; no external assets or engineering data | MIT OR Apache-2.0 |
+| crates/gpu/src/pbr.rs | SolidCraft contributors | original WGSL translation of SolidCraft's opaque surface and fixed studio reference, embedded as Rust source; no external shader code | MIT OR Apache-2.0 |
+| assets/icons/app/macos/source/SolidCraft.icon/icon.json | SolidCraft contributors | approved Icon Composer composition and appearance settings for the original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/app/macos/source/SolidCraft.icon/Assets/02-grid.svg | SolidCraft contributors | original perspective grid with elliptical radial alpha, exported from VectorCraft | MIT OR Apache-2.0 |
+| assets/icons/app/macos/source/SolidCraft.icon/Assets/02-grid-dark.svg | SolidCraft contributors | original blue perspective grid with elliptical radial alpha, exported from VectorCraft for the Dark appearance | MIT OR Apache-2.0 |
+| assets/icons/app/macos/source/SolidCraft.icon/Assets/03-solid-blue-cutout.svg | SolidCraft contributors | original saturated blue CAD solid with transparent topology cutouts, edited and exported with VectorCraft | MIT OR Apache-2.0 |
+| assets/icons/app/macos/exports/Assets.car | SolidCraft contributors | Apple actool compilation of assets/icons/app/macos/source/SolidCraft.icon for macOS; contains original artwork only | MIT OR Apache-2.0 |
+| assets/archive/icons/macos-v1/source/icon.vectorcraft | SolidCraft contributors | retained editable historical VectorCraft source, with named face and background layers; redundant exports retired | MIT OR Apache-2.0 |
+| assets/icons/app/macos/exports/icon.icns | SolidCraft contributors | macOS fallback compiled by Apple's actool from the approved assets/icons/app/macos/source/SolidCraft.icon composition | MIT OR Apache-2.0 |
+| docs/screenshots/class-a-blend.png | SolidCraft contributors | screenshot of SolidCraft itself: two boxes bridged by `surface.blend` (a 40x10 sheet, `solidcraft-cli snapshot` of plan/evidence script ev_blend) | MIT OR Apache-2.0 |
+| docs/screenshots/class-a-crown.png | SolidCraft contributors | screenshot of SolidCraft itself: a patch crowned with `surface.patch crown=0.3` over a saddle rim (`solidcraft-cli snapshot`) | MIT OR Apache-2.0 |
+| docs/screenshots/class-a-boundary.png | SolidCraft contributors | screenshot of SolidCraft itself: a patch through two sketch lines built by `surface.boundary` with `crown: 0.4` (`solidcraft-cli snapshot`) | MIT OR Apache-2.0 |
 | docs/screenshots/sample-plate.png | SolidCraft contributors | screenshot of SolidCraft itself (`solidcraft --sample`) | MIT OR Apache-2.0 |
-| docs/screenshots/enclosure-demo-0.2.1.gif | SolidCraft contributors | original electronics enclosure screen recording of the actual SolidCraft 0.2.1 English desktop UI, generated with examples/demo/record_ui.sh and its original animated pointer overlay (4× playback) | MIT OR Apache-2.0 |
-| docs/screenshots/enclosure-demo-0.2.1.mp4 | SolidCraft contributors | original electronics enclosure screen recording of the actual SolidCraft 0.2.1 English desktop UI, generated with examples/demo/record_ui.sh and its original animated pointer overlay (4× playback) | MIT OR Apache-2.0 |
+| assets/samples/exports/0.png | SolidCraft contributors | original Sample Plate from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/1.png | SolidCraft contributors | original Sheet Metal Bracket from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/2.png | SolidCraft contributors | original Hinge Assembly from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/3.png | SolidCraft contributors | original Plastic Enclosure from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/4.png | SolidCraft contributors | original Bolted Flange from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/5.png | SolidCraft contributors | original Vent Plate from `crates/engine/src/sample.rs`, exported by the SolidCraft thumbnail renderer | MIT OR Apache-2.0 |
+| assets/samples/exports/scripts.json | SolidCraft contributors | SHA-256 fingerprints of the original sample scripts, generated with the shipped thumbnails | MIT OR Apache-2.0 |
+| docs/screenshots/demo-0.8.gif | SolidCraft contributors | original screen recording of the actual SolidCraft 0.8 English desktop UI modelling an original Raspberry Pi 4 case (no logos or branding; the engraved text is set in the system's DejaVu Sans Bold), generated with examples/demo/record_ui.sh and its original animated pointer overlay (9× playback) | MIT OR Apache-2.0 |
+| docs/screenshots/demo-0.8.mp4 | SolidCraft contributors | original screen recording of the actual SolidCraft 0.8 English desktop UI modelling an original Raspberry Pi 4 case (no logos or branding; the engraved text is set in the system's DejaVu Sans Bold), generated with examples/demo/record_ui.sh and its original animated pointer overlay (9× playback) | MIT OR Apache-2.0 |
+| docs/screenshots/rover-build.gif | 0xlillith (model); SolidCraft contributors (recording) | screen recording of the actual SolidCraft desktop UI replaying the timeline of the SELENE rover (`Rover-recorded.solidcraft` from https://github.com/0xlillith/solidcraft-rover, an original model by 0xlillith built through SolidCraft MCP); the model's lettering follows Ubuntu Light outlines (Canonical Ltd., Ubuntu Font Licence 1.0, as noted in that repository); the emblem is the SolidCraft project icon (2× playback) | MIT OR Apache-2.0 |
+| docs/screenshots/rover-build.mp4 | 0xlillith (model); SolidCraft contributors (recording) | screen recording of the actual SolidCraft desktop UI replaying the timeline of the SELENE rover (`Rover-recorded.solidcraft` from https://github.com/0xlillith/solidcraft-rover, an original model by 0xlillith built through SolidCraft MCP); the model's lettering follows Ubuntu Light outlines (Canonical Ltd., Ubuntu Font Licence 1.0, as noted in that repository); the emblem is the SolidCraft project icon | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/model-floating.png | SolidCraft contributors | original UX mockup (Model tab, floating layout) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/model-compact.png | SolidCraft contributors | original UX mockup (Model tab, compact docked layout) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/sketch.png | SolidCraft contributors | original UX mockup (Sketch tab) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/sheet-metal.png | SolidCraft contributors | original UX mockup (Sheet Metal contextual tab) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/start-page.png | SolidCraft contributors | original UX mockup (start page (File view)) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/workspaces.png | SolidCraft contributors | original UX mockup (workspace switcher) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| docs/design/ux-redesign/command-map.png | SolidCraft contributors | original UX mockup (ribbon command map) rendered from an HTML mockup that uses the original Technical Accent icon set; no third-party artwork, and not a screenshot of any other CAD product | MIT OR Apache-2.0 |
+| assets/branding/web/source/og.png | SolidCraft contributors | original 1280 × 640 social preview card (the SolidCraft mark, name and tagline), served by the docs site for link previews | MIT OR Apache-2.0 |
 | docs/book/src/generated/sample-plate.png | SolidCraft contributors | copy of docs/screenshots/sample-plate.png made by `cargo xtask book` (gitignored) | MIT OR Apache-2.0 |
 | docs/book/src/generated/bracket.png | SolidCraft contributors | rendered by `cargo xtask book` (`solidcraft-cli snapshot examples/bracket.json`; gitignored) | MIT OR Apache-2.0 |
 | docs/book/src/generated/enclosure.png | SolidCraft contributors | rendered by `cargo xtask book` (`solidcraft-cli snapshot docs/book/scripts/enclosure.json`; gitignored) | MIT OR Apache-2.0 |
 | docs/book/src/generated/revolve.png | SolidCraft contributors | rendered by `cargo xtask book` (`solidcraft-cli snapshot docs/book/scripts/revolve.json`; gitignored) | MIT OR Apache-2.0 |
 | docs/book/src/generated/sheet-metal.png | SolidCraft contributors | rendered by `cargo xtask book` (`solidcraft-cli snapshot docs/book/scripts/sheet-metal.json`; gitignored) | MIT OR Apache-2.0 |
-| crates/sketch/fonts/LiberationSans-Regular.ttf | Red Hat, Inc. (Liberation Fonts 2.x; digitized data Google) | https://github.com/liberationfonts (Debian fonts-liberation), unmodified; licence text in crates/sketch/fonts/OFL.txt; used for sketch Text outlines | SIL OFL 1.1 |
-| apps/solidcraft-web/fonts/BIZUDPGothic-Regular.ttf | The BIZ UDGothic Project Authors | https://github.com/googlefonts/morisawa-biz-ud-gothic (Google Fonts), unmodified; licence text in apps/solidcraft-web/fonts/OFL.txt; used for web UI Japanese font | SIL OFL 1.1 |
+| assets/fonts/ibm-plex-mono/IBMPlexMono-Regular.ttf | IBM Corp. (IBM Plex Mono) | https://github.com/IBM/plex (via google/fonts), unmodified; licence text in assets/fonts/ibm-plex-mono/OFL.txt; the interface monospace font | SIL OFL 1.1 |
+| assets/fonts/ibm-plex-sans/IBMPlexSans-Variable.ttf | IBM Corp. (IBM Plex Sans, variable wdth and wght) | https://github.com/IBM/plex (via google/fonts), unmodified; licence text in assets/fonts/ibm-plex-sans/OFL.txt; the default interface font | SIL OFL 1.1 |
+| docs/book/src/generated/tool-preview.png | SolidCraft contributors | rendered by `cargo xtask book` (`solidcraft-cli snapshot docs/book/scripts/tool-preview.json`; gitignored) | MIT OR Apache-2.0 |
+| assets/fonts/liberation-sans/LiberationSans-Regular.ttf | Red Hat, Inc. (Liberation Fonts 2.x; digitized data Google) | https://github.com/liberationfonts (Debian fonts-liberation), unmodified; licence text in assets/fonts/liberation-sans/OFL.txt; used for sketch Text outlines | SIL OFL 1.1 |
+| assets/fonts/biz-udp-gothic/BIZUDPGothic-Regular.ttf | The BIZ UDGothic Project Authors | https://github.com/googlefonts/morisawa-biz-ud-gothic (Google Fonts), unmodified; licence text in assets/fonts/biz-udp-gothic/OFL.txt; used for web UI Japanese font | SIL OFL 1.1 |
 | tests/oracle/17-loft/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/17-loft/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
 | tests/oracle/23-bracket-multifeature/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/23-bracket-multifeature/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
 | tests/oracle/28-blind-pocket-fillets/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/28-blind-pocket-fillets/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
@@ -67,6 +78,366 @@ Generated-in-code assets are original and have no file to list:
 | tests/oracle/63-hinge-knuckle/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/63-hinge-knuckle/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
 | tests/oracle/65-sketch-gear-tooth/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/65-sketch-gear-tooth/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
 
+| assets/appearances/library.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/fonts/biz-udp-gothic/OFL.txt | The BIZ UDGothic Project Authors | Unmodified accompanying font licence | SIL OFL 1.1 |
+| assets/fonts/ibm-plex-mono/OFL.txt | IBM Corp. | Unmodified accompanying font licence | SIL OFL 1.1 |
+| assets/fonts/ibm-plex-sans/OFL.txt | IBM Corp. | Unmodified accompanying font licence | SIL OFL 1.1 |
+| assets/fonts/liberation-sans/OFL.txt | Red Hat, Inc.; Liberation Fonts contributors | Unmodified accompanying font licence | SIL OFL 1.1 |
+| assets/icons/app/linux/exports/hicolor/128x128/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/16x16/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/24x24/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/256x256/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/32x32/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/48x48/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/512x512/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/linux/exports/hicolor/64x64/apps/ai.storyteller.solidcraft.png | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/shared/source/app_icon.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/icons/app/shared/source/windows_ico.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/icons/app/windows/exports/solidcraft-executable.ico | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/app/windows/exports/solidcraft.ico | SolidCraft contributors | Generated from assets/icons/app/shared/source/app_icon.rs with the original CLI/ICO encoders | MIT OR Apache-2.0 |
+| assets/icons/ui/source/glyphs.rs | SolidCraft / VectorCraft contributors | Original glyphs; caption geometry adapted from VectorCraft titlebar.rs (https://github.com/storytold/vectorcraft) | MIT OR Apache-2.0 |
+| assets/icons/ui/source/markers.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/icons/ui/source/navigation.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/icons/ui/source/pointer.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/locales/cs.json | potuzai | Czech translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/da.json | SolidCraft contributors | Original Danish translation of SolidCraft's English catalog; no commercial CAD text used | MIT OR Apache-2.0 |
+| assets/locales/de.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/locales/en.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/locales/es.json | jawler | Spanish (Spain) translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/fr.json | rlartot | French translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/gl.json | Pablo López (pablopeza) | Galician translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/it.json | SolidCraft contributors | Original Italian translation of SolidCraft's English catalog; no commercial CAD text used | MIT OR Apache-2.0 |
+| assets/locales/ja.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/locales/ko.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/locales/ms.json | A.Hakim (a-hakim) | Malay translation of the English message catalog | MIT OR Apache-2.0 |
+| assets/locales/pl.json | cyryllo | Polish translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/ru.json | Alex Pro (del000) | Russian translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/pt-BR.json | DuBearte | Brazilian Portuguese translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/tr.json | macrulz54 | Turkish translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/uk.json | Igor Bronovskyi (BrunIF) | Ukrainian translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/vi.json | vandang890615 | Vietnamese translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/zh.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/materials/library.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/platforms/linux/ai.storyteller.solidcraft.desktop | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/linux/ai.storyteller.solidcraft.metainfo.xml.in | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/linux/ai.storyteller.solidcraft.mime.xml | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/macos/Info.plist.in | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/macos/README.txt | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/windows/solidcraft.en-us.wxl | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/platforms/windows/solidcraft.wxs | PhotoCraft / SolidCraft contributors | PhotoCraft packaging templates (https://github.com/storytold/photocraft), adapted for SolidCraft | Apache-2.0 |
+| assets/shaders/viewport.wgsl | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/styles/ui/palettes.rs | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-dark.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-dark-hard.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-dark-soft.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-light.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-light-hard.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/ui/themes/gruvbox-light-soft.json | SolidCraft contributors | original SolidCraft theme file mapping SolidCraft's UI colours to the Gruvbox palette's colour values (Gruvbox by Pavel Pertsev, https://github.com/morhetz/gruvbox, MIT) | MIT OR Apache-2.0 |
+| assets/styles/web/loading-logo.svg | SolidCraft contributors | Animation of the SolidCraft mark, built from the paths and gradients of assets/icons/app/macos/source/SolidCraft.icon/Assets/03-solid-blue-cutout.svg; original animation | MIT OR Apache-2.0 |
+| assets/styles/web/loading.css | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
+| crates/io/src/native_cad/fixtures/block.FCStd | SolidCraft contributors | original 10 × 20 × 30 mm test box saved by FreeCAD 1.1.4 run as an external program (`make_block_fcstd.py` beside it); no third-party geometry | MIT OR Apache-2.0 |
+| crates/io/src/native_cad/fixtures/block.3dm | SolidCraft contributors | original 10 × 20 × 30 mm test box written with McNeel's MIT-licensed rhino3dm Python package (`make_block_3dm.py` beside it); no third-party geometry | MIT OR Apache-2.0 |
+| assets/icons/ui/design/aliases.toml | SolidCraft contributors | icon ids that share a master, original SolidCraft data | MIT OR Apache-2.0 |
+| assets/icons/ui/design/palette.toml | SolidCraft contributors | icon colour roles (light and dark) and accents, original SolidCraft data | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/bug_report.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/chevron.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/chevron_right.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/close.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/disclosure_closed.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/disclosure_open.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/fit.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/folder.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/help.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/home.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/lookat.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/moon.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/nav_settings.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/orbit.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/plus.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/pan.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/perspective.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/redo.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/save.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/settings.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/spin.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/style.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/undo.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/zoom.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/accessibility.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/activate.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/align.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/appearance.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/arc3.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/arc_center.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/arc_slot.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/arc_tangent.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/as_built.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/auto_constrain.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/bendtable.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/blend.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/blend_surface.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/body.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/boss.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/boundary.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/boundary_fill.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/box.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/break.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_coincident.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_collinear.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_concentric.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_equal.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_fix.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_hv.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_midpoint.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_parallel.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_perpendicular.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_polygon.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_smooth.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_symmetry.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/c_tangent.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/camera.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/canvas.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/capture.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/center_of_mass.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/centerline.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/chain.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/chamfer.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/checkpoint.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/circle.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/circle2.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/circle3.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/circle_tt.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/circle_ttt.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/coil.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/combine.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/component.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/compute.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/configuration_table.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/conic.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/constrainer.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/construction.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/convert_sheet.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/copy.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/curvature_comb.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/curvature_map.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/cylinder.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/decal.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/delete.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/dimension.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/dots.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/draft.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/draft_analysis.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/drive.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/dxf.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/edge_continuity.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/edit.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/ellipse.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/emboss.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/environment_map.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/explode.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/export.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/extend.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/extrude.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/eye.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/fastener.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/fillet.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/filter.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/finish.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/fit_section.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/flange.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/flat.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/fold.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/folder.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/graph.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/hem.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/hole.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/import.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/include.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/inspect.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/interference.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/intersect.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/intersection_curve.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/iso_analysis.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/iso_curve.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/joint.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/joint_origin.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/library.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/line.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/line_mid.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/lip.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/list.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/loft.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/material.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/measure.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/min_radius.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/mirror.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/motion_link.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/move.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/new.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/offset.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/offset_face.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/offset_surface.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/open.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/origin.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/params.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/paste.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/patch.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern_circ.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern_path.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern_rect.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/perforate.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pipe.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/silhouette.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/assistant.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/agent_link.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/offset_two_sides.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/offset_symmetric.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/import_tray.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/export_tray.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/placeholder.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_angle.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plastic_assign.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plastic_rule.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/play.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/polygon.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/presspull.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/project.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/project_surface.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rect.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rect3.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rect_center.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rect_rounded.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/refold.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rename.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/render_image.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/render_scene.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/reorder.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rest.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/restore.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/reverse_normal.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/revert.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/revolve.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rib.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rigid_group.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rollback.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/ruled.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/scale.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/section.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/select.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sheet.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sheet_rules.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/shell.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch_chamfer.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch_fillet.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch_mirror.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/slot.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/snap.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sphere.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/spline.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/spline_cv.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/split_body.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/split_face.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/spun.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/star.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/status_error.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/status_warning.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/stitch.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/flat/suppress.svg | SolidCraft contributors | single-colour application/navigation icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/surface.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/svg.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sweep.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/text.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/thicken.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/thread.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/torus.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/trim.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/unfold.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/unstitch.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/untrim.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/update.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/zebra.svg | SolidCraft contributors | two-tone modelling icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/as_built.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/component.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/curvature_comb.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/interference.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/iso_analysis.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/joint.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/pattern.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/small/section.svg | SolidCraft contributors | small-slot icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/workspace/ws_animate.svg | SolidCraft contributors | workspace icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/polygon_circumscribed.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/polygon_edge.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/slot_overall.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/slot_center.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/arc_slot_center.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch_chamfer_angle.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/sketch_chamfer_two_distances.svg | SolidCraft contributors | original sketch variant icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/gear.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/rack_pinion.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/screw.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/cam.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/trace.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/agent_chat.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/normal.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/infinite.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern_flip.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/pattern_center.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/reach.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/cut.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/compare.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/web.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/replace_face.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/bounding_solid.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/delete_face.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/snap_fit.svg | SolidCraft contributors | original icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/contact_sets.svg | SolidCraft contributors | original contact icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/contact_all.svg | SolidCraft contributors | original contact icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/contact_off.svg | SolidCraft contributors | original contact icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/contact_new.svg | SolidCraft contributors | original contact icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis_through_cylinder.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis_normal_to_face.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis_two_planes.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis_two_points.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/axis_edge.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_vertex.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_two_edges.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_three_planes.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_center.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_edge_plane.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/point_along_path.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_midplane.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_two_edges.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_three_points.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_tangent.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_along_path.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/model/plane_perpendicular.svg | SolidCraft contributors | original construction icon master (64 grid) | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/workspace/ws_design.svg | SolidCraft contributors | workspace icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/workspace/ws_drawing.svg | SolidCraft contributors | workspace icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/svg/workspace/ws_render.svg | SolidCraft contributors | workspace icon master (64 grid), original SolidCraft artwork | MIT OR Apache-2.0 |
+| assets/icons/ui/design/references.toml | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/author/bases.py | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/author/new_icon.py | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/review/index.html | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/review/guide.html | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/review/review.css | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/review/review.js | SolidCraft contributors | original icon authoring or review tool resource | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/icon_palette.py | SolidCraft contributors | Original shared semantic icon palette resolver for repository tools | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/icon_status.py | SolidCraft contributors | icon lint, status page or preview tool (standard-library Python), original SolidCraft code | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/lint_icons.py | SolidCraft contributors | icon lint, status page or preview tool (standard-library Python), original SolidCraft code | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/preview.py | SolidCraft contributors | icon lint, status page or preview tool (standard-library Python), original SolidCraft code | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/review_state.py | SolidCraft contributors | icon review state helper (standard-library Python), original SolidCraft code | MIT OR Apache-2.0 |
+| assets/icons/ui/design/requested_icons.txt | SolidCraft contributors | Runtime icon requests collected by the headless menu audit, original SolidCraft data | MIT OR Apache-2.0 |
+| assets/icons/ui/design/review.json | SolidCraft contributors | icon review state (accepted icons and notes), original SolidCraft data | MIT OR Apache-2.0 |
+| assets/icons/ui/design/tools/author/lib.py | SolidCraft contributors | icon authoring script (standard-library Python), original SolidCraft code | MIT OR Apache-2.0 |
+
+| docs/book/src/og.png | SolidCraft contributors | copy of assets/branding/web/source/og.png staged by cargo xtask book (gitignored) | MIT OR Apache-2.0 |
+| docs/sponsors/blacksmith-ci-powered.png | Blacksmith (blacksmith.sh) | "CI powered by Blacksmith" sponsor banner supplied by Blacksmith for the sponsorship credit; used only to credit the sponsor, not part of the application | © Blacksmith, used with permission |
+
 ## Code adapted from sibling projects
 
 | SolidCraft file | Adapted from | Licence |
@@ -80,9 +451,41 @@ Generated-in-code assets are original and have no file to list:
 | crates/mcp/src/tools.rs (tool schema helpers and argument checking) | CADCraft `crates/mcp/src/tools.rs`, GridCraft `crates/mcp/src/tools.rs` | MIT OR Apache-2.0 |
 | crates/io/src/threemf.rs (bounded zip part reading and writing) | GridCraft `crates/xlsx/src/package.rs` | MIT OR Apache-2.0 |
 | crates/ui-egui/src/titlebar.rs (title bar drag, caption buttons, resize zones, their tests) and the window setup in apps/solidcraft/src/main.rs | VectorCraft `crates/ui-egui/src/titlebar.rs`, `apps/vectorcraft/src/main.rs` | MIT OR Apache-2.0 |
+| apps/solidcraft/src/open_documents.rs (macOS: files opened from Finder and the Dock, its test) | VectorCraft `apps/vectorcraft/src/open_documents.rs` (https://github.com/storytold/vectorcraft) | MIT OR Apache-2.0 |
 | LICENSE-MIT, LICENSE-APACHE (licence text) | CADCraft | — |
 | .github/workflows/release.yml, .github/workflows/packaging-lint.yml and packaging/ (release pipeline: Linux AppImage/deb/rpm/Flatpak/tar.gz, FreeBSD, macOS dmg, Windows MSI/portable zip, web zip; AppRun, nfpm, Flatpak, WiX and Info.plist templates) | PhotoCraft (https://github.com/storytold/photocraft) `.github/workflows/{release,packaging-lint}.yml`, `packaging/` | Apache-2.0 |
 
+## Incremental HDR codec adapter
+
+`crates/render/src/lighting/hdr.rs` adapts the scanline/component/old-RLE decoding
+state machines from the Radiance decoder in `image` 0.25.10
+([source](https://docs.rs/crate/image/0.25.10/source/src/codecs/hdr/decoder.rs)),
+MIT OR Apache-2.0. Metadata parsing still uses that library. The adapter makes row
+work cooperative and adds checked run lengths, zero-run rejection, width validation,
+header/input/radiance bounds and cancellation. Original licence texts are retained
+in THIRD-PARTY-LICENSES.txt; no images or artwork from that project are copied.
+
+## File-format crates
+
+| Crate | Used for | Licence |
+|---|---|---|
+| gltf 1.4.1, gltf-json 1.4.1, gltf-derive 1.4.1 (https://github.com/gltf-rs/gltf) | glTF 2.0 import (crates/io/src/gltf_in.rs): the JSON document model and its reference checks; the GLB container, buffers and accessors are read by SolidCraft's own code | MIT OR Apache-2.0 |
+| inflections 1.1.1 (build-time, through gltf-derive) | case conversion in gltf's derive macros | MIT |
+| lazy_static 1.5.1 (through gltf-json) | | MIT OR Apache-2.0 |
+
+The glTF test files are built by the tests themselves (crates/io/src/gltf_in_tests.rs,
+crates/engine/src/tests/gltf_import.rs); no third-party models are committed.
+
+## FreeCAD and Rhino import library
+
+FreeCAD `.FCStd` and Rhino `.3dm` files are read with [cadmpeg](https://github.com/cadmpeg/cadmpeg)
+0.6.1 (Apache-2.0), linked as the crates `cadmpeg-core`, `cadmpeg-ir`, `cadmpeg-registry`,
+`cadmpeg-container`, `cadmpeg-codec-freecad`, `cadmpeg-codec-rhino` and `cadmpeg-codec-step`
+in native builds (`crates/io/src/native_cad.rs`). Only those open-format codecs are built: no
+default features, so cadmpeg's codecs for commercial CAD formats and its ShapeManager/ACIS
+codec are not compiled in. Its licence text is in THIRD-PARTY-LICENSES.txt; no code from it is
+copied into SolidCraft.
+
 ## Recovered contributions
 
 | SolidCraft file | Original contribution | Licence |
@@ -93,9 +496,10 @@ Generated-in-code assets are original and have no file to list:
 
 | Directory | Source | Licence | Changes |
 |---|---|---|---|
-| vendor/truck-meshalgo | truck-meshalgo 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | meshing: parameter searches kept inside the surface domain (vendor/README.md) |
+| vendor/truck-meshalgo | truck-meshalgo 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | meshing: bounded parameter searches, collapsed-boundary projection, subdivision and provisional fixed-grid previews (vendor/README.md) |
 | vendor/truck-stepio | truck-stepio 0.3.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | STEP writer: intersection-curve surfaces written at unique ids (vendor/README.md) |
-| vendor/truck-shapeops | truck-shapeops 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | robust meshing and nearest-parameter fallback in booleans; degenerate intersection-curve rejection; face and edge history of booleans; trace macro (vendor/README.md) |
+| vendor/truck-shapeops | truck-shapeops 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | robust meshing and nearest-parameter fallback in booleans; degenerate intersection-curve rejection; face and edge history of booleans; trace macro; corner choice at vertices several intersection curves end on; reuse of an operand's meshes (vendor/README.md) |
+| vendor/truck-geometry | truck-geometry 0.5.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | intersection curves divided from their neighbours' surface parameters; surface second derivatives (vendor/README.md) |
 | vendor/matext4cgmath | matext4cgmath 0.1.0, https://github.com/ricosjp/matext4cgmath (RICOS Co. Ltd.) | Apache-2.0 | root refinement stops after 100 Newton steps (vendor/README.md) |
 
 ## Vendored renderer compatibility fix
@@ -106,3 +510,7 @@ its original `egui.wgsl` shader are retained; no images or other artwork are cop
 SolidCraft's narrow patch selects a safe 1x MSAA path on the chosen OpenGL adapter
 and shares that effective count with the surface attachments and CAD callbacks.
 Vulkan, DirectX 12, Metal and WebGPU retain their requested multisampling.
+A frame whose meshes the GPU refuses to stage (device lost or out of memory) is
+skipped with a warning instead of panicking (#1469).
+Paint callbacks are prepared only after a drawable is acquired, so a skipped
+surface frame cannot strand cached meshes without their GPU initialization.

CLAUDE.md

@@ -1,118 +1,3 @@
-# SolidCraft — instructions for agents
+@AGENTS.md
 
-SolidCraft is a clean-room, open-source, pure-Rust parametric 3D CAD application:
-sketches with a constraint solver, a parametric timeline of features, a B-rep
-kernel, and a desktop UI that agents can drive. Projects published by
-[storytold](https://github.com/storytold) can serve as references for implementation conventions.
-Any code adapted from other projects (MIT OR Apache-2.0) is noted in ATTRIBUTION.md.
-
-## Product name
-SolidCraft everywhere: crates `solidcraft-*`, binaries `solidcraft` and `solidcraft-cli`,
-`.solidcraft` designs, the `solidcraft/N` format tag, `SOLIDCRAFT_*` environment variables,
-settings and recovery folders, the MCP server name, docs, CI and packaging. The old name
-survives only in the explicit compatibility shims listed in `docs/compatibility.md`; don't add
-new uses of it anywhere else. Public docs/web/Flatpak deployments use project Pages
-`/solidcraft/`; do not add permanent old-name Pages aliases.
-
-## Start every session here
-1. Read `plan/STATUS.md` (current milestone, next task), then the task in `plan/execution-plan.md`
-   and the relevant `plan/architecture.md` section.
-2. Kernel and library decisions: `plan/adr/0001-geometry-kernel.md` (what we may depend on, what
-   is rejected for licence reasons).
-3. Follow the autonomous operation protocol (`plan/execution-plan.md` §6). Don't stop to ask
-   unless it lists the decision as the owner's.
-
-`plan/` is gitignored (local only).
-
-## Never crash
-People trust SolidCraft with their designs; a crash loses their work. **This outranks feature work.**
-- **No panics in non-test code:** no `unwrap()`, `expect()`, `panic!`, `unreachable!`, `todo!`,
-  `unimplemented!`; no `unsafe` (`unsafe_code = "forbid"`).
-- **Errors are `Result<T, E>`** through the crate's error type and `?`. An unfinished feature
-  returns an error ("not supported yet: …"); it never panics.
-- **Input-derived numbers are hostile** (command parameters, design files, control-channel
-  input): `get()` not `[i]`, finite checks, caps on sizes and loop counts.
-- **Third-party kernel calls are guarded:** everything that calls `truck` goes through
-  `solidcraft_kernel::guard`, which turns a panic into `KernelError::Internal`.
-- **Last-resort guard:** `Session::execute` runs every command under `catch_unwind`; an escaped
-  panic restores the design and reports `EngineError::Internal`.
-- **Crash reports:** the desktop app writes every panic and every unclean exit to a local crash folder,
-  with the design and the commands that reproduce it (`solidcraft_engine::crash`, docs/crash-reports.md).
-  When someone says the app crashed, look there first: `solidcraft-cli crashes`, `crashes show <id>`,
-  `crashes replay <id>` (or the `diagnostics.crash_reports` command / MCP `crash_reports` tool).
-- **Prove it:** every crash fix lands with a regression test (see `hostile_params_never_panic`); a
-  crash report's `design.solidcraft` + `replay.json` is the test's starting point.
-- Every production crate root carries
-  `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`.
-
-## Non-negotiables
-- **Independent.** SolidCraft is independent. Behaviour is designed from public documentation,
-  general CAD conventions and user feedback. Reference tests use analytic values and open-source
-  tools. Never copy another product's code, icons, artwork, help text, tooltips, templates or
-  materials. File formats come from public specifications.
-- **No commercial CAD products.** Agents must not drive, script, automate or extract data from
-  commercial CAD products (Fusion, SolidWorks, Onshape, …) for this project: no test data,
-  measurements, command lists, ids or files produced with them.
-- **Never read, copy or link GPL/LGPL/AGPL code**: OpenCASCADE, FreeCAD (incl. planegcs),
-  SolveSpace, CadQuery/OCP, LibreCAD, QCAD — don't even read their sources. (`tools/freecad-oracle/`
-  runs FreeCAD as a separate program through its public scripting API to compute reference values;
-  nothing from FreeCAD is linked, vendored or shipped.) The sketch solver and the blend
-  operations are our own.
-- **Assets — absolutely essential.** SolidCraft contains **no iconography, images, fonts or
-  artwork from commercial CAD products — ever.** Every icon is drawn in code
-  (`crates/ui-egui/src/icons.rs`). Any file asset must be original or openly licensed and **must have a row in ATTRIBUTION.md**
-  (`cargo xtask assets` enforces it). Screenshots of commercial CAD software are never committed.
-  Breaking this rule is the most serious mistake you can make in this repo.
-- **Everything is a command.** User-visible behaviour = a command in `crates/engine/src/cmd/*`
-  (`CommandSpec`: id = our own dotted, lower-case id `<area>.<thing>[.<variant>]` such as
-  `solid.extrude` or `sketch.rectangle.two_point`, never another product's command id; label;
-  toolbar tab and panel; icon; shortcut; params doc; `enabled`; JSON `run`) + tests. The toolbar,
-  dialogs, sketch tools, palette, scripts, CLI and control channel all reach the same commands.
-- **Programmatic calls never open dialogs.** `engine.execute` runs the JSON form; only toolbar
-  clicks (`ui.start`) start interactive tools and dialogs, which then run commands.
-- **Layering** is enforced by `cargo xtask layers`: L0 `geom` → L1 `sketch`, `kernel`, `render`
-  → L2 `doc` → L3 `io` → L4 `engine` → L5 `ui-egui` → apps. Nothing below L5 depends on
-  egui/eframe/winit/wgpu/rfd. **The UI crate is swappable.** Only `crates/kernel` may use `truck`.
-- **The UI is thin**: panels read engine state and act through `app.run(id, params)` /
-  `app.start(id)`. Colours come from `theme::Tokens`.
-- **Rust only.** Units are millimetres and radians internally; Z is up.
-- **Quality gates** before every commit: `cargo xtask ci` (fmt, clippy -D warnings, tests,
-  assets, layers). Commit after every feature arc that builds.
-- **Publishing**: `origin` is github.com/bherbruck/solidcraft. Changes land through **pull requests**:
-  push a branch, open a PR, and let GitHub CI run. Maintainers (and agents working for them) may
-  merge their own PR as soon as CI is green (`gh pr merge --squash`); a trivial fix (docs, typos)
-  may be merged right away. Keep each PR to one topic, rebase or merge `main` into it when it
-  conflicts, and never force-push `main`. Never commit `plan/`, build dirs (`target*/`) or
-  generated reference data; check `git ls-files` before pushing.
-- **Never break wasm**: everything below the apps must build for `wasm32-unknown-unknown`
-  (`cargo xtask wasm`, part of `cargo xtask ci`).
-
-## Application releases
-Development pushes are not application releases. Follow `docs/releasing.md` when asked to
-prepare or ship a release: choose the version from the actual changes, update Cargo.toml and
-Cargo.lock, pass the quality gates, advance `release` without force-pushing, and verify the
-resulting draft and its artifacts. When shipping is authorized, publish that verified draft
-and confirm its tag and downstream deployment. Do not auto-release every push to `main`, infer
-version bumps solely from commit prefixes, overwrite published versions, or push release tags
-before the draft is verified.
-
-## Running and looking at the app
-- `cargo run --release -p solidcraft -- --sample --control PORT` (sample design + control channel).
-  Pick a free port. Without a display, run it under `Xvfb :99` with `DISPLAY=:99`.
-- Drive it with JSON lines on `127.0.0.1:PORT` (see `docs/control-protocol.md`):
-  - `{"id":1,"method":"engine.execute","params":{"command":"solid.extrude","params":{"distance":20}}}`
-  - `{"id":2,"method":"ui.start","params":{"command":"sketch.create"}}` then `ui.click {x, y}`
-  - `{"id":3,"method":"ui.screenshot","params":{"path":"/tmp/shot.png"}}` then read the PNG.
-- **For UI work, look at the result** (screenshot, read the PNG). Without a window use
-  `ui.render` or `solidcraft-cli snapshot`.
-- Headless: `solidcraft-cli run script.json --out part.step`, `solidcraft-cli eval design.solidcraft`,
-  `solidcraft-cli snapshot script.json --out shot.png`, `solidcraft-cli commands`.
-- Reference tests: `cargo xtask oracle` replays `tests/oracle/*/recipe.json` and compares with
-  each case's `expected.json` (analytic or FreeCAD values; writes `docs/oracle.md`). Expected
-  values never come from a commercial CAD product.
-- Build with `CARGO_TARGET_DIR=<repo>/target`. Windows: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solidcraft`.
-
-## Roadmap
-`ROADMAP.md` (committed) tracks status, milestones and estimates. Update it whenever a
-milestone task lands. `cargo xtask features` regenerates `docs/features.md` (SolidCraft's
-commands by area, from the registry) when commands are added or renamed.
+The agent instructions for this repo live in AGENTS.md; edit that file only.

CONTRIBUTING.md

@@ -10,13 +10,19 @@ Help is welcome, whether that's a one-line fix or owning a whole area. This page
 build it, how the code is laid out, the few rules that aren't negotiable, and where help is
 needed most.
 
+Before choosing a task, check the [command inventory](docs/features.md) and
+[roadmap](ROADMAP.md) for implemented capabilities and current priorities.
+
+Questions, ideas or want to say what you're working on? Join the [Discord](https://discord.gg/FtU4NQNVDH).
+
 ## Get it running (about 10 minutes on a fast machine)
 
 You need stable Rust 1.95 or newer (required by egui/eframe 0.36). For the web
-build you also need `rustup target add wasm32-unknown-unknown` and [`trunk`](https://trunkrs.dev).
+build you also need `rustup target add wasm32-unknown-unknown` and [`trunk`](https://github.com/trunk-rs/trunk)
+([documentation](https://trunk-rs.github.io/trunk/)).
 
 ```sh
-git clone https://github.com/bherbruck/solidcraft && cd solidcraft
+git clone https://github.com/tangency-labs/solidcraft && cd solidcraft
 cargo run --release -p solidcraft -- --sample      # desktop app with a sample part
 cargo xtask test                                   # unit, engine and UI-scenario tests
 cargo xtask ci                                     # everything a PR must pass (see below)
@@ -66,7 +72,7 @@ desktop integration and how to distinguish an old executable on `PATH`.
 
 ## How the code is laid out
 
-The [README](README.md#architecture) has the layer table. The short version:
+The [architecture page](docs/architecture.md) has the layer table. The short version:
 
 - `crates/geom`: vectors, planes, meshes, measures.
 - `crates/sketch`: our own constraint solver, plus profile finding.
@@ -98,20 +104,35 @@ The [README](README.md#architecture) has the layer table. The short version:
    MIT OR Apache-2.0, and its solver and blends are written from the maths. (Running an
    open-source application to get reference values for a test is fine; reading its source is
    not.) Permissive
-   dependencies are fine. Note which one you're adding and why in the PR, and run
-   `cargo xtask licences` so THIRD-PARTY-LICENSES.txt lists it (CI checks that it is current).
+   dependencies are fine. Note which one you're adding and why in the PR. THIRD-PARTY-LICENSES.txt
+   lists it once the change lands: the Generated files workflow rewrites it on `main`.
+   Nightly/manual CI also scans advisories, bans and sources with cargo-deny; see
+   [the local command and coverage limits](docs/book/src/dev/testing.md#dependency-advisories).
 3. **Every asset is original or openly licensed and has a row in
    [ATTRIBUTION.md](ATTRIBUTION.md).** Icons are drawn in code (`crates/ui-egui/src/icons.rs`).
    `cargo xtask assets` enforces this.
 4. **Never crash.** People trust a CAD app with their work.
    - Non-test code never uses `unwrap`, `expect`, `panic!` or indexing on input-derived data.
-     There's no `unsafe`, and clippy denies it.
+     There's no `unsafe` outside `apps/solidcraft/src/open_documents.rs` (macOS file-open events),
+     `apps/solidcraft/src/native_crash.rs` (Windows native crash capture) and
+     `crates/threedx-client/src/macos.rs` (the 3Dconnexion driver's client API on macOS), and the
+     compiler denies it.
    - An unsupported case returns an error ("not supported yet: …"); it never panics.
    - Every call into truck goes through `solidcraft_kernel::guard`.
    - Every crash fix comes with a regression test.
 5. **Everything is a command, with a test.** A new feature means a `CommandSpec` in
    `crates/engine/src/cmd/`, engine tests that measure the result (volume, area,
    face/edge/vertex counts against a value you can derive), and for UI work a scenario (below).
+6. **One set of camera controls.** Every page or canvas that shows a view (the modelling
+   viewport, the Render preview, and any new page such as a flat pattern or drawing) calls
+   `navigation::handle` (`crates/ui-egui/src/navigation.rs`) for its camera input, with
+   `NavCaps` saying whether it can orbit (off for flat 2D pages) and pick. New canvases must use
+   `navigation::handle`; never read drags, the wheel or pinch to move the camera yourself. The
+   `hand_rolled_camera_input_is_rejected` test fails if a page does.
+
+Labels, parameter docs, messages and docs use the terms in the
+[glossary](https://docs.solidcraft.io/reference/glossary.html): one term for each idea. A change that adds a new
+idea adds its term there.
 
 [AGENTS.md](AGENTS.md) has the long form of these rules. It's written for AI agents, but it's
 the most complete description of the house style.
@@ -124,6 +145,12 @@ the most complete description of the house style.
 | UI scenarios | `crates/ui-egui/tests/scenarios/*.json` | part of `cargo test` |
 | Reference tests | `cargo xtask oracle` | `tests/oracle/` (see below) |
 
+A geometry change that changes the robustness goldens re-records them in the same pull request:
+`ROBUSTNESS_GOLDENS_BLESS="why it changed" cargo test --profile ci -p solidcraft-engine --lib robustness_goldens::`
+(see [docs/robustness.md](docs/robustness.md)); CI runs every seed on pull requests that touch geometry.
+[docs/mutation-testing.md](docs/mutation-testing.md) shows how to find kernel behaviour these
+black-box suites miss.
+
 **UI scenarios** drive the real app headless: start a tool, click a plane or a sketch point,
 press keys, then assert on the result.
 
@@ -153,41 +180,128 @@ in the PR. `cargo xtask test` builds the tests with it and then runs every test
 `cargo xtask test -- shell`. Tests run beside each other on a busy machine, so a test must not
 depend on wall-clock timing.
 
-**CI shards the tests.** One job builds them into a cargo-nextest archive and four jobs run a
-quarter each, so every test runs in its own process: don't rely on state left by another test.
-Pull requests skip a few heavy tests (one to four minutes each), which run on every push to
-`main` and nightly; check the `main` run after merging. They are listed in
+**Ready pull requests test what they touch.** CI maps changed files to workspace packages and
+runs Clippy, the test build and tests for those and their dependents. The
+[package selector](scripts/ci/affected.py) and [CI workflow](.github/workflows/ci.yml) define
+which changes require native checks; documentation, packaging, other-workflow and bot-script-only
+changes run the repository checks only, on pull requests and on `main`. Workspace-wide changes,
+merge-queue groups, nightly runs and Run workflow select the full workspace. A push to `main`
+reuses a successful merge-queue run for the same commit, and runs only the repository checks
+when no code changed since the last push to `main` that passed; otherwise it runs the full
+suite. Doc tests, reference tests and the Windows jobs run on `main` and nightly only.
+
+**CI shards the tests.** One job builds them into a cargo-nextest archive; two shards run on
+pull requests and four during full validation. Every test runs in its own process: don't rely
+on state left by another test.
+Pull requests skip a few heavy tests (one to twelve minutes each), which run in full validation
+(the merge queue, nightly, manual runs and pushes to `main` not already tested by the queue).
+Check that validation after merging. They are listed in
 `.config/nextest.toml` and the [testing page](docs/book/src/dev/testing.md):
 
-- `solidcraft-engine`: `tests::hostile_params_never_panic`, everything in `tests::robustness`,
+- `solidcraft-engine`: `tests::hostile_params_never_panic`, everything in `tests::robustness` and
+  the seeds of `tests::robustness_goldens` (`seed_00` … `seed_95`; pull requests matching the workflow's geometry paths run all but the slowest, `SLOW_SEEDS` in `ci.yml`),
   `pattern_suppress_tests::enclosure_arc_extinction_keeps_a_real_sharp_inner_lip_after_resize_and_reopen`,
   `pattern_suppress_tests::enclosure_datums_follow_wall_height_and_board_depth_with_material_proofs`,
-  `cmd::plastic::tests::enclosure_snap_fit_follows_resized_front_wall`
-- `solidcraft-kernel`: `tests::boolean_identity_on_tangent_primitives`
+  `cmd::plastic::tests::enclosure_snap_fit_follows_resized_front_wall`, the `atomic_commands` contract tests
+- `solidcraft-kernel`: `tests::boolean_identity_on_tangent_primitives`, `tspline::tests::hostile_tsplines_never_panic`, and the `boolean_props` property tests
+  (these run only in the nightly "Property tests" job: their inputs are random, so main skips them too)
 - `solidcraft-ui-egui` scenarios: `acceptance_sensor_enclosure`
 
-**The reference tests** are 76 parts in [`tests/oracle/`](tests/oracle/), each a `recipe.json`
+**The action matrix** tries every ordinary action on every face, edge, vertex and body of a
+corpus of designs against a checked-in ratchet ([docs/action-matrix.md](docs/action-matrix.md)).
+A pull request that makes an action pass should record it with `cargo xtask action-matrix --bless`;
+one that makes a passing action fail fails the sample every CI run checks.
+
+**The reference tests** live in [`tests/oracle/`](tests/oracle/), each a `recipe.json`
 in our own format with an `expected.json` beside it. SolidCraft rebuilds the recipe and compares
 body count, volume, area, centre of mass and bounding box (and, where there is a `reference.stl`,
 the surface itself). Expected values are either worked out in closed form
 (`tools/oracle-analytic/`) or computed by building the same recipe in FreeCAD, run as a separate
-program (`tools/freecad-oracle/`); each file says which. [docs/oracle.md](docs/oracle.md) has
-the current results, and CI runs `cargo xtask oracle` on every pull request. A case that fails
-because of a known bug names its issue in `expected.json` (`"known_failure": "#123"`); never
-change an expected value to match SolidCraft's output.
+program (`tools/freecad-oracle/`); each file says which. The generated
+[reference test report](docs/oracle.md) has the current case count and results. The reference-test
+CI job runs `cargo xtask oracle` during full validation; pull-request runs skip it. A case that
+fails because of a known bug names its issue in `expected.json` (`"known_failure": "#123"`);
+never change an expected value to match SolidCraft's output.
+
+## Changing the design file format
+
+A design file says which format it is in (`"format": "solidcraft/N"`). If your change saves
+something new in a design (a field, a feature type, a new kind of name), or makes older designs
+mean something else, it needs a format change. **Add one file, and edit nothing shared:**
+
+1. Create `crates/doc/src/format/pending/<what-it-is>.rs` (lowercase, dashes). Start it with a
+   `//!` note: what is saved, what older designs get without it, and that the last release asks
+   for an update instead of meeting it.
+2. If older designs must be rewritten as they open, put `pub fn step(v: &mut Value) ->
+   crate::Result<()>` in the same file. Pending steps run in file-name order, after the older
+   formats' steps.
+3. Don't touch `FORMAT`, `JSON_STEPS`, the history in `crates/doc/src/format.rs`, another
+   change's file, or any `v<N>/` folder: those are fixed once released.
+
+That's all. The build counts the files: while any are pending it writes the next format number,
+which no release reads, so a release refuses a design that has your change instead of losing it.
+A file also lists the pending changes it has (`format_pending`), so a later development build
+runs only the steps that file is missing. Two pull requests that each add a change merge without
+a conflict. `crates/doc/src/format/pending/README.md` has an example.
+
+**At release time** the maintainer runs `scripts/fold-format-pending.sh`, which moves the pending
+files into `crates/doc/src/format/v<N>/` and fixes that number for good (see
+[docs/releasing.md](docs/releasing.md)). Never add a file to a `v<N>/` folder afterwards.
+
+## Lists many changes add to
+
+Some files gain an item in many pull requests at once. They are kept so that two changes that
+each add an item only meet when their items are neighbours, which spares everyone a conflict
+and a fresh CI run:
+
+- **Message catalogs** (`assets/locales/*.json`): one message per line, sorted by id. Add your
+  message anywhere and run `cargo xtask lists --fix`; `cargo xtask lists` (in `cargo xtask ci`
+  and the Lists workflow) fails on an unsorted catalog or an id that appears twice.
+- **`mod` lines**: one per line, in the sorted group they belong to (`cargo fmt` keeps each group
+  sorted). Add a new module into the existing group, not as a new group at the end.
+- **Languages** (`crates/ui-egui/src/i18n.rs`): one per line, English first, then by id (a test
+  checks it).
+- **Generated files**: `THIRD-PARTY-LICENSES.txt` and `docs/features.md` are rewritten on `main`
+  after each merge by the Generated files workflow (`cargo xtask licences`, `cargo xtask
+  features`). Don't regenerate or edit them in a pull request.
+- **Design format**: one file per change, never an edit to a shared number (above).
 
 ## Sending a change
 
-1. Work is tracked in [GitHub issues](https://github.com/bherbruck/solidcraft/issues), labelled
-   by area (`area:kernel`, `area:sketch`, `area:doc`, `area:ui`, `area:infra`). Before starting,
-   comment on the issue so it gets the `in progress` label and two people don't build the same
-   thing. For anything bigger than a bug fix that has no issue yet, open one first.
+1. Work is tracked in [GitHub issues](https://github.com/tangency-labs/solidcraft/issues), labelled
+   by area (`area:kernel`, `area:sketch`, `area:doc`, `area:ui`, `area:infra`). For anything
+   bigger than a bug fix that has no issue yet, open one first. **Claim the issue with a draft
+   PR** before you start, so two people don't build the same thing:
+   - Check nobody has it: `gh pr list -R tangency-labs/solidcraft --state open --search "#N"`.
+   - Branch from the latest `main`, commit `git commit --allow-empty -m "claim: #N"`, push, and
+     open a **draft** PR titled `<summary> (#N)`, e.g. `Fillet: variable radius along a chain (#123)`.
+   - **The lowest-numbered open PR for an issue wins.** If yours lost, close it (or offer to help
+     on the other one).
+   - The bot records the claim when the PR is opened: it assigns you, adds `in progress` and
+     says so on the issue. It reads `#N` in the PR title and `Fixes #N` in the body. If someone
+     already holds the issue, or an older open PR references it, it says so on your PR instead.
+   - Want to stake a claim before you have a branch? Comment `/claim` on the issue (below).
+   - Push work in progress at least daily. A draft with no pushes for 72 hours may be taken over:
+     comment on it first, then open your own claim.
+   - Mark the PR ready for review when it is done.
 2. Branch from `main` and keep the PR to one topic.
 3. Run `cargo xtask ci` before pushing. It runs fmt, the asset, licence and layer checks,
    clippy (`-D warnings`), then the tests with the wasm build check alongside. A PR has to pass it.
+   Heavy CI runs after review: a pull request gets the formatting and repository checks and a
+   quick compile (`cargo check`) when you push. Once a maintainer has reviewed it they add the
+   `approved-for-ci` label when the PR is ready to merge, which runs the full CI (build, tests,
+   goldens, Clippy); every push after that runs the full set again. Maintainers merge approved
+   PRs in groups by area, so PRs that touch the same code meet a conflict at most once.
 4. Reference the issue (`Fixes #12`). In the PR, say what you tested and how. For geometry work, include the measured numbers (and
    the expected ones).
 
+Commenting `/claim` assigns you, adds the `in progress` label, and replies with its automatic cleanup
+deadline. It frees a claim with no linked PR after 72 hours, or a claim with a PR after 14 days
+without pushes. These automatic cleanup deadlines are separate from the daily progress and
+72-hour takeover policy above. A draft PR that references the issue claims it the same way.
+`/unclaim` releases the bot claim early (only you or a maintainer can). Issues a maintainer has
+taken are never freed automatically.
+
 Help reviewers see what the words mean. For observable CAD, UI or model behavior, please
 include actual descriptive screenshots or a short recording in the issue or PR. This evidence
 is required for changes or bugs that can be demonstrated in the app, including kernel,
@@ -202,22 +316,48 @@ Changes with no useful observable behavior do not need screenshot or video evide
 small example without private designs or sensitive details; attach the media or link to an
 accessible recording rather than committing generated review artifacts.
 
-Keep checking upstream commits and the relevant PR's merge status throughout the work and
-before handoff. Integrate upstream merges, resolve conflicts without losing others' changes,
-and validate the integrated result. Before pushing, run `git pull --rebase origin main`, re-run
-CI if it brought changes, and push without force. Report the upstream/PR state you checked,
-any conflicts resolved and validation results. While a task remains active, follow an open
-PR through its status changes; at handoff, clearly identify anything still awaiting merge.
+Keep an eye on your PR's status, but don't push to it only to catch up with `main` (no merge of
+`main`, no Update branch button, no rebase for that alone): every push restarts the whole CI
+run for everyone waiting behind it, and `main`'s own run catches what lands in between. When you
+push a change anyway, or GitHub reports a conflict, rebase onto the latest `main` (push your
+branch with `--force-with-lease`) or merge `main` in once, and resolve conflicts without losing
+others' changes. Don't re-run CI on an unchanged commit either: a real failure fails again.
+Re-run only a job that runner trouble cancelled, with "Re-run failed jobs". While a task remains
+active, follow an open PR through its status changes; at handoff, clearly identify anything
+still awaiting merge.
 
 Much of SolidCraft so far was written by AI coding agents (Claude) working in parallel, each
 owning one area, with a human setting direction and reporting bugs. Their working notes are in
 [AGENTS.md](AGENTS.md). Human contributors are just as welcome. Use whatever tools you like, as
 long as the change meets the rules above.
 
+## Labels and triage
+
+The triage bot labels every new issue and PR (`.github/workflows/triage.yml`). It only adds labels;
+correct them freely and it won't put them back.
+
+- **PRs** get `area:*` from the paths they change (`crates/kernel` and `crates/geom` →
+  `area:kernel`, `crates/ui-egui` and the apps → `area:ui`, `.github/`, `scripts/`, `docs/` →
+  `area:infra`, and so on).
+- **Issues** get `bug` (in-app reports and the bug template), `enhancement` (feature requests),
+  `priority:P1` for crashes, and an `area:*` from the title or the reported command. Until it has
+  a priority, an issue carries `needs-triage`; setting a priority removes it.
+- **Maintainers** comment `/triage area:kernel P1` (any existing label; `P0`–`P3` for a
+  priority, which replaces the old one; `-label` removes one) to sort an issue or PR.
+- **Short bug reports without steps to reproduce** get `needs-info` and one comment asking for
+  the steps (and the version, when it's missing). An app report that arrived empty is asked to
+  paste the report the app copied to the clipboard. The reporter's reply, or an edit that adds the
+  steps, removes the label; an issue that stays in `needs-info` for 14 days is closed, and can be
+  reopened any time. Feature requests, app reports with their details, and maintainers' issues
+  are never asked.
+- `needs-triage` is the queue: [open issues with it](https://github.com/tangency-labs/solidcraft/issues?q=is%3Aopen+label%3Aneeds-triage).
+
 ## Where help is wanted most
 
-See the [`help wanted`](https://github.com/bherbruck/solidcraft/labels/help%20wanted) and
-[`good first issue`](https://github.com/bherbruck/solidcraft/labels/good%20first%20issue) labels.
+**Kernel speed (slow fillets, booleans, STEP):** please don't rewrite the current kernel code for speed; it is being replaced by [solidcore](https://github.com/bherbruck/solidcore) ([progress](https://tangency-labs.github.io/solidcore/)). Report slow cases with a file under the `kernel-perf` label, and put kernel effort into solidcore instead. See [#1597](https://github.com/tangency-labs/solidcraft/issues/1597).
+
+See the [`help wanted`](https://github.com/tangency-labs/solidcraft/labels/help%20wanted) and
+[`good first issue`](https://github.com/tangency-labs/solidcraft/labels/good%20first%20issue) labels.
 In order of how much they'd help users:
 
 1. **Fillet and blend robustness.** Fillets are our own code (truck has no fillet operation).
@@ -226,15 +366,24 @@ In order of how much they'd help users:
    faces, and fillets that consume neighbouring faces.
 2. **Boolean robustness.** A random-design fuzzer currently gets about half of its designs
    through without a kernel error. Each failing seed is a reproducible bug.
-3. **Y-up / Z-up.** SolidCraft is Z-up only, so most STEP files (from SolidWorks, Onshape, or
-   Fusion's default) open lying on their backs. Fusion solves this with a "default modeling
-   orientation" preference.
-4. **Imported appearances.** Colours from STEP files are lost when a feature changes the
-   imported body. They should become design appearances on import.
-5. **Drawings, CAM and mesh tools.** These are out of scope for now (see
+3. **Drawings, CAM and mesh tools.** These are out of scope for now (see
    [ROADMAP.md](ROADMAP.md)), but anyone who wants to own one is welcome.
 
+## Updating the generated feature list
+
+After adding or renaming commands, run `cargo xtask features`. The registry is the
+source of truth for `docs/features.md`; do not hand-edit the generated rows.
+The generator sorts commands by ID and omits global and per-section counters,
+so additions to unrelated areas no longer rewrite shared summary lines.
+
+If two branches still conflict in this file (for example, adjacent additions in
+the same area), first resolve the command registry and source conflicts, then run
+`cargo xtask features` again and stage the regenerated file. Do not use Git's
+`union` merge driver: it can silently retain stale or duplicate command rows.
+The generator tests cover stable ordering and additions that leave existing lines
+unchanged. The initial switch to sorted rows is a one-time larger diff.
+
 ## Licence
 
 By contributing you agree that your contribution is licensed as MIT OR Apache-2.0, like the rest
-of SolidCraft. SolidCraft isn't affiliated with Autodesk. Fusion is a trademark of Autodesk, Inc.
+of SolidCraft. SolidCraft isn't affiliated with any CAD vendor; product names are trademarks of their owners (see NOTICE).

Cargo.toml

@@ -5,7 +5,7 @@ members = ["crates/*", "apps/*", "xtask"]
 exclude = ["vendor"]
 
 [workspace.package]
-version = "0.6.0"
+version = "0.18.0"
 edition = "2024"
 license = "MIT OR Apache-2.0"
 rust-version = "1.95"
@@ -18,18 +18,31 @@ solidcraft-geom = { path = "crates/geom" }
 solidcraft-sketch = { path = "crates/sketch" }
 solidcraft-kernel = { path = "crates/kernel" }
 solidcraft-render = { path = "crates/render" }
+solidcraft-gpu = { path = "crates/gpu" }
 solidcraft-doc = { path = "crates/doc" }
 solidcraft-io = { path = "crates/io" }
 solidcraft-engine = { path = "crates/engine" }
 solidcraft-ui-egui = { path = "crates/ui-egui" }
+solidcraft-space-mouse = { path = "crates/space-mouse" }
 solidcraft-mcp = { path = "crates/mcp" }
+solidcraft-derive = { path = "crates/derive" }
+solidcraft-3dx-client = { path = "crates/threedx-client" }
 
 # foundation
 thiserror = "2"
 serde = { version = "1", features = ["derive", "rc"] }
+# derive macros (crates/derive); already in the tree through serde_derive
+proc-macro2 = "1"
+quote = "1"
+syn = { version = "2", features = ["full"] }
 serde_json = { version = "1", features = ["float_roundtrip"] }
+# command parameter and result schemas
+schemars = "1.2"
+serde_path_to_error = "0.1"
 log = "0.4"
 sha2 = "0.10"
+moxcms = { version = "0.8.1", default-features = false, features = ["extended_range"] }
+semver = "1"
 
 # geometry kernel (Apache-2.0; see plan/adr/0001-geometry-kernel.md). Only crates/kernel uses it.
 truck-modeling = "0.6"
@@ -37,16 +50,43 @@ truck-shapeops = { version = "0.4", default-features = false }
 truck-meshalgo = { version = "0.4", default-features = false, features = ["tessellation", "analyzers"] }
 truck-stepio = { version = "0.3", default-features = false }
 truck-topology = "0.6"
+# constrained Delaunay + Ruppert refinement for trimmed faces (MIT OR Apache-2.0); already in the
+# tree through truck-meshalgo.
+spade = { version = "2.15", default-features = false, features = ["std"] }
+rayon = "1.12"
 
 # packages (3MF)
-zip = { version = "3", default-features = false, features = ["deflate"] }
-quick-xml = "0.38"
+zip = { version = "9", default-features = false, features = ["deflate"] }
+quick-xml = "0.41"
+# STEP text in a legacy encoding (GBK, Shift_JIS, …) instead of Part 21 escapes (#2344): detect
+# and decode it. Both MIT OR Apache-2.0 (encoding_rs adds BSD-3-Clause data); encoding_rs is
+# already in the tree through cadmpeg-codec-step.
+chardetng = "0.1"
+encoding_rs = "0.8"
+# glTF 2.0 import (MIT OR Apache-2.0): the document model and GLB container only; buffers are
+# read by crates/io itself, so no image decoding or file access comes with it.
+gltf = { version = "1.4", default-features = false, features = ["names"] }
+
+# FreeCAD and Rhino import (Apache-2.0, pure Rust apart from zstd; native builds only).
+# Pinned: its IR and codec APIs change between minor versions. Open formats only: no default
+# features, so cadmpeg's codecs for commercial formats (f3d, sldprt, inventor, catia, creo, nx)
+# and its ShapeManager/ACIS `sat` codec are not compiled in. `step` is the writer we restate through.
+cadmpeg-core = "=0.6.1"
+cadmpeg-ir = "=0.6.1"
+cadmpeg-registry = { version = "=0.6.1", default-features = false, features = ["fcstd", "rhino", "step"] }
 
 # fonts (sketch text outlines; MIT OR Apache-2.0, pure Rust)
 ttf-parser = { version = "0.25", default-features = false, features = ["std"] }
 
 # images
-image = { version = "0.25", default-features = false, features = ["png"] }
+image = { version = "0.25", default-features = false, features = ["png", "hdr"] }
+png = "0.18.1"
+# LZW for GIF animations (MIT OR Apache-2.0, pure Rust; already in the tree through image's tiff).
+weezl = "0.1.12"
+# rasterises the UI icon SVGs (BSD-3-Clause, pure Rust, builds for wasm)
+tiny-skia = { version = "0.12", default-features = false, features = ["std", "simd"] }
+# build scripts: reads the icon palette (MIT OR Apache-2.0)
+toml = "1"
 
 # ui
 egui = "0.36"
@@ -54,6 +94,10 @@ eframe = { version = "0.36", default-features = false, features = ["persistence"
 # Instant/SystemTime that also work in the browser (std panics on wasm32-unknown-unknown).
 web-time = "1"
 egui-wgpu = "0.36"
+# the wgpu egui-wgpu uses, for compute (crates/gpu); backends come from the apps' features
+wgpu = { version = "30", default-features = false, features = ["std", "wgsl"] }
+naga = { version = "30", default-features = false }
+pollster = "0.4"
 rfd = "0.17"
 
 [workspace.lints.rust]
@@ -87,6 +131,9 @@ incremental = false
 
 [profile.ci.package."*"]
 opt-level = 2
+# No line tables for dependencies: they were over a third of the test archive every CI shard
+# downloads. Our own crates keep theirs, so a backtrace still names file:line in them.
+debug = false
 
 [profile.release]
 opt-level = 3
@@ -98,6 +145,7 @@ debug = "line-tables-only"
 
 # truck-shapeops with SolidCraft fixes (Apache-2.0, see vendor/truck-shapeops and ATTRIBUTION.md).
 [patch.crates-io]
+truck-geometry = { path = "vendor/truck-geometry" }
 truck-shapeops = { path = "vendor/truck-shapeops" }
 truck-stepio = { path = "vendor/truck-stepio" }
 truck-meshalgo = { path = "vendor/truck-meshalgo" }
@@ -105,3 +153,9 @@ matext4cgmath = { path = "vendor/matext4cgmath" }
 
 # Keep OpenGL pipelines, resolve textures and CAD callbacks at the same safe sample count.
 egui-wgpu = { path = "vendor/egui-wgpu" }
+
+# Mutation testing (cargo-mutants, docs/mutation-testing.md): the ci profile with incremental
+# builds, since every mutant rebuilds the crates above the one it changes.
+[profile.mutants]
+inherits = "ci"
+incremental = true

NOTICE

@@ -19,10 +19,18 @@ licensed MIT OR Apache-2.0; ATTRIBUTION.md lists the files.
 The release packaging (.github/workflows/release.yml, packaging/) is adapted from PhotoCraft
 (https://github.com/storytold/photocraft), licensed under the Apache License 2.0.
 
+The incremental Radiance RGBE row adapter in crates/render/src/lighting/hdr.rs adapts
+decoding state machines from image 0.25.10 (https://github.com/image-rs/image),
+MIT OR Apache-2.0. ATTRIBUTION.md describes the bounded/cancellable changes; the
+original licence texts are included in THIRD-PARTY-LICENSES.txt.
+
 Most bundled assets are drawn in code or contributed originally; third-party fonts (Liberation Sans
 for sketch text, BIZ UDPGothic for web Japanese display) are licensed under SIL OFL 1.1. The
 per-file list is in ATTRIBUTION.md.
 
 SolidCraft is an independent project and is not affiliated with, sponsored by or endorsed by
-Autodesk, Inc. Autodesk and Fusion are trademarks of Autodesk, Inc.; they are used here only to
-describe compatibility goals.
+Autodesk, Dassault Systèmes, PTC, Siemens, Blender or any other CAD vendor. Fusion, AutoCAD,
+Inventor, Alias and Tinkercad are trademarks of Autodesk, Inc.; SolidWorks is a trademark of
+Dassault Systèmes; Onshape and Creo are trademarks of PTC; Blender is a trademark of the Blender
+Foundation. Product names appear only to describe compatibility, such as the mouse navigation
+presets in Preferences › Navigation and file formats from public specifications.

README.md

@@ -1,16 +1,17 @@
-# SolidCraft
+<p align="center">
+  <img src="assets/icons/app/linux/exports/hicolor/256x256/apps/ai.storyteller.solidcraft.png" width="96" height="96" alt="SolidCraft" />
+</p>
 
-**An open-source parametric 3D CAD application built in pure Rust.**
+<h1 align="center">SolidCraft</h1>
 
-Sketch, constrain, and build solids with a parametric feature timeline. Change a dimension
-and watch your model rebuild. Run it on your desktop, in your browser, or let AI agents
-model through the built-in MCP server.
+<p align="center">
+  <strong>An open-source parametric 3D CAD application built in pure Rust.</strong><br />
+  Sketch, constrain, and build solids with a parametric feature timeline. Change a dimension
+  and watch your model rebuild. Run it on your desktop, in your browser, or let AI agents
+  model through the built-in MCP server.
+</p>
 
-![SolidCraft: draw a rounded electronics enclosure, sketch its USB port directly on a face, add four mounting bosses and resize it through Parameters](docs/screenshots/enclosure-demo-0.2.1.gif)
-
-*Start with an empty design and draw the original parametric electronics enclosure in the English desktop UI: rounded corners, a shell, a USB port sketched directly on the wall and a four-boss pattern. Change width from 80 → 100 mm and wall thickness from 2 → 3 mm in Parameters and watch it rebuild. Original animated pointer and click cues; 4× playback. [Full video](https://github.com/bherbruck/solidcraft/raw/refs/heads/main/docs/screenshots/enclosure-demo-0.2.1.mp4), generated with the [demo script](examples/demo/record_ui.sh).*
-
-## Download
+<div align="center">
 
 [![Download for Windows][badge-windows]][windows-msi]
 [![Download for macOS][badge-macos]][macos-dmg]
@@ -18,205 +19,126 @@ model through the built-in MCP server.
 [![Get it from the Snap Store][badge-snap]][snap-store]
 [![Try it in your browser][badge-web]][web-app]
 
-- **Windows:** download and run the [installer][windows-msi].
-  Also for [ARM64][windows-arm64-msi] and [32-bit][windows-x86-msi] PCs, or as a
-  [portable zip][windows-portable] that runs without installing.
-- **macOS:** open the [disk image][macos-dmg] and drag SolidCraft into Applications
-  (Apple silicon and Intel).
-- **Linux:** download the [AppImage][linux-appimage], allow it to run as a program and open it.
-  Or install the [.deb][linux-deb] (Ubuntu, Debian, Mint) or [.rpm][linux-rpm] (Fedora,
-  openSUSE), or use [Flatpak](https://bherbruck.github.io/solidcraft/guide/getting-started.html#linux-flatpak).
-  With Snap: `sudo snap install solidcraft` ([Snap Store][snap-store], or the [.snap file][linux-snap]).
-  For ARM64: [AppImage][linux-arm64-appimage], [.deb][linux-arm64-deb], [.rpm][linux-arm64-rpm].
+</div>
+
+<p align="center">
+  <a href="https://solidcraft.io">Website</a> ·
+  <a href="https://solidcraft.io/download">Download</a> ·
+  <a href="https://solidcraft.io/app">Try it in the browser</a> ·
+  <a href="https://docs.solidcraft.io/">Documentation</a> ·
+  <a href="https://www.blacksmith.sh"><img src="https://img.shields.io/badge/CI-Blacksmith-000000?logo=githubactions&logoColor=white" alt="CI powered by Blacksmith" /></a>
+  <a href="https://discord.gg/FtU4NQNVDH">Discord</a> ·
+  <a href="https://github.com/bherbruck/solidcore">SolidCore</a>
+</p>
+
+<p align="center">
+  <a href="https://github.com/tangency-labs/solidcraft/actions/workflows/ci.yml?query=branch%3Amain"><img src="https://github.com/tangency-labs/solidcraft/actions/workflows/ci.yml/badge.svg?branch=main" alt="CI" /></a>
+  <a href="https://github.com/tangency-labs/solidcraft/releases/latest"><img src="https://img.shields.io/github/v/release/tangency-labs/solidcraft?label=release" alt="Latest release" /></a>
+  <a href="https://github.com/tangency-labs/solidcraft/releases"><img src="https://img.shields.io/github/downloads/tangency-labs/solidcraft/total?label=downloads" alt="Downloads" /></a>
+  <a href="LICENSE"><img src="https://img.shields.io/github/license/tangency-labs/solidcraft" alt="Licence" /></a>
+  <a href="https://discord.gg/FtU4NQNVDH"><img src="https://img.shields.io/badge/Discord-join-5865F2?logo=discord&logoColor=white" alt="Discord" /></a>
+  <a href="https://remade.wiki/projects/solidcraft/"><img src="https://remade.wiki/badges/listed-on-remade-classic.svg" alt="Listed on Remade" /></a>
+  <a href="https://github.com/tangency-labs/solidcraft/stargazers"><img src="https://img.shields.io/github/stars/tangency-labs/solidcraft?style=flat" alt="Stars" /></a>
+</p>
+
+<p align="center">
+  <a href="https://trendshift.io/repositories/296178?utm_source=trendshift-badge&amp;utm_medium=badge&amp;utm_campaign=badge-trendshift-296178" target="_blank" rel="noopener noreferrer"><img src="https://trendshift.io/api/badge/trendshift/repositories/296178/daily" alt="tangency-labs%2Fsolidcraft | Trendshift" width="250" height="55"/></a>
+  <a href="https://trendshift.io/repositories/296178?utm_source=trendshift-badge&amp;utm_medium=badge&amp;utm_campaign=badge-trendshift-296178" target="_blank" rel="noopener noreferrer"><img src="https://trendshift.io/api/badge/trendshift/repositories/296178/daily?language=Rust" alt="tangency-labs%2Fsolidcraft | Trendshift (Rust)" width="250" height="55"/></a>
+</p>
+
+![SolidCraft 0.8: model a Raspberry Pi 4 case from an empty design: a sketch dimensioned with parameters, extrude, fillets and shell, a rim rounded in one pick, standoffs patterned on the board's mounting holes, port cut-outs, vent slots, "Pi 4" engraved in a font, a PETG material with its mass in Properties, and a height change in Parameters](docs/screenshots/demo-0.8.gif)
+
+*A Raspberry Pi 4 case from an empty design: a sketch dimensioned with the board's parameters, extrude, fillet, shell, the rim rounded in one pick, an M2.5 standoff patterned on the 58 × 49 mm hole rectangle, port cut-outs, vent slots, "Pi 4" engraved in DejaVu Sans Bold and a PETG material defined in the design, with its mass in Properties, then height 24 → 32 mm in Parameters and it all rebuilds. 9× playback. [Full video](https://github.com/tangency-labs/solidcraft/raw/refs/heads/main/docs/screenshots/demo-0.8.mp4), recorded with the [demo script](examples/demo/record_ui.sh).*
+
+## Download
+
+- **Windows:** the [installer][windows-msi], or `winget install bherbruck.SolidCraft`.
+- **macOS:** the [disk image][macos-dmg] (Apple silicon and Intel).
+- **Linux:** the [AppImage][linux-appimage], or `sudo snap install solidcraft` ([Snap Store][snap-store]).
 - **Web:** [try it in your browser][web-app], no install.
 
-The downloads aren't signed yet. On Windows, if SmartScreen warns you, choose **More info**, then
-**Run anyway**. On macOS, the first time, right-click SolidCraft in Applications and choose **Open**.
+ARM64 and 32-bit builds, portable zip, .deb, .rpm, Flatpak and the other packages are on the
+[downloads page](docs/downloads.md). The downloads aren't signed yet: on Windows choose
+**More info**, then **Run anyway** in SmartScreen; on macOS right-click SolidCraft and choose **Open**
+the first time. On SolidCraft 0.11 to 0.14, download once by hand; see
+[updating](https://docs.solidcraft.io/guide/updates.html#updating-from-011-to-014).
 
-Older versions, checksums and other formats are on the [releases page](https://github.com/bherbruck/solidcraft/releases).
-Install details, upgrading from earlier builds and building from source are in
-[Getting started](https://bherbruck.github.io/solidcraft/guide/getting-started.html).
+## What works
+
+Early but usable for simple parts: 75 of 76 public reference parts match their analytic or
+FreeCAD-computed volume, area, centre of mass and bounding box ([oracle](docs/oracle.md)); the
+other is a tracked bug.
+
+- **Sketches and constraints:** lines, arcs, splines, text and more, solved by our own constraint solver, with parameter-driven dimensions.
+- **Features:** extrude, revolve, sweep, loft, fillet, chamfer, shell, draft, holes, threads, patterns, mirror, split and combine on an editable parametric timeline.
+- **Parameters and configurations** with unit-aware expressions.
+- **Assemblies** with joints, motion studies, contact sets, interference and mass properties.
+- **Sheet metal** with flanges, hems, fold/unfold and flat patterns, and plastic enclosure features.
+- **Files:** STEP, IGES, 3MF, STL, OBJ and glTF in and out where supported, URDF export, `.solidcraft` designs.
+- **Desktop app, browser app, headless CLI and MCP server**, all running the same commands.
+
+The full list is in [docs/capabilities.md](docs/capabilities.md) and [docs/features.md](docs/features.md);
+status and plans are in [ROADMAP.md](ROADMAP.md). See also [what people built](docs/showcase.md),
+[3D mouse support](docs/3d-mouse.md) and the [architecture](docs/architecture.md).
+
+## Build from source
+
+```sh
+cargo run --release -p solidcraft -- --sample      # desktop app with a sample part
+cargo run --release -p solidcraft-cli -- commands  # the command registry
+cargo run --release -p solidcraft-cli -- run examples/bracket.json --out bracket.step
+cargo xtask ci                                     # fmt, clippy, tests, icons, assets, layers, wasm
+```
+
+More commands, the Windows cross-build and the browser build are in [docs/building.md](docs/building.md).
+
+## AI agents (MCP)
+
+`solidcraft-cli mcp` is a [Model Context Protocol](https://modelcontextprotocol.io) server. Headless it
+runs its own design session, or with `--connect` it drives the running app so you can watch.
+Claude Code: `claude mcp add solidcraft -- solidcraft-cli mcp`. Tools, access rules and an
+example session: [docs/mcp.md](docs/mcp.md).
+
+## Scripts
+
+A script is a JSON list of the same commands the UI runs, executed with `solidcraft-cli run`.
+Format and example: [docs/scripts.md](docs/scripts.md). Pages can also be driven through the
+[browser command API](docs/browser-api.md).
+
+## Contributing
+
+Help is welcome. [CONTRIBUTING.md](CONTRIBUTING.md) covers how to build and test, the code map,
+the clean-room and licence rules, and where help is wanted most. Open work is in
+[GitHub issues](https://github.com/tangency-labs/solidcraft/issues); chat is on
+[Discord](https://discord.gg/FtU4NQNVDH).
+
+## Sponsors
+
+[![CI powered by Blacksmith](docs/sponsors/blacksmith-ci-powered.png)](https://www.blacksmith.sh)
+
+SolidCraft's continuous integration runs on [Blacksmith](https://www.blacksmith.sh), which
+sponsors its CI minutes.
+
+## Licence
+
+MIT OR Apache-2.0, at your option. Developed under the
+[clean-room contribution rules](AGENTS.md); third-party code and assets retain their
+documented licences and attribution.
+
+SolidCraft is independent. Behaviour is designed from public documentation, general CAD
+conventions and user feedback. Reference tests use analytic values and open-source tools.
+SolidCraft is not affiliated with, sponsored by or endorsed by Autodesk, Dassault Systèmes, PTC,
+Siemens or any other CAD vendor. Fusion, AutoCAD, Inventor, SolidWorks, Onshape, Creo, Blender and
+Tinkercad are trademarks of their respective owners, named only to describe compatibility
+(see [NOTICE](NOTICE)).
 
 [badge-windows]: https://img.shields.io/badge/Windows-Download-0078D6?style=for-the-badge&logo=data%3Aimage%2Fsvg%2Bxml%3Bbase64%2CPHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0id2hpdGUiPjxwYXRoIGQ9Ik0yIDJoOS41djkuNUgyek0xMi41IDJIMjJ2OS41aC05LjV6TTIgMTIuNWg5LjVWMjJIMnpNMTIuNSAxMi41SDIyVjIyaC05LjV6Ii8%2BPC9zdmc%2B
 [badge-macos]: https://img.shields.io/badge/macOS-Download-333333?style=for-the-badge&logo=apple&logoColor=white
 [badge-linux]: https://img.shields.io/badge/Linux-AppImage-E95420?style=for-the-badge&logo=linux&logoColor=white
 [badge-snap]: https://img.shields.io/badge/Snap-Snap_Store-82BEA0?style=for-the-badge&logo=snapcraft&logoColor=white
 [badge-web]: https://img.shields.io/badge/Web-Try_in_browser-2EA44F?style=for-the-badge&logo=data%3Aimage%2Fsvg%2Bxml%3Bbase64%2CPHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJ3aGl0ZSIgc3Ryb2tlLXdpZHRoPSIyIj48Y2lyY2xlIGN4PSIxMiIgY3k9IjEyIiByPSIxMCIvPjxwYXRoIGQ9Ik0yIDEyaDIwTTEyIDJhMTUgMTUgMCAwIDEgMCAyME0xMiAyYTE1IDE1IDAgMCAwIDAgMjAiLz48L3N2Zz4%3D
-[windows-msi]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-windows-x64.msi
-[windows-arm64-msi]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-windows-arm64.msi
-[windows-x86-msi]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-windows-x86.msi
-[windows-portable]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-windows-x64-portable.zip
-[macos-dmg]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-macos-universal.dmg
-[linux-appimage]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-x86_64.AppImage
-[linux-deb]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-x86_64.deb
-[linux-rpm]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-x86_64.rpm
-[linux-arm64-appimage]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-aarch64.AppImage
-[linux-arm64-deb]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-aarch64.deb
-[linux-arm64-rpm]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-aarch64.rpm
-[linux-snap]: https://github.com/bherbruck/solidcraft/releases/latest/download/solidcraft-linux-x86_64.snap
+[windows-msi]: https://github.com/tangency-labs/solidcraft/releases/latest/download/solidcraft-windows-x64.msi
+[macos-dmg]: https://github.com/tangency-labs/solidcraft/releases/latest/download/solidcraft-macos-universal.dmg
+[linux-appimage]: https://github.com/tangency-labs/solidcraft/releases/latest/download/solidcraft-linux-x86_64.AppImage
 [snap-store]: https://snapcraft.io/solidcraft
-[web-app]: https://bherbruck.github.io/solidcraft/app/
-
-**Documentation:** the [SolidCraft book](https://bherbruck.github.io/solidcraft/) (user guide,
-developer guide and command reference; sources in [docs/book](docs/book)).
-
-**Status: early but usable for simple parts.** 75 of 76 public reference parts
-match their analytic or FreeCAD-computed volume, area, centre of mass and bounding box
-([docs/oracle.md](docs/oracle.md)); the other is a tracked bug.
-These checks do not establish complete geometric or workflow equivalence. The commands SolidCraft has
-are listed by area in [docs/features.md](docs/features.md); status and plans are in [ROADMAP.md](ROADMAP.md).
-Open work and known bugs are in [GitHub issues](https://github.com/bherbruck/solidcraft/issues),
-and help is welcome: see [CONTRIBUTING.md](CONTRIBUTING.md).
-
-## What works
-
-- **Sketches** on origin planes, offset planes or planar faces: lines, rectangles, circles,
-  arcs, polygons, slots, ellipses, fit/control splines, conics and text; construction geometry,
-  projection, trimming, fillets and chamfers, including corners at the origin.
-  New face attachments retain supported construction identities and chosen occurrences;
-  missing sources expose an explicit plane repair workflow. See [face attachments](docs/face-attachments.md).
-  Explicitly closed fit splines and closed associative offsets use periodic C2 interpolation.
-  Supported convex line-and-arc offsets retain their identity when an inset consumes corner
-  arcs, and linked extrusions follow the current boundary. Breaking the association freezes
-  the boundary and keeps existing extrusions usable.
-  Curve drawing and picking adapt together to zoom and display scale, including small circles
-  at Fit and sketches in placed components.
-- **Constraints and dimensions** solved by our own solver (damped Gauss–Newton with
-  degree-of-freedom analysis): coincident, horizontal/vertical, parallel, perpendicular, tangent,
-  equal, concentric, collinear, midpoint, symmetry, fix; linear, aligned, horizontal, vertical,
-  radius, diameter and angle dimensions driven by parameters. Over-constraining edits are
-  rejected; fully constrained geometry turns black.
-  Select a line or its two endpoints, type its dimension and press Enter to commit one undo
-  step. Fit keeps sketch geometry clear of the palette and navigation controls.
-- **Profiles** found automatically, including regions split by lines and holes inside outlines.
-  Newly captured complete adaptive boundaries retain their outer and hole source identities
-  when spline span counts change. Partial or ambiguous boundaries do not qualify.
-- **Features** on a parametric timeline: extrude, revolve, sweep, loft, fillet/chamfer,
-  shell, draft, holes, threads, patterns, mirror, split, combine, move and construction geometry.
-  The timeline rebuilds incrementally; features can be edited, suppressed, renamed, reordered
-  and deleted. Supported geometry and current limitations are described in [ROADMAP.md](ROADMAP.md).
-  New revolves preserve symmetric and two-sided angular placement across reversed axes;
-  older designs retain their saved convention when reopened or edited.
-- **Parameters and configurations** with unit-aware expressions (`2 * width + 5 mm`,
-  `angle / 2`), ordered rules, feature suppression and per-row body materials/appearances.
-- **Assemblies** with nested components and occurrences, joints, motion studies, contact sets,
-  interference and material-aware mass properties. Recorded body transfers preserve modelling
-  history and world placement; 3D sketch wires retain their coordinate frames through edits.
-- **Sheet metal** with flanges, hems, fold/unfold/refold, material cutouts, flat patterns,
-  retained shallow prismatic pockets, exact line/arc/circle DXF outlines and bend tables;
-  plastic enclosure features and rules. Pocket depth and side survive unfold/refold and appear
-  separately from through-hole outlines in the flat preview and DXF.
-- **Files**: design containers (`.solidcraft`) with lossless binary mesh payloads;
-  plain JSON remains supported for opening, Save As and export. Desktop Open can show a saved
-  experimental preview (explicit `preview: true` engine saves) while checking geometry before editing. Export to STEP (AP242 with body names, colours and
-  components as assemblies; revolved faces as native planes, cylinders, cones, spheres and tori),
-  IGES 5.3 (manifold solid B-reps with names and colours), 3MF, STL (binary/ASCII) and OBJ;
-  3MF, STL and OBJ import as mesh bodies (they render, measure, move and export; solid features
-  need B-rep bodies). Convert Mesh reconstructs supported closed constant-section parts
-  as parametric solids with planar and circular cylindrical faces;
-  STEP import (AP203/AP214/AP242 solids, assemblies, units, names, colours) and IGES import
-  (manifold solid B-reps, or trimmed and bounded surfaces sewn into solids) as a base feature
-  that later features build on — open a `.step`/`.stp`/`.igs`/`.iges` file, insert one into a
-  design, or drop it on the window ([docs/step-import.md](docs/step-import.md)).
-- **Desktop app** (egui + wgpu): toolbar with workspace tabs, browser, timeline, 3D viewport with
-  axis view and navigation bar, sketch tools, feature dialogs, command palette, and a JSON-lines
-  control channel so agents and tests can drive it.
-  Feature errors and Help can open an editable **Create Issue** draft with relevant context
-  and an optional reviewed screenshot; opening GitHub does not submit the report.
-- **Headless CLI** `solidcraft-cli`: run command scripts, measure (volume, area, centre of mass,
-  face/edge/vertex counts), export, render PNG snapshots and replay reference recipes.
-- **MCP server** `solidcraft-cli mcp`: AI agents model, measure and look at parts headless or
-  in the running app (see below).
-
-## Build and run
-
-```sh
-cargo run --release -p solidcraft -- --sample          # desktop app with a sample part
-cargo run --release -p solidcraft-cli -- commands      # the command registry
-cargo run --release -p solidcraft-cli -- run examples/bracket.json --out bracket.step
-cargo run --release -p solidcraft-cli -- snapshot examples/bracket.json --out bracket.png
-cargo run --release -p solidcraft -- part.step          # open a STEP file as a new design
-cargo run --release -p solidcraft-cli -- eval part.step # measure an imported STEP file
-cargo xtask ci                                          # fmt, clippy, tests, assets, layers, wasm
-```
-
-Windows builds: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solidcraft`.
-
-On Windows and Linux, SolidCraft detects a connected 3Dconnexion SpaceNavigator or SpaceMouse through its
-multi-axis HID interface. Move the cap to pan and zoom, and tilt or twist it to rotate the 3D view.
-While editing a sketch, the cap pans and zooms without changing the sketch view. The Navigation
-page in Preferences has an on/off switch and a speed control for the 3D mouse.
-
-On Linux SolidCraft reads `/dev/hidrawN` directly, so the logged-in user needs access to the
-device. A udev rule that adds the `uaccess` tag does that, for example
-`/etc/udev/rules.d/70-3d-mouse.rules` for devices with 3Dconnexion's vendor id:
-
-```
-SUBSYSTEM=="hidraw", ATTRS{idVendor}=="256f", TAG+="uaccess"
-```
-
-Older SpaceNavigators use Logitech's vendor id `046d`; add a rule with their product id (see `lsusb`)
-instead of matching every Logitech device. Reload with `sudo udevadm control --reload && sudo udevadm trigger`, then replug the device. The Flatpak
-sandbox does not expose hidraw devices, so the 3D mouse only works with native builds there for now.
-Devices that send all six axes in HID report 1 (some homemade ones do) are recognised from their
-report descriptor, so they work as well.
-
-In the browser: `cd apps/solidcraft-web && trunk build --release --public-url ./` (WebGPU, or
-WebGL2 with `?webgl`; `?sample` opens the sample part).
-
-## Scripts
-
-A script is a JSON list of commands, the same ones the UI runs:
-
-```json
-{"commands": [
-  {"command": "sketch.create", "params": {"plane": "XY"}},
-  {"command": "sketch.rectangle.two_point", "params": {"p0": [0, 0], "p1": [40, 30]}},
-  {"command": "solid.extrude", "params": {"distance": 20}},
-  {"command": "solid.fillet", "params": {"edges": [[0, 0, 10]], "radius": 3}}
-]}
-```
-
-## AI agents (MCP)
-
-`solidcraft-cli mcp` is a [Model Context Protocol](https://modelcontextprotocol.io) server on
-stdio. Headless it runs its own design session; with `--connect 127.0.0.1:PORT` it drives the app
-started with `solidcraft --control PORT`, so you can watch the agent model. Tools:
-`list_commands`, `execute`, `batch`, `inspect_design`, `measure`, `body_topology`,
-`set_parameter`, `screenshot` (returns the image), `export`, `undo`, `redo`, `new_design`, `open`,
-`save`. Claude Code: `claude mcp add solidcraft -- solidcraft-cli mcp`. Details, client
-configuration and an example session: [docs/mcp.md](docs/mcp.md).
-
-## Architecture
-
-<!-- ANCHOR: architecture -->
-| Layer | Crates | Role |
-|---|---|---|
-| L0 | `geom` | vectors, planes, profiles, meshes and their measures |
-| L1 | `sketch`, `kernel`, `render` | constraint solver and profiles; the B-rep kernel boundary (truck); view math and CPU rasterizer |
-| L2 | `doc` | parameters, expressions, the feature timeline and its incremental evaluation |
-| L3 | `io` | design files, STL/OBJ/STEP/3MF export, STEP and 3MF/STL import features |
-| L4 | `engine` | the session and the command registry (everything is a command) |
-| L5 | `ui-egui`, `mcp` | the swappable desktop front end; the MCP server (headless or bridged to the app) |
-| apps | `solidcraft`, `solidcraft-cli` | desktop app, headless CLI |
-<!-- ANCHOR_END: architecture -->
-
-## Contributing
-
-Coming from Autodesk Fusion? SolidCraft uses familiar parametric CAD workflows: constrained
-sketches, solid features, an editable timeline, parameters and assemblies. See the
-[roadmap](ROADMAP.md) for supported operations and current limitations.
-
-See [CONTRIBUTING.md](CONTRIBUTING.md): how to build and test, the code map, the clean-room
-and licence rules, and where help is wanted most.
-
-## Licence
-
-MIT OR Apache-2.0, at your option. Developed under the
-[clean-room contribution rules](CLAUDE.md); third-party code and assets retain their
-documented licences and attribution.
-
-SolidCraft is independent. Behaviour is designed from public documentation, general CAD
-conventions and user feedback. Reference tests use analytic values and open-source tools.
-SolidCraft is not affiliated with, sponsored by or endorsed by Autodesk. Autodesk and
-Fusion are trademarks of Autodesk, Inc.
+[web-app]: https://solidcraft.io/app

ROADMAP.md

@@ -1,19 +1,23 @@
 # SolidCraft roadmap
 
-Status as of **2026-10-11**. SolidCraft supports parametric modelling (sketch →
+Status as of **2026-10-14**. SolidCraft supports parametric modelling (sketch →
 features → parametric timeline) as an open, pure-Rust, agent-drivable application.
 
 ## At a glance
 
 | Question | Answer |
 |---|---|
-| Where are we? | **M0 and M13 done; M1, M2, M5–M7, M9, M10, M14 in progress.** Sketch with solver and the full SKETCH create/modify set; extrude, revolve (two sides, symmetric, to object), fillet/chamfer (variable radius, chord length, a radius per edge, corner patches), holes, threads (cosmetic and modelled), patterns, mirror, shell (inside/outside/both), draft, loft, sweep, coil, split body and split face, delete face, construction planes, axes and points; persistent naming of faces and edges; parameters and configurations; components, joints, motion studies, exploded views; sheet metal and a plastic enclosure subset; STEP/IGES/3MF/STL/OBJ/DXF; autosave and crash recovery; desktop and browser (wasm) app, CLI, MCP server. |
+| Where are we? | **M0 and M13 done; M1, M2, M5–M7, M9, M10, M14 in progress.** Sketch with solver and the full SKETCH create/modify set; extrude, revolve (two sides, symmetric, to object), fillet/chamfer (variable radius, chord length, a radius per edge, corner patches), holes, threads (cosmetic and modelled), patterns, mirror, shell (inside/outside/both), draft, loft, sweep, coil, split body and split face, delete face, construction planes, axes and points; persistent naming of faces and edges; parameters and configurations; components, joints, motion studies, exploded views; sheet metal and a plastic enclosure subset; STEP/IGES/3MF/STL/OBJ/DXF; FreeCAD/Rhino import; autosave and crash recovery; desktop and browser (wasm) app, CLI, MCP server. |
 | Features | Every registered command by area — [docs/features.md](docs/features.md) (`cargo xtask features`); registry breadth does not establish workflow or geometric depth |
-| Reference tests | **76 / 76 parts match** — [docs/oracle.md](docs/oracle.md): public cases in `tests/oracle/` with analytic (55) or FreeCAD-computed (21) expected values, run by CI on every PR. |
+| Reference tests | [Current case count and results](docs/oracle.md): public cases in `tests/oracle/` with analytic or FreeCAD-computed expected values, checked by the reference-test job in [CI](.github/workflows/ci.yml). |
 | Tests | Solver, profiles, kernel booleans/blends/measures, expressions, timeline, persistent naming, file formats and migrations, assemblies, sheet metal, engine end-to-end, hostile-input fuzz over every command and headless UI scenarios. `cargo xtask ci` reports the current passing counts. |
 | Gates | `cargo xtask ci`: fmt, clippy -D warnings, tests, asset attribution, layering, wasm32 build — green |
 | Time to a useful alpha (M0–M6) | ≈ **82 agent hours** remain (sum of the M1–M6 estimates below) |
 
+Optional GPU viewport ambient occlusion is available in View settings and Graphics preferences,
+with persistent settings, Performance/Quality graphics presets (Quality combines AO, Fine tessellation and adaptive 2× supersampling; manual combinations show Custom), and the
+`view.ambient_occlusion` and `view.graphics_preset` commands. See [display settings](docs/ambient-occlusion.md).
+
 ## Scope (owner decision, 2026-10-07)
 
 The issue batch adds preservation of blind pockets in through cuts, associative projected
@@ -21,6 +25,8 @@ offsets and plastic face placements, XZ (+Y normal) with a v6 migration preservi
 designs, interactive angle placement, file-picker sketch imports, Home/recent controls,
 toolbar overflow, and the remaining component-frame and assembly WIP work. The enclosure
 acceptance scenarios now include board resizes; STEP reopening is automated. See [WIP reconciliation](docs/wip-reconciliation.md).
+Face-based Extrude Join (including outward Press Pull) now defaults to the picked body,
+so edge-touching assembly neighbours stay separate regardless of body order (#226).
 
 In scope, in priority order:
 1. SOLID and SKETCH (now).
@@ -36,7 +42,7 @@ In scope, in priority order:
    metal rules (thickness, K-factor, bend radius) (M10).
 5. A small PLASTIC subset for enclosures, after sheet metal: Boss, Rib, Web, Lip/Groove, Snap Fit.
 
-Deferred until further notice: MESH, FORM (T-splines), SURFACE beyond what solids need, PCB / 3D
+Deferred until further notice: MESH, FORM (T-splines), SURFACE beyond what solids need (scope proposed in #772), PCB / 3D
 PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## Milestones
@@ -44,32 +50,175 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 | # | Milestone | Status | Hours left |
 |---|---|---|---|
 | M0 | Vertical slice | done | — |
-| M1 | Sketch depth: command coverage implemented — projection/intersect/include as linked geometry (auto-project on faces, lost-reference warnings, break link), full SKETCH create/modify set (slots, polygons, tangent arcs/circles, ellipse, fit/control splines, conic, text, trim/extend/break, fillet/chamfer, offset, mirror, patterns, move/scale, blend curve, centerline), constraints incl. curvature and polygon with over-constraint refusal, driven/arc-length/linear-diameter dimensions, AutoConstrain, DXF/SVG insert, 3D sketch curves (Project To Surface, Intersection Curve, Isoparametric Curve, Spun Profile), exact free-form profiles (B-spline/NURBS edges, any spline degree, curves cut by crossings), sweeps and pipes along 3D sketch curves, canvases and decals, curvature combs. Exact free-form Extend and certified associative offsets now preserve geometry and IDs through edits, deletion and reopen. Occurrence-frame 3D wires now store explicit coordinate spaces and retain points and analytic fits through moves, refresh, undo and reopen. Constructive sketch solving (Owen 1991, Fudos & Hoffmann 1997) ahead of the numerical solver: points and rigid clusters are placed on the branch the sketch had, so dimension edits and drags keep their solution; edits that would turn a sketch over are refused; drags re-solve only the sketch per frame. Remaining workflow repairs: mixed offset junctions, legacy natural-spline seams, and damaged legacy wire links lacking frame provenance | in progress | 4 |
+| M1 | Sketch depth: command coverage implemented — projection/intersect/include as linked geometry (auto-project on faces, lost-reference warnings, break link), full SKETCH create/modify set (slots, polygons, tangent arcs/circles, ellipse, fit/control splines, conic, text, trim/extend/break, fillet/chamfer, offset, mirror, patterns, move/scale, blend curve, centerline), constraints incl. curvature and polygon with over-constraint refusal, Shift-picked line midpoints in Horizontal/Vertical using persisted points and ordinary constraints (#2087), driven/arc-length/linear-diameter dimensions, AutoConstrain, DXF/SVG insert, 3D sketch curves (Project To Surface, Intersection Curve, Isoparametric Curve, Spun Profile), exact free-form profiles (B-spline/NURBS edges, any spline degree, curves cut by crossings), sweeps and pipes along 3D sketch curves, canvases and decals, curvature combs. Exact free-form Extend and certified associative offsets now preserve geometry and IDs through edits, deletion and reopen. Occurrence-frame 3D wires now store explicit coordinate spaces and retain points and analytic fits through moves, refresh, undo and reopen. Constructive sketch solving (Owen 1991, Fudos & Hoffmann 1997) ahead of the numerical solver: points and rigid clusters are placed on the branch the sketch had, so dimension edits and drags keep their solution; edits that would turn a sketch over are refused; drags re-solve only the sketch per frame. Remaining workflow repairs: mixed offset junctions, legacy natural-spline seams, and damaged legacy wire links lacking frame provenance | in progress | 4 |
 | M2 | Robust modelling: coplanar booleans in the kernel, holes (placed on faces and on sketch points), threads (cosmetic, then modelled), patterns, mirror, shell, draft, split, construction geometry | in progress | 16 |
-| M3 | General fillets and chamfers (curved edges, chains, vertex blends); saddle rolling-ball surfaces now use continuous seam sections and arc-length fitting with shared contact boundaries and bounded accuracy checks | in progress | 30 |
-| M4 | Files: STEP import (done — [docs/step-import.md](docs/step-import.md)), 3MF export and 3MF/STL import as mesh bodies (done), constant-section parametric mesh reconstruction, DXF sketches, OBJ import | in progress | 6 |
+| M3 | General fillets and chamfers (curved edges, chains, vertex blends); saddle rolling-ball surfaces now use continuous seam sections and arc-length fitting with shared contact boundaries and bounded accuracy checks; tiny rim edges remain selected instead of nearby wall seams when filleting (#2498) | in progress | 30 |
+| M4 | Files: STEP import (done — [docs/step-import.md](docs/step-import.md)), FreeCAD/Rhino solids through cadmpeg (done, desktop and CLI), 3MF export and 3MF/STL import as mesh bodies (done), 3MF with B-rep face tags ([docs/formats/3mf-face-tags.md](docs/formats/3mf-face-tags.md), done), constant-section parametric mesh reconstruction, DXF sketches, OBJ import | in progress | 6 |
 | M5 | Persistent naming of faces and edges (docs/book/src/dev/naming.md): faces named from their exact kernel-reported history (sketch curve sides, caps, revolve sections, primitive sides, blends, shell inner walls, pattern/mirror copies; split pieces told apart by the faces around them, lumps of a cut body named after their faces), edges by their faces; fillets/chamfers, sketches on faces, shell/draft/offset/replace faces, hole placements, joint origins and face appearances resolve by name first and warn when the entity split or vanished: done. sheet metal edges by base sketch line and flange side, shell inner faces, sweep and loft roles: done. kernel-reported face history: done (merged faces answer to every name; operations without history yet fall back to geometric names, flagged unverified; format 14 keeps older designs' geometric names). Left: history through sheet metal, plastic, surface and emboss features; FaceSource certificates through history | in progress | 20 |
-| M6 | UI depth: selection feedback and origin (done), timeline editing (done: hover and selection highlight modifier faces, including fillets and chamfers; edit feature, history marker drag, reorder with dependency checks, suppress, rename, delete with dependents, re-resolved references; redefining selections refreshes persistent edge/face references while retaining feature identity and dimension names), right-docked dialogs (done), live previews for every feature dialog (done), keyboard-first commands with on-canvas value boxes and sketch inline dimensions (done), drag manipulators with automatic join/cut (done: extrude incl. two sides, fillet, shell, hole depth, move, pattern spacing, revolve rotator; taper handle open), dark theme (done), right-click menu with Repeat (done), measure tool (done), section analysis (done), selection filter (done), drag-solve of sketch points (done); appearance controls now preserve body/face/component targeting, named transparent looks, reuse/search and override removal; preferences | in progress | 6 |
-| M7 | Sweep, loft (incl. to a point), rib and web (to next / depth), emboss (planar faces and exact radial emboss/deboss of bounded orthogonal profiles on complete exterior cylinders/sleeves), thread (cosmetic, and modelled M3–M20 outside and inside: the ISO profile screwed in as a faceted cut), coil (smooth B-spline helical walls), pipe, pattern on path, patterns of bodies and components, replace face (parallel), align, remove, feature copy/paste: done. Unique eligible cylindrical targets are inferred for new Emboss features. Left: general curved-face emboss and exact (unfaceted) modelled threads | in progress | 12 |
-| M8 | Surface workspace | deferred | — |
-| M9 | Components and assemblies: New Component / Create Components from Bodies, active component, per-component origin/bodies/sketches/timeline entries, occurrences with transforms, Copy/Paste vs Paste New, nested Browser tree with visibility and isolate; Ground, Move/Copy of occurrences, joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) by joint origins with limits and Drive Joints, As-built Joint, Rigid Group, Contact Sets (driving and motion studies stop where bodies in a set would pass through each other), Motion Study (joint values keyed along a timeline, playback, export of occurrence positions as JSON/CSV), Exploded views (automatic or by hand, shown without changing placements); interference, per-component physical properties; STEP with assembly structure. Physical properties now measure material-aware component/occurrence placements, descendants and repeated instances, including pending moves and body reassignment offsets; contact geometry and automatic exploded centres respect those offsets. Groundwork done: component tree, occurrences with transforms (instances, Paste New), world placement, active component as authoring frame, ground, Capture/Revert Position, moving bodies and sketches. UI: ASSEMBLE panel dialogs for New Component, Joint (snaps on faces, edges, circles and vertices; animated motion preview; offsets, flip, limits), As-built Joint, Joint Origin, Rigid Group, Drive Joints (live slider), Motion Link and Interference (overlaps shown red); joints in the timeline and the Browser | in progress | 32 |
-| M10 | Sheet metal: flange (base, edge, contour), hem, unfold/refold, convert, flat pattern + DXF, rules: done. PLASTIC enclosure subset: Boss, Rib, Web, Lip/Groove, Snap Fit, Rest, Plastic Rules (library, edit, assign; rule draft and clearance as feature defaults): done, tested against hand-computed geometry. UI: SHEET METAL and PLASTIC tabs in Fusion's layout with dialogs (live preview, Edit Feature, pre-selection) for Flange, Hem, Unfold/Refold, Convert, Sheet Metal Rules, Create Flat Pattern (flat view with bend lines, bend table CSV/JSON and DXF export with exact circle/arc/line cutouts), Boss, Lip/Groove, Snap Fit, Rest, Manage and Assign Plastic Rules; Fold (bend along a sketch line); flanges meeting at a corner closed at any angle with the rule's gap | in progress | 36 |
+| M6 | UI depth: selection feedback and origin (done), timeline editing (done: hover and selection highlight modifier faces, including fillets and chamfers; edit feature, history marker drag, dependency-checked single and multi-item reorder, suppress, rename, delete with dependents, re-resolved references; redefining selections refreshes persistent edge/face references while retaining feature identity and dimension names; optional compact named left feature history with rollback bar, multi-selection and persistent folders above the parts browser), right-docked dialogs (done), live previews for every feature dialog (done), keyboard-first commands with on-canvas value boxes and sketch inline dimensions (done), drag manipulators with automatic join/cut (done: extrude incl. two sides, fillet, shell, hole depth, move, pattern spacing, revolve rotator, extrude taper), dark theme (done), right-click menu with Repeat (done), measure tool (done), section analysis (done), selection filter (done), drag-solve of sketch points (done); appearance controls now preserve body/face/component targeting, named transparent looks, reuse/search and override removal; preferences | in progress | 6 |
+| M7 | Thin extrude (walls along open or closed curves: centre, inside, outside or two sides; mitred corners, crossing walls joined; #721), sweep, loft (incl. to a point), rib and web (to next / depth), emboss (planar faces and exact radial emboss/deboss of bounded orthogonal profiles on complete exterior cylinders/sleeves), thread (cosmetic, and modelled M3–M20 outside and inside: the ISO profile screwed in as a faceted cut), coil (smooth B-spline helical walls), pipe, pattern on path, patterns of bodies and components, replace face (parallel), align, remove, feature copy/paste: done. Unique eligible cylindrical targets are inferred for new Emboss features. Left: general curved-face emboss and exact (unfaceted) modelled threads | in progress | 12 |
+| M8 | Surface workspace (#772). Done: Patch (sketch regions; edge loops filled G0, plus `crown`), Stitch, Thicken (planes and cylinders), Extend (straight edges of planar surfaces), Trim (by a plane, a face or sketch curves swept onto the surface, keeping a side or the picked regions; mutual trim of two surfaces, extended to meet and stitched, #767), Delete Face (healing), Boundary Fill, zebra/draft/curvature-map analysis, Surface Extrude/Revolve/Sweep/Loft from open and closed curves, Offset, Unstitch and Reverse Normal; the continuity-driven core (`kernel/src/bridge.rs`, G0–G3 Hermite rows) with **Blend** (`surface.blend`, #764: edge chains along one or several faces, closed rims paired seam to seam or from picked seams, a dialog), **Match** (`surface.match`), **Boundary** (`surface.boundary`, #763 — two sketch curves exact with G0–G3, three or four as the flat patch of their loop, and curve networks: Coons and Gordon surfaces through sketch, 3D-sketch or edge curves, a point for a three-sided side, G1/G2 against the faces along one direction's edges, joined into their body on request; G1/G2 on two sides that meet at a corner waits for the Gregory-type corner), **Fair** (`surface.fair`, CV fairing), **continuity analysis** (`inspect.continuity`, #770; a toolbar tool with edge markers and a legend, and curvature combs along face isocurves) and a multi-section **loft** with per-end continuity and crown, and guide rails on solid and surface lofts (one or two, scaling or stretching the sections between; #201). Also in the Class-A pass: G1…G4 blend curves in the sketch, chord and variable-radius fillets on curved edges (with honest refusals where the fit cannot hold), and a G2 corner patch where filleted edges meet (kernel; the command refuses until the patch's sections can be sewn to the blends' contacts). Left: bias/form-factor fillet sections (design recorded), a Gregory-type corner, surface Fillet between separate surface bodies (#769), Ruled (#762), Untrim (#761), curved-face Extend (#760), and every remaining #757–#772 item | deferred | — |
+| M9 | Components and assemblies: New Component / Create Components from Bodies, active component, per-component origin/bodies/sketches/timeline entries, occurrences with transforms, Copy/Paste vs Paste New, nested Browser tree with visibility and isolate; Ground, Move/Copy of occurrences, joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) by joint origins with limits and Drive Joints, closed kinematic loops (four-bar, slider-crank: the loop's other joints follow the driven one on its branch, and driving stops where a loop can no longer close), cams (`joint.cam`: a revolute cam drives a slider or revolute follower along a closed sketch profile or the cam's edges, knife, roller or flat followers, worked out again when the profile changes; drives, studies, closed loops, contact sets), As-built Joint, Rigid Group, Contact Sets (driving and motion studies stop where bodies in a set would pass through each other), Motion Study (joint values keyed along a timeline, playback, export of occurrence positions as JSON/CSV), motion analysis (joint values and a point's path charted over a study as value, velocity and acceleration; the parts that collide along a study, with the steps where they do), Exploded views (automatic or by hand, shown without changing placements); interference, per-component physical properties; STEP with assembly structure; URDF export for robot simulators (links with meshes, mass and inertia; joint chains whose values match Drive Joints; docs/urdf.md). Physical properties now measure material-aware component/occurrence placements, descendants and repeated instances, including pending moves and body reassignment offsets; contact geometry and automatic exploded centres respect those offsets. Groundwork done: component tree, occurrences with transforms (instances, Paste New), world placement, active component as authoring frame, ground, Capture/Revert Position, moving bodies and sketches. UI: ASSEMBLE panel dialogs for New Component, Joint (snaps on faces, edges, circles and vertices; animated motion preview; offsets, flip, limits), As-built Joint, Joint Origin, Rigid Group, Drive Joints (live slider), Motion Link, Cam and Interference (overlaps shown red); joints in the timeline and the Browser | in progress | 32 |
+| M10 | Sheet metal: flange (base, edge, contour), hem, unfold/refold, convert, flat pattern + DXF, rules: done. PLASTIC enclosure subset: Boss, Rib, Web, Lip/Groove, Snap Fit, Rest, Plastic Rules (library, edit, assign; rule draft and clearance as feature defaults): done, tested against hand-computed geometry. UI: SHEET METAL and PLASTIC tabs with dialogs (live preview, Edit Feature, pre-selection) for Flange, Hem, Unfold/Refold, Convert, Sheet Metal Rules, Create Flat Pattern (flat view with bend lines, bend table CSV/JSON and DXF export with exact circle/arc/line cutouts), Boss, Lip/Groove, Snap Fit, Rest, Manage and Assign Plastic Rules; Fold (bend along a sketch line); flanges meeting at a corner closed at any angle with the rule's gap; edge flanges with their own angle and height per edge in one feature; corner reliefs (notch, round, rectangular, tear) chosen by the rule; Convert to Sheet Metal from a solid or shelled body by its bend edges (flat faces, sharp bends) | in progress | 36 |
 | M11 | 2D drawings | deferred | — |
 | M12 | Release: cross-platform packages, verification and deliberate publication implemented; original current-UI demo refreshed. Trusted distribution signing and broader performance work remain | in progress | 16 |
 | M14 | Configurations: a table of rows (parameter expressions and feature suppressions per row) switched with config.activate (undoable, all or nothing), kept through parameter renames and feature deletes (config.configure, config.table, config.column/row/activate). Per-row body materials and appearances (library looks, custom colour/opacity and clearing overrides), undoable activation and save/reopen: done. Ordered typed configuration rules, atomic validation and structured rule editing: done. Component appearance and certified semantic face style columns, atomic preview/apply and independent-copy remapping: done. Exact constructed sketch-side and immutable imported-face lineage now preserve legacy names and reject retargeting. Left: ambiguous shifted/two-sided caps | in progress | 4 |
 | M13 | Never lose work: atomic saves (temporary file, flush, rename; a crash at any moment leaves the old file or the new one) with the replaced version kept as `<file>.bak`; autosave of unsaved changes to the recovery folder every 5 minutes (preference) and after big operations, only when something changed; "Recover unsaved design?" on the next launch (`doc.recovery_list`, `doc.recover`, `doc.recovery_discard`); a kill-mid-save test (process killed while saving a 0.5 MB design 25 times). File format: `"format": "solidcraft/12"`, older formats upgraded step by step (`doc::format`), newer ones refused with a message, out-of-range numbers and broken placements refused; a corpus of designs saved by M0, components-era, joints-era and current builds (apps/solidcraft-cli/tests/corpus) that must open and evaluate as saved; damaged and hostile variants (truncation, bit flips, hostile values, removed keys, repeated features, deep nesting) never panic | done | 6 |
 
+M6 navigation preferences include **Touchpad**: Shift + pointer movement pans, Alt/Option +
+pointer movement orbits without a mouse button, and vertical scrolling zooms. Other presets
+retain their saved two-finger scroll preference; camera motion is available through
+`view.navigate` and modifier-aware `ui.move` automation.
+
+M11 precursor: File → Export Current View as DXF exports shown placed bodies from the current
+camera as a 2D millimetre drawing, with hidden edges omitted or dashed. Vector occlusion splits
+partly hidden edges and includes curved silhouettes. Repeated part meshes and triangle
+hierarchies are shared; bounded desktop preparation and occlusion use up to eight workers.
+Curves are approximated; drawing sheets,
+annotations and exact projected curves remain deferred. See [view DXF](docs/view-dxf.md).
+
+Drawing foundations: [RFC #860](https://github.com/tangency-labs/solidcraft/issues/860)
+and the [foundation ledger](docs/drawing-foundations.md) track the bounded implementation
+packages. The first geometry increment defines validated section records in a plane-local
+frame; the ledger separates that contract from section producers and the Drawing workspace.
+
+Desktop view DXF export runs in the file-operation worker with five-stage progress and
+cooperative cancellation. Curve tolerance (0.0001–1 mm, default 0.01 mm) is remembered alongside
+the hidden-edge setting. Cancelled exports preserve the model and the previous destination;
+completed drawings publish atomically. The browser still exports synchronously.
+
+## Interactive modelling
+
+- Modelled threads preview their cut before OK using the background worker on desktop.
+  Browser users apply the cut with OK to avoid blocking on every edit.
+
+- Thread resolves a suggested metric size when a cylindrical face is picked. Diameter and
+  pitch selectors expose the existing metric designation parameter; custom designations stay
+  editable, and Automatic size returns to the face's suggestion. Cosmetic/modelled and
+  full/partial-length options remain available. This does not add tolerance classes or
+  left-hand threads.
+- New Body extrusion and face-offset previews show completed intermediate geometry while a
+  drag continues, then catch up to the exact final value. Changes to the selected geometry,
+  operation or feature still discard obsolete results. Distance arrows and their value boxes
+  follow the current frame's input.
+- Large fine modelled threads use pitch-based helix resolution and tighter faceted
+  reconstruction fallbacks, preserving thin crests and closed shells on large shafts.
+
+## Physical material data
+
+- Physical material card validation (#923/#922) provides typed SI mechanical and
+  thermal data, per-property sources/conditions and isotropic/orthotropic stability
+  checks through read-only `material.properties.validate`. It does not assign or
+  persist properties, provide a solver or enable rendering; see
+  [the contract and staged follow-ups](docs/physical-material-cards.md).
+
+- Directional elasticity (#994) queries the validated card in material-local axes
+  through read-only `material.properties.directional`, with source/condition review.
+  It does not assign body frames, predict structural behavior or enable a solver.
+
+## Library foundations (#785, #786, #787)
+
+- Local scalar libraries (#846) inspect/export bounded portable catalogs and copy exact
+  selected appearance/material revisions into existing design definitions in one undo step.
+  Appearance offers local loading/search/export; physical materials use existing commands.
+  This slice is independent of the render stack and does not change the document format.
+  See [the contract and limits](docs/book/src/dev/local-libraries.md).
+
+- Proposed phases cover offline bundled/project/user packs, physical materials and
+  appearances, editable wood mapping, and parameterized component/assembly families.
+  Stable identity/revision, copied design definitions, provenance and resource limits
+  apply from the first implementation. Existing material, appearance and standard-part
+  commands remain the application paths. See [the proposal](docs/book/src/dev/libraries.md)
+  for source/license review and acceptance gates. This is planning only: pack loading,
+  texture rendering and expanded component families are not implemented by this entry.
+
+## Render foundation
+
+- Explicit texture normalization (#1218) produces completed float RGBA with
+  role-aware linear color/data semantics, bounded matrix/TRC ICC conversion and
+  opt-in EXIF orientation. It retains high-precision raw samples and records lossy
+  gamut clipping only when explicitly requested. It is not a renderer/resource
+  consumer; see [the supported policy and limits](docs/render-texture-normalization.md).
+
+- Opt-in opaque PBR (#1046) connects persisted surface parameters to the integrated
+  product viewport and CPU PNG, using a fixed direct-light studio. Geometry and mass
+  stay unchanged. HDRI, transmission and textures remain separate gates.
+  See [the consumer and limitations](docs/render-opaque-pbr.md).
+
+- Combined integration is tracked in #842, with independent scalar libraries in
+  #863 and richer PBR/material-card transport in #1086. See [phase boundaries and validation gates](docs/render-integration.md).
+  Render/library consumers use the merged asynchronous picker (#1127). Material-card
+  UI (#1094), texture mapping and HDRI lighting remain explicit follow-ups.
+
+- R4a adds bounded CPU product-image jobs, cancellation and atomic PNG export through
+  engine commands, the Render panel, CLI and persistent MCP. Immutable captures and
+  results stay outside persistence/undo; native workers and cooperative browser tasks
+  share the same work protocol. See [jobs, limits and export](docs/render-jobs.md).
+
+- R3 adds an overlay-free product scene and the integrated Render workspace, with
+  runtime GPU host capabilities, per-document drafts and named camera/background
+  controls. Design keeps its camera and drawing policy. Raster transparency remains
+  approximate; PBR and environments are later slices. See
+  [workspace and scene contracts](docs/render-workspace.md).
+
+- R2 adds bounded named render setups in document format 21 and the read/save
+  `render.settings.get/set` commands. Proven render-only changes preserve geometry
+  and prepared world data through undo/redo and checkpoint restore. This slice does
+  not add a Render workspace, PBR, environments or image jobs; see
+  [settings and refresh policy](docs/render-settings.md).
+- Bounded PNG/JPEG texture admission (#900) validates in-memory sources and returns
+  completed RGBA8 pixels with explicit color/data roles. It is an input utility only:
+  ICC/16-bit normalization, local wood mapping, resource persistence and the renderer
+  consumer remain separate work. See [limits and licensed-file probes](docs/render-texture-input.md).
+
+- The initial opaque surface numerical contract for #1004 provides bounded linear
+  color/metallic/roughness/IOR admission and an original tested direct-light BRDF.
+  The numerical module alone advertises no capabilities; the installed consumer above
+  provides rendering. See
+  [the model, evidence and remaining consumer gates](docs/render-surface.md).
+
+- A bounded cooperative Radiance RGBE input utility is available in L1 render;
+  it does not yet enable HDRI/PBR rendering or a document import command. See
+  [the input contract](docs/render-hdr-input.md) and #813 for integration work.
+- R1 adds renderer-independent backend/profile metadata, strict request resolution and
+  bounded image/scratch admission checks, exposed by the read-only `render.backends`
+  command. It describes the current CPU raster snapshot path without evaluating the model.
+  The legacy Design snapshot route remains unchanged. Later slices above provide the
+  workspace/jobs and opaque PBR; HDRI and optional engines remain future work. See [the contract](docs/render-backends.md)
+  and [the phased proposal (#620)](https://github.com/bherbruck/solidcraft/issues/620).
+
 ## Dimensioning and error reporting
 
+- MCP `execute` accepts `verbose: false`, sharing the compact reply helper used by
+  `batch`: body changes and created sketch IDs stay, while repeated lists are omitted.
+  Both tools retain full replies by default.
+
+- Sketch Create groups drawing variants under Line, Rectangle, Circle, Arc, Slot,
+  Polygon and Spline. Each open part remembers its last interactive choice per family
+  across sketch sessions and document-tab switches; closing the part resets these UI choices.
+- Inscribed, circumscribed and edge polygon tools preview their actual outline before
+  placement, including orientation and the selected side count.
+- Construction (X) preserves the active sketch drawing tool, picked anchors and inline
+  dimension values, so line type can change while a shape is in progress.
+- Planar sketch construction previews and hover feedback keep the same dashed pattern as
+  committed geometry; centerlines retain their dash-dot pattern.
+
+- Point has a default Sketch CREATE toolbar button alongside the existing drawing tools.
+  Saved custom layouts are preserved; Reset Toolbar restores the default Point button.
 - Construction planes cannot take an origin-plane name (XY, XZ, YZ, Top, Front, Right). Plane
   arguments reject such a name when an older design's construction plane already has it. Use
   the other alias, the construction feature's numeric ID or an explicit plane; existing
   stored references keep their saved meaning. Section Analysis uses the same check.
-- Sketch text can be edited from a selected outline's context menu or the Edit Text command.
+- Sketch text can be edited from a letter interior or outline's context menu or the Edit Text command.
+  Interior selection requires every profile boundary to belong to the same text source;
+  the editor highlights the whole source without replacing profile selections.
   Content, baseline X/Y, height and rotation update the original text source in one undo step;
   cancelling or rejecting an invalid value preserves the sketch. Position and height fields
   use the document units captured when editing starts; generated outlines remain associated
   with their text source, and untouched inputs preserve their saved internal values.
+  Dragging a text outline moves the entire source in one undo step; Escape restores the
+  gesture. Move/Copy on a selected text outline provides unit-aware X/Y distances and rotation
+  about its baseline; copies keep an independent editable text source.
 - Repeating the initial point of a planar multi-point sketch drawing tool is neutral: the tool
   waits for a distinct point without a degenerate-shape error or history entry. Typed input
   and programmatic commands retain their validation.
@@ -80,6 +229,9 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   Type a value and press Enter to commit one undo step; rejected values remain editable and
   cancellation leaves the sketch unchanged. Fit keeps geometry clear of the Sketch Palette
   and navigation controls, including enlarged displays and nested pending placements.
+- Sketch Dimension takes a line and a circle or arc (#1803): it measures from the line to the
+  circle's edge (the gap, 0 when tangent, or how far the edge reaches past a line that cuts
+  it), drives it like any other dimension and keeps the circle on its side of the line.
 - Sketch annotations, live drawing lengths and Measure use document units. Inches show
   three decimals and retain a meaningful fourth digit. Bare length dimension entry captures
   the current design unit; changing units leaves existing geometry and expressions intact.
@@ -104,6 +256,21 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   Crash Reports…) with a reviewed issue draft; agents read them through
   `diagnostics.crash_reports`, the MCP `crash_reports` tool or the CLI. Nothing is sent
   anywhere. See [crash reports](docs/crash-reports.md).
+- Agent chat (off by default, desktop): a side panel that drives a coding agent the user
+  already has (Claude Code through its ACP adapter, Codex, Gemini CLI, OpenCode, Grok Build, …) over the
+  Agent Client Protocol, under the user's own login; SolidCraft stores no keys. The agent works
+  through SolidCraft's MCP tools on a gated endpoint of its own: file actions wait for Allow or
+  Deny, crash reports are off limits, 24 changes per message, one undo step per message, and
+  the agent's whole process group ends with the panel or the app. Docks left or right,
+  minimises to a strip. Grok Build discovery includes `~/.grok/bin` and reuses the user's
+  Grok login. See [agent chat](docs/agent-chat.md).
+- Command scripts from designs (#886): `timeline.export_script` (CLI `solidcraft-cli script`)
+  writes a design's history as a script that `eval` and `run` replay into the same design —
+  user parameters, units, sheet metal and plastic rules and materials as their own commands,
+  then each feature through `timeline.add` with its ids, names and dimension parameters kept,
+  so every feature kind replays exactly and a failing feature fails the same way. Trimming the
+  script after a step gives the design at that step. Appearances, folders, views and
+  configurations are listed as left out; components and joints are not supported yet.
 
 ## 0.2.0 release batch
 
@@ -124,6 +291,25 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## 0.2.1 critical fixes
 
+- Separated multi-profile Join/Cut extrusions into one solid target batch their tools using
+  conservative construction bounds, avoiding a Boolean rebuild for every profile. Live
+  extrusion previews build only their tools; confirmation validates the final Boolean.
+- Coplanar selected body faces share one linked sketch and one extrusion. Automatic Join/Cut
+  keeps the evaluator's participant scope, including parts of an empty imported component. Desktop OK/Enter
+  computes on a scratch session in the background, with atomic acceptance and cancellation.
+  Planar section stitching projects lines/arcs analytically and removes duplicate endpoints.
+- Imported rotated face groups can check all full start-face seams in one guarded
+  construction. Separated tools may batch a Join when each meets the same single body;
+  nearby uninvolved bodies retain the original contact decisions. Regression comparisons
+  cover all four extrusion operations.
+- Inward multi-face cuts retain every eligible target and subtract separated tools together.
+  Safe interior classification handles roundoff at shared imported line/arc endpoints.
+  Straight extrusion feedback caches existing face/profile triangles and updates the display
+  directly, including a newly opened STEP's single identity component placement; other
+  extents, moved or repeated components and curved sketch profiles keep the Engine preview.
+- The extrusion fixes retain tracked Boolean history and the current `solidcraft` packages.
+  Confirmation and tool previews use main's shared background calculation. Main's collapsed
+  blend-wall refusal and its tests are retained, including smaller valid radii and mirrored parts.
 - Axis view and navigation controls stay anchored to the viewport when feature dialogs or
   the command palette open, at normal and enlarged display scales. Fit still accounts for
   dialog coverage; covered controls do not receive clicks through dialogs.
@@ -145,6 +331,9 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## View navigation
 
+- Desktop Ctrl/Cmd +/- and 0 change or reset the saved UI scale. The scale slider keeps
+  its layout stable during a drag and applies the selected scale on release.
+
 - OpenSCAD navigation preset: left drag orbits, right/middle drag pans, Shift+right/middle
   drag zooms, and the wheel zooms. Available in the shared desktop/web Navigation preferences.
 - Compact clickable signed X/Y/Z axis tips, smooth drag-to-orbit, and Shift-orbit snapping
@@ -154,18 +343,35 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
 
 ## Known limitations
 
+- Scheduled and manual CI scan locked dependency advisories, bans and sources with
+  cargo-deny. Vulnerabilities fail the scan; unmaintained crates warn. Local vendored
+  patches require separate upstream review because advisory databases cannot version-match
+  their path dependencies. Pull requests retain the existing licence checks.
+
 - Associative shell-face sketches require a unique certified planar source. Nested shell
   attachments and ambiguous coincident sources remain unsupported.
+- G2 fillets: exact quintic blends of straight edges between planar faces, with one planar
+  end face at each end, including sloped ends (#2708). The UI and `solid.fillet` expose
+  `curvature` (alias `g2`); the size is an equivalent circular setback. Curved faces/edges,
+  multi-face ends and corner junctions remain unsupported.
 - Fillets and chamfers: constant, variable-radius and chord-length fillets; a radius per edge,
   rounds next to earlier rounds of another radius, and smooth corner patches where three rounds
-  meet (a sphere for equal radii); straight edges (convex or concave) between planar faces with perpendicular
+  meet (a sphere for equal radii); perpendicular corner fillets after a closed ring of earlier
+  rounds preserve the ring's radii and the enclosed planar face (#1557);
+  mitres between separate rounds of the same radius keep their endpoint tangent, so a later
+  fillet can select an upright and its adjoining bottom mitre as one chain (#2422);
+  straight edges (convex or concave) between planar faces with perpendicular
   planar end faces (equal-distance chamfers also meet sloped planar end faces, including inner
   basin rims within the rim width); convex fillets also meet sloped planar ends and reflex
   corners around pocket rims, with unequal wall slopes and extensions confined to the face;
   connected equal-distance chamfers also trim each other across unequal sloped rim walls;
+  curved chamfer chains with straight planar ends can terminate across two existing planar
+  bevel faces, splitting their shared seam; picks on the same tangent chain are applied once (#1303);
   whole smooth loops of a planar face, picked whole or by one edge (tangent
   chain), including circles and walls at any angle (boss bases and tops, bores, pocket floors,
-  plate outlines), loops with sharp corners between straight edges (the blends meet in mitres), runs of
+  plate outlines), loops with sharp corners between straight or mixed arc/line edges (straight
+  blends meet in mitres; perpendicular curved walls use offset intersections, with D-rim removal
+  checked within 0.1% of analytic offset slices), runs of
   neighbouring edges along a planar face's loop (two top edges of a box: mitred, ending square;
   with the edge between them too, the corner becomes a sphere octant),
   rounded corners rounded again (sphere octants, tori at concave corners); every edge of a
@@ -173,7 +379,15 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   edges between any two smooth sides (a branch pipe on a main pipe), by a rolling ball (the
   blend a rational B-spline through exact arcs), closed or ending at planar faces square to the
   edges, where straight or curved cap edges are trimmed to the contacts (the straight edge
-  between two overlapping extruded arcs).
+  between two overlapping extruded arcs); knife edges, where the two faces have opposite
+  normals (a wall that runs out tangent into a face: the ball that fits there); an edge that
+  runs out along an end face tangent to one side (the arc top edge of that wall), cut where the
+  blend meets it; rounds that end in an earlier round on curved faces, in any order (the rounds
+  of two edges at a vertex meet in a crease, as on a box), picked together or one after the
+  other, except a round after a round of the edge between the wall and a flat face that it
+  would run over; the three edges at a vertex of any smooth faces, of one radius, end in a
+  piece of sphere. A limiting blend that collapses a side wall into coincident boundary
+  curves is refused as too large rather than returning an unmeshable face (#1113).
 - Booleans: prisms along one direction (plates with holes, slots, patterns of them, equal
   sections stacked end to end) are combined exactly in 2D. Qualified axial cuts preserve
   annular holes with overrun cutters, including inward Press Pull after a joined extrusion;
@@ -207,10 +421,20 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   and conics; analytic trim/break also sees free-form cutters. Free-form curves cut at a tangent
   touch (no clean crossing) enter that profile as polylines.
   Sweeps along 3D sketch curves follow their polyline (smooth walls when the path is smooth).
+  A sweep with a twist, an end scale or a parallel or direction orientation (#771) follows its
+  path that way too, even along sketch lines and arcs: B-spline walls through stations, ruled
+  walls through denser stations where the path has corners or the profile has holes.
+  Guide rails (one or two, #771) do the same: each station meets every rail once, and the rail
+  turns the profile and scales it (or stretches it across to the rail) against the start; two
+  rails carry it between them. Rails along a path with sharp corners are refused for now.
 - Extend intersects exact ellipses and rational/high-degree splines without moving the line or
   circular support. Associative free-form offsets have a whole-span 0.002 mm normal-distance
-  certificate and refine within bounded node limits while retaining existing IDs. Singular,
-  self-intersecting and ambiguous curves refuse atomically; mixed junctions and nonsmooth
+  certificate and refine within bounded node limits while retaining existing IDs.
+  At the node limit, geometric certificate subdivisions accommodate unequal spline parameter
+  speeds without changing stored nodes or relaxing the distance tolerance (#971).
+  Associated offset fit nodes stay hidden from display, picking and snapping; dragging the
+  editable source updates the derived boundary live. Break Association restores point editing.
+  Singular, self-intersecting and ambiguous curves refuse atomically; mixed junctions and nonsmooth
   closed natural-spline seams remain limitations. New explicitly closed fit splines and closed
   offset outputs use periodic C2 interpolation, supporting repeated certified offsets; older
   natural splines are preserved. Clicking the starting fit point deliberately closes a new loop.
@@ -244,10 +468,13 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   and author occurrence paths retain the chosen placements; missing/split faces refuse rather
   than retarget. General free-form profiles, seams, stepped cylinders and other curved surfaces
   remain unsupported. STEP round-trip and independent radial/volume checks cover this subset.
-- Shell and offset faces work on bodies of planes, cylinders, cones and spheres (convex or not:
+- Shell and offset faces work on bodies of planes, cylinders, cones, spheres and tori (convex or not:
   filleted boxes, bosses, domes, countersinks; corners where four or more planes meet, such as a
   floor falling to a drain, as long as the corner's edges are all convex or all concave); draft on convex planar bodies and on walls (planes, cylinders → cones) between caps; lofts through three or more sections are smooth (B-spline sides through every section), two
-  sections ruled.
+  sections ruled. Circular-meridian barrels retain curved inner walls through either axial
+  opening (#2421). Solid lofts preserve holes through sections with matching hole counts
+  (#2435), including inner walls and caps with openings; a hole cannot appear or disappear
+  between sections, and sections with holes cannot collapse to a point.
 
 - Sketch corner tools: fillet and all three chamfer modes pick a connected corner even when
   its endpoint overlaps the fixed origin or a loose point. Ordinary drawing still snaps to
@@ -285,6 +512,8 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   record their coordinate frame; legacy wires migrate from known provenance without changing
   coordinates. Broken legacy links with missing provenance can require explicit refresh or relink.
   See [occurrence workflows](docs/occurrence-workflows.md).
+- Toolbar drops on panel labels, gaps and margins append commands with insertion feedback;
+  button drops keep insert-before ordering.
 - Parameters and Configurations have distinct actions in the SOLID toolbar's CONFIGURE panel.
   Parameters opens the user/model variable editor; Configurations opens the configuration table.
   Configure remains available in the panel dropdown.
@@ -317,6 +546,12 @@ PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
   exact holes and retained islands, including the union of multiple selected profiles, and
   records complementary depth layers as pockets while retaining the stock gauge. Unsupported
   tapered or bend-crossing machining refuses atomically instead of restoring material later.
+  Sketches attach to a sheet's flat faces (base and flanges, either side) by panel, in the
+  flat pattern's coordinates, and follow it through rebuilds and unfold/refold.
+  A flange on another flange's far edge (a return) follows that flange's closed end and keeps
+  clear of the flange beside it, and the returns of one feature are mitred toward each other
+  with the rule's gap where their flanges meet at a corner; returns of separate features, and
+  flanges on returns, are not closed toward each other.
 - Rolling-ball fillet accuracy: independent offset-cylinder tee references check surface
   distance, actual trimmed tessellation, supporting-cylinder contacts and tangency at two
   scales. The measured trimmed-part error is below 0.0001 mm; this is an analytic geometry
@@ -340,6 +575,15 @@ editing. Construction planes and points resolve drawn 3D wires without applying
 plane a second time. Curved paths use sampled segments; multi-curve chains, absolute distance
 and reference-object placement remain separate work, as do loft rails and centerlines.
 
+## Design properties (#1015)
+
+- Designs carry project, part number, revision, author, organization, description and licence
+  in an optional `metadata` object (File → Design Properties…, `document.metadata.*`,
+  `inspect_design`). STEP and IGES headers and 3MF model metadata take the fields their format
+  has a place for. Other tools keep their own data under a reverse-DNS key, kept as it is
+  through open, edit and save and never exported. See [design properties](docs/book/src/guide/files.md#design-properties).
+  Per-component properties (a part number per component) can follow with the same type.
+
 ## Document-opening performance
 
 - Desktop STEP import prepares consecutive independent solids in bounded batches with up
@@ -350,13 +594,21 @@ and reference-object placement remain separate work, as do loft rails and center
 - Design containers (#303, phase one) separate and deduplicate STEP, raw images and
   lossless binary mesh arrays while keeping plain JSON as a supported Save As/export
   format. Generated-mesh storage measurements reduce serialization and decoding work;
-  evaluated geometry caching and instant cold display remain separate follow-up work.
+  a seekable reader defers original blobs until after provisional display.
   See [container format](docs/design-container.md) and [performance measurements](docs/perf.md).
-- Desktop Open can show an experimental, opt-in bounded saved display preview while rebuilding in the existing
-  file worker. Ordinary saves omit display caches; explicit `preview: true` saves cache
-  only already warm meshes. Document hashes and application versions reject
-  stale previews. Preview geometry cannot be edited or measured, and cancelled or stale
-  completions cannot replace a newer document. Evaluated B-rep restoration remains open.
+- Warm saves with explicit `cache: true` can include a versioned native B-rep cache through SolidCraft-owned topology
+  and geometry records, with a separate truck adapter and bounded binary reader. Exact
+  face-source certificates and operation history survive codec round trips. A provisional
+  picture can be generated before original blobs are read; editing and measurement wait
+  for authoritative reconstruction. Cached metadata binds preview and reconstruction to
+  the same document despite concurrent file writes. Default saves omit this cache and never force cold
+  evaluation or meshing; explicit `preview: true` remains a separate warm-mesh option.
+  Keys, resource budgets and document/revision guards reject incompatible, hostile or
+  stale results. A second modelling kernel still requires its own tested adapter.
+- Warm saves with explicit `cache: true` can also carry a bounded PNG thumbnail from already cached meshes.
+  Home reads it without rebuilding the design when its local picture is missing;
+  mismatched or malformed thumbnails fall back to normal generation. The image is
+  kernel-independent and saving never forces cold meshing to produce it.
 
 - Cold rebuild profiling separates parsing, geometry, placement, display meshing and
   thumbnails. Straight-line closest-point projection and exact curved-surface evaluation
@@ -377,6 +629,14 @@ and reference-object placement remain separate work, as do loft rails and center
   events by strategy and reports any bounded-log truncation. Existing geometry
   acceptance checks remain in force.
 
+- Cylinders of one radius whose axes cross (a second bore across a bore of the same size, a pipe
+  tee of equal pipes) touch at two points, where the mesh intersection cannot trace the curves
+  and a boolean cannot tell the four arms of the crossing apart. When the ordinary boolean fails
+  on such a pair, both faces are split along the line of their cylinder through the touching
+  points (the solids are unchanged), the boolean is taken of those, and its history is composed
+  back over the operands as given (#788). The result keeps the split lines as edges of the bore
+  walls. A crossing the ordinary route fails on and the split faces do not help (a radius of 17.5
+  in a 45 mm block with a tool of 80 mm) is still refused.
 - Boolean intersection-curve construction refuses point-only, collapsed and non-finite
   polylines without panicking. Direct constructor regressions retain valid open endpoints
   and closed spherical intersections; the original interactive trigger remains unidentified.

SECURITY.md

@@ -0,0 +1,32 @@
+# Security policy
+
+## Supported versions
+
+SolidCraft is young and moves quickly, so only the latest release gets security fixes. Please
+update to the [latest release](https://github.com/bherbruck/solidcraft/releases/latest) before
+reporting, and check whether the problem is still on `main`.
+
+| Version | Supported |
+| --- | --- |
+| Latest release | ✅ |
+| Nightly builds | ✅ (fixes land here first) |
+| Older releases | ❌ |
+
+## Reporting a vulnerability
+
+Please **don't open a public issue** for a security problem. Report it privately through GitHub:
+open the repository's [Security tab](https://github.com/bherbruck/solidcraft/security) and choose
+**Report a vulnerability**
+([direct link](https://github.com/bherbruck/solidcraft/security/advisories/new)).
+
+Please include what you found, how to reproduce it (a design file, command or MCP request), the
+version and platform, and the impact you expect. I'll acknowledge the report as soon as I can,
+keep you updated in the advisory, and credit you when the fix is published unless you'd rather
+stay anonymous.
+
+Areas where reports are especially useful:
+
+- opening untrusted design, STEP, STL or 3MF files (crashes, excessive memory or CPU, path tricks)
+- the MCP server and the control API (file access outside the allowed folders, command injection)
+- the web app (anything reaching beyond the page's own storage)
+- release packages and the update paths (AppImage, Flatpak, MSI, deb, rpm, snap)

apps/solidcraft-cli/Cargo.toml

@@ -21,5 +21,10 @@ path = "src/alias.rs"
 
 [dependencies]
 solidcraft-engine = { workspace = true }
+solidcraft-gpu = { workspace = true }
 solidcraft-mcp = { workspace = true }
 serde_json = { workspace = true }
+
+[dev-dependencies]
+# Snapshot tests decode the pictures to compare them with a tolerance.
+image = { workspace = true }

apps/solidcraft-cli/src/bench_agent.rs

@@ -0,0 +1,239 @@
+//! `bench-agent`: a large design built the way an agent builds one over MCP, one small command
+//! at a time, timed as it grows and then opened again.
+//!
+//! The design is a bicycle of about 1,300 bodies: frame tubes joined at root and then moved into
+//! a component, two wheels whose spokes and nipples are placed one by one, a chainring with
+//! patterned teeth, a cassette, a chain of individual links, cockpit, seat and a few hundred
+//! fasteners. Nothing is read from a file; the script is generated here, so the benchmark needs
+//! no fixture.
+//!
+//! ```text
+//! solidcraft-cli bench-agent [--scale F] [--script-out script.json] [--save design.solidcraft]
+//! ```
+//! prints one JSON line per hundred commands (mean and max milliseconds, bodies so far), then the
+//! build total, then the phases `bench-open` prints for the saved design.
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+
+struct Script {
+    commands: Vec<Value>,
+}
+
+impl Script {
+    fn c(&mut self, command: &str, params: Value) {
+        self.commands.push(json!({"command": command, "params": params}));
+    }
+
+    /// A round tube from `a` to `b` (an agent's frame tube, spoke or post).
+    fn tube(&mut self, a: [f64; 3], b: [f64; 3], radius: f64, body: &str) {
+        let d = [b[0] - a[0], b[1] - a[1], b[2] - a[2]];
+        let len = (d[0] * d[0] + d[1] * d[1] + d[2] * d[2]).sqrt();
+        let axis = [d[0] / len, d[1] / len, d[2] / len];
+        self.c(
+            "solid.cylinder",
+            json!({"radius": radius, "height": round3(len), "base": a.map(round3), "axis": axis.map(round6), "body_name": body}),
+        );
+    }
+
+    fn component(&mut self, name: &str) {
+        self.c("component.create", json!({"name": name}));
+    }
+
+    fn root(&mut self) {
+        self.c("component.activate", json!({"component": "root"}));
+    }
+
+    /// A wheel built at the origin in its own component, then placed where it goes (the
+    /// component's occurrence moved), as an agent builds one part and positions it.
+    fn wheel(&mut self, label: &str, at: f64, spokes: usize) {
+        let cx = 0.0;
+        self.component(&format!("{label} wheel"));
+        self.c("solid.torus", json!({"major": 311, "minor": 12, "center": [cx, 0, 340], "body_name": format!("{label} rim")}));
+        self.c("solid.torus", json!({"major": 330, "minor": 18, "center": [cx, 0, 340], "body_name": format!("{label} tyre")}));
+        self.c("solid.cylinder", json!({"radius": 18, "height": 110, "base": [cx, -55, 340], "axis": "Y", "body_name": format!("{label} hub")}));
+        for k in 0..spokes {
+            let a = std::f64::consts::TAU * k as f64 / spokes as f64;
+            let side = if k % 2 == 1 { 1.0 } else { -1.0 };
+            let hub = [cx + 30.0 * a.cos(), side * 40.0, 340.0 + 30.0 * a.sin()];
+            let (ca, sa) = ((a + 0.12).cos(), (a + 0.12).sin());
+            let rim = [cx + 300.0 * ca, side * 4.0, 340.0 + 300.0 * sa];
+            self.tube(hub, rim, 1.0, &format!("{label} spoke {k}"));
+            let nipple = json!({"radius": 2, "height": 12, "base": rim.map(round3), "axis": [round6(ca), 0, round6(sa)], "body_name": format!("{label} nipple {k}")});
+            self.c("solid.cylinder", nipple);
+        }
+        self.root();
+        self.c("occurrence.move", json!({"occurrence": format!("{label} wheel:1"), "translate": [at, 0, 0]}));
+    }
+}
+
+fn round3(v: f64) -> f64 {
+    (v * 1e3).round() / 1e3
+}
+
+fn round6(v: f64) -> f64 {
+    (v * 1e6).round() / 1e6
+}
+
+/// The bicycle's command script. `scale` multiplies the counts of repeated parts (spokes,
+/// chain links, fasteners); 1.0 gives about 1,300 bodies.
+pub fn bicycle(scale: f64) -> Value {
+    let n = |k: f64| ((k * scale).round() as usize).max(1);
+    let mut s = Script { commands: Vec::new() };
+    // Frame: tubes at root, the main triangle joined, then everything moved into its component.
+    let (bb, head_top, head_bot, seat_top) = ([0.0, 0.0, 300.0], [600.0, 0.0, 860.0], [580.0, 0.0, 740.0], [-150.0, 0.0, 820.0]);
+    s.tube(bb, head_bot, 19.0, "Down tube");
+    s.tube(seat_top, head_top, 16.0, "Top tube");
+    s.tube(bb, seat_top, 16.0, "Seat tube");
+    s.tube(head_bot, head_top, 22.0, "Head tube");
+    for (side, y) in [("L", 60.0), ("R", -60.0)] {
+        s.tube([0.0, y * 0.3, 300.0], [-420.0, y, 340.0], 10.0, &format!("Chainstay {side}"));
+        s.tube([-140.0, y * 0.3, 800.0], [-420.0, y, 340.0], 9.0, &format!("Seatstay {side}"));
+        s.c("solid.box", json!({"length": 20, "width": 6, "height": 40, "corner": [-430.0, y - 3.0, 320], "body_name": format!("Dropout {side}")}));
+    }
+    s.c("solid.cylinder", json!({"radius": 24, "height": 80, "base": [0, -40, 300], "axis": "Y", "body_name": "BB shell"}));
+    s.c("solid.combine", json!({"target": "Down tube", "tools": ["Top tube", "Seat tube", "Head tube", "BB shell"]}));
+    s.component("Frame");
+    s.root();
+    let frame = ["Down tube", "Chainstay L", "Seatstay L", "Dropout L", "Chainstay R", "Seatstay R", "Dropout R"];
+    s.c("component.move_bodies", json!({"bodies": frame, "component": "Frame"}));
+    // Wheels: every spoke and nipple a body of its own.
+    s.wheel("Front", 640.0, n(36.0));
+    s.wheel("Rear", -420.0, n(36.0));
+    // Drivetrain: patterned chainring teeth, a cassette and a chain of separate links.
+    s.component("Drivetrain");
+    s.c("solid.cylinder", json!({"radius": 95, "height": 4, "base": [0, 50, 300], "axis": "Y", "body_name": "Chainring"}));
+    s.c("solid.box", json!({"length": 6, "width": 4, "height": 8, "corner": [-3, 50, 395], "name": "Tooth", "body_name": "Tooth"}));
+    s.c("solid.pattern.circular", json!({"bodies": ["Tooth"], "axis": {"origin": [0, 50, 300], "dir": [0, 1, 0]}, "count": 44}));
+    for g in 0..11 {
+        let r = 22.0 + 3.5 * g as f64;
+        s.c(
+            "solid.cylinder",
+            json!({"radius": r, "height": 2, "base": [-420.0, round3(30.0 + 2.6 * g as f64), 340.0], "axis": "Y", "body_name": format!("Cog {g}")}),
+        );
+    }
+    let links = n(112.0);
+    for k in 0..links {
+        let a = std::f64::consts::TAU * k as f64 / links as f64;
+        let (x, z) = (round3(-210.0 + 230.0 * a.cos()), round3(320.0 + 80.0 * a.sin()));
+        for (side, y) in [("in", 46), ("out", 56)] {
+            s.c("solid.box", json!({"length": 12, "width": 1, "height": 8, "corner": [round3(x - 6.0), y, round3(z - 4.0)], "body_name": format!("Link {k} {side}")}));
+        }
+        s.c("solid.cylinder", json!({"radius": 3.5, "height": 10, "base": [x, 46, z], "axis": "Y", "body_name": format!("Roller {k}")}));
+    }
+    for (side, y) in [("L", -90.0), ("R", 90.0)] {
+        let x0 = if side == "L" { -15.0 } else { 0.0 };
+        s.c("solid.box", json!({"length": 170, "width": 12, "height": 30, "corner": [x0, y - 6.0, 285], "body_name": format!("Crank {side}")}));
+        let py = if y > 0.0 { y + 8.0 } else { y - 68.0 };
+        s.c("solid.box", json!({"length": 90, "width": 60, "height": 15, "corner": [150.0, py, 280], "body_name": format!("Pedal {side}")}));
+    }
+    s.root();
+    // Cockpit and seat.
+    s.component("Cockpit");
+    s.tube([600.0, 0.0, 860.0], [620.0, 0.0, 940.0], 14.0, "Steerer");
+    s.tube([620.0, 0.0, 940.0], [700.0, 0.0, 950.0], 16.0, "Stem");
+    s.tube([700.0, -380.0, 950.0], [700.0, 380.0, 950.0], 11.0, "Handlebar");
+    s.c("solid.cylinder", json!({"radius": 16, "height": 120, "base": [700, 260, 950], "axis": "Y", "body_name": "Grip R"}));
+    s.c("solid.mirror", json!({"bodies": ["Grip R"], "plane": "XZ"}));
+    s.root();
+    s.component("Seat");
+    s.tube([-150.0, 0.0, 820.0], [-170.0, 0.0, 960.0], 13.0, "Seatpost");
+    s.c("solid.box", json!({"length": 260, "width": 140, "height": 40, "center": [-180, 0, 980], "body_name": "Saddle"}));
+    s.root();
+    // Fasteners: head, shank and washer, each its own body.
+    s.component("Hardware");
+    let bolts = n(240.0);
+    for k in 0..bolts {
+        let a = std::f64::consts::TAU * k as f64 / bolts as f64;
+        let p = [round3(-300.0 + 2.5 * k as f64), round3(120.0 + 10.0 * a.sin()), round3(400.0 + 10.0 * a.cos())];
+        s.c("solid.cylinder", json!({"radius": 5, "height": 4, "base": p, "axis": "Z", "body_name": format!("Bolt {k} head")}));
+        s.c(
+            "solid.cylinder",
+            json!({"radius": 2.5, "height": 16, "base": [p[0], p[1], round3(p[2] - 16.0)], "axis": "Z", "body_name": format!("Bolt {k} shank")}),
+        );
+        s.c(
+            "solid.cylinder",
+            json!({"radius": 4.5, "height": 1, "base": [p[0], p[1], round3(p[2] - 1.0)], "axis": "Z", "body_name": format!("Bolt {k} washer")}),
+        );
+    }
+    s.root();
+    json!({"commands": s.commands})
+}
+
+pub fn run(args: &[String]) -> Result<(), String> {
+    let flag = |name: &str| args.iter().position(|a| a == name).and_then(|i| args.get(i + 1));
+    let scale = match flag("--scale") {
+        Some(v) => v.parse::<f64>().ok().filter(|v| v.is_finite() && *v > 0.0 && *v <= 20.0).ok_or("--scale takes a number from 0 to 20")?,
+        None => 1.0,
+    };
+    let script = bicycle(scale);
+    if let Some(path) = flag("--script-out") {
+        let text = serde_json::to_string_pretty(&script).map_err(|e| e.to_string())?;
+        return solidcraft_engine::io::vfs::write(path, text.as_bytes()).map_err(|e| format!("{path}: {e}"));
+    }
+    let commands = script["commands"].as_array().cloned().unwrap_or_default();
+    let mut s = Session::default();
+    let began = std::time::Instant::now();
+    // Per command: the command itself, then what a window needs to draw its result (the
+    // bodies placed in the world and their display meshes).
+    let (mut run, mut shown): (Vec<f64>, Vec<f64>) = (Vec::new(), Vec::new());
+    for (i, c) in commands.iter().enumerate() {
+        let id = c["command"].as_str().unwrap_or_default();
+        let t = std::time::Instant::now();
+        s.execute(id, &c["params"]).map_err(|e| format!("command {i} ({id}): {e}"))?;
+        run.push(t.elapsed().as_secs_f64() * 1000.0);
+        let t = std::time::Instant::now();
+        s.world_state().warm_meshes(|| true);
+        shown.push(t.elapsed().as_secs_f64() * 1000.0);
+        if run.len() == 100 || i + 1 == commands.len() {
+            let mean = |v: &[f64]| v.iter().sum::<f64>() / v.len().max(1) as f64;
+            let bodies = s.model.state().bodies.len();
+            println!(
+                "{}",
+                json!({"step": "build", "commands": i + 1, "bodies": bodies, "command_ms": mean(&run), "display_ms": mean(&shown),
+                       "max_ms": run.iter().zip(&shown).map(|(a, b)| a + b).fold(0.0, f64::max)})
+            );
+            run.clear();
+            shown.clear();
+        }
+    }
+    let world = s.world_state();
+    println!(
+        "{}",
+        json!({"step": "built", "ms": began.elapsed().as_secs_f64() * 1000.0, "commands": commands.len(), "features": s.doc.features.len(), "bodies": world.bodies.len()})
+    );
+    let path = match flag("--save") {
+        Some(p) => p.clone(),
+        None => std::env::temp_dir().join(format!("bench-agent-{}.solidcraft", std::process::id())).to_string_lossy().into_owned(),
+    };
+    s.execute("file.save", &json!({"path": path})).map_err(|e| e.to_string())?;
+    let r = crate::cmd_bench_open(std::slice::from_ref(&path));
+    if flag("--save").is_none() {
+        let _ = std::fs::remove_file(&path);
+        let _ = std::fs::remove_file(format!("{path}.bak"));
+    }
+    r
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// The generated commands stay valid as the command set changes: a small bicycle builds
+    /// without a failing command or feature.
+    #[test]
+    fn a_small_bicycle_builds() {
+        let script = bicycle(0.03);
+        let mut s = Session::default();
+        for c in script["commands"].as_array().into_iter().flatten() {
+            let id = c["command"].as_str().unwrap_or_default();
+            if let Err(e) = s.execute(id, &c["params"]) {
+                panic!("{id}: {e}");
+            }
+        }
+        assert!(s.model.results.iter().all(|r| r.error.is_none()));
+        let world = s.world_state();
+        assert!(world.bodies.len() > 40, "{} bodies", world.bodies.len());
+        assert!(world.bodies.iter().any(|b| b.name.contains("spoke")));
+    }
+}

apps/solidcraft-cli/src/main.rs

@@ -1,51 +1,86 @@
 //! SolidCraft headless command line.
 //!
 //! ```text
-//! solidcraft-cli run <script.json|design.solidcraft|part.step|mesh.3mf> [--in design|part.step|mesh.3mf] [--out FILE]... [--save FILE] [--quiet] [--allow-errors]
-//! solidcraft-cli eval <script.json|design.solidcraft|part.step> (alias: inspect) measurements as JSON
-//! solidcraft-cli bench-open <design.solidcraft | part.step> [--parse-only] loading timings as JSON lines
-//! solidcraft-cli snapshot <script|design> --out shot.png [--width W] [--height H] [--view iso|front|top|…]
+//! solidcraft-cli run <script.json|design.solidcraft|part.step|mesh.3mf> [--in design|part.step|mesh.3mf] [--out FILE]... [--save FILE] [--quiet] [--results] [--timings] [--profile] [--json-out FILE] [--allow-errors]
+//! solidcraft-cli eval <script.json|design.solidcraft|part.step> [--json-out FILE] (alias: inspect) measurements as JSON
+//! solidcraft-cli script <design.solidcraft> [--out script.json]     the design's history as a command script
+//! solidcraft-cli bench-open <design.solidcraft | part.step> [--parse-only] [--save OUT.solidcraft] [--display LEVEL [--edit NAME EXPR]] [--ops script.json] loading timings as JSON lines
+//! solidcraft-cli bench-agent [--scale F] [--save F] [--script-out F] a ~1,300-body design built command by command, timed
+//! solidcraft-cli snapshot <script|design> [--in design|part.step] --out shot.png [--width W] [--height H] [--view iso|front|top|…|NAME | --camera JSON] [--no-grid] [--no-axes]
+//!                                                             [--body NAME:opacity=0.3,color=#rrggbb]... [--tool NAME]... [--section z=27]
 //! solidcraft-cli exec <command> [json-params]                 run one command on an empty design
 //! solidcraft-cli commands                                     the command registry as JSON
 //! solidcraft-cli recipe <recipe.json>                         translate an oracle recipe to a script
 //! solidcraft-cli oracle <case-dir>...                         replay recipes and compare with expected.json
-//! solidcraft-cli mcp [--in design|script] [--connect HOST:PORT] MCP server on stdio (docs/mcp.md)
+//! solidcraft-cli mcp [--in design|script] [--connect HOST:PORT [--token T]] [--allow-path DIR]... [--allow-any-path]
+//!                    [--param-check off|warn|strict]
+//!                                                             MCP server on stdio (docs/mcp.md)
 //! solidcraft-cli licences                                     SolidCraft's licence and the third-party licences
 //! solidcraft-cli icon --out F.png|F.ico [--size N]             the app icon (packaging; drawn, not a file)
 //! ```
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod bench_agent;
 mod crashes;
 mod fuzz;
 mod oracle;
+mod preview;
 mod recipe;
+mod render;
 mod spatial;
 
 use std::process::ExitCode;
 
 use serde_json::{Value, json};
-#[path = "../../app_icon.rs"]
+#[path = "../../../assets/icons/app/shared/source/app_icon.rs"]
 mod app_icon;
 
 use solidcraft_engine::Session;
-use solidcraft_engine::render::{StandardView, render_png};
+use solidcraft_engine::view::Guides;
 
 const USAGE: &str = "usage:
-  solidcraft-cli run <script.json|design.solidcraft|part.step> [--in design.solidcraft|part.step] [--out FILE]... [--save FILE] [--quiet] [--results] [--allow-errors]
+  solidcraft-cli run <script.json|design.solidcraft|part.step> [--in design.solidcraft|part.step] [--out FILE]... [--save FILE] [--quiet] [--results] [--timings] [--profile] [--json-out FILE] [--allow-errors]
   solidcraft-cli run --in <design.solidcraft|part.step> [--out FILE]...
       (a timeline feature that fails fails the run and nothing is written; --allow-errors writes anyway)
-  solidcraft-cli eval <script.json|design.solidcraft|part.step>     (alias: inspect; or --in FILE)
-  solidcraft-cli bench-open <design.solidcraft | part.step> [--parse-only]
-  solidcraft-cli snapshot <script|design> --out shot.png [--width W] [--height H] [--view iso|front|back|top|bottom|left|right]
+      (--timings prints {timings: [{index, command, ms}], total_ms} for a script, with --results its results too;
+       --profile adds each command's profile: {boolean_ms, tessellate_ms, other_ms}, the kernel's share)
+  solidcraft-cli eval <script.json|design.solidcraft|part.step> [--json-out FILE]     (alias: inspect; or --in FILE)
+      (--json-out FILE writes the JSON that run (with --results, else the measurement) and eval print to FILE instead of stdout,
+       as plain UTF-8: a shell's > can re-encode it, e.g. Windows PowerShell adds a byte-order mark)
+  solidcraft-cli script <design.solidcraft|script.json> [--out script.json]
+      (the design's history as a command script that eval and run replay)
+  solidcraft-cli bench-open <design.solidcraft | part.step> [--parse-only] [--save OUT.solidcraft] [--display LEVEL [--edit NAME EXPR]] [--ops script.json]
+      (--ops: after opening, run each command of the script and undo it, timing the command, the
+       evaluations it caused and the view it leaves: placing and meshing what changed)
+  solidcraft-cli bench-agent [--scale F] [--save design.solidcraft] [--script-out script.json]
+  solidcraft-cli snapshot <script|design> [--in design.solidcraft|part.step] --out shot.png [--width W] [--height H] [--view NAME | --camera JSON] [--no-grid] [--no-axes]
+      [--body NAME:opacity=0.3,color=#rrggbb]... [--tool NAME]... [--section z=27]
+  solidcraft-cli snapshot --in <design.solidcraft|part.step> --out shot.png ...
+      (as with run, --in starts from a design and the script runs on top of it; an option snapshot doesn't take is an error;
+       --view: iso, front, back, top, bottom, left, right, or the name of a view saved in the design with view.save;
+       --camera: {target: [x,y,z], yaw, pitch, distance, fov?} in mm and radians, as the MCP screenshot takes it (docs/mcp.md);
+       --no-grid and --no-axes leave the ground grid (on Z 0) and the origin's axes out of the picture;
+       --body: how one body is drawn, as appearance.assign takes it: opacity 0-1 (below 1 is see-through, so what is inside
+         it shows) and color #rrggbb, either or both, once per body;
+       --tool: draw this body solid in the tool colour and every other body see-through, so a cut's or a join's tool body
+         is visible inside the material it meets; a later --body overrides it;
+       --section: cut the model as inspect.section does, so the inside shows: z=27 (the plane through that world
+         coordinate, keeping the smaller side), add ,flip to keep the other side, or XY, XZ, YZ, or its own JSON)
+  solidcraft-cli render <script|design> --out image.png [--setup NAME] [--width W] [--height H] [--transparent] [--overwrite] [--timeout SECONDS]
   solidcraft-cli exec <command> [json-params]
   solidcraft-cli commands
   solidcraft-cli recipe <recipe.json>
   solidcraft-cli oracle <case-dir>... [--json]
   solidcraft-cli fuzz [--from N] [--count N] [--jobs J] [--timeout S] [--steps N] [--minimise] [--out DIR] [--report FILE]
-  solidcraft-cli mcp [--in design.solidcraft|script.json] [--connect 127.0.0.1:PORT]
+  solidcraft-cli mcp [--in design.solidcraft|script.json] [--connect 127.0.0.1:PORT [--token T]] [--allow-path DIR]... [--allow-any-path]
+                     [--param-check off|warn|strict]
   solidcraft-cli crashes [list [--json] | show <id> | replay <id> | dir | clear [<id>]]
   solidcraft-cli licences
+  solidcraft-cli gpu [--policy auto|hardware|software|cpu]
+      (the GPU adapters a headless render can open, best first, the one the policy picks and the tier it
+       lands on: gpu, gpu-software, or the CPU rasterizer (auto with no adapter, or cpu); the policy defaults
+       to SOLIDCRAFT_GPU, else auto; exits with an error when hardware or software finds no such adapter)
   solidcraft-cli icon --out icon.png [--size 256] | --out icon.ico
 ";
 
@@ -54,8 +89,11 @@ fn main() -> ExitCode {
     let r = match args.first().map(String::as_str) {
         Some("run") => cmd_run(&args[1..]),
         Some("eval" | "inspect") => cmd_eval(&args[1..]),
+        Some("script") => cmd_script(&args[1..]),
         Some("snapshot") => cmd_snapshot(&args[1..]),
+        Some("render") => render::run(&args[1..]),
         Some("exec") => cmd_exec(&args[1..]),
+        Some("gpu") => cmd_gpu(&args[1..]),
         Some("commands") => {
             use std::io::Write as _;
             let mut s = Session::default();
@@ -90,6 +128,8 @@ fn main() -> ExitCode {
         // Hidden: time recomputes after parameter edits (docs/perf.md).
         Some("bench-edit") => cmd_bench_edit(&args[1..]),
         Some("bench-open") => cmd_bench_open(&args[1..]),
+        // A ~1,300-body design built command by command, as an agent builds one over MCP.
+        Some("bench-agent") => bench_agent::run(&args[1..]),
         Some("--version" | "-V") => {
             println!("solidcraft-cli {}", env!("CARGO_PKG_VERSION"));
             Ok(())
@@ -118,7 +158,14 @@ pub fn read_json(path: &str) -> Result<Value, String> {
 
 /// A session from a design file, a STEP/3MF/STL file, a command script, or an oracle recipe.
 pub fn load(path: &str) -> Result<Session, String> {
+    load_checked(path, solidcraft_engine::schema::ParamCheck::Off)
+}
+
+/// `load`, with scripts and recipes run at the parameter-check level `check`, which the
+/// session keeps.
+fn load_checked(path: &str, check: solidcraft_engine::schema::ParamCheck) -> Result<Session, String> {
     let mut s = Session::default();
+    s.param_check = check;
     if solidcraft_engine::io::is_step_path(path) || solidcraft_engine::io::is_mesh_path(path) {
         s.execute("doc.open", &json!({"path": path})).map_err(|e| e.to_string())?;
         return Ok(s);
@@ -128,16 +175,22 @@ pub fn load(path: &str) -> Result<Session, String> {
         let doc = solidcraft_engine::io::read_design(&bytes).map_err(|e| format!("{path}: {e}"))?;
         let mut session = Session::new(doc);
         session.path = Some(path.to_owned());
+        session.param_check = check;
         return Ok(session);
     }
     let v: Value = serde_json::from_slice(&bytes).map_err(|e| format!("{path}: {e}"))?;
     if v.get("format").and_then(Value::as_str).is_some_and(|f| solidcraft_engine::doc::format::version_of(f).is_some()) {
         s.execute("doc.open", &json!({"path": path})).map_err(|e| e.to_string())?;
-    } else if v.get("features").is_some() && v.get("commands").is_none() {
-        let script = recipe::to_script(&v)?;
-        s.run_script(&script).map_err(|e| e.to_string())?;
     } else {
-        s.run_script(&v).map_err(|e| e.to_string())?;
+        let script = if v.get("features").is_some() && v.get("commands").is_none() { recipe::to_script(&v)? } else { v };
+        // Warn level: each step's `param_warnings` as it completes, even when a later step fails
+        // (stderr, so stdout stays the caller's).
+        let mut warn = |step: usize, r: &Value| {
+            for w in r.get("param_warnings").and_then(Value::as_array).into_iter().flatten() {
+                eprintln!("{path}: step {}: {}", step + 1, w.as_str().unwrap_or_default());
+            }
+        };
+        s.run_script_each(&script, &mut warn).map_err(|e| e.to_string())?;
     }
     Ok(s)
 }
@@ -155,7 +208,11 @@ fn positional(args: &[String]) -> Option<&String> {
     let mut i = 0;
     while let Some(a) = args.get(i) {
         if a.starts_with("--") {
-            i += if matches!(a.as_str(), "--quiet" | "--results" | "--allow-errors") { 1 } else { 2 };
+            i += if matches!(a.as_str(), "--quiet" | "--results" | "--timings" | "--profile" | "--allow-errors" | "--no-grid" | "--no-axes") {
+                1
+            } else {
+                2
+            };
             continue;
         }
         return Some(a);
@@ -163,32 +220,66 @@ fn positional(args: &[String]) -> Option<&String> {
     None
 }
 
+/// `--json-out FILE`: where the JSON a command prints goes instead of stdout.
+fn json_out(args: &[String]) -> Result<Option<&str>, String> {
+    if !args.iter().any(|a| a == "--json-out") {
+        return Ok(None);
+    }
+    match flag(args, "--json-out") {
+        Some(file) if !file.starts_with("--") => Ok(Some(file)),
+        _ => Err("--json-out needs a FILE".to_string()),
+    }
+}
+
+/// `v` as indented JSON with a final newline: on stdout, or in `file`. The file is plain UTF-8
+/// with no byte-order mark, whatever the platform's shell does to redirected output (Windows
+/// PowerShell's `>` writes UTF-16, or UTF-8 with a BOM), so strict JSON readers take it.
+fn print_json(v: &Value, file: Option<&str>) -> Result<(), String> {
+    match file {
+        Some(file) => {
+            let mut text = pretty(v);
+            text.push('\n');
+            std::fs::write(file, text).map_err(|e| format!("{file}: {e}"))
+        }
+        None => {
+            println!("{}", pretty(v));
+            Ok(())
+        }
+    }
+}
+
 fn cmd_run(args: &[String]) -> Result<(), String> {
+    install_renderer();
+    let json_out = json_out(args)?;
     let base = flag(args, "--in");
     let path = positional(args);
     if path.is_none() && base.is_none() {
         return Err(USAGE.to_string());
     }
-    // `--in` starts from a design or STEP file; the positional script then runs on top of it.
-    let mut s = match base {
-        Some(b) => load(b)?,
-        None => Session::default(),
-    };
-    let results = if args.iter().any(|a| a == "--results") {
-        // Collect every command's result (scripts only), then process requested files too.
-        let v = read_json(path.ok_or("--results needs a script")?)?;
-        let r = s.run_script(&v).map_err(|e| e.to_string())?;
-        Some(Value::Array(r))
-    } else {
-        match (base, path) {
-            (Some(_), Some(p)) => {
-                let v = read_json(p)?;
-                s.run_script(&v).map_err(|e| e.to_string())?;
+    let want_results = args.iter().any(|a| a == "--results");
+    // `--profile` times each command and splits out its kernel time; it implies `--timings`.
+    let profile = args.iter().any(|a| a == "--profile");
+    let timings = profile || args.iter().any(|a| a == "--timings");
+    let (mut s, results) = if want_results || timings {
+        // Collect every command's result or time (scripts only), then process requested files too.
+        let mut s = match base {
+            Some(b) => load(b)?,
+            None => Session::default(),
+        };
+        let needs = if want_results { "--results needs a script" } else { "--timings needs a script" };
+        let v = read_json(path.ok_or(needs)?)?;
+        let out = if timings {
+            let (r, mut t) = s.run_script_timed(&v, profile).map_err(|e| e.to_string())?;
+            if want_results && let Some(o) = t.as_object_mut() {
+                o.insert("results".into(), Value::Array(r));
             }
-            (None, Some(p)) => s = load(p)?,
-            _ => {}
-        }
-        None
+            t
+        } else {
+            Value::Array(s.run_script(&v).map_err(|e| e.to_string())?)
+        };
+        (s, Some(out))
+    } else {
+        (open(base, path)?, None)
     };
     // A feature that fails leaves the bodies as they were before it (a parameter change can
     // break a feature without failing the command that made it): writing them would hand out
@@ -203,10 +294,45 @@ fn cmd_run(args: &[String]) -> Result<(), String> {
         s.execute("file.save_as", &json!({"path": p})).map_err(|e| e.to_string())?;
     }
     if let Some(results) = results {
-        println!("{}", pretty(&results));
-    } else if !args.iter().any(|a| a == "--quiet") {
+        print_json(&results, json_out)?;
+    } else if json_out.is_some() || !args.iter().any(|a| a == "--quiet") {
+        // `--quiet` silences stdout; a file that was asked for is still written.
         let m = s.execute("inspect.measure", &json!({})).map_err(|e| e.to_string())?;
-        println!("{}", pretty(&m));
+        print_json(&m, json_out)?;
+    }
+    Ok(())
+}
+
+/// The session `run` and `snapshot` start from: `--in` (a design or STEP file) with the
+/// positional script run on top of it, or either one alone.
+fn open(base: Option<&str>, path: Option<&String>) -> Result<Session, String> {
+    match (base, path) {
+        (Some(b), Some(p)) => {
+            let mut s = load(b)?;
+            s.run_script(&read_json(p)?).map_err(|e| e.to_string())?;
+            Ok(s)
+        }
+        (Some(b), None) => load(b),
+        (None, Some(p)) => load(p),
+        (None, None) => Err(USAGE.to_string()),
+    }
+}
+
+/// Refuses an option `cmd` doesn't take, and one missing its value: a typo, or another
+/// command's option, would otherwise be ignored without a word.
+fn known_flags(cmd: &str, args: &[String], valued: &[&str], switches: &[&str]) -> Result<(), String> {
+    let mut i = 0;
+    while let Some(a) = args.get(i) {
+        if valued.contains(&a.as_str()) {
+            match args.get(i + 1) {
+                Some(v) if !v.starts_with("--") => i += 2,
+                _ => return Err(format!("{cmd}: {a} needs a value")),
+            }
+        } else if a.starts_with("--") && !switches.contains(&a.as_str()) {
+            return Err(format!("{cmd} doesn't take {a} (it takes {})", [valued, switches].concat().join(", ")));
+        } else {
+            i += 1;
+        }
     }
     Ok(())
 }
@@ -225,6 +351,7 @@ fn timeline_ok(s: &Session) -> Result<(), String> {
 }
 
 fn cmd_eval(args: &[String]) -> Result<(), String> {
+    let json_out = json_out(args)?;
     let path = flag(args, "--in").or_else(|| positional(args).map(String::as_str)).ok_or_else(|| USAGE.to_string())?;
     let mut s = load(path)?;
     let m = s.execute("inspect.measure", &json!({})).map_err(|e| e.to_string())?;
@@ -237,24 +364,118 @@ fn cmd_eval(args: &[String]) -> Result<(), String> {
         "params": d["params"],
         "sketches": d["sketches"],
     });
-    println!("{}", pretty(&out));
+    print_json(&out, json_out)
+}
+
+/// A design's history as a command script (`timeline.export_script`): printed, or written to
+/// `--out`; what the script leaves out goes to stderr.
+fn cmd_script(args: &[String]) -> Result<(), String> {
+    let path = positional(args).ok_or_else(|| USAGE.to_string())?;
+    let s = &mut load(path)?;
+    let out = flag(args, "--out");
+    let r = s.execute("timeline.export_script", &json!({"path": out})).map_err(|e| e.to_string())?;
+    for what in r["omitted"].as_array().into_iter().flatten().filter_map(Value::as_str) {
+        eprintln!("note: the script leaves out {what}");
+    }
+    match out {
+        Some(out) => eprintln!("{out}: {} steps", r["steps"]),
+        None => println!("{}", pretty(&r["script"])),
+    }
     Ok(())
 }
 
-fn cmd_snapshot(args: &[String]) -> Result<(), String> {
-    let path = args.first().ok_or_else(|| USAGE.to_string())?;
-    let out = flag(args, "--out").ok_or("snapshot needs --out FILE.png")?;
-    let w = flag(args, "--width").and_then(|x| x.parse().ok()).unwrap_or(1280usize);
-    let h = flag(args, "--height").and_then(|x| x.parse().ok()).unwrap_or(800usize);
-    let s = load(path)?;
-    let mut cam = solidcraft_engine::view::home_camera(&s);
-    if let Some(v) = flag(args, "--view") {
-        cam.set_view(StandardView::parse(v).ok_or_else(|| format!("unknown view `{v}`"))?);
+/// `gpu`: the headless adapter survey and the policy's pick.
+fn cmd_gpu(args: &[String]) -> Result<(), String> {
+    use solidcraft_gpu::select::{Policy, survey};
+    let policy = match args {
+        [] => Policy::from_env()?,
+        [flag, v] if flag == "--policy" => Policy::parse(v).ok_or_else(|| format!("--policy must be auto, hardware, software or cpu, not `{v}`"))?,
+        _ => return Err("usage: solidcraft-cli gpu [--policy auto|hardware|software|cpu]".into()),
+    };
+    let s = survey(policy);
+    let chosen = s.chosen.and_then(|i| s.adapters.get(i)).cloned();
+    // The tier pictures land on: a hardware GPU, a software adapter, or the CPU rasterizer.
+    let renderer = s.lands_on.map(|l| l.renderer());
+    println!(
+        "{}",
+        pretty(&json!({
+            "policy": policy.name(),
+            "backends": s.backends,
+            "adapters": s.adapters,
+            "chosen": chosen,
+            "lands_on": s.lands_on,
+            "renderer": renderer,
+        }))
+    );
+    match s.lands_on {
+        Some(solidcraft_gpu::select::Landing::Cpu) => {
+            eprintln!("warning: {}", solidcraft_engine::capture::CPU_WARNING);
+            Ok(())
+        }
+        Some(_) => Ok(()),
+        None => Err(format!("no adapter qualifies under the {} policy", policy.name())),
     }
-    let scene = solidcraft_engine::view::scene(&s, &cam);
-    let png = render_png(&scene, &cam, w, h).ok_or("render failed")?;
-    std::fs::write(out, &png).map_err(|e| format!("{out}: {e}"))?;
-    println!("{}", pretty(&json!({"path": out, "width": w, "height": h, "bytes": png.len()})));
+}
+
+/// Draw this process's pictures (snapshots, MCP screenshots, saved thumbnails) on the GPU with the
+/// viewport's pipelines: the headless device the `SOLIDCRAFT_GPU` policy picks, opened on the first
+/// picture; under `auto` with no qualifying adapter (or `cpu`), the CPU rasterizer, and the
+/// picture says so. Under `hardware` or `software` with no such adapter a picture fails with an
+/// error that names the policy.
+fn install_renderer() {
+    solidcraft_engine::capture::install(std::sync::Arc::new(|scene, cam, w, h| {
+        let (rgba, renderer) = solidcraft_gpu::capture::headless_rgba(scene, cam, w, h)?;
+        Ok(solidcraft_engine::capture::Picture { rgba, renderer })
+    }));
+}
+
+fn cmd_snapshot(args: &[String]) -> Result<(), String> {
+    install_renderer();
+    known_flags(
+        "snapshot",
+        args,
+        &["--in", "--out", "--width", "--height", "--view", "--camera", "--body", "--tool", "--section"],
+        &["--no-grid", "--no-axes"],
+    )?;
+    if positional(args).is_none() && flag(args, "--in").is_none() {
+        return Err(USAGE.to_string());
+    }
+    let out = flag(args, "--out").ok_or("snapshot needs --out FILE.png")?;
+    let size = |name: &str, default: u32| match flag(args, name) {
+        None => Ok(default),
+        Some(x) => x.parse().ok().filter(|n| (16..=8192).contains(n)).ok_or_else(|| format!("{name} must be 16 to 8192 pixels, not `{x}`")),
+    };
+    let (w, h) = (size("--width", 1280)?, size("--height", 800)?);
+    let mut s = open(flag(args, "--in"), positional(args))?;
+    // How the bodies are drawn and where the model is cut, through the commands the app's
+    // Appearance dialog and Section Analysis run (`preview`).
+    preview::apply(&mut s, &flags(args, "--body"), &flags(args, "--tool"), flag(args, "--section"))?;
+    // The camera choices of the MCP `screenshot`, through the same command (`view.apply`): a
+    // standard view, a view saved in the design, or an explicit camera. A script that applies a
+    // view itself sets the camera too; without any, the iso view framing the model.
+    match (flag(args, "--view"), flag(args, "--camera")) {
+        (Some(_), Some(_)) => return Err("snapshot: give --view or --camera, not both".into()),
+        (Some(v), None) => {
+            let hint = "standard views: iso, front, back, top, bottom, left, right";
+            s.execute("view.apply", &json!({"view": v})).map_err(|e| format!("--view {v}: {e} ({hint}; or a view saved with view.save)"))?;
+        }
+        (None, Some(c)) => {
+            let camera: Value = serde_json::from_str(c).map_err(|e| format!("--camera: not JSON: {e}"))?;
+            s.execute("view.apply", &json!({"camera": camera})).map_err(|e| format!("--camera: {e}"))?;
+        }
+        (None, None) => {}
+    }
+    let cam = s.camera.unwrap_or_else(|| solidcraft_engine::view::home_camera(&s));
+    let guides = Guides { grid: !args.iter().any(|a| a == "--no-grid"), axes: !args.iter().any(|a| a == "--no-axes") };
+    let scene = solidcraft_engine::view::scene_with_guides(&s, &cam, s.section, guides);
+    let png = solidcraft_engine::capture::png(&scene, &cam, w, h)?;
+    std::fs::write(out, &png.bytes).map_err(|e| format!("{out}: {e}"))?;
+    let mut reply = json!({"path": out, "width": w, "height": h, "bytes": png.bytes.len(), "renderer": png.renderer});
+    if let Some(w) = solidcraft_engine::capture::warning(png.renderer) {
+        eprintln!("warning: {w}");
+        reply["warning"] = json!(w);
+    }
+    println!("{}", pretty(&reply));
     Ok(())
 }
 
@@ -300,6 +521,7 @@ fn ico(images: &[(usize, Vec<u8>)]) -> Result<Vec<u8>, String> {
 }
 
 fn cmd_exec(args: &[String]) -> Result<(), String> {
+    install_renderer();
     let id = args.first().ok_or_else(|| USAGE.to_string())?;
     let p: Value = match args.get(1) {
         Some(t) => serde_json::from_str(t).map_err(|e| format!("params: {e}"))?,
@@ -312,23 +534,62 @@ fn cmd_exec(args: &[String]) -> Result<(), String> {
 }
 
 /// MCP server on stdio: headless (optionally starting from a design or script) or bridged to
-/// a running app's control port. stdout carries only protocol messages.
+/// a running app's control port. stdout carries only protocol messages. Files the agent's tool
+/// calls reach are confined to `solidcraft_mcp::agent_scope` unless `--allow-any-path` is given.
 fn cmd_mcp(args: &[String]) -> Result<(), String> {
+    install_renderer();
+    let scope = (!args.iter().any(|a| a == "--allow-any-path"))
+        .then(|| solidcraft_mcp::agent_scope(flags(args, "--allow-path").into_iter().map(std::path::PathBuf::from)));
+    if let Some(s) = &scope {
+        let roots: Vec<String> = s.roots().iter().map(|r| r.display().to_string()).collect();
+        eprintln!(
+            "solidcraft mcp: files limited to {} and the open design's folder (--allow-path DIR adds one, --allow-any-path lifts the limit)",
+            roots.join(", ")
+        );
+        let design_dir = flag(args, "--in")
+            .and_then(|p| std::path::Path::new(p).parent())
+            .map(|d| if d.as_os_str().is_empty() { std::path::Path::new(".") } else { d });
+        if let Some(why) = design_dir.and_then(solidcraft_engine::io::vfs::design_folder_refusal) {
+            eprintln!("solidcraft mcp: the design's folder is left out because {why}; add it with --allow-path if you mean it");
+        }
+    }
+    // How a headless session treats calls that break a command's parameter contract (docs/mcp.md).
+    let param_check = match flag(args, "--param-check") {
+        None if args.iter().any(|a| a == "--param-check") => return Err("mcp: --param-check wants off, warn or strict".into()),
+        None => solidcraft_engine::schema::ParamCheck::Off,
+        Some(v) => {
+            solidcraft_engine::schema::ParamCheck::parse(v).ok_or_else(|| format!("mcp: --param-check wants off, warn or strict, not `{v}`"))?
+        }
+    };
+    if param_check != solidcraft_engine::schema::ParamCheck::Off && flag(args, "--connect").is_some() {
+        eprintln!("solidcraft mcp: --param-check applies to headless sessions; calls to the app are not checked yet");
+    }
     let backend: Box<dyn solidcraft_mcp::Backend> = match (flag(args, "--connect"), flag(args, "--in")) {
         (Some(_), Some(_)) => return Err("mcp: use either --connect or --in, not both".into()),
-        (Some(addr), None) => Box::new(solidcraft_mcp::Remote::connect(addr).map_err(|e| {
-            let port = addr.rsplit(':').next().filter(|p| p.parse::<u16>().is_ok()).unwrap_or("PORT");
-            format!(
-                "cannot connect to {addr}: {e}\nno SolidCraft app is listening there; start it with \
-                 `solidcraft --control {port}` (or SOLIDCRAFT_CONTROL_PORT={port}) and retry"
-            )
-        })?),
-        (None, Some(path)) => Box::new(solidcraft_mcp::Headless::new(load(path)?)),
-        (None, None) => Box::new(solidcraft_mcp::Headless::default()),
+        (Some(addr), None) => {
+            let Some(port) = addr.rsplit_once(':').and_then(|(_, p)| p.parse::<u16>().ok()).filter(|p| *p != 0) else {
+                return Err(format!("mcp: --connect wants HOST:PORT, such as 127.0.0.1:7878, not `{addr}`"));
+            };
+            // Serve without the app too: the tools connect once it runs, and say it isn't until then.
+            let mut remote = solidcraft_mcp::Remote::new(addr, flag(args, "--token"));
+            if let Err(e) = remote.try_connect() {
+                eprintln!(
+                    "solidcraft mcp: no SolidCraft app at {addr} yet ({e}); start it with `solidcraft --control {port}` \
+                     (or SOLIDCRAFT_CONTROL_PORT={port}), tool calls connect once it runs"
+                );
+            }
+            Box::new(remote)
+        }
+        (None, Some(path)) => Box::new(solidcraft_mcp::Headless::new(load_checked(path, param_check)?)),
+        (None, None) => {
+            let mut headless = solidcraft_mcp::Headless::default();
+            headless.session.param_check = param_check;
+            Box::new(headless)
+        }
     };
     let stdin = std::io::stdin();
     let stdout = std::io::stdout();
-    solidcraft_mcp::Server::new(backend).serve(stdin.lock(), stdout.lock()).map_err(|e| e.to_string())
+    solidcraft_mcp::Server::new(backend).with_path_scope(scope).serve(stdin.lock(), stdout.lock()).map_err(|e| e.to_string())
 }
 
 /// `save-stress <path> <rounds>`: save a design of a few hundred kilobytes `rounds` times, its
@@ -383,8 +644,38 @@ fn cmd_bench_edit(args: &[String]) -> Result<(), String> {
     Ok(())
 }
 
+/// `bench-open --ops`: each command of `script` (a JSON array of `{command, params}`), then its
+/// undo, each timed as the command and the view it leaves (the placed model, its meshes warmed
+/// as the desktop does after a change).
+fn bench_ops(mut s: Session, script: &str) -> Result<Session, String> {
+    let text = std::fs::read_to_string(script).map_err(|e| format!("{script}: {e}"))?;
+    let ops: Value = serde_json::from_str(&text).map_err(|e| format!("{script}: {e}"))?;
+    let ops = ops.as_array().ok_or("--ops: a JSON array of {command, params}")?;
+    let time = |s: &mut Session, id: &str, p: &Value| -> Result<Value, String> {
+        let t = std::time::Instant::now();
+        let r = s.execute(id, p).map_err(|e| format!("{id}: {e}"))?;
+        let ms = t.elapsed().as_secs_f64() * 1000.0;
+        let t = std::time::Instant::now();
+        s.world_state().warm_meshes(|| true);
+        let view_ms = t.elapsed().as_secs_f64() * 1000.0;
+        println!("{}", json!({"step": "op", "command": id, "ms": ms, "view_ms": view_ms}));
+        Ok(r)
+    };
+    for op in ops {
+        let id = op.get("command").and_then(Value::as_str).ok_or("--ops: each step needs a `command`")?;
+        let p = op.get("params").cloned().unwrap_or(Value::Null);
+        let steps = s.undo.len();
+        time(&mut s, id, &p)?;
+        // Commands that are no undo step (showing and hiding) have nothing to undo.
+        if op.get("undo").and_then(Value::as_bool) != Some(false) && s.undo.len() > steps {
+            time(&mut s, "edit.undo", &json!({}))?;
+        }
+    }
+    Ok(s)
+}
+
 /// Separate file reading, JSON decoding/repair, timeline evaluation and display meshing.
-fn cmd_bench_open(args: &[String]) -> Result<(), String> {
+pub(crate) fn cmd_bench_open(args: &[String]) -> Result<(), String> {
     let path = args.first().ok_or("usage: solidcraft-cli bench-open <design.solidcraft | part.step> [--parse-only]")?;
     let t = std::time::Instant::now();
     let step = solidcraft_engine::io::is_step_path(path);
@@ -393,28 +684,112 @@ fn cmd_bench_open(args: &[String]) -> Result<(), String> {
     let read_ms = t.elapsed().as_secs_f64() * 1000.0;
     println!("{}", json!({"step": "read", "ms": read_ms, "bytes": bytes.len()}));
     let t = std::time::Instant::now();
-    let doc = if step {
+    // The file as read, held until the timeline has evaluated it (as the import command does).
+    let mut read = None;
+    let (doc, saved) = if step {
         let imported = solidcraft_engine::io::step_import_feature(&bytes, path).map_err(|e| e.to_string())?;
         let mut doc = solidcraft_engine::doc::Document::new(&imported.name);
         doc.add_feature(imported.kind, Some(&imported.name)).map_err(|e| e.to_string())?;
-        doc
+        read = Some(imported.import);
+        (doc, None)
     } else {
-        solidcraft_engine::io::read_design(&bytes).map_err(|e| e.to_string())?
+        // As Open reads it: with the model the file keeps.
+        solidcraft_engine::io::read_design_file(path, None::<fn(solidcraft_engine::io::DesignPreview)>).map_err(|e| e.to_string())?
     };
     let parse_ms = t.elapsed().as_secs_f64() * 1000.0;
-    println!("{}", json!({"step": "parse", "ms": parse_ms, "features": doc.features.len()}));
+    println!("{}", json!({"step": "parse", "ms": parse_ms, "features": doc.features.len(), "saved_model": saved.is_some()}));
     if args.iter().any(|a| a == "--parse-only") {
         return Ok(());
     }
     let t = std::time::Instant::now();
-    let s = Session::new(doc);
-    println!("{}", json!({"step": "evaluate", "ms": t.elapsed().as_secs_f64() * 1000.0}));
+    let s = Session::opened(doc, saved.as_ref());
+    drop(read);
+    // Taken from the file: nothing evaluated (SOLIDCRAFT_NO_MODEL_CACHE evaluates anyway).
+    let adopted = saved.is_some() && s.model.last_recomputed == 0;
+    println!("{}", json!({"step": "evaluate", "ms": t.elapsed().as_secs_f64() * 1000.0, "adopted": adopted}));
     for r in &s.model.results {
         println!("{}", json!({"step": "feature", "id": r.id, "name": r.name, "ms": r.ms, "error": r.error}));
     }
     let t = std::time::Instant::now();
     let st = s.world_state();
+    let place_ms = t.elapsed().as_secs_f64() * 1000.0;
+    // As the desktop app prepares a design it opened.
+    st.warm_meshes(|| true);
     let triangles: usize = st.bodies.iter().map(|b| b.mesh().triangles.len()).sum();
-    println!("{}", json!({"step": "mesh", "ms": t.elapsed().as_secs_f64() * 1000.0, "bodies": st.bodies.len(), "triangles": triangles}));
+    println!(
+        "{}",
+        json!({"step": "mesh", "ms": t.elapsed().as_secs_f64() * 1000.0, "place_ms": place_ms, "bodies": st.bodies.len(), "triangles": triangles})
+    );
+    let flag = |name: &str| args.iter().position(|a| a == name);
+    // `--save PATH`: save the opened design without its model cache (to PATH.plain.solidcraft) and
+    // as the app does, with it, then read the cache back.
+    let s = match flag("--save").and_then(|i| args.get(i + 1)) {
+        Some(out) => {
+            let mut s = s;
+            // Without the cache first, for comparison.
+            let plain = format!("{out}.plain.solidcraft");
+            let t = std::time::Instant::now();
+            s.execute("file.save_as", &json!({"path": plain, "cache": false})).map_err(|e| e.to_string())?;
+            let plain_ms = t.elapsed().as_secs_f64() * 1000.0;
+            let plain_bytes = std::fs::metadata(&plain).map(|m| m.len()).unwrap_or(0);
+            let t = std::time::Instant::now();
+            s.execute("file.save_as", &json!({"path": out})).map_err(|e| e.to_string())?;
+            let save_ms = t.elapsed().as_secs_f64() * 1000.0;
+            let bytes = std::fs::read(out).map_err(|e| format!("{out}: {e}"))?;
+            let t = std::time::Instant::now();
+            let cached = solidcraft_engine::io::read_design_geometry(&bytes).map(|m| m.bodies.len());
+            let read_ms = t.elapsed().as_secs_f64() * 1000.0;
+            // Why bodies could not be kept exactly, when the cache was left out.
+            let mut refused = std::collections::BTreeMap::<String, usize>::new();
+            if cached.is_none() {
+                for b in &s.model.state().bodies {
+                    if let Err(e) = solidcraft_engine::kernel::encode_native_body(&b.body) {
+                        *refused.entry(e.to_string()).or_default() += 1;
+                    }
+                }
+            }
+            println!(
+                "{}",
+                json!({"step": "save", "ms": save_ms, "bytes": bytes.len(), "plain_ms": plain_ms, "plain_bytes": plain_bytes, "cached_bodies": cached, "cache_read_ms": read_ms, "refused": refused})
+            );
+            s
+        }
+        None => s,
+    };
+    // `--display LEVEL`: the display plans the viewport draws at that display quality, made as
+    // the GPU viewport makes them; `--edit NAME EXPR` then changes a parameter and times the
+    // evaluation and the plans of the bodies it changed.
+    let s = match flag("--ops").and_then(|i| args.get(i + 1)) {
+        Some(ops) => bench_ops(s, ops)?,
+        None => s,
+    };
+    let Some(level) = flag("--display").and_then(|i| args.get(i + 1)) else { return Ok(()) };
+    let q = solidcraft_engine::doc::display_quality::DisplayQuality::parse(level).ok_or("--display: coarse, normal, fine or ultra")?;
+    let plans = |st: &solidcraft_engine::doc::ModelState| {
+        let t = std::time::Instant::now();
+        solidcraft_engine::kernel::for_each_on_threads(&st.bodies, 16, |b| {
+            let _ = b.plan_mesh_at(q);
+        });
+        let triangles: usize = st.bodies.iter().filter_map(|b| b.plan_mesh_at(q)).map(|m| m.triangles.len()).sum();
+        (t.elapsed().as_secs_f64() * 1000.0, triangles)
+    };
+    let (ms, triangles) = plans(&st);
+    println!("{}", json!({"step": "display", "quality": q.id(), "ms": ms, "triangles": triangles}));
+    if let Some(i) = flag("--edit") {
+        let (Some(name), Some(expr)) = (args.get(i + 1), args.get(i + 2)) else { return Err("--edit NAME EXPR".into()) };
+        let mut s = s;
+        let t = std::time::Instant::now();
+        s.execute("parameters.change", &json!({"name": name, "expression": expr})).map_err(|e| e.to_string())?;
+        let eval_ms = t.elapsed().as_secs_f64() * 1000.0;
+        let st = s.world_state();
+        let t = std::time::Instant::now();
+        st.warm_meshes(|| true);
+        let mesh_ms = t.elapsed().as_secs_f64() * 1000.0;
+        let (ms, triangles) = plans(&st);
+        println!(
+            "{}",
+            json!({"step": "edit", "quality": q.id(), "evaluate_ms": eval_ms, "mesh_ms": mesh_ms, "display_ms": ms, "triangles": triangles})
+        );
+    }
     Ok(())
 }

apps/solidcraft-cli/src/preview.rs

@@ -0,0 +1,286 @@
+//! What a `snapshot` draws see-through, what it draws in a colour of its own, and where it cuts
+//! the model: the `--body`, `--tool` and `--section` options.
+//!
+//! None of this is a renderer of its own. Each option turns into the command the app itself runs
+//! — `appearance.assign` for the Appearance dialog, `inspect.section` for Section Analysis — so
+//! a picture of a tool body inside a translucent target is the picture the window would show
+//! with the same appearances assigned, and a script can do the same thing without the options.
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+
+/// How see-through the bodies around a `--tool` are drawn: enough to read the tool through them,
+/// solid enough to keep the shape of the material it meets.
+pub const TARGET_OPACITY: f64 = 0.3;
+
+/// A `--tool` body's colour: the hue the viewport's feature preview uses for removed material,
+/// so a cut's tool looks in a picture the way the preview looks in the window.
+pub const TOOL_COLOR: &str = "#e8542c";
+
+/// The colour of a body with no appearance of its own ([`solidcraft_engine::view::colors::BODY`]),
+/// as `appearance.assign` takes it. Giving a body an opacity means giving it a look, and a look
+/// carries a colour: this keeps the one it is already drawn in.
+fn default_body_hex() -> String {
+    let c = solidcraft_engine::view::colors::BODY;
+    format!("#{:02x}{:02x}{:02x}", c.0, c.1, c.2)
+}
+
+/// How one body is drawn: `--body NAME:opacity=0.3,color=#cc3333`. Either key alone is enough;
+/// the other keeps what the design already says.
+#[derive(Debug, PartialEq)]
+pub struct BodyLook {
+    pub name: String,
+    pub opacity: Option<f64>,
+    pub color: Option<String>,
+}
+
+/// `NAME:key=value[,key=value]`, or `NAME` on its own (which says nothing and is an error:
+/// a body is named here to change how it is drawn).
+pub fn parse_body(spec: &str) -> Result<BodyLook, String> {
+    let (name, rest) = spec
+        .split_once(':')
+        .ok_or_else(|| format!("--body `{spec}` must be NAME:key=value (`Target:opacity=0.3`, `Tool:color=#cc3333`, keys separated by commas)"))?;
+    let name = name.trim();
+    if name.is_empty() {
+        return Err(format!("--body `{spec}` names no body"));
+    }
+    let mut look = BodyLook { name: name.to_owned(), opacity: None, color: None };
+    for part in rest.split(',') {
+        let part = part.trim();
+        if part.is_empty() {
+            continue;
+        }
+        let (key, value) = part.split_once('=').ok_or_else(|| format!("--body {name}: `{part}` must be key=value (opacity, color)"))?;
+        let value = value.trim();
+        match key.trim().to_ascii_lowercase().as_str() {
+            "opacity" => {
+                let o: f64 = value.parse().map_err(|_| format!("--body {name}: opacity must be a number 0 to 1, not `{value}`"))?;
+                if !o.is_finite() || !(0.0..=1.0).contains(&o) {
+                    return Err(format!("--body {name}: opacity must be 0 to 1, not `{value}`"));
+                }
+                look.opacity = Some(o);
+            }
+            "color" => {
+                let digits = value.strip_prefix('#').filter(|h| h.len() == 6 && h.chars().all(|c| c.is_ascii_hexdigit()));
+                let digits = digits.ok_or_else(|| format!("--body {name}: color must be #rrggbb, not `{value}`"))?;
+                look.color = Some(format!("#{}", digits.to_ascii_lowercase()));
+            }
+            other => return Err(format!("--body {name}: unknown key `{other}` (opacity, color)")),
+        }
+    }
+    if look.opacity.is_none() && look.color.is_none() {
+        return Err(format!("--body `{spec}` asks for nothing: give opacity, color, or both"));
+    }
+    Ok(look)
+}
+
+/// The `inspect.section` parameters a `--section` spec asks for: `z=27` (the plane through that
+/// world coordinate, its normal along +Z), `XY` (a named plane through the origin), either with
+/// `,flip` to keep the other side, or the command's own JSON object.
+pub fn parse_section(spec: &str) -> Result<Value, String> {
+    let spec = spec.trim();
+    if spec.starts_with('{') {
+        return serde_json::from_str(spec).map_err(|e| format!("--section: not JSON: {e}"));
+    }
+    let mut parts = spec.split(',').map(str::trim);
+    let plane = parts.next().unwrap_or_default();
+    let mut flip = false;
+    for p in parts {
+        match p.to_ascii_lowercase().as_str() {
+            "" => {}
+            "flip" => flip = true,
+            other => return Err(format!("--section: unknown `{other}` (only `flip` follows the plane)")),
+        }
+    }
+    // A named plane through the world origin, as `inspect.section` takes it.
+    let mut params = match plane.to_ascii_uppercase().as_str() {
+        p @ ("XY" | "XZ" | "YZ") => json!({"plane": p}),
+        _ => {
+            // AXIS=VALUE: the plane whose normal is that axis, cutting at that world coordinate.
+            let (axis, at) = plane.split_once('=').ok_or_else(|| {
+                format!("--section `{spec}` must be z=27 (a world coordinate on an axis), XY, XZ, YZ, or the JSON inspect.section takes")
+            })?;
+            let at: f64 = at.trim().parse().map_err(|_| format!("--section {axis}: `{}` is not a number", at.trim()))?;
+            if !at.is_finite() {
+                return Err(format!("--section {axis}: `{at}` is not a finite coordinate"));
+            }
+            // The plane normal to each axis: Z is XY, Y is XZ, X is YZ.
+            let named = match axis.trim().to_ascii_lowercase().as_str() {
+                "x" => "YZ",
+                "y" => "XZ",
+                "z" => "XY",
+                other => return Err(format!("--section: unknown axis `{other}` (x, y or z)")),
+            };
+            json!({"plane": named, "at": at})
+        }
+    };
+    if flip {
+        params["flip"] = json!(true);
+    }
+    Ok(params)
+}
+
+/// The design's body names, for an error that says which ones there are.
+fn body_names(s: &Session) -> Vec<String> {
+    s.model.state().bodies.iter().map(|b| b.name.clone()).collect()
+}
+
+/// The colour and opacity a body is drawn with now, as `appearance.assign` takes them: its own
+/// appearance, else its component's or material's, else the default body colour.
+fn current_look(s: &mut Session, name: &str) -> Result<(String, f64), String> {
+    let reply = s.execute("appearance.list", &json!({"body": name})).map_err(|e| e.to_string())?;
+    let body = reply.get("body");
+    let look = body.and_then(|b| b.get("appearance")).filter(|a| !a.is_null());
+    let hex = look
+        .and_then(|a| a.get("color"))
+        .and_then(Value::as_str)
+        .map(str::to_owned)
+        // No appearance, but an imported colour: `body.color` is that colour, 0..1 per channel.
+        .or_else(|| {
+            let c = body?.get("color")?.as_array()?;
+            let ch = |i: usize| -> Option<u8> { Some((c.get(i)?.as_f64()?.clamp(0.0, 1.0) * 255.0).round() as u8) };
+            Some(format!("#{:02x}{:02x}{:02x}", ch(0)?, ch(1)?, ch(2)?))
+        })
+        .unwrap_or_else(default_body_hex);
+    let opacity = look.and_then(|a| a.get("opacity")).and_then(Value::as_f64).filter(|o| o.is_finite()).unwrap_or(1.0);
+    Ok((hex, opacity))
+}
+
+/// Draw `name` with `look`, keeping whichever of colour and opacity it does not give.
+fn assign(s: &mut Session, look: &BodyLook) -> Result<(), String> {
+    let name = &look.name;
+    if !body_names(s).iter().any(|b| b == name) {
+        return Err(format!("no body `{name}` in the design (it has {})", body_list(s)));
+    }
+    let (hex, opacity) = current_look(s, name)?;
+    let params = json!({
+        "bodies": [name],
+        "color": look.color.clone().unwrap_or(hex),
+        "opacity": look.opacity.unwrap_or(opacity),
+    });
+    s.execute("appearance.assign", &params).map(|_| ()).map_err(|e| format!("drawing `{name}`: {e}"))
+}
+
+/// The design's bodies, named, for an error message.
+fn body_list(s: &Session) -> String {
+    let names = body_names(s);
+    if names.is_empty() { "no bodies".to_owned() } else { names.join(", ") }
+}
+
+/// Apply the options to the session, in the order a later one overrides an earlier: the `--tool`
+/// preview first (it speaks for every body), then each `--body`, then the section.
+pub fn apply(s: &mut Session, bodies: &[&str], tools: &[&str], section: Option<&str>) -> Result<(), String> {
+    // Everything is read before anything is drawn, so a misspelt option is an error rather than
+    // half a picture.
+    let looks: Vec<BodyLook> = bodies.iter().map(|spec| parse_body(spec)).collect::<Result<_, _>>()?;
+    let section = section.map(parse_section).transpose()?;
+    if !tools.is_empty() {
+        let names = body_names(s);
+        for t in tools {
+            if !names.iter().any(|b| b == t) {
+                return Err(format!("--tool: no body `{t}` in the design (it has {})", body_list(s)));
+            }
+        }
+        // Everything but the tool see-through, in the colour it already has, so the tool reads
+        // against the material it meets. Bodies that share a colour are assigned together: a
+        // design of many bodies then costs a command or two rather than one for each.
+        let mut around: std::collections::BTreeMap<String, Vec<String>> = std::collections::BTreeMap::new();
+        for name in names.iter().filter(|n| !tools.contains(&n.as_str())) {
+            around.entry(current_look(s, name)?.0).or_default().push(name.clone());
+        }
+        for (hex, sharing_it) in around {
+            let params = json!({"bodies": sharing_it, "color": hex, "opacity": TARGET_OPACITY});
+            s.execute("appearance.assign", &params).map_err(|e| format!("--tool: {e}"))?;
+        }
+        // Then the tool itself, solid in the tool colour.
+        let params = json!({"bodies": tools, "color": TOOL_COLOR, "opacity": 1.0});
+        s.execute("appearance.assign", &params).map_err(|e| format!("--tool: {e}"))?;
+    }
+    for look in &looks {
+        assign(s, look)?;
+    }
+    if let Some(params) = section {
+        s.execute("inspect.section", &params).map_err(|e| format!("--section: {e}"))?;
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// `--body` names a body and says how it is drawn. Either key alone is enough.
+    #[test]
+    fn a_body_spec_is_a_name_and_the_keys_appearance_assign_takes() {
+        let look = |s: &str| parse_body(s).unwrap();
+        assert_eq!(look("Target:opacity=0.3"), BodyLook { name: "Target".into(), opacity: Some(0.3), color: None });
+        assert_eq!(look("Tool:color=#CC3333"), BodyLook { name: "Tool".into(), opacity: None, color: Some("#cc3333".into()) });
+        assert_eq!(look("Tool: opacity = 1 , color = #00ff00 "), BodyLook { name: "Tool".into(), opacity: Some(1.0), color: Some("#00ff00".into()) });
+        // A body name with a space in it, as the browser shows them.
+        assert_eq!(look("Bracket arm:opacity=0").name, "Bracket arm");
+        assert_eq!(look("A:opacity=0").opacity, Some(0.0));
+    }
+
+    /// Every way of getting `--body` wrong is an error that says what it takes, never a panic
+    /// and never a silently ignored option.
+    #[test]
+    fn a_bad_body_spec_says_what_it_takes() {
+        for (spec, expect) in [
+            ("Target", "NAME:key=value"),
+            (":opacity=0.3", "names no body"),
+            ("Target:", "asks for nothing"),
+            ("Target:opacity", "key=value"),
+            ("Target:opacity=high", "0 to 1"),
+            ("Target:opacity=1.5", "0 to 1"),
+            ("Target:opacity=-0.2", "0 to 1"),
+            ("Target:opacity=NaN", "0 to 1"),
+            ("Target:opacity=inf", "0 to 1"),
+            ("Target:color=red", "#rrggbb"),
+            ("Target:color=#ccc", "#rrggbb"),
+            ("Target:color=#gggggg", "#rrggbb"),
+            ("Target:alpha=0.3", "unknown key `alpha`"),
+        ] {
+            let e = parse_body(spec).err().unwrap_or_else(|| panic!("{spec} was accepted"));
+            assert!(e.contains(expect), "{spec}: {e}");
+        }
+    }
+
+    /// A `--section` spec is the plane `inspect.section` cuts with: an axis and a world
+    /// coordinate, a named plane, `flip` for the other side, or the command's own JSON.
+    #[test]
+    fn a_section_spec_is_the_plane_inspect_section_takes() {
+        let p = |s: &str| parse_section(s).unwrap();
+        // The plane normal to each axis, cutting at that coordinate.
+        assert_eq!(p("z=27"), json!({"plane": "XY", "at": 27.0}));
+        assert_eq!(p("y=-5.5"), json!({"plane": "XZ", "at": -5.5}));
+        assert_eq!(p("X=0"), json!({"plane": "YZ", "at": 0.0}));
+        assert_eq!(p("z=27,flip"), json!({"plane": "XY", "at": 27.0, "flip": true}));
+        // A named plane through the origin, and the command's own parameters.
+        assert_eq!(p("XY"), json!({"plane": "XY"}));
+        assert_eq!(p("yz,flip"), json!({"plane": "YZ", "flip": true}));
+        assert_eq!(p("{\"plane\": \"XY\", \"offset\": 4}"), json!({"plane": "XY", "offset": 4}));
+    }
+
+    #[test]
+    fn a_bad_section_spec_says_what_it_takes() {
+        for (spec, expect) in [
+            ("27", "z=27"),
+            ("w=4", "unknown axis `w`"),
+            ("z=high", "is not a number"),
+            ("z=inf", "not a finite coordinate"),
+            ("z=27,upside-down", "unknown `upside-down`"),
+            ("{\"plane\":", "not JSON"),
+        ] {
+            let e = parse_section(spec).err().unwrap_or_else(|| panic!("{spec} was accepted"));
+            assert!(e.contains(expect), "{spec}: {e}");
+        }
+    }
+
+    /// The tool colour is the one the options document, in the form `appearance.assign` takes.
+    #[test]
+    fn the_tool_colour_is_a_hex_colour_the_command_takes() {
+        assert_eq!(parse_body(&format!("Tool:color={TOOL_COLOR}")).unwrap().color, Some(TOOL_COLOR.to_owned()));
+        assert!((0.0..1.0).contains(&TARGET_OPACITY), "a target must be see-through: {TARGET_OPACITY}");
+        assert_eq!(default_body_hex(), "#b0bac6");
+    }
+}

apps/solidcraft-cli/src/recipe.rs

@@ -92,7 +92,7 @@ fn extent(f: &Value, p: &mut Value) {
         "symmetric" => {
             let full = e.get("is_full_length").and_then(Value::as_bool).unwrap_or(false);
             p["direction"] = json!("symmetric");
-            p["distance"] = if full { json!(format!("({}) / 2", expr_text(&dist))) } else { dist };
+            p["distance"] = if full { dist } else { json!(format!("({}) * 2", expr_text(&dist))) };
         }
         "two_sides" => {
             p["distance"] = e.get("side1").cloned().unwrap_or(Value::Null);
@@ -296,6 +296,17 @@ pub fn to_script(recipe: &Value) -> Result<Value, String> {
             Some("sketch") => sketch_cmds(f, &mut out)?,
             Some("extrude") => {
                 let mut p = json!({"sketch": profile_sketch(f), "profiles": profiles_of(f), "operation": op(f), "name": name, "body_names": bodies});
+                // Thin: {sketch, curves, thickness, side?, thickness2?} instead of profiles.
+                if let (Some(thin), Some(params)) = (f.get("thin"), p.as_object_mut()) {
+                    params.remove("profiles");
+                    params.insert("thin".into(), json!(true));
+                    params.insert("sketch".into(), thin.get("sketch").cloned().unwrap_or(Value::Null));
+                    for key in ["curves", "thickness", "side", "thickness2"] {
+                        if let Some(v) = thin.get(key) {
+                            params.insert(key.into(), v.clone());
+                        }
+                    }
+                }
                 extent(f, &mut p);
                 out.push(json!({"command": "solid.extrude", "params": p}));
             }
@@ -412,6 +423,24 @@ pub fn to_script(recipe: &Value) -> Result<Value, String> {
                     "sketch": profile_sketch(f), "profiles": profiles_of(f), "path_sketch": path.get("sketch"), "path": path.get("curves"),
                     "operation": op(f), "name": name, "body_names": bodies}}));
             }
+            // A boundary surface: a loop of one sketch's curves (`sketch`, `curves`), or a network
+            // (`u`, `v`), as `surface.boundary` takes them.
+            Some("boundary_surface") => {
+                let mut p = json!({"name": name});
+                for k in ["sketch", "curves", "continuity", "u", "v", "operation"] {
+                    if let Some(v) = f.get(k) {
+                        p[k] = v.clone();
+                    }
+                }
+                if let Some(b) = bodies.as_array().and_then(|a| a.first()) {
+                    p["body_name"] = b.clone();
+                }
+                out.push(json!({"command": "surface.boundary", "params": p}));
+            }
+            Some("thicken") => out.push(json!({"command": "surface.thicken", "params": {
+                "bodies": f.get("bodies"), "thickness": f.get("thickness"), "symmetric": f.get("symmetric").cloned().unwrap_or(json!(false)),
+                "operation": op(f), "name": name}})),
+            Some("remove") => out.push(json!({"command": "solid.remove", "params": {"bodies": f.get("bodies"), "name": name}})),
             Some("shell") => {
                 let faces: Vec<Value> = f.get("faces_removed").and_then(Value::as_array).into_iter().flatten().filter_map(|x| x.get("point").cloned()).collect();
                 out.push(json!({"command": "solid.shell", "params": {"faces": faces, "thickness": f.get("inside_thickness"), "name": name}}));
@@ -514,7 +543,23 @@ pub fn to_script(recipe: &Value) -> Result<Value, String> {
                 out.push(json!({"command": "solid.mirror", "params": p}));
             }
             Some("fillet") => {
-                out.push(json!({"command": "solid.fillet", "params": {"edges": edge_points(f), "radius": f.get("radius"), "name": name}}))
+                let mut p = json!({"edges": edge_points(f), "radius": f.get("radius"), "name": name});
+                // Constant radius (the default), chord length, or a radius varying along each edge
+                // (`radius` at the end nearest `start`, `radius2` at the other, `mid` between,
+                // `smooth`), or a B-spline along each edge (`radius` its first control radius,
+                // `radii` the rest, `knots`); `fit` for a radius too large for the geometry.
+                match f.get("type").and_then(Value::as_str) {
+                    Some("chord_length") => p["type"] = json!("chord"),
+                    Some("variable_radius") => p["type"] = json!("variable"),
+                    Some("spline_radius") => p["type"] = json!("spline"),
+                    _ => {}
+                }
+                for key in ["radius2", "start", "mid", "smooth", "fit", "radii", "knots"] {
+                    if let Some(v) = f.get(key) {
+                        p[key] = v.clone();
+                    }
+                }
+                out.push(json!({"command": "solid.fillet", "params": p}))
             }
             Some("chamfer") => {
                 out.push(json!({"command": "solid.chamfer", "params": {"edges": edge_points(f), "distance": f.get("distance"), "name": name}}))

apps/solidcraft-cli/src/render.rs

@@ -0,0 +1,79 @@
+//! Complete headless image-job workflow through the same engine commands as the UI/MCP.
+use serde_json::json;
+use solidcraft_engine::{
+    doc::render_settings::RenderSetup,
+    render::job::{CpuHost, JobId, Phase},
+};
+
+pub fn run(args: &[String]) -> Result<(), String> {
+    let input = args.first().filter(|p| !p.starts_with('-')).ok_or("render requires an input design or script")?;
+    let mut out = None;
+    let mut setup = None;
+    let mut width = None;
+    let mut height = None;
+    let mut transparent = false;
+    let mut overwrite = false;
+    let mut timeout = 120u64;
+    let mut i = 1;
+    while let Some(arg) = args.get(i) {
+        match arg.as_str() {
+            "--transparent" => transparent = true,
+            "--overwrite" => overwrite = true,
+            "--out" | "--setup" | "--width" | "--height" | "--timeout" => {
+                i += 1;
+                let value = args.get(i).ok_or_else(|| format!("missing value for {arg}"))?;
+                match arg.as_str() {
+                    "--out" => out = Some(value.clone()),
+                    "--setup" => setup = Some(value.clone()),
+                    "--width" => width = Some(value.parse::<u32>().map_err(|_| "invalid width")?),
+                    "--height" => height = Some(value.parse::<u32>().map_err(|_| "invalid height")?),
+                    _ => timeout = value.parse::<u64>().map_err(|_| "invalid timeout")?,
+                }
+            }
+            _ => return Err(format!("unknown render option: {arg}")),
+        }
+        i += 1;
+    }
+    if !(1..=3600).contains(&timeout) {
+        return Err("render timeout must be 1..3600 seconds".into());
+    }
+    let out = out.ok_or("render requires --out FILE.png")?;
+    let mut session = crate::load(input)?;
+    session.set_render_job_host(Some(CpuHost::for_platform().map_err(|e| e.to_string())?)).map_err(|e| e.to_string())?;
+    session.execute("render.scene", &json!({})).map_err(|e| e.to_string())?;
+    let mut settings = if let Some(name) = setup {
+        session.doc.render.setups.get(&name).cloned().ok_or("no saved render setup with that name")?
+    } else {
+        let mut settings = RenderSetup::default();
+        if let Some(camera) = session.camera {
+            settings.camera = camera;
+        } else {
+            settings.camera.fit(&solidcraft_engine::product_scene::extract(&session).map_err(|e| e.to_string())?.bounds);
+        }
+        settings
+    };
+    if let Some(width) = width {
+        settings.width = width;
+    }
+    if let Some(height) = height {
+        settings.height = height;
+    }
+    let params = json!({"settings":settings,"transparent_background":transparent});
+    let preflight = session.execute("render.preflight", &params).map_err(|e| e.to_string())?;
+    let started = session.execute("render.start", &params).map_err(|e| e.to_string())?;
+    let id: JobId = serde_json::from_value(started["job"].clone()).map_err(|e| e.to_string())?;
+    let handle = session.render_job_handle(id).map_err(|e| e.to_string())?;
+    let status = match handle.wait_timeout(std::time::Duration::from_secs(timeout)) {
+        Ok(status) => status,
+        Err(e) => {
+            let _ = session.execute("render.cancel", &json!({"job":id}));
+            return Err(e.to_string());
+        }
+    };
+    if status.progress.phase != Phase::Completed {
+        return Err(status.error.map_or_else(|| "render cancelled".into(), |e| e.to_string()));
+    }
+    let exported = session.execute("render.export", &json!({"job":id,"path":out,"overwrite":overwrite})).map_err(|e| e.to_string())?;
+    println!("{}", crate::pretty(&json!({"preflight":preflight,"export":exported})));
+    Ok(())
+}

apps/solidcraft-cli/tests/bracket_example.rs

@@ -0,0 +1,62 @@
+//! The bracket example must cut two through holes, rather than successfully cutting empty
+//! space beside the body. Check the shipped script and rebuild its saved design from scratch.
+
+use std::f64::consts::PI;
+
+use serde_json::Value;
+use solidcraft_engine::geom::Vec3;
+use solidcraft_engine::{Session, io, kernel};
+
+fn assert_two_through_holes(session: &Session, stage: &str) {
+    let errors: Vec<_> = session.model.results.iter().filter_map(|r| r.error.as_ref().map(|e| (&r.name, e))).collect();
+    assert!(errors.is_empty(), "{stage}: every example feature evaluates: {errors:?}");
+
+    let cut = session.doc.features.last().expect("the example ends with the hole cut");
+    let before = session.model.state_before(cut.id);
+    let after = session.model.state();
+    assert_eq!(before.bodies.len(), 1, "{stage}: one bracket before cutting the holes");
+    assert_eq!(after.bodies.len(), 1, "{stage}: the holes leave one bracket");
+    let uncut = &before.body("Bracket").expect("the uncut bracket").body;
+    let bracket = &after.body("Bracket").expect("the finished bracket").body;
+
+    // Measure the actual state before the final cut so the existing edge fillet cancels out.
+    // Both holes have diameter 8 mm and pass through the 6 mm base. Kernel measurements are
+    // tessellated, so the relative tolerance applies to the removed material, not the body.
+    let removed = kernel::measure(uncut).unwrap().volume - kernel::measure(bracket).unwrap().volume;
+    let expected = 2.0 * PI * 4.0_f64.powi(2) * 6.0;
+    assert!((removed - expected).abs() < expected * 1e-3, "{stage}: the two holes remove {removed} mm³, expected {expected} mm³");
+
+    let before_mesh = uncut.tessellate(0.01).unwrap();
+    let after_mesh = bracket.tessellate(0.01).unwrap();
+    let down = Vec3::new(0.0, 0.0, -1.0);
+    for y in [-15.0, -45.0] {
+        let center = Vec3::new(25.0, y, 1.0);
+        assert_eq!(before_mesh.ray_crossings(center, down), 2, "{stage}: hole at y={y} starts over the solid base");
+        // Rays through each opening must miss the entire bracket, including its top and
+        // bottom caps. Points away from the centre guard against a narrow slit or shifted cut.
+        for (dx, dy) in [(0.0, 0.0), (3.0, 0.0), (-3.0, 0.0), (0.0, 3.0), (0.0, -3.0)] {
+            let ray = center + Vec3::new(dx, dy, 0.0);
+            assert_eq!(after_mesh.ray_crossings(ray, down), 0, "{stage}: the hole at y={y} is open through both caps at ({dx}, {dy})");
+        }
+        // Material just outside each radius remains, so neither opening is an edge notch.
+        for (dx, dy) in [(5.0, 0.0), (-5.0, 0.0), (0.0, 5.0), (0.0, -5.0)] {
+            let ray = center + Vec3::new(dx, dy, 0.0);
+            assert_eq!(after_mesh.ray_crossings(ray, down), 2, "{stage}: material remains around the hole at y={y}, offset ({dx}, {dy})");
+        }
+    }
+}
+
+#[test]
+fn bracket_example_cuts_two_through_holes_and_reopens() {
+    let script: Value = serde_json::from_str(include_str!("../../../examples/bracket.json")).unwrap();
+    let mut session = Session::default();
+    session.run_script(&script).unwrap();
+    assert_two_through_holes(&session, "script");
+
+    // No geometry cache is supplied: reopening the container re-evaluates the saved timeline.
+    let saved = io::write_design_container(&session.doc).unwrap();
+    let document = io::read_design(&saved).unwrap();
+    assert_eq!(document.features, session.doc.features, "saving preserves the example's feature parameters");
+    let reopened = Session::new(document);
+    assert_two_through_holes(&reopened, "reopened");
+}

apps/solidcraft-cli/tests/corpus/README.md

@@ -16,7 +16,13 @@ hostile variants of it never panic.
 | `modern-path-pattern` | bd98035 | pattern on path (oracle 53) |
 | `modern-plastic` | bd98035 | shell, lip, boss, rest, snap fit, plastic rule |
 | `naming-split-pieces` | 9a979cf | format 13 names: a slot splits the top; fillet, chamfer and offset face name its pieces by number (`F2:top#2`) |
+| `move-bodies` | 00baf1d | `solid.move` before it could copy: two bodies, one translated in place, one translated and turned 90 deg about Z (no `copy` key anywhere in the file) |
 | `split-body-pieces` | v0.3.2 (07e263d) | a slot along X cuts a block into two bodies; a fillet, a chamfer and an appearance refer to the pieces by body name (`Body1`, `Body1 (1)`) |
+| `issue-489-stacked-join` | v0.6.0 (809ecf7), desktop | a 70 × 84 extrude, then a 70 × 62 strip joined on its top face, sketched partly over the face's projected edges (issue #489; expected values from main at 2880525) |
+| `issue-616-lid-ribs` | v0.7.0 (a9879fa), CLI | a rounded lid with a skirt ring, a window and a slot cut through, then four ribs joined on the plate over the skirt, flush with the window's sides; v0.7.0 displaced the ribs and left a slit through the skirt and plate (issue #616; script `examples/regressions/lid_ribs_flush_with_window.json`, expected values from the fix) |
 
-The scripts that made them are in `scripts/`. Never regenerate a file with a newer build: the
-point is that it was written by the old one. Add new files for new eras instead.
+The scripts that made them are in `scripts/` (`issue-489-stacked-join` was drawn in the desktop
+app and has none; `issue-616-lid-ribs` is made by its regression script). Every flat face of every final body must also take an attached sketch and an
+offset plane; the faces that can't yet are listed with their issues in `design_corpus.rs`.
+
+Never regenerate a file with a newer build: the point is that it was written by the old one. Add new files for new eras instead.

apps/solidcraft-cli/tests/corpus/issue-489-stacked-join.expected.json

@@ -0,0 +1,157 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 25751.999999999945,
+      "bbox": {
+        "max": [
+          35.0,
+          42.0,
+          48.00000000000001
+        ],
+        "min": [
+          -35.0,
+          -42.000000000000014,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        5.524909928104648e-14,
+        -1.0945382096961234e-12,
+        22.366336633663238
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 24,
+      "face_types": {
+        "plane": 10
+      },
+      "faces": 10,
+      "kernel": {
+        "edges": 24,
+        "faces": 10,
+        "shells": 1,
+        "vertices": 16
+      },
+      "mass_g": 328.33079999999734,
+      "material": "Default",
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+}

apps/solidcraft-cli/tests/corpus/issue-489-stacked-join.solidcraft

@@ -0,0 +1,539 @@
+{
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+  "name": "Untitled",
+  "next_id": 6,
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+      "model": true,
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+      "unit": "mm"
+    }
+  ],
+  "units": "mm"
+}

apps/solidcraft-cli/tests/corpus/issue-616-lid-ribs.expected.json

@@ -0,0 +1,227 @@
+{
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+}

apps/solidcraft-cli/tests/corpus/issue-616-lid-ribs.solidcraft

@@ -0,0 +1,507 @@
+{
+  "features": [
+    {
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+        "Lid"
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+        "F1:-x|F1:-y",
+        "F1:+x|F1:-y",
+        "F1:+y|F1:-x",
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+          "dir": [
+            0.0,
+            0.0,
+            1.0
+          ],
+          "max": [
+            176.8,
+            89.3,
+            2.4
+          ],
+          "min": [
+            100.0,
+            0.0,
+            0.0
+          ]
+        },
+        {
+          "dir": [
+            0.0,
+            0.0,
+            1.0
+          ],
+          "max": [
+            176.8,
+            89.3,
+            2.4
+          ],
+          "min": [
+            100.0,
+            0.0,
+            0.0
+          ]
+        },
+        {
+          "dir": [
+            0.0,
+            0.0,
+            1.0
+          ],
+          "max": [
+            176.8,
+            89.3,
+            2.4
+          ],
+          "min": [
+            100.0,
+            0.0,
+            0.0
+          ]
+        }
+      ],
+      "edges": [
+        [
+          100.0,
+          0.0,
+          1.2
+        ],
+        [
+          176.8,
+          0.0,
+          1.2
+        ],
+        [
+          100.0,
+          89.3,
+          1.2
+        ],
+        [
+          176.8,
+          89.3,
+          1.2
+        ]
+      ],
+      "id": 2,
+      "name": "Fillet1",
+      "param_names": [
+        "d4"
+      ],
+      "radius": "3",
+      "suppressed": false,
+      "type": "fillet"
+    },
+    {
+      "id": 3,
+      "name": "Skirt",
+      "param_names": [
+        "d5"
+      ],
+      "plane": {
+        "base": {
+          "name": "XY",
+          "type": "origin"
+        },
+        "distance": "2.4",
+        "type": "offset"
+      },
+      "sketch": {
+        "constraints": [
+          {
+            "id": "k1",
+            "l": 0,
+            "type": "horizontal"
+          },
+          {
+            "id": "k2",
+            "l": 2,
+            "type": "horizontal"
+          },
+          {
+            "id": "k3",
+            "l": 1,
+            "type": "vertical"
+          },
+          {
+            "id": "k4",
+            "l": 3,
+            "type": "vertical"
+          },
+          {
+            "id": "k5",
+            "l": 4,
+            "type": "horizontal"
+          },
+          {
+            "id": "k6",
+            "l": 6,
+            "type": "horizontal"
+          },
+          {
+            "id": "k7",
+            "l": 5,
+            "type": "vertical"
+          },
+          {
+            "id": "k8",
+            "l": 7,
+            "type": "vertical"
+          }
+        ],
+        "counters": {
+          "k": 8,
+          "l": 8,
+          "p": 8
+        },
+        "curves": [
+          {
+            "a": 1,
+            "b": 2,
+            "construction": false,
+            "id": "l1",
+            "type": "line"
+          },
+          {
+            "a": 2,
+            "b": 3,
+            "construction": false,
+            "id": "l2",
+            "type": "line"
+          },
+          {
+            "a": 3,
+            "b": 4,
+            "construction": false,
+            "id": "l3",
+            "type": "line"
+          },
+          {
+            "a": 4,
+            "b": 1,
+            "construction": false,
+            "id": "l4",
+            "type": "line"
+          },
+          {
+            "a": 5,
+            "b": 6,
+            "construction": false,
+            "id": "l5",
+            "type": "line"
+          },
+          {
+            "a": 6,
+            "b": 7,
+            "construction": false,
+            "id": "l6",
+            "type": "line"
+          },
+          {
+            "a": 7,
+            "b": 8,
+            "construction": false,
+            "id": "l7",
+            "type": "line"
+          },
+          {
+            "a": 8,
+            "b": 5,
+            "construction": false,
+            "id": "l8",
+            "type": "line"
+          }
+        ],
+        "points": [
+          {
+            "fixed": true,
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p1",
+            "pos": [
+              102.65,
+              2.65
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p2",
+            "pos": [
+              174.15,
+              2.65
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p3",
+            "pos": [
+              174.15,
+              86.65
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p4",
+            "pos": [
+              102.65,
+              86.65
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p5",
+            "pos": [
+              104.15,
+              4.15
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p6",
+            "pos": [
+              172.65,
+              4.15
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p7",
+            "pos": [
+              172.65,
+              85.15
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p8",
+            "pos": [
+              104.15,
+              85.15
+            ]
+          }
+        ]
+      },
+      "suppressed": false,
+      "type": "sketch"
+    },
+    {
+      "extent": {
+        "direction": "positive",
+        "distance": "3"
+      },
+      "id": 4,
+      "name": "Extrude1",
+      "operation": "join",
+      "param_names": [
+        "d6"
+      ],
+      "profiles": {
+        "loops": [
+          [
+            "l1",
+            "l2",
+            "l3",
+            "l4"
+          ]
+        ],
+        "type": "curves"
+      },
+      "sketch": 3,
+      "suppressed": false,
+      "targets": [
+        "Lid"
+      ],
+      "type": "extrude"
+    },
+    {
+      "corner": [
+        104.4,
+        5.4,
+        -1.0
+      ],
+      "height": "8",
+      "id": 5,
+      "length": "68",
+      "name": "Box2",
+      "operation": "cut",
+      "param_names": [
+        "d7",
+        "d8",
+        "d9"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "61"
+    },
+    {
+      "corner": [
+        116.4,
+        72.0,
+        -1.0
+      ],
+      "height": "8",
+      "id": 6,
+      "length": "44",
+      "name": "Box3",
+      "operation": "cut",
+      "param_names": [
+        "d10",
+        "d11",
+        "d12"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "10"
+    },
+    {
+      "corner": [
+        127.4,
+        84.0,
+        2.4
+      ],
+      "height": "4",
+      "id": 7,
+      "length": "22",
+      "name": "Box4",
+      "operation": "cut",
+      "param_names": [
+        "d13",
+        "d14",
+        "d15"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "6"
+    },
+    {
+      "corner": [
+        102.8,
+        14.0,
+        2.4
+      ],
+      "height": "11.7",
+      "id": 8,
+      "length": "1.6",
+      "name": "Rib1",
+      "operation": "join",
+      "param_names": [
+        "d16",
+        "d17",
+        "d18"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "6"
+    },
+    {
+      "corner": [
+        102.8,
+        48.0,
+        2.4
+      ],
+      "height": "11.7",
+      "id": 9,
+      "length": "1.6",
+      "name": "Rib2",
+      "operation": "join",
+      "param_names": [
+        "d19",
+        "d20",
+        "d21"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "6"
+    },
+    {
+      "corner": [
+        172.4,
+        14.0,
+        2.4
+      ],
+      "height": "11.7",
+      "id": 10,
+      "length": "1.6",
+      "name": "Rib3",
+      "operation": "join",
+      "param_names": [
+        "d22",
+        "d23",
+        "d24"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "6"
+    },
+    {
+      "corner": [
+        172.4,
+        48.0,
+        2.4
+      ],
+      "height": "11.7",
+      "id": 11,
+      "length": "1.6",
+      "name": "Rib4",
+      "operation": "join",
+      "param_names": [
+        "d25",
+        "d26",
+        "d27"
+      ],
+      "suppressed": false,
+      "type": "box",
+      "width": "6"
+    }
+  ],
+  "format": "solidcraft/15",
+  "name": "issue-616-lid-ribs",
+  "next_id": 12,
+  "params": [],
+  "units": "mm"
+}

apps/solidcraft-cli/tests/corpus/move-bodies.expected.json

@@ -0,0 +1,194 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 2400.0,
+      "bbox": {
+        "max": [
+          50.0,
+          20.0,
+          20.0
+        ],
+        "min": [
+          30.0,
+          0.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        40.0,
+        10.0,
+        10.0
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 12,
+      "face_types": {
+        "plane": 6
+      },
+      "faces": 6,
+      "kernel": {
+        "edges": 12,
+        "faces": 6,
+        "shells": 1,
+        "vertices": 8
+      },
+      "mass_g": 10.32,
+      "material": "Default",
+      "name": "Block",
+      "vertices": 8,
+      "volume_mm3": 8000.0
+    },
+    {
+      "area_mm2": 600.0,
+      "bbox": {
+        "max": [
+          3.552713678800501e-15,
+          90.0,
+          10.0
+        ],
+        "min": [
+          -9.999999999999998,
+          80.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        -4.999999999999999,
+        85.0,
+        5.000000000000001
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 12,
+      "face_types": {
+        "plane": 6
+      },
+      "faces": 6,
+      "kernel": {
+        "edges": 12,
+        "faces": 6,
+        "shells": 1,
+        "vertices": 8
+      },
+      "mass_g": 1.29,
+      "material": "Default",
+      "name": "Peg",
+      "vertices": 8,
+      "volume_mm3": 1000.0
+    }
+  ],
+  "body_count": 2,
+  "params": [],
+  "sketches": [
+    {
+      "curves": 4,
+      "dof": 2,
+      "id": 1,
+      "name": "Base",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    },
+    {
+      "curves": 4,
+      "dof": 4,
+      "id": 3,
+      "name": "Peg",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    }
+  ],
+  "timeline": [
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 1,
+      "ms": 0.204585,
+      "name": "Base",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 2,
+      "ms": 2.318662,
+      "name": "Extrude1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 3,
+      "ms": 0.109196,
+      "name": "Peg",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 4,
+      "ms": 0.338859,
+      "name": "Extrude2",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 5,
+      "ms": 0.312259,
+      "name": "Move1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "MoveFeature",
+      "warning": null
+    },
+    {
+      "boolean_diagnostics": {
+        "events": [],
+        "truncated": false
+      },
+      "error": null,
+      "id": 6,
+      "ms": 0.23144699999999999,
+      "name": "Move2",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "MoveFeature",
+      "warning": null
+    }
+  ],
+  "total": {
+    "area_mm2": 3000.0,
+    "edges": 24,
+    "faces": 12,
+    "mass_g": 11.61,
+    "vertices": 16,
+    "volume_mm3": 9000.0
+  }
+}

apps/solidcraft-cli/tests/corpus/move-bodies.solidcraft

@@ -0,0 +1 @@
+{"features":[{"id":1,"name":"Base","plane":{"name":"XY","type":"origin"},"sketch":{"constraints":[{"id":"k1","l":0,"type":"horizontal"},{"id":"k2","l":2,"type":"horizontal"},{"id":"k3","l":1,"type":"vertical"},{"id":"k4","l":3,"type":"vertical"},{"id":"k5","p":0,"q":1,"type":"coincident"}],"counters":{"k":5,"l":4,"p":4},"curves":[{"a":1,"b":2,"construction":false,"id":"l1","type":"line"},{"a":2,"b":3,"construction":false,"id":"l2","type":"line"},{"a":3,"b":4,"construction":false,"id":"l3","type":"line"},{"a":4,"b":1,"construction":false,"id":"l4","type":"line"}],"points":[{"fixed":true,"id":"origin","pos":[0.0,0.0]},{"fixed":false,"id":"p1","pos":[0.0,0.0]},{"fixed":false,"id":"p2","pos":[20.0,0.0]},{"fixed":false,"id":"p3","pos":[20.0,20.0]},{"fixed":false,"id":"p4","pos":[0.0,20.0]}]},"suppressed":false,"type":"sketch"},{"body_names":["Block"],"extent":{"direction":"positive","distance":"20"},"id":2,"name":"Extrude1","operation":"new_body","param_names":["d1"],"profiles":{"type":"all"},"sketch":1,"suppressed":false,"type":"extrude"},{"id":3,"name":"Peg","plane":{"name":"XY","type":"origin"},"sketch":{"constraints":[{"id":"k1","l":0,"type":"horizontal"},{"id":"k2","l":2,"type":"horizontal"},{"id":"k3","l":1,"type":"vertical"},{"id":"k4","l":3,"type":"vertical"}],"counters":{"k":4,"l":4,"p":4},"curves":[{"a":1,"b":2,"construction":false,"id":"l1","type":"line"},{"a":2,"b":3,"construction":false,"id":"l2","type":"line"},{"a":3,"b":4,"construction":false,"id":"l3","type":"line"},{"a":4,"b":1,"construction":false,"id":"l4","type":"line"}],"points":[{"fixed":true,"id":"origin","pos":[0.0,0.0]},{"fixed":false,"id":"p1","pos":[40.0,0.0]},{"fixed":false,"id":"p2","pos":[50.0,0.0]},{"fixed":false,"id":"p3","pos":[50.0,10.0]},{"fixed":false,"id":"p4","pos":[40.0,10.0]}]},"suppressed":false,"type":"sketch"},{"body_names":["Peg"],"extent":{"direction":"positive","distance":"10"},"id":4,"name":"Extrude2","operation":"new_body","param_names":["d2"],"profiles":{"type":"all"},"sketch":3,"suppressed":false,"type":"extrude"},{"bodies":["Block"],"id":5,"name":"Move1","param_names":["d3","d4","d5"],"suppressed":false,"translate":["30","0","0"],"type":"move"},{"angle":"90 deg","bodies":["Peg"],"id":6,"name":"Move2","param_names":["d6","d7","d8","d9"],"rotate_axis":[0.0,0.0,1.0],"suppressed":false,"translate":["0","40","0"],"type":"move"}],"format":"solidcraft/15","name":"old-move-bodies","next_id":7,"params":[],"units":"mm"}

apps/solidcraft-cli/tests/corpus/scripts/move-bodies.json

@@ -0,0 +1,14 @@
+{
+ "commands": [
+  {"command": "sketch.create", "params": {"plane": "XY", "name": "Base"}},
+  {"command": "sketch.rectangle.two_point", "params": {"p0": [0, 0], "p1": [20, 20]}},
+  {"command": "sketch.finish", "params": {}},
+  {"command": "solid.extrude", "params": {"distance": 20, "body_name": "Block"}},
+  {"command": "sketch.create", "params": {"plane": "XY", "name": "Peg"}},
+  {"command": "sketch.rectangle.two_point", "params": {"p0": [40, 0], "p1": [50, 10]}},
+  {"command": "sketch.finish", "params": {}},
+  {"command": "solid.extrude", "params": {"distance": 10, "operation": "new", "body_name": "Peg"}},
+  {"command": "solid.move", "params": {"bodies": ["Block"], "translate": [30, 0, 0]}},
+  {"command": "solid.move", "params": {"bodies": ["Peg"], "translate": [0, 40, 0], "axis": [0, 0, 1], "angle": "90 deg"}}
+ ]
+}

apps/solidcraft-cli/tests/design_corpus.rs

@@ -27,7 +27,7 @@ const KNOWN: [(&str, &str, &str); 2] = [
     (
         "m0-revolve-primitives",
         "Body1 bbox",
-        "partial revolves turn toward the sketch normal since ac43365 (as Fusion's do); M0 turned them the other way",
+        "partial revolves turn toward the sketch normal since ac43365 (as most parametric CAD tools do); M0 turned them the other way",
     ),
     ("components-arm", "body_count", "Measure counted only the root component's bodies then; it measures every placed body now"),
 ];
@@ -131,6 +131,137 @@ fn body_names_saved_before_exact_history_keep_their_pieces() {
     assert!(s.doc.appearances.bodies.contains_key("Body1 (1)"));
 }
 
+/// Flat faces that can't take an attached sketch yet, by cause: (design, body, the faces'
+/// planes as outward normal and distance from the origin, or every flat face of the body,
+/// issue). Face indices are not used: they can change between builds. Each issue has an
+/// ignored test below that checks its faces; a listed plane whose face attaches fails the main
+/// check until it is removed from here.
+type Planes = &'static [([f64; 3], f64)];
+const NO_ATTACHMENT_YET: [(&str, &str, Option<Planes>, u32); 1] = [("issue-616-lid-ribs", "Lid", None, 628)];
+
+/// The issue a face is listed under, and whether it is listed by its plane (not as every face).
+fn known_without_attachment(design: &str, body: &str, normal: [f64; 3], distance: f64) -> Option<(u32, bool)> {
+    let same = |(n, d): &([f64; 3], f64)| (0..3).all(|i| (n[i] - normal[i]).abs() < 1e-6) && (d - distance).abs() < 1e-4;
+    NO_ATTACHMENT_YET.iter().find_map(|(d, b, planes, issue)| {
+        if *d != design || *b != body {
+            return None;
+        }
+        match planes {
+            None => Some((*issue, false)),
+            Some(planes) => planes.iter().any(same).then_some((*issue, true)),
+        }
+    })
+}
+
+fn undo_to(s: &mut Session, features: usize) {
+    for _ in 0..4 {
+        if s.doc.features.len() <= features {
+            return;
+        }
+        s.execute("edit.undo", &json!({})).unwrap();
+    }
+    assert_eq!(s.doc.features.len(), features, "undo did not remove the added feature");
+}
+
+/// Try a sketch and an offset plane on every flat face of every final body of every corpus
+/// design, through the same face pick the desktop sends (body, face index, occurrence path, a
+/// point on it), without `fixed`. Undo leaves the design as it was for the next face. Returns
+/// (design, body, face, issue it is known under, what went wrong or None).
+fn flat_face_attachments() -> Vec<(String, String, usize, Option<(u32, bool)>, Option<String>)> {
+    use solidcraft_engine::doc::{FaceAttachmentStatus, apply_point};
+    let mut out = Vec::new();
+    for p in corpus() {
+        let name = p.file_stem().unwrap_or_default().to_string_lossy().to_string();
+        let mut s = open(&p);
+        let state = s.model.state();
+        let placed = s.placed_document();
+        let mut picks = Vec::new();
+        for (world, definition, component, path, frame) in placed.body_frames_with_source(&state) {
+            let Some(body) = state.bodies.iter().find(|b| b.definition_name() == definition && placed.model_body_component(b) == component) else {
+                continue;
+            };
+            let mesh = body.body.tessellate(0.01).unwrap();
+            for index in 0..body.body.face_count() {
+                if body.body.planar_face(index).is_none() {
+                    continue;
+                }
+                // The middle of the face's largest triangle: well inside the face.
+                let point = mesh
+                    .triangles
+                    .iter()
+                    .zip(&mesh.tri_face)
+                    .filter(|(_, f)| **f as usize == index)
+                    .filter_map(|(t, _)| mesh.tri(t))
+                    .max_by(|[a, b, c], [d, e, f]| (*b - *a).cross(*c - *a).len().total_cmp(&(*e - *d).cross(*f - *d).len()))
+                    .map(|[a, b, c]| (a + b + c) * (1.0 / 3.0));
+                let Some(point) = point else { continue };
+                let point = apply_point(&frame, point);
+                let normal =
+                    body.body.planar_face(index).map(|plane| solidcraft_engine::doc::apply_vector(&frame, plane.normal())).unwrap_or_default();
+                let key = ([normal.x, normal.y, normal.z], normal.dot(point));
+                picks.push((world.clone(), index, key, json!({"face": point, "body": world, "index": index, "path": path})));
+            }
+        }
+        let before = s.doc.features.len();
+        for (body, index, (normal, distance), plane) in picks {
+            let mut problem = None;
+            match s.execute("sketch.create", &json!({"plane": plane})) {
+                Ok(created) => {
+                    let id = created["sketch"].as_u64().unwrap_or(0);
+                    match s.placed_document().sketch_face_attachment(id, &s.model) {
+                        FaceAttachmentStatus::Healthy { .. } | FaceAttachmentStatus::Sheet { .. } => {}
+                        other => problem = Some(format!("sketch attachment {other:?}")),
+                    }
+                    s.execute("sketch.finish", &json!({})).unwrap();
+                    undo_to(&mut s, before);
+                }
+                Err(e) => problem = Some(format!("sketch.create: {e}")),
+            }
+            match s.execute("construct.plane.offset", &json!({"base": plane, "offset": 5})) {
+                Ok(_) => undo_to(&mut s, before),
+                Err(e) => problem = Some(problem.map_or(String::new(), |p| p + "; ") + &format!("construct.plane.offset: {e}")),
+            }
+            let known = known_without_attachment(&name, &body, normal, distance);
+            out.push((name.clone(), body, index, known, problem));
+        }
+        assert!(s.model.results.iter().all(|r| r.error.is_none()), "{name}: left with errors after undo");
+    }
+    out
+}
+
+/// Every flat face of every corpus design takes a durable attachment (issue #489: the top face
+/// of an extrude sketched over a face's projected boundary had "no exact planar source"),
+/// except the faces listed in [`NO_ATTACHMENT_YET`] under their open issues.
+#[test]
+fn every_flat_face_of_every_corpus_design_takes_an_attached_sketch() {
+    let all = flat_face_attachments();
+    assert!(all.len() > 50, "only {} faces checked", all.len());
+    let problems: Vec<String> = all
+        .iter()
+        .filter_map(|(design, body, face, known, problem)| match (known, problem) {
+            (None, Some(problem)) => Some(format!("{design}: {body} face {face}: {problem}")),
+            (Some((issue, true)), None) => Some(format!("{design}: {body} face {face} attaches now: remove it from NO_ATTACHMENT_YET (#{issue})")),
+            _ => None,
+        })
+        .collect();
+    assert!(problems.is_empty(), "{} of {} faces:\n{}", problems.len(), all.len(), problems.join("\n"));
+}
+
+fn known_faces_attach(issue: u32) {
+    let problems: Vec<String> = flat_face_attachments()
+        .into_iter()
+        .filter(|(.., known, problem)| known.is_some_and(|(known, _)| known == issue) && problem.is_some())
+        .map(|(design, body, face, _, problem)| format!("{design}: {body} face {face}: {}", problem.unwrap_or_default()))
+        .collect();
+    assert!(problems.is_empty(), "{}", problems.join("\n"));
+}
+
+#[test]
+#[ignore = "fails until #628 is fixed"]
+fn faces_of_a_lid_with_joined_ribs_take_an_attached_sketch() {
+    known_faces_attach(628);
+}
+
 /// A small deterministic generator (xorshift).
 struct Rng(u64);
 impl Rng {

apps/solidcraft-cli/tests/json_out.rs

@@ -0,0 +1,168 @@
+//! `--json-out FILE` writes the JSON `run` and `eval` would print to a file the CLI makes
+//! itself. A shell's `>` can re-encode stdout (Windows PowerShell writes UTF-16, or UTF-8 with a
+//! byte-order mark), which strict JSON readers refuse; the file is plain UTF-8.
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Output};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use serde_json::{Value, json};
+
+static NEXT: AtomicUsize = AtomicUsize::new(0);
+
+struct Scratch(PathBuf);
+
+impl Scratch {
+    fn new() -> Self {
+        let dir = std::env::temp_dir().join(format!("solidcraft-json-out-{}-{}", std::process::id(), NEXT.fetch_add(1, Ordering::Relaxed)));
+        std::fs::create_dir(&dir).unwrap();
+        Self(dir)
+    }
+
+    /// A box, and a parameter whose comment has a character outside ASCII.
+    fn script(&self) -> PathBuf {
+        let path = self.0.join("box.json");
+        let script = json!({"commands": [
+            {"command": "parameters.add", "params": {"name": "bore", "expression": "5 mm", "comment": "\u{d8} of the bore"}},
+            {"command": "solid.box", "params": {"length": 2, "width": 3, "height": 4}},
+        ]});
+        std::fs::write(&path, script.to_string()).unwrap();
+        path
+    }
+
+    /// A filleted box whose fillet a later parameter change makes impossible: every command
+    /// succeeds, the timeline ends with a failing feature.
+    fn broken_script(&self) -> PathBuf {
+        let path = self.0.join("broken.json");
+        let script = json!({"commands": [
+            {"command": "parameters.add", "params": {"name": "r", "expression": "2 mm"}},
+            {"command": "solid.box", "params": {"length": 20, "width": 20, "height": 10}},
+            {"command": "solid.fillet", "params": {"edges": [[10, 0, 10]], "radius": "r"}},
+            {"command": "parameters.change", "params": {"name": "r", "expression": "50 mm"}},
+        ]});
+        std::fs::write(&path, script.to_string()).unwrap();
+        path
+    }
+}
+
+impl Drop for Scratch {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+
+fn cli() -> Command {
+    Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+}
+
+fn stdout_of(output: Output) -> Vec<u8> {
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    output.stdout
+}
+
+/// Timings differ from one run to the next.
+fn without_timings(v: &mut Value) {
+    match v {
+        Value::Object(map) => {
+            map.remove("ms");
+            map.values_mut().for_each(without_timings);
+        }
+        Value::Array(items) => items.iter_mut().for_each(without_timings),
+        _ => {}
+    }
+}
+
+/// The file holds what stdout carried in the same command without `--json-out`: the same JSON,
+/// laid out the same way, in UTF-8 with no byte-order mark (UTF-8's or UTF-16's), so a strict
+/// reader accepts it.
+fn assert_plain_utf8_json(file: &Path, stdout: &[u8]) -> Value {
+    let bytes = std::fs::read(file).unwrap();
+    assert!(matches!(bytes.first(), Some(b'{' | b'[')), "the file starts with the JSON itself, not a mark");
+    assert_eq!(bytes.last(), Some(&b'\n'), "like stdout, the file ends with a newline");
+    let lines = |b: &[u8]| b.iter().filter(|c| **c == b'\n').count();
+    assert_eq!(lines(&bytes), lines(stdout), "laid out like stdout");
+    let mut value: Value = serde_json::from_str(std::str::from_utf8(&bytes).unwrap()).unwrap();
+    let mut printed: Value = serde_json::from_slice(stdout).unwrap();
+    without_timings(&mut value);
+    without_timings(&mut printed);
+    assert_eq!(value, printed, "the file is what stdout would have carried");
+    value
+}
+
+#[test]
+fn run_results_json_out_holds_what_stdout_would() {
+    let dir = Scratch::new();
+    let script = dir.script();
+    let file = dir.0.join("results.json");
+    let on_stdout = stdout_of(cli().arg("run").arg(&script).arg("--results").output().unwrap());
+    let output = cli().arg("run").arg(&script).arg("--results").arg("--json-out").arg(&file).output().unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    assert!(output.stdout.is_empty(), "the JSON goes to the file, not to stdout");
+    let results = assert_plain_utf8_json(&file, &on_stdout);
+    assert_eq!(results.as_array().map(Vec::len), Some(2));
+}
+
+#[test]
+fn run_json_out_without_results_holds_the_measurement_even_when_quiet() {
+    let dir = Scratch::new();
+    let script = dir.script();
+    let on_stdout = stdout_of(cli().arg("run").arg(&script).output().unwrap());
+    for (name, extra) in [("plain", &[][..]), ("quiet", &["--quiet"][..])] {
+        let file = dir.0.join(format!("measure-{name}.json"));
+        let output = cli().arg("run").arg(&script).args(extra).arg("--json-out").arg(&file).output().unwrap();
+        assert!(output.status.success(), "{name}: {}", String::from_utf8_lossy(&output.stderr));
+        assert!(output.stdout.is_empty(), "{name}");
+        let measure = assert_plain_utf8_json(&file, &on_stdout);
+        assert_eq!(measure["body_count"], 1, "{name}");
+    }
+}
+
+#[test]
+fn eval_json_out_holds_what_stdout_would() {
+    let dir = Scratch::new();
+    let script = dir.script();
+    let on_stdout = stdout_of(cli().arg("eval").arg(&script).output().unwrap());
+    // The option may come before the file to evaluate, and `inspect` is the same command.
+    for name in ["eval", "inspect"] {
+        let file = dir.0.join(format!("{name}.json"));
+        let output = cli().arg(name).arg("--json-out").arg(&file).arg(&script).output().unwrap();
+        assert!(output.status.success(), "{name}: {}", String::from_utf8_lossy(&output.stderr));
+        assert!(output.stdout.is_empty(), "{name}");
+        let measured = assert_plain_utf8_json(&file, &on_stdout);
+        assert_eq!(measured["body_count"], 1, "{name}");
+        // A character outside ASCII is written as it is, in UTF-8.
+        assert!(std::fs::read_to_string(&file).unwrap().contains("\u{d8} of the bore"), "{name}");
+    }
+}
+
+#[test]
+fn json_out_needs_a_file_and_fails_when_it_cannot_write() {
+    let dir = Scratch::new();
+    let script = dir.script();
+    for cmd in ["run", "eval"] {
+        let output = cli().arg(cmd).arg(&script).arg("--json-out").output().unwrap();
+        assert_eq!(output.status.code(), Some(1), "{cmd}");
+        assert!(String::from_utf8_lossy(&output.stderr).contains("--json-out needs a FILE"), "{cmd}");
+        assert!(output.stdout.is_empty(), "{cmd}");
+
+        let missing = dir.0.join("missing").join("out.json");
+        let output = cli().arg(cmd).arg(&script).arg("--json-out").arg(&missing).output().unwrap();
+        assert_eq!(output.status.code(), Some(1), "{cmd}");
+        assert!(!output.stderr.is_empty(), "{cmd}");
+        assert!(output.stdout.is_empty(), "{cmd}");
+        assert!(!missing.exists(), "{cmd}");
+    }
+}
+
+#[test]
+fn run_json_out_is_not_written_when_a_feature_fails() {
+    let dir = Scratch::new();
+    let script = dir.broken_script();
+    for (name, extra) in [("plain", &[][..]), ("results", &["--results"][..])] {
+        let file = dir.0.join(format!("failed-{name}.json"));
+        let output = cli().arg("run").arg(&script).args(extra).arg("--json-out").arg(&file).output().unwrap();
+        assert_eq!(output.status.code(), Some(1), "{name}");
+        assert!(String::from_utf8_lossy(&output.stderr).contains("nothing was written"), "{name}");
+        assert!(!file.exists(), "{name}");
+    }
+}

apps/solidcraft-cli/tests/mcp_connect.rs

@@ -1,18 +1,91 @@
-//! `mcp --connect` to a port where no app listens tells the user how to start one (#270).
+//! `mcp --connect` to a port where no app listens yet (#270): the server still starts, its tools
+//! say how to start the app, and once the app runs they reach it with that launch's token.
 
+use std::io::{BufRead, BufReader, Write};
 use std::net::TcpListener;
 use std::process::{Command, Stdio};
 
+use serde_json::{Value, json};
+
 #[test]
-fn mcp_connect_without_a_listening_app_names_the_control_flag() {
-    // A port that was free a moment ago: nothing listens on it.
-    let port = TcpListener::bind("127.0.0.1:0").unwrap().local_addr().unwrap().port();
-    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
-        .args(["mcp", "--connect", &format!("127.0.0.1:{port}")])
-        .stdin(Stdio::null())
-        .output()
+fn mcp_connect_serves_before_the_app_runs_and_reaches_it_once_it_does() {
+    // This test needs the port closed until its second phase. A port obtained
+    // with bind(:0) and released can immediately be reused by another parallel
+    // test's mock server. Stay below the usual ephemeral ranges,
+    // with a process-specific starting point, and skip any occupied ports.
+    let port = (0..512u32)
+        .find_map(|offset| {
+            let port = 16000 + (std::process::id() + offset) % 16000;
+            TcpListener::bind(("127.0.0.1", port as u16)).ok().map(|listener| listener.local_addr().unwrap().port())
+        })
+        .expect("an unused non-ephemeral test port");
+    let addr = format!("127.0.0.1:{port}");
+    let control_dir = std::env::temp_dir().join(format!("solidcraft-mcp-connect-{}-{port}", std::process::id()));
+    std::fs::create_dir_all(&control_dir).unwrap();
+    let mut child = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+        .args(["mcp", "--connect", &addr, "--allow-any-path"])
+        .env("SOLIDCRAFT_CONTROL_DIR", &control_dir)
+        .env_remove("SOLIDCRAFT_CONTROL_TOKEN")
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::null())
+        .spawn()
         .unwrap();
-    let stderr = String::from_utf8_lossy(&output.stderr);
-    assert!(!output.status.success(), "{stderr}");
-    assert!(stderr.contains("--control"), "say how to start the app with a control port: {stderr}");
+    let mut stdin = child.stdin.take().unwrap();
+    let mut stdout = BufReader::new(child.stdout.take().unwrap());
+    let mut ask = |id: u64, method: &str, params: Value| -> Value {
+        writeln!(stdin, "{}", json!({"jsonrpc": "2.0", "id": id, "method": method, "params": params})).unwrap();
+        let mut line = String::new();
+        stdout.read_line(&mut line).unwrap();
+        serde_json::from_str(&line).unwrap_or_else(|e| panic!("{e}: {line:?}"))
+    };
+    let measure = json!({"name": "measure", "arguments": {}});
+    let text = |r: &Value| r["result"]["content"][0]["text"].as_str().unwrap_or_default().to_string();
+
+    // The server answers without the app, and its instructions say the app isn't running.
+    let init = ask(1, "initialize", json!({"protocolVersion": "2025-06-18"}));
+    let instructions = init["result"]["instructions"].as_str().unwrap_or_default();
+    assert!(instructions.contains("not running") && instructions.contains(&format!("--control {port}")), "{instructions}");
+    let tools = ask(2, "tools/list", json!({}));
+    assert!(tools["result"]["tools"].as_array().is_some_and(|t| !t.is_empty()), "{tools}");
+
+    // A tool call says the app is not running and how to start it.
+    let r = ask(3, "tools/call", measure.clone());
+    assert_eq!(r["result"]["isError"], true, "{r}");
+    assert!(text(&r).contains("not running") && text(&r).contains(&format!("solidcraft --control {port}")), "{r}");
+
+    // The app starts: a token file for this launch, and its control port.
+    let token = "0123456789abcdef".repeat(4);
+    std::fs::write(control_dir.join(format!("{port}.token")), &token).unwrap();
+    let listener = TcpListener::bind(&addr).unwrap();
+    let app = std::thread::spawn(move || {
+        let (stream, _) = listener.accept().unwrap();
+        let mut line = String::new();
+        BufReader::new(stream.try_clone().unwrap()).read_line(&mut line).unwrap();
+        let req: Value = serde_json::from_str(&line).unwrap();
+        let reply = if req["token"] == json!(token) {
+            json!({"id": req["id"], "ok": true, "result": {"bodies": [], "method": req["method"]}})
+        } else {
+            json!({"id": req["id"], "ok": false, "error": format!("unauthorized: token {}", req["token"])})
+        };
+        writeln!(&stream, "{reply}").unwrap();
+    });
+    let r = ask(4, "tools/call", measure);
+    assert_ne!(r["result"]["isError"], true, "{r}");
+    assert!(text(&r).contains("engine.execute"), "{r}");
+    app.join().unwrap();
+
+    drop(stdin);
+    assert!(child.wait().unwrap().success());
+    std::fs::remove_dir_all(&control_dir).ok();
+}
+
+#[test]
+fn mcp_connect_without_a_port_is_refused_at_start() {
+    for addr in ["localhost", "127.0.0.1:0"] {
+        let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(["mcp", "--connect", addr]).stdin(Stdio::null()).output().unwrap();
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert!(!output.status.success(), "{addr}: {stderr}");
+        assert!(stderr.contains("HOST:PORT"), "{addr}: {stderr}");
+    }
 }

apps/solidcraft-cli/tests/mcp_param_check.rs

@@ -0,0 +1,50 @@
+//! `mcp --in script --param-check <level>`: the level applies to the script the session starts
+//! from too, so a misspelled key in it is refused (strict) or reported on stderr (warn) instead of
+//! silently ignored.
+
+use std::process::{Command, Stdio};
+
+#[test]
+fn param_check_applies_to_the_starting_script() {
+    let dir = std::env::temp_dir().join(format!("solidcraft-mcp-param-check-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let script = dir.join("typo.json");
+    let box_ = r#"{"command": "solid.box", "params": {"length": 5, "width": 5, "height": 5, "operaton": "cut"}}"#;
+    std::fs::write(&script, format!(r#"{{"commands": [{box_}]}}"#)).unwrap();
+    let run = |level: &str| {
+        Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+            .args(["mcp", "--in", script.to_str().unwrap(), "--param-check", level])
+            .stdin(Stdio::null())
+            .output()
+            .unwrap()
+    };
+    let strict = run("strict");
+    let stderr = String::from_utf8_lossy(&strict.stderr);
+    assert!(!strict.status.success(), "{stderr}");
+    assert!(stderr.contains("unknown key `operaton`; did you mean `operation`?"), "{stderr}");
+    // Warn: the script runs, and its warnings go to stderr.
+    let warn = run("warn");
+    let stderr = String::from_utf8_lossy(&warn.stderr);
+    assert!(warn.status.success(), "{stderr}");
+    assert!(stderr.contains("step 1: unknown key `operaton`; did you mean `operation`?"), "{stderr}");
+    // A warned step's warning is printed even when a later step fails.
+    let failing = dir.join("typo_then_failure.json");
+    std::fs::write(&failing, format!(r#"{{"commands": [{box_}, {{"command": "no.such_command"}}]}}"#)).unwrap();
+    let out = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+        .args(["mcp", "--in", failing.to_str().unwrap(), "--param-check", "warn"])
+        .stdin(Stdio::null())
+        .output()
+        .unwrap();
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(!out.status.success(), "{stderr}");
+    assert!(stderr.contains("step 1: unknown key `operaton`") && stderr.contains("step 2"), "{stderr}");
+    // Off: the script runs as before, and the server ends with its input.
+    let off = run("off");
+    assert!(off.status.success(), "{}", String::from_utf8_lossy(&off.stderr));
+    assert!(!String::from_utf8_lossy(&off.stderr).contains("operaton"));
+    // A bare flag is an error, not off.
+    let bare = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(["mcp", "--param-check"]).stdin(Stdio::null()).output().unwrap();
+    assert!(!bare.status.success());
+    assert!(String::from_utf8_lossy(&bare.stderr).contains("--param-check wants off, warn or strict"));
+    std::fs::remove_dir_all(&dir).ok();
+}

apps/solidcraft-cli/tests/model_cache.rs

@@ -0,0 +1,209 @@
+//! A design opened from the model its file keeps is the design evaluated again: the same
+//! results, the same bodies (to the bit), the same face names and volumes after every feature,
+//! and the same after an edit made to both.
+
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+use solidcraft_engine::doc::{ModelBody, ModelState};
+
+fn corpus() -> Vec<PathBuf> {
+    let dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/corpus");
+    let mut v: Vec<PathBuf> =
+        std::fs::read_dir(&dir).unwrap().flatten().map(|e| e.path()).filter(|p| p.extension().is_some_and(|x| x == "solidcraft")).collect();
+    v.sort();
+    v
+}
+
+fn temp(name: &str) -> PathBuf {
+    std::env::temp_dir().join(format!("solidcraft-model-cache-{}-{name}.solidcraft", std::process::id()))
+}
+
+fn open(path: &Path) -> Session {
+    let mut s = Session::default();
+    s.execute("doc.open", &json!({"path": path.to_string_lossy()})).unwrap_or_else(|e| panic!("{}: {e}", path.display()));
+    s
+}
+
+fn body(name: &str, b: &ModelBody) -> Value {
+    let measured = solidcraft_engine::kernel::measure(&b.body).ok();
+    json!({
+        "name": b.name, "feature": b.feature, "component": b.component, "source": b.source_name, "transferred": b.transferred,
+        "brep": solidcraft_engine::kernel::encode_native_body(&b.body).map(|bytes| format!("{:x}", sha(&bytes))).unwrap_or_else(|e| format!("{name}: {e}")),
+        "faces": *solidcraft_engine::doc::naming::face_names(b),
+        "volume": measured.as_ref().map(|m| m.volume.to_bits()), "area": measured.as_ref().map(|m| m.area.to_bits()),
+        "look": b.imported.as_ref().map(|l| format!("{l:?}")),
+    })
+}
+
+fn sha(bytes: &[u8]) -> u128 {
+    use std::hash::{Hash, Hasher};
+    let mut h = std::collections::hash_map::DefaultHasher::new();
+    bytes.hash(&mut h);
+    let a = h.finish();
+    bytes.len().hash(&mut h);
+    (u128::from(a) << 64) | u128::from(h.finish())
+}
+
+fn state(name: &str, st: &Arc<ModelState>) -> Value {
+    json!({
+        "bodies": st.bodies.iter().map(|b| body(name, b)).collect::<Vec<_>>(),
+        "sketches": st.sketches.iter().map(|s| json!([s.feature, s.name, s.plane, s.sketch, s.report, s.profiles.len()])).collect::<Vec<_>>(),
+        "counter": st.body_counter, "sheets": st.sheets, "threads": st.threads, "construct": format!("{:?}", st.construct),
+    })
+}
+
+/// Everything a model holds that the rest of the app reads.
+fn model(name: &str, s: &Session) -> Value {
+    let results: Vec<Value> = s
+        .model
+        .results
+        .iter()
+        .map(|r| json!({"id": r.id, "name": r.name, "error": r.error, "warning": r.warning, "skipped": r.skipped, "state": state(name, &r.state)}))
+        .collect();
+    json!({"results": results, "world": state(name, &s.world_state())})
+}
+
+/// The same edit on both: a parameter's value when the design has one, else a new body.
+fn edit(s: &mut Session) {
+    let param = s.doc.params.first().map(|p| (p.name.clone(), p.expr.clone()));
+    match param {
+        Some((name, expr)) => {
+            s.execute("parameters.change", &json!({"name": name, "expression": format!("({expr}) * 1.05")})).unwrap();
+        }
+        None => {
+            s.execute("solid.box", &json!({"length": 7, "width": 8, "height": 9, "operation": "new"})).unwrap();
+        }
+    }
+}
+
+fn check(name: &str, mut built: Session) {
+    let path = temp(name);
+    built.execute("file.save_as", &json!({"path": path.to_string_lossy()})).unwrap();
+    let bytes = std::fs::read(&path).unwrap();
+    assert!(solidcraft_engine::io::read_design_geometry(&bytes).is_some(), "{name}: the save keeps the model");
+    let mut cached = open(&path);
+    assert_eq!(cached.model.last_recomputed, 0, "{name}: opened without evaluating");
+    let mut rebuilt = Session::new(solidcraft_engine::io::read_design(&bytes).unwrap());
+    assert!(rebuilt.model.last_recomputed > 0);
+    assert_eq!(model(name, &cached), model(name, &rebuilt), "{name}: opened from the file's model");
+    edit(&mut cached);
+    edit(&mut rebuilt);
+    assert_eq!(model(name, &cached), model(name, &rebuilt), "{name}: after the same edit");
+    cached.execute("edit.undo", &json!({})).unwrap();
+    rebuilt.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(model(name, &cached), model(name, &rebuilt), "{name}: after undoing it");
+    let _ = std::fs::remove_file(&path);
+    let _ = std::fs::remove_file(format!("{}.bak", path.display()));
+}
+
+#[test]
+fn corpus_designs_open_from_their_model_as_evaluated() {
+    for p in corpus() {
+        let name = p.file_stem().unwrap_or_default().to_string_lossy().to_string();
+        let s = open(&p);
+        // Names saved before format 14 are found again through names worked out from geometry on
+        // demand, which a saved model does not keep.
+        let legacy = s.doc.to_json().contains(&format!("\"{}", solidcraft_engine::doc::naming::LEGACY_MARK));
+        if s.model.results.iter().any(|r| r.error.is_some()) || legacy {
+            // Not kept: a model with errors, or names saved before format 14.
+            let path = temp(&name);
+            let mut s = s;
+            s.execute("file.save_as", &json!({"path": path.to_string_lossy()})).unwrap();
+            assert!(solidcraft_engine::io::read_design_geometry(&std::fs::read(&path).unwrap()).is_none(), "{name}");
+            let _ = std::fs::remove_file(&path);
+            let _ = std::fs::remove_file(format!("{}.bak", path.display()));
+            continue;
+        }
+        check(&name, s);
+    }
+}
+
+#[test]
+fn sample_designs_open_from_their_model_as_evaluated() {
+    for sample in solidcraft_engine::sample::samples() {
+        let mut s = Session::default();
+        for c in (sample.script)()["commands"].as_array().unwrap() {
+            s.execute(c["command"].as_str().unwrap(), &c["params"]).unwrap_or_else(|e| panic!("{}: {e}", sample.name));
+        }
+        check(sample.name, s);
+    }
+}
+
+#[test]
+fn imported_assemblies_open_from_their_model_as_evaluated() {
+    // A STEP assembly of the hinge sample: parts placed several times.
+    let mut source = Session::default();
+    let hinge = solidcraft_engine::sample::samples().into_iter().find(|s| s.name == "Hinge Assembly").unwrap();
+    for c in (hinge.script)()["commands"].as_array().unwrap() {
+        source.execute(c["command"].as_str().unwrap(), &c["params"]).unwrap();
+    }
+    let step = std::env::temp_dir().join(format!("solidcraft-model-cache-{}-hinge.step", std::process::id()));
+    source.execute("file.export", &json!({"path": step.to_string_lossy()})).unwrap();
+    let mut s = Session::default();
+    s.execute("file.insert_step", &json!({"path": step.to_string_lossy()})).unwrap();
+    s.execute("file.insert_step", &json!({"path": step.to_string_lossy(), "matrix": [1, 0, 0, 200, 0, 1, 0, 0, 0, 0, 1, 0]})).unwrap();
+    let _ = std::fs::remove_file(&step);
+    check("imported hinge", s);
+}
+
+/// Opened from its model, a design evaluates only from the first feature an edit changes: the
+/// saved states before it are kept as they were read (the same states, not evaluated again).
+#[test]
+fn an_edit_after_opening_evaluates_from_the_feature_it_changes() {
+    let plate = solidcraft_engine::sample::samples().into_iter().find(|s| s.name == "Sample Plate").unwrap();
+    let mut built = Session::default();
+    for c in (plate.script)()["commands"].as_array().unwrap() {
+        built.execute(c["command"].as_str().unwrap(), &c["params"]).unwrap();
+    }
+    let path = temp("incremental");
+    built.execute("file.save_as", &json!({"path": path.to_string_lossy()})).unwrap();
+    let n = built.doc.features.len();
+    assert!(n >= 4);
+    let mut s = open(&path);
+    assert_eq!(s.model.last_recomputed, 0);
+    let read: Vec<Arc<ModelState>> = s.model.results.iter().map(|r| r.state.clone()).collect();
+    // How many of the first features still have the states read from the file.
+    let kept = |s: &Session| s.model.results.iter().zip(&read).take_while(|(r, st)| Arc::ptr_eq(&r.state, st)).count();
+    // The marker moved back and forth: the features before it are as read.
+    s.execute("timeline.rollback", &json!({"position": n - 2})).unwrap();
+    assert_eq!(kept(&s), n - 2, "rolled back");
+    s.execute("timeline.rollback", &json!({})).unwrap();
+    assert_eq!(kept(&s), n, "rolled forward: the features after the marker take their saved results again");
+    // Suppressing the second-to-last feature keeps every state before it.
+    let k = s.doc.features[n - 2].id;
+    s.execute("timeline.suppress", &json!({"feature": k, "suppressed": true})).unwrap();
+    assert_eq!(kept(&s), n - 2, "evaluated from the suppressed feature on");
+    s.execute("edit.undo", &json!({})).unwrap();
+    // A new feature at the end starts from the final state read from the file.
+    let mut s = open(&path);
+    let read: Vec<Arc<ModelState>> = s.model.results.iter().map(|r| r.state.clone()).collect();
+    s.execute("solid.box", &json!({"length": 3, "width": 3, "height": 3, "operation": "new"})).unwrap();
+    assert_eq!(s.model.results.len(), n + 1);
+    assert!(s.model.results.iter().zip(&read).all(|(r, st)| Arc::ptr_eq(&r.state, st)), "only the new feature evaluated");
+    let _ = std::fs::remove_file(&path);
+    let _ = std::fs::remove_file(format!("{}.bak", path.display()));
+}
+
+/// An edit made after opening and undone finds the saved results again: undo evaluates nothing.
+#[test]
+fn undoing_an_edit_after_opening_reuses_the_saved_results() {
+    let plate = solidcraft_engine::sample::samples().into_iter().find(|s| s.name == "Sample Plate").unwrap();
+    let mut built = Session::default();
+    for c in (plate.script)()["commands"].as_array().unwrap() {
+        built.execute(c["command"].as_str().unwrap(), &c["params"]).unwrap();
+    }
+    let path = temp("undo");
+    built.execute("file.save_as", &json!({"path": path.to_string_lossy()})).unwrap();
+    let mut s = open(&path);
+    let read: Vec<Arc<ModelState>> = s.model.results.iter().map(|r| r.state.clone()).collect();
+    let first = s.doc.features[1].id;
+    s.execute("timeline.suppress", &json!({"feature": first, "suppressed": true})).unwrap();
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.model.last_recomputed, 0, "taken from the saved results");
+    assert!(s.model.results.iter().zip(&read).all(|(r, st)| Arc::ptr_eq(&r.state, st)), "the very states read from the file");
+    let _ = std::fs::remove_file(&path);
+    let _ = std::fs::remove_file(format!("{}.bak", path.display()));
+}

apps/solidcraft-cli/tests/oracle_cases.rs

@@ -0,0 +1,66 @@
+//! The reference tests (tests/oracle, docs/oracle.md) as a `cargo test`, so tools that drive
+//! `cargo test` (cargo-mutants) can use them: every case with expected values and no
+//! `known_failure` mark must pass, as `cargo xtask oracle` requires.
+
+use std::path::Path;
+use std::process::Command;
+
+use serde_json::Value;
+
+#[test]
+#[ignore = "run by cargo-mutants (.cargo/mutants.toml); CI replays the oracle through cargo xtask oracle"]
+fn oracle_suite() {
+    let root = Path::new(env!("CARGO_MANIFEST_DIR")).join("../..");
+    let dir = root.join("tests/oracle");
+    let mut cases: Vec<String> = std::fs::read_dir(&dir)
+        .unwrap()
+        .flatten()
+        .map(|e| e.path())
+        .filter(|p| p.join("recipe.json").is_file())
+        .map(|p| format!("tests/oracle/{}", p.file_name().unwrap().to_string_lossy()))
+        .collect();
+    cases.sort();
+    assert!(cases.len() >= 50, "oracle cases in {}", dir.display());
+    // One process per core, cases dealt round-robin so the slow ones spread out.
+    let n = std::thread::available_parallelism().map_or(4, |n| n.get()).min(cases.len());
+    let children: Vec<_> = (0..n)
+        .map(|i| {
+            let chunk: Vec<&String> = cases.iter().skip(i).step_by(n).collect();
+            Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+                .current_dir(&root)
+                .arg("oracle")
+                .arg("--json")
+                .args(chunk)
+                .stdout(std::process::Stdio::piped())
+                .stderr(std::process::Stdio::piped())
+                .spawn()
+                .unwrap()
+        })
+        .collect();
+    let mut results: Vec<Value> = Vec::new();
+    for child in children {
+        let out = child.wait_with_output().unwrap();
+        let part: Vec<Value> =
+            serde_json::from_slice(&out.stdout).unwrap_or_else(|e| panic!("oracle JSON: {e}\n{}", String::from_utf8_lossy(&out.stderr)));
+        results.extend(part);
+    }
+    assert_eq!(results.len(), cases.len());
+    let mut failed = Vec::new();
+    for r in &results {
+        let case = r["case"].as_str().unwrap_or("");
+        let want: Value =
+            std::fs::read_to_string(dir.join(case).join("expected.json")).ok().and_then(|t| serde_json::from_str(&t).ok()).unwrap_or_default();
+        if want.is_null() || want["known_failure"].is_string() || r["pass"].as_bool().unwrap_or(false) {
+            continue;
+        }
+        let checks: Vec<String> = r["checks"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .filter(|c| !c["ok"].as_bool().unwrap_or(false))
+            .map(|c| format!("{} got {} want {}", c["check"].as_str().unwrap_or(""), c["got"], c["want"]))
+            .collect();
+        failed.push(format!("{case}: {} {}", r["error"].as_str().unwrap_or(""), checks.join("; ")));
+    }
+    assert!(failed.is_empty(), "oracle cases failed:\n{}", failed.join("\n"));
+}

apps/solidcraft-cli/tests/rebuild_topology.rs

@@ -0,0 +1,203 @@
+//! A parameter change gives the same topology as building at the new value from scratch, and
+//! changing it back gives the original topology: no stale splits, no faces added to regions
+//! nothing touched. Over the design corpus (`tests/corpus`, `tests/action_matrix/designs`), and
+//! the README demo's Raspberry Pi case pinned step by step.
+
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+use solidcraft_engine::doc::kernel::{FaceSurface, face_surface};
+
+fn root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("../..").canonicalize().unwrap()
+}
+
+/// A folder of its own for test `name` (tests run side by side).
+fn scratch_dir(name: &str) -> PathBuf {
+    let d = std::env::temp_dir().join(format!("solidcraft-rebuild-topology-{name}-{}", std::process::id()));
+    std::fs::create_dir_all(&d).unwrap();
+    d
+}
+
+/// A body's topology: its face and edge counts, and how many faces lie in each plane.
+#[derive(Debug, PartialEq, Eq)]
+struct Topology {
+    faces: usize,
+    edges: usize,
+    planes: BTreeMap<[i64; 4], usize>,
+}
+
+/// Every solid body's topology, by name.
+fn topology(s: &Session) -> BTreeMap<String, Topology> {
+    let st = s.world_state();
+    st.bodies
+        .iter()
+        .filter(|b| !b.body.is_mesh())
+        .map(|b| {
+            let mut planes = BTreeMap::new();
+            for i in 0..b.body.face_count() {
+                if let Some(FaceSurface::Plane { normal, point }) = face_surface(&b.body, i) {
+                    let key = [normal.x, normal.y, normal.z, normal.dot(point) / 100.].map(|x| (x * 1e4).round() as i64);
+                    *planes.entry(key).or_insert(0) += 1;
+                }
+            }
+            (b.name.clone(), Topology { faces: b.body.face_count(), edges: b.body.edge_count(), planes })
+        })
+        .collect()
+}
+
+fn open(path: &Path) -> Session {
+    let mut s = Session::default();
+    s.execute("doc.open", &json!({"path": path.to_string_lossy()})).unwrap_or_else(|e| panic!("{}: {e}", path.display()));
+    s
+}
+
+/// The design built from scratch: saved as it is (timeline only, no cached geometry) and
+/// opened again.
+fn rebuilt(s: &Session, path: &Path) -> Session {
+    let mut t = s.scratch();
+    t.execute("file.save", &json!({"path": path.to_string_lossy(), "format": "json"})).unwrap();
+    open(path)
+}
+
+fn errors(s: &Session) -> Vec<u64> {
+    s.model.results.iter().filter(|r| r.error.is_some()).map(|r| r.id).collect()
+}
+
+/// The corpus's designs, as sessions.
+fn designs() -> Vec<(String, Session)> {
+    let root = root();
+    let mut out = Vec::new();
+    for dir in ["apps/solidcraft-cli/tests/corpus", "tests/action_matrix/designs"] {
+        let mut files: Vec<PathBuf> = std::fs::read_dir(root.join(dir))
+            .unwrap()
+            .flatten()
+            .map(|e| e.path())
+            .filter(|p| p.extension().is_some_and(|x| x == "solidcraft" || x == "json") && !p.to_string_lossy().ends_with(".expected.json"))
+            .collect();
+        files.sort();
+        for p in files {
+            let name = p.file_stem().unwrap_or_default().to_string_lossy().to_string();
+            let s = if p.extension().is_some_and(|x| x == "solidcraft") {
+                open(&p)
+            } else {
+                let mut s = Session::default();
+                let script: Value = serde_json::from_slice(&std::fs::read(&p).unwrap()).unwrap();
+                s.run_script(&script).unwrap_or_else(|e| panic!("{name}: {e}"));
+                if s.active_sketch.is_some() {
+                    let _ = s.execute("sketch.finish", &json!({}));
+                }
+                s
+            };
+            out.push((name, s));
+        }
+    }
+    out
+}
+
+/// For each design and its first length parameter that edits cleanly (the user's first): the parameter
+/// scaled by 1.1 gives what a fresh build at that value gives, and setting it back gives the
+/// original topology.
+#[test]
+fn a_parameter_edit_rebuilds_like_a_fresh_build_and_reverts_exactly() {
+    let dir = scratch_dir("corpus");
+    let mut problems = Vec::new();
+    let mut checked = 0;
+    for (name, s) in designs() {
+        let original = topology(&s);
+        let before = errors(&s);
+        let mut params: Vec<_> = s.doc.params.iter().filter(|p| p.unit == "mm").cloned().collect();
+        params.sort_by_key(|p| p.model);
+        let mut tried = 0;
+        for p in params {
+            if tried == 1 {
+                break;
+            }
+            let mut t = s.scratch();
+            let expr = format!("({}) * 1.1", p.expr);
+            if t.execute("parameters.change", &json!({"name": p.name, "expression": expr})).is_err() || errors(&t) != before {
+                continue;
+            }
+            tried += 1;
+            checked += 1;
+            let edited = topology(&t);
+            let fresh = topology(&rebuilt(&t, &dir.join(format!("{name}-{}.solidcraft", p.name))));
+            if edited != fresh {
+                problems.push(format!("{name}: {} = {expr}: edited {edited:?}\n  fresh {fresh:?}", p.name));
+            }
+            t.execute("parameters.change", &json!({"name": p.name, "expression": p.expr})).unwrap();
+            let back = topology(&t);
+            if back != original {
+                problems.push(format!("{name}: {} back to {}: {back:?}\n  original {original:?}", p.name, p.expr));
+            }
+        }
+    }
+    let _ = std::fs::remove_dir_all(&dir);
+    assert!(checked >= 8, "only {checked} parameter edits checked");
+    assert!(problems.is_empty(), "{}", problems.join("\n"));
+}
+
+/// The README demo's Raspberry Pi case (`examples/demo/enclosure_ui_mcp.py --story pi`): its
+/// face count after each feature, and each outer side (the four walls and the bottom) one face
+/// throughout: (a) built at height 24, (b) built at 24 and changed to 32 in Parameters, (c)
+/// built at 32. The port cut-outs and the floor vents used to split the long wall (or the end
+/// wall at 24) into strips along the openings' tops and bottoms.
+#[test]
+fn pi_case_faces_per_step_at_both_heights() {
+    // Sketch1 (1) .. RectangularPattern2 (14): the faces once features 1..=k are built.
+    const FACES: [(usize, usize); 13] =
+        [(2, 6), (3, 10), (4, 19), (5, 19), (6, 25), (7, 43), (8, 43), (9, 55), (10, 55), (11, 59), (12, 59), (13, 63), (14, 79)];
+    let dir = scratch_dir("pi");
+    let design: Value = serde_json::from_slice(&std::fs::read(root().join("tests/action_matrix/designs/pi-case.solidcraft")).unwrap()).unwrap();
+    let at = |height: &str, file: &str| {
+        let mut d = design.clone();
+        for p in d["params"].as_array_mut().unwrap() {
+            if p["name"] == "height" {
+                p["expr"] = json!(height);
+            }
+        }
+        let path = dir.join(file);
+        std::fs::write(&path, serde_json::to_vec(&d).unwrap()).unwrap();
+        open(&path)
+    };
+    let a = at("24 mm", "pi-24.solidcraft");
+    let mut b = at("24 mm", "pi-24-to-32.solidcraft");
+    b.execute("parameters.change", &json!({"name": "height", "expression": "32 mm"})).unwrap();
+    let c = at("32 mm", "pi-32.solidcraft");
+    let _ = std::fs::remove_dir_all(&dir);
+    let mut per_case = Vec::new();
+    for (case, s, h) in [("(a) at 24", a, 24.), ("(b) 24 changed to 32", b, 32.), ("(c) at 32", c, 32.)] {
+        assert!(errors(&s).is_empty(), "{case}: features fail: {:?}", errors(&s));
+        let mut steps = Vec::new();
+        for (k, want) in FACES {
+            let mut t = s.scratch();
+            t.execute("timeline.rollback", &json!({"position": k})).unwrap();
+            let st = t.world_state();
+            let body = st.bodies.iter().find(|b| b.name == "Body1").unwrap();
+            assert_eq!(body.body.face_count(), want, "{case}: faces after feature {k}");
+            // Each outer side: the faces in its plane.
+            for (n, d) in [([0., -1., 0.], 33.), ([0., 1., 0.], 33.), ([-1., 0., 0.], 47.5), ([1., 0., 0.], 47.5), ([0., 0., -1.], 0.)] {
+                let on = (0..body.body.face_count())
+                    .filter(|&i| match face_surface(&body.body, i) {
+                        Some(FaceSurface::Plane { normal, point }) => {
+                            (normal.x - n[0]).abs() + (normal.y - n[1]).abs() + (normal.z - n[2]).abs() < 1e-6 && (normal.dot(point) - d).abs() < 1e-6
+                        }
+                        _ => false,
+                    })
+                    .count();
+                assert_eq!(on, 1, "{case}: after feature {k} the outer side facing {n:?} is {on} faces");
+            }
+            let bbox_top = body.mesh().bounds().max.z;
+            assert!((bbox_top - h).abs() < 1e-6, "{case}: height {bbox_top}");
+            steps.push(topology(&t));
+        }
+        per_case.push((case, steps));
+    }
+    // (b) and (c): the same topology after every feature.
+    let (b, c) = (&per_case[1].1, &per_case[2].1);
+    for (k, (x, y)) in b.iter().zip(c).enumerate() {
+        assert_eq!(x, y, "after feature {}: (b) differs from (c)", k + 2);
+    }
+}

apps/solidcraft-cli/tests/run_results.rs

@@ -132,3 +132,80 @@ fn legacy_extension_and_format_tag_still_open() {
     let reopened = solidcraft_engine::io::read_design(&std::fs::read(&resaved).unwrap()).unwrap();
     assert!(reopened.to_json().contains("\"solidcraft/"));
 }
+
+/// `snapshot` starts from `--in` as `run` does (its script runs on that design), and refuses an
+/// option it doesn't take rather than ignoring it.
+#[test]
+fn snapshot_runs_its_script_on_the_in_design() {
+    let dir = Scratch::new();
+    let base = dir.0.join("base.solidcraft");
+    json_output(cli().arg("run").arg(dir.script()).arg("--save").arg(&base).output().unwrap());
+    let shifted = dir.0.join("shifted.json");
+    std::fs::write(
+        &shifted,
+        json!({"commands": [{"command": "solid.box", "params": {"length": 2, "width": 3, "height": 4, "corner": [10, 0, 0]}}]}).to_string(),
+    )
+    .unwrap();
+    let shot = |name: &str, args: &[&std::ffi::OsStr]| {
+        let png = dir.0.join(name);
+        json_output(cli().arg("snapshot").args(args).arg("--out").arg(&png).args(["--width", "64", "--height", "48"]).output().unwrap());
+        std::fs::read(&png).unwrap()
+    };
+    // Pictures are drawn on the GPU: without an adapter only the option checks below run.
+    match solidcraft_gpu::capture::shared() {
+        Ok(_) => {
+            let alone = shot("alone.png", &[shifted.as_os_str()]);
+            let on_base = shot("on_base.png", &[shifted.as_os_str(), "--in".as_ref(), base.as_os_str()]);
+            let base_only = shot("base.png", &["--in".as_ref(), base.as_os_str()]);
+            assert_ne!(alone, on_base, "the script ran on the --in design");
+            assert_ne!(base_only, on_base);
+        }
+        Err(e @ solidcraft_gpu::GpuError::NoAdapter(_)) if std::env::var_os("SOLIDCRAFT_REQUIRE_GPU").is_none() => {
+            eprintln!("pictures left out: {e}")
+        }
+        Err(e) => panic!("{e}"),
+    }
+    for (bad, says) in [(["--frobnicate", "1"], "doesn't take --frobnicate"), (["--width", "wide"], "--width must be 16 to 8192")] {
+        let output = cli().arg("snapshot").arg(&base).arg("--out").arg(dir.0.join("x.png")).args(bad).output().unwrap();
+        assert_eq!(output.status.code(), Some(1));
+        assert!(String::from_utf8_lossy(&output.stderr).contains(says), "{}", String::from_utf8_lossy(&output.stderr));
+    }
+}
+
+/// An unknown command's error suggests the id that was meant.
+#[test]
+fn unknown_command_suggests_the_closest_id() {
+    let output = cli().args(["exec", "file.open"]).output().unwrap();
+    assert_eq!(output.status.code(), Some(1));
+    assert!(String::from_utf8_lossy(&output.stderr).contains("did you mean `doc.open`?"), "{}", String::from_utf8_lossy(&output.stderr));
+}
+
+/// #1833: `--timings` reports each command's time instead of the measurement, `--profile` adds
+/// the kernel's share, `--results` puts the results beside them, and files are still written.
+#[test]
+fn timings_and_profile_report_each_command() {
+    let dir = Scratch::new();
+    let saved = dir.0.join("timed.solidcraft");
+    let t = json_output(cli().arg("run").arg(dir.script()).arg("--timings").arg("--save").arg(&saved).output().unwrap());
+    let rows = t["timings"].as_array().unwrap();
+    assert_eq!(rows.len(), 1);
+    assert_eq!((rows[0]["index"].as_u64(), rows[0]["command"].as_str()), (Some(0), Some("solid.box")));
+    assert!(rows[0]["ms"].as_f64().is_some() && t["total_ms"].as_f64().is_some(), "{t}");
+    assert!(rows[0].get("profile").is_none() && t.get("results").is_none(), "{t}");
+    assert_eq!(body_count(&saved), 1);
+
+    // --profile alone implies --timings; a flag before the script doesn't eat it.
+    let t = json_output(cli().arg("run").arg("--profile").arg(dir.script()).arg("--results").output().unwrap());
+    let p = &t["timings"][0]["profile"];
+    for k in ["boolean_ms", "tessellate_ms", "other_ms"] {
+        assert!(p[k].as_f64().is_some_and(|ms| ms >= 0.0), "{k}: {t}");
+    }
+    assert_eq!(t["results"].as_array().map(Vec::len), Some(1), "{t}");
+
+    // --results alone stays a plain array.
+    assert!(json_output(cli().arg("run").arg(dir.script()).arg("--results").output().unwrap()).is_array());
+
+    let output = cli().arg("run").arg("--in").arg(&saved).arg("--timings").output().unwrap();
+    assert!(!output.status.success());
+    assert!(String::from_utf8_lossy(&output.stderr).contains("--timings needs a script"));
+}

apps/solidcraft-cli/tests/script_roundtrip.rs

@@ -0,0 +1,125 @@
+//! A design's command script (`timeline.export_script`, #886) replays into the same design:
+//! every corpus design that the script supports comes back with the same timeline, parameters,
+//! settings and bodies.
+
+use std::path::{Path, PathBuf};
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+
+fn corpus() -> Vec<PathBuf> {
+    let dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/corpus");
+    let mut v: Vec<PathBuf> =
+        std::fs::read_dir(&dir).unwrap().flatten().map(|e| e.path()).filter(|p| p.extension().is_some_and(|x| x == "solidcraft")).collect();
+    v.sort();
+    assert!(v.len() >= 7, "corpus files in {}", dir.display());
+    v
+}
+
+/// Designs with components or joints, which scripts do not support yet.
+const ASSEMBLIES: [&str; 2] = ["components-arm", "joints-hinge"];
+
+fn bodies(s: &mut Session) -> Vec<(String, f64, f64, Value)> {
+    let m = s.execute("inspect.measure", &json!({})).unwrap();
+    let mut v: Vec<_> = m["bodies"]
+        .as_array()
+        .into_iter()
+        .flatten()
+        .map(|b| {
+            (
+                b["name"].as_str().unwrap_or_default().to_string(),
+                b["volume_mm3"].as_f64().unwrap(),
+                b["area_mm2"].as_f64().unwrap(),
+                b["faces"].clone(),
+            )
+        })
+        .collect();
+    v.sort_by(|a, b| a.0.cmp(&b.0));
+    v
+}
+
+fn errors(s: &Session) -> Vec<(u64, Option<String>)> {
+    s.model.results.iter().map(|r| (r.id, r.error.clone())).collect()
+}
+
+fn params(s: &Session) -> Vec<solidcraft_engine::doc::Param> {
+    let mut v = s.doc.params.clone();
+    v.sort_by(|a, b| a.name.cmp(&b.name));
+    v
+}
+
+#[test]
+fn corpus_designs_replay_from_their_scripts() {
+    let mut replayed = 0;
+    for p in corpus() {
+        let name = p.file_stem().unwrap_or_default().to_string_lossy().to_string();
+        let mut s = Session::default();
+        s.execute("doc.open", &json!({"path": p.to_string_lossy()})).unwrap();
+        let r = match s.execute("timeline.export_script", &json!({})) {
+            Ok(r) => r,
+            Err(e) => {
+                assert!(ASSEMBLIES.contains(&name.as_str()), "{name}: {e}");
+                assert!(e.to_string().contains("not supported yet"), "{name}: {e}");
+                continue;
+            }
+        };
+        assert!(!ASSEMBLIES.contains(&name.as_str()), "{name} has components: the script should refuse it");
+        // Through text, as a script file would carry it.
+        let script: Value = serde_json::from_str(&r["script"].to_string()).unwrap();
+        let mut t = Session::default();
+        t.run_script(&script).unwrap_or_else(|e| panic!("{name}: {e}"));
+        assert_eq!(t.doc.features, s.doc.features, "{name}: timeline");
+        assert_eq!(params(&t), params(&s), "{name}: parameters");
+        assert_eq!(t.doc.marker, s.doc.marker, "{name}: marker");
+        assert_eq!(t.doc.units, s.doc.units, "{name}: units");
+        assert_eq!(t.doc.sheet, s.doc.sheet, "{name}: sheet metal rules");
+        assert_eq!(t.doc.plastic, s.doc.plastic, "{name}: plastic rules");
+        assert_eq!(t.doc.materials, s.doc.materials, "{name}: materials");
+        assert_eq!(t.doc.user_materials, s.doc.user_materials, "{name}: user materials");
+        assert_eq!(t.doc.favorites, s.doc.favorites, "{name}: favourites");
+        assert_eq!(t.doc.param_comments, s.doc.param_comments, "{name}: comments");
+        assert_eq!(errors(&t), errors(&s), "{name}: feature results");
+        assert_eq!(bodies(&mut t), bodies(&mut s), "{name}: bodies");
+        replayed += 1;
+    }
+    assert!(replayed >= 7, "replayed {replayed} corpus designs");
+}
+
+/// #1990: a sketch and its extrude may share a name, and the design's script still replays,
+/// keeping the names: the replayed design's own script has the same steps.
+#[test]
+fn a_design_naming_a_sketch_and_its_extrude_alike_replays_from_its_script() {
+    let dir = std::env::temp_dir().join(format!("solidcraft-shared-names-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let cli = |args: &[&std::ffi::OsStr]| {
+        let out = std::process::Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(args).output().unwrap();
+        assert!(
+            out.status.success(),
+            "{}: {}",
+            args.iter().map(|a| a.to_string_lossy()).collect::<Vec<_>>().join(" "),
+            String::from_utf8_lossy(&out.stderr)
+        );
+    };
+    let script = dir.join("mini.json");
+    let saved = dir.join("mini.solidcraft");
+    let exported = dir.join("rt.json");
+    let replayed = dir.join("rt.solidcraft");
+    let again = dir.join("rt2.json");
+    let commands = json!({"commands": [
+        {"command": "sketch.create", "params": {"plane": "XY", "name": "Block"}},
+        {"command": "sketch.rectangle.two_point", "params": {"p0": [0, 0], "p1": [20, 10]}},
+        {"command": "sketch.finish", "params": {}},
+        {"command": "solid.extrude", "params": {"distance": "5", "name": "Block"}},
+    ]});
+    std::fs::write(&script, commands.to_string()).unwrap();
+    cli(&["run".as_ref(), script.as_ref(), "--save".as_ref(), saved.as_ref()]);
+    cli(&["script".as_ref(), saved.as_ref(), "--out".as_ref(), exported.as_ref()]);
+    cli(&["run".as_ref(), exported.as_ref(), "--save".as_ref(), replayed.as_ref()]);
+    cli(&["script".as_ref(), replayed.as_ref(), "--out".as_ref(), again.as_ref()]);
+    let first: Value = serde_json::from_str(&std::fs::read_to_string(&exported).unwrap()).unwrap();
+    let second: Value = serde_json::from_str(&std::fs::read_to_string(&again).unwrap()).unwrap();
+    let _ = std::fs::remove_dir_all(&dir);
+    let names: Vec<&str> = first["commands"].as_array().unwrap().iter().filter_map(|c| c["params"]["feature"]["name"].as_str()).collect();
+    assert_eq!(names, ["Block", "Block"], "{first:#}");
+    assert_eq!(second["commands"], first["commands"], "the replayed design's script has the same steps");
+}

apps/solidcraft-cli/tests/snapshot_appearance.rs

@@ -0,0 +1,221 @@
+//! `snapshot --body`, `--tool` and `--section`: a picture of a tool body inside the material it
+//! meets, which is the one picture that says whether a cut reaches through.
+//!
+//! Each option is a shortcut for the command the app itself runs (`appearance.assign`,
+//! `inspect.section`), so every test here asserts that the option's picture is the picture of a
+//! script that runs those commands — not that the pixels match a stored image. Pictures are
+//! compared with a tolerance, and the tests run on whatever renderer the machine has (a GPU, a
+//! software adapter, or the CPU rasterizer), because they only ever compare two pictures this
+//! same CLI drew.
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Output};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use serde_json::{Value, json};
+
+static NEXT: AtomicUsize = AtomicUsize::new(0);
+
+const SIZE: (u32, u32) = (200, 140);
+
+/// A PNG's size and RGBA pixels.
+fn decode(png: &[u8]) -> (u32, u32, Vec<u8>) {
+    let img = image::load_from_memory_with_format(png, image::ImageFormat::Png).unwrap().to_rgba8();
+    (img.width(), img.height(), img.into_raw())
+}
+
+/// Pixels of two same-sized pictures that differ by more than a little in some channel.
+fn differing(a: &[u8], b: &[u8]) -> usize {
+    let ((wa, ha, a), (wb, hb, b)) = (decode(a), decode(b));
+    assert_eq!((wa, ha), (wb, hb), "pictures of different sizes");
+    a.as_chunks::<4>().0.iter().zip(b.as_chunks::<4>().0).filter(|(p, q)| p.iter().zip(q.iter()).any(|(x, y)| x.abs_diff(*y) > 16)).count()
+}
+
+/// The same picture: a renderer's output may differ by a few levels or a stray edge pixel.
+#[track_caller]
+fn assert_same(a: &[u8], b: &[u8], what: &str) {
+    let (n, total) = (differing(a, b), (SIZE.0 * SIZE.1) as usize);
+    assert!(n * 500 <= total, "{what}: {n} of {total} pixels differ");
+}
+
+/// Different pictures: more than stray pixels differ.
+#[track_caller]
+fn assert_differs(a: &[u8], b: &[u8], what: &str) {
+    let n = differing(a, b);
+    assert!(n >= 100, "{what}: only {n} pixels differ");
+}
+
+/// How much of a picture is the tool colour (`preview::TOOL_COLOR`, #e8542c): a red neither
+/// the default body grey nor the background has, still recognisable once a see-through body in
+/// front of it has tinted it (measured on this machine: (200, 108, 85) through a target at
+/// opacity 0.3, against (164, 173, 184) for the plain grey).
+fn tool_pixels(png: &[u8]) -> usize {
+    let (_, _, px) = decode(png);
+    px.as_chunks::<4>().0.iter().filter(|p| p[0] > 140 && p[0] > p[1].saturating_add(50) && p[0] > p[2].saturating_add(50)).count()
+}
+
+struct Scratch(PathBuf);
+
+impl Scratch {
+    fn new() -> Self {
+        let dir =
+            std::env::temp_dir().join(format!("solidcraft-snapshot-appearance-{}-{}", std::process::id(), NEXT.fetch_add(1, Ordering::Relaxed)));
+        std::fs::create_dir(&dir).unwrap();
+        Self(dir)
+    }
+
+    /// A plate with a pin standing in it: the tool body a cut would remove, reaching 6 mm short
+    /// of the far face, which is exactly what a picture is supposed to show and a volume is not.
+    /// `more` runs on top.
+    fn script(&self, name: &str, more: &[Value]) -> PathBuf {
+        let mut steps = vec![
+            json!({"command": "solid.box", "params": {"length": 50, "width": 34, "height": 20, "center": [0, 0, 10], "body_name": "Target"}}),
+            json!({"command": "solid.cylinder", "params": {"diameter": 12, "height": 14, "base": [0, 0, 0], "operation": "new_body", "body_name": "Tool"}}),
+        ];
+        steps.extend(more.iter().cloned());
+        let path = self.0.join(name);
+        std::fs::write(&path, json!({"commands": steps}).to_string()).unwrap();
+        path
+    }
+
+    fn run(&self, script: &Path, out: &str, extra: &[&str]) -> Output {
+        let (w, h) = (SIZE.0.to_string(), SIZE.1.to_string());
+        Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+            .arg("snapshot")
+            .arg(script)
+            .arg("--out")
+            .arg(self.0.join(out))
+            .args(["--width", &w, "--height", &h, "--no-grid", "--no-axes"])
+            .args(extra)
+            .output()
+            .unwrap()
+    }
+
+    /// The PNG `snapshot` writes.
+    fn snapshot(&self, script: &Path, out: &str, extra: &[&str]) -> Vec<u8> {
+        let output = self.run(script, out, extra);
+        assert!(output.status.success(), "{extra:?}: {}", String::from_utf8_lossy(&output.stderr));
+        let png = std::fs::read(self.0.join(out)).unwrap();
+        assert!(png.starts_with(b"\x89PNG"), "{extra:?}");
+        png
+    }
+}
+
+impl Drop for Scratch {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+
+/// `--body NAME:opacity=…` draws that body see-through, and the picture is the one a script
+/// gets by assigning the same appearance itself: the option is the command, not a second way
+/// of drawing.
+#[test]
+fn a_body_drawn_see_through_is_the_picture_of_the_same_appearance_assigned() {
+    let dir = Scratch::new();
+    let plain = dir.script("plain.json", &[]);
+    let assigned =
+        dir.script("assigned.json", &[json!({"command": "appearance.assign", "params": {"bodies": ["Target"], "color": "#b0bac6", "opacity": 0.3}})]);
+    let solid = dir.snapshot(&plain, "solid.png", &[]);
+    let see_through = dir.snapshot(&plain, "see-through.png", &["--body", "Target:opacity=0.3"]);
+    assert_differs(&see_through, &solid, "--body opacity was ignored");
+    assert_same(&see_through, &dir.snapshot(&assigned, "by-script.png", &[]), "the same appearance assigned by a script");
+
+    // The option's colour is the design's too. It names the target, not the tool: the tool is
+    // inside the target, so a solid target hides whatever colour the tool is given.
+    let painted =
+        dir.script("painted.json", &[json!({"command": "appearance.assign", "params": {"bodies": ["Target"], "color": "#00aa33", "opacity": 1.0}})]);
+    let by_option = dir.snapshot(&plain, "painted.png", &["--body", "Target:color=#00aa33"]);
+    assert_differs(&by_option, &solid, "--body color was ignored");
+    assert_same(&by_option, &dir.snapshot(&painted, "painted-script.png", &[]), "the same colour assigned by a script");
+}
+
+/// `--tool NAME` is the whole point: the tool solid in the tool colour, every other body
+/// see-through, so the tool shows inside the material it meets. The tool's colour covers more
+/// of the picture than it does without the option, because the target no longer hides it.
+#[test]
+fn a_tool_shows_through_the_bodies_around_it() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let plain = dir.snapshot(&script, "plain.png", &["--view", "front"]);
+    let preview = dir.snapshot(&script, "preview.png", &["--view", "front", "--tool", "Tool"]);
+    assert_differs(&preview, &plain, "--tool was ignored");
+    // Seen from the front the plate hides the pin completely; the preview shows all of it.
+    assert_eq!(tool_pixels(&plain), 0, "nothing is the tool colour before the option");
+    assert!(tool_pixels(&preview) > 200, "the tool shows through the target: {} pixels", tool_pixels(&preview));
+
+    // It is the two commands it stands for, run in that order.
+    let by_script = dir.script(
+        "by-script.json",
+        &[
+            json!({"command": "appearance.assign", "params": {"bodies": ["Target"], "color": "#b0bac6", "opacity": 0.3}}),
+            json!({"command": "appearance.assign", "params": {"bodies": ["Tool"], "color": "#e8542c", "opacity": 1.0}}),
+        ],
+    );
+    assert_same(&preview, &dir.snapshot(&by_script, "script.png", &["--view", "front"]), "the appearances --tool assigns");
+
+    // A later --body overrides what --tool said.
+    let overridden = dir.snapshot(&script, "override.png", &["--view", "front", "--tool", "Tool", "--body", "Tool:color=#2255cc"]);
+    assert!(tool_pixels(&overridden) < 50, "--body after --tool decides the tool's colour");
+}
+
+/// `--section` cuts the model where `inspect.section` would, and the same spec written as the
+/// command's own JSON, or as the command in a script, gives the same picture.
+#[test]
+fn a_section_cuts_the_model_as_inspect_section_does() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let whole = dir.snapshot(&script, "whole.png", &[]);
+    let cut = dir.snapshot(&script, "cut.png", &["--section", "z=12"]);
+    assert_differs(&cut, &whole, "--section was ignored");
+    assert_same(&cut, &dir.snapshot(&script, "cut-json.png", &["--section", r#"{"plane": "XY", "at": 12}"#]), "the command's own JSON");
+    let by_script = dir.script("sectioned.json", &[json!({"command": "inspect.section", "params": {"plane": "XY", "at": 12}})]);
+    assert_same(&cut, &dir.snapshot(&by_script, "by-script.png", &[]), "inspect.section in a script");
+
+    // The other side of the same plane is a different picture.
+    let flipped = dir.snapshot(&script, "flipped.png", &["--section", "z=12,flip"]);
+    assert_differs(&flipped, &cut, "flip keeps the other side");
+
+    // A section through a see-through target still shows the tool inside it.
+    let both = dir.snapshot(&script, "both.png", &["--section", "z=12", "--tool", "Tool"]);
+    assert_differs(&both, &cut, "--tool and --section together");
+    assert!(tool_pixels(&both) > 100, "the tool is in the cut picture");
+}
+
+/// Every way of getting the options wrong is an error that says what it takes, and writes no
+/// picture: a snapshot that quietly ignored an option would be a lie about the design.
+#[test]
+fn a_body_tool_or_section_that_cannot_be_used_is_an_error_and_writes_nothing() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let cases: [(&[&str], &str); 8] = [
+        (&["--body", "Nowhere:opacity=0.3"], "no body `Nowhere`"),
+        (&["--body", "Target"], "NAME:key=value"),
+        (&["--body", "Target:opacity=3"], "0 to 1"),
+        (&["--body", "Target:alpha=0.3"], "unknown key `alpha`"),
+        (&["--body", "Target:color=red"], "#rrggbb"),
+        (&["--tool", "Nowhere"], "no body `Nowhere`"),
+        (&["--section", "q=1"], "unknown axis `q`"),
+        (&["--section", "nonsense"], "z=27"),
+    ];
+    for (extra, expect) in cases {
+        let output = dir.run(&script, "never.png", extra);
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert_eq!(output.status.code(), Some(1), "{extra:?}: {stderr}");
+        assert!(stderr.contains(expect), "{extra:?}: {stderr}");
+        assert!(output.stdout.is_empty() && !dir.0.join("never.png").exists(), "{extra:?}");
+    }
+    // An error naming a body says which bodies the design has.
+    let stderr = String::from_utf8_lossy(&dir.run(&script, "never.png", &["--tool", "Nowhere"]).stderr).to_string();
+    assert!(stderr.contains("Target") && stderr.contains("Tool"), "{stderr}");
+}
+
+/// The usage text says what the options do.
+#[test]
+fn the_usage_names_the_body_tool_and_section_options() {
+    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("snapshot").output().unwrap();
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    for word in ["--body", "--tool", "--section", "appearance.assign", "inspect.section", "see-through"] {
+        assert!(stderr.contains(word), "usage lacks {word}: {stderr}");
+    }
+}

apps/solidcraft-cli/tests/snapshot_camera.rs

@@ -0,0 +1,412 @@
+//! `snapshot` frames its picture like the MCP `screenshot`: from a camera, a view saved in the
+//! design or one the script applies itself, and without the ground grid and the origin's axes
+//! when asked (the grid lies on Z 0 and cuts through a part that straddles it). Pictures are drawn
+//! on the GPU and compared with a tolerance; without a GPU adapter the tests that draw are skipped
+//! with the reason printed (`SOLIDCRAFT_REQUIRE_GPU=1` makes that a failure).
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Output};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use serde_json::{Value, json};
+use solidcraft_engine::Session;
+use solidcraft_mcp::{Headless, Server};
+
+static NEXT: AtomicUsize = AtomicUsize::new(0);
+
+/// Whether pictures can be drawn here; installs the renderer the CLI installs, so the MCP
+/// `screenshot` in this process draws as `solidcraft-cli mcp` does.
+fn gpu() -> bool {
+    match solidcraft_gpu::capture::shared() {
+        Ok(c) => {
+            solidcraft_engine::capture::install(std::sync::Arc::new(move |scene, cam, w, h| {
+                c.rgba(scene, cam, w, h).map(|rgba| solidcraft_engine::capture::Picture { rgba, renderer: c.renderer() }).map_err(|e| e.to_string())
+            }));
+            true
+        }
+        Err(e @ solidcraft_gpu::GpuError::NoAdapter(_)) if std::env::var_os("SOLIDCRAFT_REQUIRE_GPU").is_none() => {
+            eprintln!("skipping: {e}");
+            false
+        }
+        Err(e) => panic!("{e}"),
+    }
+}
+
+/// A PNG's size and RGBA pixels.
+fn decode(png: &[u8]) -> (u32, u32, Vec<u8>) {
+    let img = image::load_from_memory_with_format(png, image::ImageFormat::Png).unwrap().to_rgba8();
+    (img.width(), img.height(), img.into_raw())
+}
+
+/// Pixels of two same-sized pictures that differ by more than a little in some channel.
+fn differing(a: &[u8], b: &[u8]) -> usize {
+    let ((wa, ha, a), (wb, hb, b)) = (decode(a), decode(b));
+    assert_eq!((wa, ha), (wb, hb), "pictures of different sizes");
+    a.as_chunks::<4>().0.iter().zip(b.as_chunks::<4>().0).filter(|(p, q)| p.iter().zip(q.iter()).any(|(x, y)| x.abs_diff(*y) > 16)).count()
+}
+
+/// The same picture: GPU output may differ by a few levels or a stray edge pixel between drivers.
+#[track_caller]
+fn assert_same(a: &[u8], b: &[u8], what: &str) {
+    let (n, total) = (differing(a, b), (SIZE.0 * SIZE.1) as usize);
+    assert!(n * 500 <= total, "{what}: {n} of {total} pixels differ");
+}
+
+/// Different pictures: more than stray pixels differ.
+#[track_caller]
+fn assert_differs(a: &[u8], b: &[u8], what: &str) {
+    let n = differing(a, b);
+    assert!(n >= 20, "{what}: only {n} pixels differ");
+}
+
+const SIZE: (u32, u32) = (160, 100);
+
+fn camera() -> Value {
+    json!({"target": [20, 0, 0], "yaw": 0.6, "pitch": 0.25, "distance": 100})
+}
+
+struct Scratch(PathBuf);
+
+impl Scratch {
+    fn new() -> Self {
+        let dir = std::env::temp_dir().join(format!("solidcraft-snapshot-camera-{}-{}", std::process::id(), NEXT.fetch_add(1, Ordering::Relaxed)));
+        std::fs::create_dir(&dir).unwrap();
+        Self(dir)
+    }
+
+    /// A box that straddles Z 0 and keeps clear of the origin (its axes show beside it), with a view
+    /// saved in the design, plus `more` steps.
+    fn script(&self, name: &str, more: &[Value]) -> PathBuf {
+        let mut steps = vec![
+            json!({"command": "solid.box", "params": {"length": 60, "width": 40, "height": 30, "corner": [10, -20, -15]}}),
+            json!({"command": "view.save", "params": {"name": "Detail", "camera": camera()}}),
+        ];
+        steps.extend(more.iter().cloned());
+        let path = self.0.join(name);
+        std::fs::write(&path, json!({"commands": steps}).to_string()).unwrap();
+        path
+    }
+
+    fn run(&self, script: &Path, out: &str, extra: &[&str]) -> Output {
+        let (w, h) = (SIZE.0.to_string(), SIZE.1.to_string());
+        Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+            .arg("snapshot")
+            .arg(script)
+            .arg("--out")
+            .arg(self.0.join(out))
+            .args(["--width", &w, "--height", &h])
+            .args(extra)
+            .output()
+            .unwrap()
+    }
+
+    /// The PNG `snapshot` writes.
+    fn snapshot(&self, script: &Path, out: &str, extra: &[&str]) -> Vec<u8> {
+        let output = self.run(script, out, extra);
+        assert!(output.status.success(), "{extra:?}: {}", String::from_utf8_lossy(&output.stderr));
+        let png = std::fs::read(self.0.join(out)).unwrap();
+        assert!(png.starts_with(b"\x89PNG"), "{extra:?}");
+        png
+    }
+
+    /// The PNG the MCP `screenshot` tool writes for the same design.
+    fn mcp(&self, script: &Path, out: &str, arguments: Value) -> Vec<u8> {
+        let mut session = Session::default();
+        session.run_script(&serde_json::from_slice(&std::fs::read(script).unwrap()).unwrap()).unwrap();
+        let mut server = Server::new(Box::new(Headless::new(session)));
+        let mut arguments = arguments;
+        arguments["path"] = json!(self.0.join(out).to_string_lossy());
+        arguments["width"] = json!(SIZE.0);
+        arguments["height"] = json!(SIZE.1);
+        let call = json!({"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "screenshot", "arguments": arguments}});
+        let reply: Value = serde_json::from_str(&server.handle_line(&call.to_string()).unwrap()).unwrap();
+        assert!(reply.get("error").is_none() && reply["result"]["isError"] != json!(true), "{reply}");
+        std::fs::read(self.0.join(out)).unwrap()
+    }
+}
+
+impl Drop for Scratch {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.0);
+    }
+}
+
+/// The picture of `--camera` is the picture of the MCP `screenshot` with the same camera, and
+/// not the home view the option used to be ignored for.
+#[test]
+fn a_camera_frames_the_picture_as_the_mcp_screenshot_does() {
+    if !gpu() {
+        return;
+    }
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let home = dir.snapshot(&script, "home.png", &[]);
+    let json = camera().to_string();
+    let shot = dir.snapshot(&script, "camera.png", &["--camera", &json]);
+    assert_differs(&shot, &home, "--camera was ignored");
+    assert_same(&shot, &dir.mcp(&script, "mcp-camera.png", json!({"camera": camera()})), "the MCP screenshot");
+    // A perspective camera too, and a different eye gives a different picture.
+    let mut near = camera();
+    near["fov"] = json!(0.6);
+    let perspective = dir.snapshot(&script, "perspective.png", &["--camera", &near.to_string()]);
+    assert_differs(&perspective, &shot, "perspective");
+    assert_same(&perspective, &dir.mcp(&script, "mcp-perspective.png", json!({"camera": near})), "the MCP perspective screenshot");
+}
+
+/// `--view` also takes a view saved in the design, which is the camera it was saved with; a
+/// standard view still looks as it did.
+#[test]
+fn a_saved_view_is_its_camera_and_a_standard_view_is_unchanged() {
+    if !gpu() {
+        return;
+    }
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let json = camera().to_string();
+    let by_camera = dir.snapshot(&script, "camera.png", &["--camera", &json]);
+    let saved = dir.snapshot(&script, "saved.png", &["--view", "Detail"]);
+    assert_same(&saved, &by_camera, "the saved view");
+    assert_same(&saved, &dir.mcp(&script, "mcp-saved.png", json!({"view": "Detail"})), "the MCP saved view");
+    // A standard view frames the model from its direction, as before: the home camera turned.
+    let top = dir.snapshot(&script, "top.png", &["--view", "top"]);
+    let mut s = Session::default();
+    s.run_script(&serde_json::from_slice(&std::fs::read(&script).unwrap()).unwrap()).unwrap();
+    let mut cam = solidcraft_engine::view::home_camera(&s);
+    cam.set_view(solidcraft_engine::render::StandardView::Top);
+    let scene = solidcraft_engine::view::scene(&s, &cam);
+    assert_same(&top, &solidcraft_engine::capture::png(&scene, &cam, SIZE.0, SIZE.1).unwrap().bytes, "the home camera turned to the top");
+    assert_same(&top, &dir.mcp(&script, "mcp-top.png", json!({"view": "top"})), "the MCP top view");
+    assert_differs(&top, &saved, "top and the saved view");
+    let iso = dir.snapshot(&script, "iso.png", &["--view", "iso"]);
+    assert_same(&iso, &dir.snapshot(&script, "home.png", &[]), "iso is home");
+    assert_differs(&iso, &top, "iso and top");
+}
+
+/// A script that applies a view itself (as an MCP `execute` of `view.apply` does) sets the camera
+/// of its snapshot; `--view` and `--camera` still decide when given.
+#[test]
+fn a_script_can_carry_its_camera() {
+    if !gpu() {
+        return;
+    }
+    let dir = Scratch::new();
+    let script = dir.script("carried.json", &[json!({"command": "view.apply", "params": {"camera": camera()}})]);
+    let plain = dir.script("plain.json", &[]);
+    let carried = dir.snapshot(&script, "carried.png", &[]);
+    assert_same(&carried, &dir.snapshot(&plain, "by-camera.png", &["--camera", &camera().to_string()]), "the carried camera");
+    assert_differs(&carried, &dir.snapshot(&plain, "home.png", &[]), "the carried camera and home");
+    let top = dir.snapshot(&script, "top.png", &["--view", "top"]);
+    assert_same(&top, &dir.snapshot(&plain, "plain-top.png", &["--view", "top"]), "--view decides");
+}
+
+/// The grid and the axes each go when asked, and a render without both from any side shows the
+/// model alone: an empty design is then the same blank picture from every camera.
+#[test]
+fn the_grid_and_the_axes_can_be_left_out() {
+    if !gpu() {
+        return;
+    }
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let json = camera().to_string();
+    for view in [&["--view", "front"][..], &["--camera", &json][..]] {
+        let with = |extra: &[&str], out: &str| dir.snapshot(&script, out, &[view, extra].concat());
+        let (all, no_grid, no_axes, bare) = (
+            with(&[], "all.png"),
+            with(&["--no-grid"], "no-grid.png"),
+            with(&["--no-axes"], "no-axes.png"),
+            with(&["--no-grid", "--no-axes"], "bare.png"),
+        );
+        let different = [&all, &no_grid, &no_axes, &bare];
+        for (i, a) in different.iter().enumerate() {
+            for b in &different[i + 1..] {
+                assert_differs(a, b, &format!("{view:?}: two of the pictures"));
+            }
+        }
+        // The same as the MCP's `grid` and `axes`.
+        let mcp = |extra: Value, out: &str| {
+            let mut a = match view[0] {
+                "--view" => json!({"view": "front"}),
+                _ => json!({"camera": camera()}),
+            };
+            a.as_object_mut().unwrap().extend(extra.as_object().unwrap().clone());
+            dir.mcp(&script, out, a)
+        };
+        assert_same(&no_grid, &mcp(json!({"grid": false}), "mcp-no-grid.png"), "the MCP's grid: false");
+        assert_same(&no_axes, &mcp(json!({"axes": false}), "mcp-no-axes.png"), "the MCP's axes: false");
+        assert_same(&bare, &mcp(json!({"grid": false, "axes": false}), "mcp-bare.png"), "the MCP's bare picture");
+    }
+    let empty = dir.0.join("empty.json");
+    std::fs::write(&empty, json!({"commands": []}).to_string()).unwrap();
+    let blank = |view: &str, out: &str| dir.snapshot(&empty, out, &["--view", view, "--no-grid", "--no-axes"]);
+    assert_same(&blank("top", "blank-top.png"), &blank("front", "blank-front.png"), "blank from every side");
+    assert_differs(&blank("top", "blank-top.png"), &dir.snapshot(&empty, "top.png", &["--view", "top"]), "blank and the grid");
+}
+
+/// A snapshot of a box shows its silhouette where the camera puts it: the pixels that differ
+/// from an empty design's picture (same camera, no grid or axes) span the box's corners projected
+/// to pixels, within the edge and silhouette lines' width.
+#[test]
+fn a_snapshot_shows_the_part_where_the_camera_puts_it() {
+    if !gpu() {
+        return;
+    }
+    let dir = Scratch::new();
+    let part = dir.0.join("box.json");
+    let empty = dir.0.join("empty.json");
+    let corner = [10.0, -20.0, -15.0];
+    let size = [60.0, 40.0, 30.0];
+    std::fs::write(
+        &part,
+        json!({"commands": [{"command": "solid.box", "params": {"length": size[0], "width": size[1], "height": size[2], "corner": corner}}]})
+            .to_string(),
+    )
+    .unwrap();
+    std::fs::write(&empty, json!({"commands": []}).to_string()).unwrap();
+    for cam in [
+        camera(),
+        json!({"target": [40, 0, 0], "yaw": 0.0, "pitch": 0.0, "distance": 160}),
+        json!({"target": [40, 0, 0], "yaw": -0.4, "pitch": 0.5, "distance": 150, "fov": 0.6}),
+    ] {
+        let args = ["--camera", &cam.to_string(), "--no-grid", "--no-axes"];
+        let (_, _, with) = decode(&dir.snapshot(&part, "part.png", &args));
+        let (_, _, without) = decode(&dir.snapshot(&empty, "empty.png", &args));
+        // The part's pixels: where the picture differs from the empty one.
+        let (mut lo, mut hi) = ([u32::MAX; 2], [0u32; 2]);
+        for (i, (p, q)) in with.as_chunks::<4>().0.iter().zip(without.as_chunks::<4>().0).enumerate() {
+            if p.iter().zip(q.iter()).any(|(x, y)| x.abs_diff(*y) > 24) {
+                let (x, y) = (i as u32 % SIZE.0, i as u32 / SIZE.0);
+                lo = [lo[0].min(x), lo[1].min(y)];
+                hi = [hi[0].max(x), hi[1].max(y)];
+            }
+        }
+        assert!(lo[0] <= hi[0], "{cam}: the part is not in the picture");
+        // Where the camera puts the corners.
+        let mut s = solidcraft_engine::Session::default();
+        s.execute("view.apply", &json!({"camera": cam})).unwrap();
+        let c = s.camera.unwrap();
+        let vp = c.view_proj(f64::from(SIZE.0) / f64::from(SIZE.1), 1000.0);
+        let (mut elo, mut ehi) = ([f64::MAX; 2], [f64::MIN; 2]);
+        for k in 0..8 {
+            let p = solidcraft_engine::geom::Vec3::new(
+                corner[0] + size[0] * f64::from(k & 1),
+                corner[1] + size[1] * f64::from((k >> 1) & 1),
+                corner[2] + size[2] * f64::from((k >> 2) & 1),
+            );
+            let q = vp.apply(p);
+            let (x, y) = ((q[0] / q[3] + 1.0) * 0.5 * f64::from(SIZE.0), (1.0 - q[1] / q[3]) * 0.5 * f64::from(SIZE.1));
+            elo = [elo[0].min(x), elo[1].min(y)];
+            ehi = [ehi[0].max(x), ehi[1].max(y)];
+        }
+        let near = |got: u32, want: f64| (f64::from(got) - want).abs() <= 2.5;
+        assert!(
+            near(lo[0], elo[0]) && near(lo[1], elo[1]) && near(hi[0] + 1, ehi[0]) && near(hi[1] + 1, ehi[1]),
+            "{cam}: the part spans pixels {lo:?}..={hi:?}, its corners project to {elo:?}..{ehi:?}"
+        );
+    }
+}
+
+/// `snapshot` under a `SOLIDCRAFT_GPU` policy: its reply and stderr.
+fn snapshot_under(dir: &Scratch, script: &Path, out: &str, policy: &str) -> Output {
+    Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+        .env("SOLIDCRAFT_GPU", policy)
+        .arg("snapshot")
+        .arg(script)
+        .arg("--out")
+        .arg(dir.0.join(out))
+        .args(["--width", &SIZE.0.to_string(), "--height", &SIZE.1.to_string(), "--view", "top"])
+        .output()
+        .unwrap()
+}
+
+/// The last tier: `SOLIDCRAFT_GPU=cpu` draws with the CPU rasterizer whatever adapters there are,
+/// says so (`renderer: cpu` and a warning that overlays are not drawn), and the picture is the
+/// rasterizer's own.
+#[test]
+fn a_forced_cpu_snapshot_is_the_cpu_rasterizers_and_says_so() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let output = snapshot_under(&dir, &script, "cpu.png", "cpu");
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    assert!(output.status.success(), "{stderr}");
+    let reply: Value = serde_json::from_slice(&output.stdout).unwrap();
+    assert_eq!(reply["renderer"], "cpu", "{reply}");
+    assert!(reply["warning"].as_str().is_some_and(|w| w.contains("not drawn")), "{reply}");
+    assert!(stderr.contains("CPU rasterizer"), "{stderr}");
+    let mut s = Session::default();
+    s.run_script(&serde_json::from_slice(&std::fs::read(&script).unwrap()).unwrap()).unwrap();
+    let mut cam = solidcraft_engine::view::home_camera(&s);
+    cam.set_view(solidcraft_engine::render::StandardView::Top);
+    let scene = solidcraft_engine::view::scene(&s, &cam);
+    let cpu = solidcraft_engine::render::render_png(&scene, &cam, SIZE.0 as usize, SIZE.1 as usize).unwrap();
+    assert_eq!(std::fs::read(dir.0.join("cpu.png")).unwrap(), cpu);
+}
+
+/// `hardware` (and `software`) never fall to the CPU rasterizer: without such an adapter the
+/// snapshot fails, naming the policy, and writes nothing; with one it says it was drawn on the GPU.
+/// `auto` lands where `solidcraft-cli gpu` says it does.
+#[test]
+fn a_strict_policy_never_falls_to_the_cpu() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let survey = |policy: &str| {
+        let o = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(["gpu", "--policy", policy]).output().unwrap();
+        (o.status.success(), serde_json::from_slice::<Value>(&o.stdout).unwrap_or(Value::Null))
+    };
+    for policy in ["hardware", "software"] {
+        let (found, report) = survey(policy);
+        let output = snapshot_under(&dir, &script, &format!("{policy}.png"), policy);
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        if found {
+            assert!(output.status.success(), "{policy}: {stderr}");
+            let reply: Value = serde_json::from_slice(&output.stdout).unwrap();
+            assert_eq!(reply["renderer"], report["renderer"], "{policy}: {reply}");
+            assert_ne!(reply["renderer"], "cpu");
+        } else {
+            assert_eq!(report["lands_on"], Value::Null, "{policy}: {report}");
+            assert_eq!(output.status.code(), Some(1), "{policy}: {stderr}");
+            assert!(stderr.contains(&format!("`{policy}` policy")) && stderr.contains("solidcraft-cli gpu"), "{policy}: {stderr}");
+            assert!(!dir.0.join(format!("{policy}.png")).exists());
+        }
+    }
+    let (found, report) = survey("auto");
+    assert!(found, "auto always lands somewhere: {report}");
+    let output = snapshot_under(&dir, &script, "auto.png", "auto");
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    let reply: Value = serde_json::from_slice(&output.stdout).unwrap();
+    assert_eq!(reply["renderer"], report["renderer"], "{reply} vs {report}");
+    let (_, cpu) = survey("cpu");
+    assert_eq!((cpu["lands_on"].clone(), cpu["renderer"].clone()), (json!("cpu"), json!("cpu")), "{cpu}");
+}
+
+#[test]
+fn a_view_or_a_camera_that_cannot_be_used_is_an_error_and_writes_nothing() {
+    let dir = Scratch::new();
+    let script = dir.script("part.json", &[]);
+    let cases: [(&[&str], &str); 7] = [
+        (&["--view", "Nowhere"], "Nowhere"),
+        (&["--view", "iso", "--camera", "{}"], "not both"),
+        (&["--camera", "not json"], "--camera"),
+        (&["--camera", "{\"target\": [0, 0, 0]}"], "yaw"),
+        (&["--camera", "{\"target\": [0, 0, 0], \"yaw\": 0, \"pitch\": 0, \"distance\": 0}"], "distance"),
+        (&["--camera", "{\"target\": [0, 0, 0], \"yaw\": 0, \"pitch\": 0, \"distance\": 50, \"fov\": -1}"], "camera"),
+        (&["--camera", "[1, 2, 3]"], "camera"),
+    ];
+    for (extra, expect) in cases {
+        let output = dir.run(&script, "never.png", extra);
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert_eq!(output.status.code(), Some(1), "{extra:?}: {stderr}");
+        assert!(stderr.contains(expect), "{extra:?}: {stderr}");
+        assert!(output.stdout.is_empty() && !dir.0.join("never.png").exists(), "{extra:?}");
+    }
+}
+
+/// The usage text says what the new options do.
+#[test]
+fn the_usage_names_the_camera_and_the_guides() {
+    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("snapshot").output().unwrap();
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    for word in ["--camera", "--view", "view.save", "--no-grid", "--no-axes"] {
+        assert!(stderr.contains(word), "usage lacks {word}: {stderr}");
+    }
+}

apps/solidcraft-cli/tests/straight_edges_after_cuts.rs

@@ -0,0 +1,88 @@
+//! Straight edges stay one edge after many cuts (#1049). The owner's design
+//! (`tests/action_matrix/designs/crazy-geom-cuts.solidcraft`, saved by 0.10.0): five extrudes,
+//! joins and cuts, over four sketches, three of them on faces of the body with the faces'
+//! edges projected. Cuts used to leave the straight edges of the walls they sliced split at
+//! vertices nothing else used, so an edge that is one straight line was drawn (and lit on hover)
+//! as many pieces, and a sketch on such a face projected every piece.
+
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+
+use serde_json::json;
+use solidcraft_engine::Session;
+use solidcraft_engine::doc::kernel::{FaceSurface, face_surface};
+use solidcraft_engine::geom::Vec3;
+
+fn design() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("../../tests/action_matrix/designs/crazy-geom-cuts.solidcraft")
+}
+
+fn open(path: &Path) -> Session {
+    let mut s = Session::default();
+    s.execute("doc.open", &json!({"path": path.to_string_lossy()})).unwrap_or_else(|e| panic!("{}: {e}", path.display()));
+    s
+}
+
+/// The design built from scratch: saved without cached geometry and opened again.
+fn rebuilt() -> Session {
+    let s = open(&design());
+    let dir = std::env::temp_dir().join(format!("solidcraft-straight-edges-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let path = dir.join("crazy-geom-cuts.json");
+    let mut t = s.scratch();
+    t.execute("file.save", &json!({"path": path.to_string_lossy(), "format": "json"})).unwrap();
+    let out = open(&path);
+    let _ = std::fs::remove_dir_all(&dir);
+    out
+}
+
+fn errors(s: &Session) -> Vec<(u64, String)> {
+    s.model.results.iter().filter_map(|r| r.error.clone().map(|e| (r.id, e))).collect()
+}
+
+fn key(v: Vec3) -> [i64; 3] {
+    [v.x, v.y, v.z].map(|c| (c * 1e5).round() as i64)
+}
+
+#[test]
+fn straight_edges_are_one_edge_after_many_cuts() {
+    for (what, s) in [("as saved", open(&design())), ("built from scratch", rebuilt())] {
+        assert_eq!(errors(&s), vec![], "{what}: every feature evaluates");
+        let st = s.world_state();
+        let bodies: Vec<_> = st.bodies.iter().filter(|b| !b.body.is_mesh()).collect();
+        assert_eq!(bodies.len(), 1, "{what}: one body");
+        let body = &bodies[0].body;
+        let mesh = body.tessellate(0.01).unwrap();
+        // Every edge is drawn as one polyline; a straight one as one segment.
+        let mut at: HashMap<[i64; 3], Vec<usize>> = HashMap::new();
+        for (i, e) in mesh.edges.iter().enumerate() {
+            let (Some(a), Some(z)) = (e.first(), e.last()) else { panic!("{what}: edge {i} is empty") };
+            at.entry(key(*a)).or_default().push(i);
+            at.entry(key(*z)).or_default().push(i);
+        }
+        let straight = |i: usize| mesh.edges.get(i).filter(|e| e.len() == 2).and_then(|e| (e[1] - e[0]).normalized());
+        let split: Vec<_> = at
+            .iter()
+            .filter(|(_, es)| match es.as_slice() {
+                [a, b] => straight(*a).zip(straight(*b)).is_some_and(|(u, w)| u.dot(w).abs() > 1. - 1e-9),
+                _ => false,
+            })
+            .map(|(k, _)| k.map(|c| c as f64 / 1e5))
+            .collect();
+        assert_eq!(split, Vec::<[f64; 3]>::new(), "{what}: straight edges split where nothing else meets them");
+        // No two faces side by side in one plane.
+        let plane = |f: usize| match face_surface(body, f) {
+            Some(FaceSurface::Plane { normal, point }) => Some((normal, normal.dot(point))),
+            _ => None,
+        };
+        for (i, faces) in mesh.edge_faces.iter().enumerate() {
+            if let [a, b] = faces.as_slice()
+                && a != b
+                && let (Some((na, da)), Some((nb, db))) = (plane(*a as usize), plane(*b as usize))
+            {
+                assert!(na.dot(nb) < 1. - 1e-9 || (da - db).abs() > 1e-6, "{what}: faces {a} and {b} meet at edge {i} in one plane");
+            }
+        }
+        assert_eq!((body.face_count(), body.edge_count(), body.vertex_count()), (35, 107, 71), "{what}: faces, edges and vertices");
+    }
+}

apps/solidcraft-web/Cargo.toml

@@ -29,5 +29,6 @@ web-sys = { version = "0.3", features = [
     "Window", "Document", "Element", "HtmlElement", "HtmlCanvasElement", "Location", "Navigator", "StorageManager",
     "FileSystemHandle", "FileSystemDirectoryHandle", "FileSystemFileHandle", "FileSystemGetFileOptions", "FileSystemWritableFileStream",
     "WritableStream", "File", "FileList", "Blob", "BlobPropertyBag", "Url", "HtmlAnchorElement", "HtmlInputElement", "Storage",
-    "BeforeUnloadEvent", "Event", "EventTarget", "Response",
+    "IdbFactory", "IdbDatabase", "IdbObjectStore", "IdbOpenDbRequest", "IdbRequest", "IdbTransaction", "IdbTransactionMode",
+    "BeforeUnloadEvent", "Event", "EventTarget", "Response", "MediaQueryList", "Gamepad", "Performance",
 ] }

apps/solidcraft-web/Trunk.toml

@@ -8,3 +8,9 @@ filehash = true
 [serve]
 addresses = ["127.0.0.1"]
 port = 8781
+
+# Offline use and updates: release builds get sw.js listing this build's files (xtask/src/web_offline.rs).
+[[hooks]]
+stage = "post_build"
+command = "cargo"
+command_arguments = ["xtask", "web-offline"]

apps/solidcraft-web/index.html

@@ -4,18 +4,48 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
   <title>SolidCraft</title>
+  <meta name="description" content="Open-source parametric CAD built in Rust. Desktop, browser, and MCP for AI agents.">
+  <meta property="og:type" content="website">
+  <meta property="og:site_name" content="SolidCraft">
+  <meta property="og:title" content="SolidCraft: try it in your browser">
+  <meta property="og:description" content="Open-source parametric CAD built in Rust. Desktop, browser, and MCP for AI agents.">
+  <meta property="og:url" content="https://solidcraft.ai/">
+  <meta property="og:image" content="https://docs.solidcraft.io/og.png">
+  <meta property="og:image:width" content="1280">
+  <meta property="og:image:height" content="640">
+  <meta property="og:image:alt" content="SolidCraft: open-source parametric CAD built in Rust">
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:title" content="SolidCraft: try it in your browser">
+  <meta name="twitter:description" content="Open-source parametric CAD built in Rust. Desktop, browser, and MCP for AI agents.">
+  <meta name="twitter:image" content="https://docs.solidcraft.io/og.png">
+  <meta name="twitter:image:alt" content="SolidCraft: open-source parametric CAD built in Rust">
   <link data-trunk rel="rust" data-bin="solidcraft-web" data-wasm-opt="z" data-weak-refs />
-  <link data-trunk rel="copy-file" href="fonts/BIZUDPGothic-Regular.ttf" data-target-path="fonts" />
-  <link data-trunk rel="copy-file" href="fonts/OFL.txt" data-target-path="fonts" />
-  <style>
-    html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: #e8ebf0; }
-    #solidcraft_canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
-    #solidcraft_loading { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
-      color: #4a5060; font: 14px system-ui, sans-serif; pointer-events: none; }
-  </style>
+  <link data-trunk rel="copy-file" href="../../assets/fonts/biz-udp-gothic/BIZUDPGothic-Regular.ttf" data-target-path="fonts" />
+  <link data-trunk rel="copy-file" href="../../assets/fonts/biz-udp-gothic/OFL.txt" data-target-path="fonts" />
+  <link data-trunk rel="css" href="../../assets/styles/web/loading.css" />
+  <link data-trunk rel="copy-file" href="../../assets/styles/web/loading-logo.svg" />
+  <!-- Installable as an app (manifest.webmanifest); the icons are the Linux exports of the app mark. -->
+  <meta name="theme-color" content="#343840">
+  <link rel="manifest" href="manifest.webmanifest">
+  <link rel="icon" type="image/png" sizes="32x32" href="icons/32x32/ai.storyteller.solidcraft.png">
+  <link rel="apple-touch-icon" href="icons/256x256/ai.storyteller.solidcraft.png">
+  <link data-trunk rel="copy-file" href="manifest.webmanifest" />
+  <link data-trunk rel="copy-file" href="../../assets/icons/app/linux/exports/hicolor/32x32/apps/ai.storyteller.solidcraft.png" data-target-path="icons/32x32" />
+  <link data-trunk rel="copy-file" href="../../assets/icons/app/linux/exports/hicolor/256x256/apps/ai.storyteller.solidcraft.png" data-target-path="icons/256x256" />
+  <link data-trunk rel="copy-file" href="../../assets/icons/app/linux/exports/hicolor/512x512/apps/ai.storyteller.solidcraft.png" data-target-path="icons/512x512" />
 </head>
 <body>
   <canvas id="solidcraft_canvas"></canvas>
-  <div id="solidcraft_loading">Loading SolidCraft&hellip;</div>
+  <div id="solidcraft_loading" role="status"><img src="loading-logo.svg" alt=""><span class="sr-only">Loading SolidCraft&hellip;</span></div>
+  <script>
+    // Offline use and updates (sw.js; written into release builds by `cargo xtask web-offline`).
+    if ("serviceWorker" in navigator) {
+      addEventListener("load", () => navigator.serviceWorker.register("sw.js").catch(() => {}));
+    }
+    // Install as an app: the browser's offer can come before the app runs, so it is kept here for
+    // the app's File ▸ Install app… item (src/install.rs). Installed, the browser makes no more offers.
+    addEventListener("beforeinstallprompt", (e) => { e.preventDefault(); window.solidcraftInstall = e; });
+    addEventListener("appinstalled", () => { window.solidcraftInstall = null; });
+  </script>
 </body>
 </html>

apps/solidcraft-web/manifest.webmanifest

@@ -0,0 +1,16 @@
+{
+  "name": "SolidCraft",
+  "short_name": "SolidCraft",
+  "description": "Open-source parametric CAD built in Rust.",
+  "start_url": "./",
+  "scope": "./",
+  "display": "standalone",
+  "background_color": "#e8ebf0",
+  "theme_color": "#343840",
+  "categories": ["productivity", "utilities"],
+  "icons": [
+    { "src": "icons/32x32/ai.storyteller.solidcraft.png", "sizes": "32x32", "type": "image/png" },
+    { "src": "icons/256x256/ai.storyteller.solidcraft.png", "sizes": "256x256", "type": "image/png" },
+    { "src": "icons/512x512/ai.storyteller.solidcraft.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}

apps/solidcraft-web/src/api.rs

@@ -0,0 +1,131 @@
+//! Promise-based access to the running app's existing control channel.
+
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::sync::mpsc::{Receiver, Sender, TryRecvError};
+use std::time::Duration;
+
+use serde_json::{Value, json};
+use solidcraft_ui_egui::ControlRequest;
+use wasm_bindgen::{JsValue, closure::Closure};
+
+const MAX_PENDING: usize = 256;
+const MAX_JSON_BYTES: usize = 16 * 1024 * 1024;
+
+struct Pending {
+    reply: Receiver<Value>,
+    resolve: js_sys::Function,
+    reject: js_sys::Function,
+}
+
+#[derive(Clone)]
+pub struct Api {
+    sender: Sender<ControlRequest>,
+    pending: Rc<RefCell<Vec<Pending>>>,
+    ctx: egui::Context,
+}
+
+fn params(value: &JsValue) -> Result<Value, String> {
+    if value.is_undefined() || value.is_null() {
+        return Ok(json!({}));
+    }
+    let text = js_sys::JSON::stringify(value).ok().and_then(|v| v.as_string()).ok_or("params must be JSON serializable")?;
+    if text.len() > MAX_JSON_BYTES {
+        return Err("params exceed 16 MiB".into());
+    }
+    serde_json::from_str(&text).map_err(|e| format!("invalid params: {e}"))
+}
+
+fn error(message: &str) -> JsValue {
+    js_sys::Error::new(message).into()
+}
+
+impl Api {
+    pub fn install(sender: Sender<ControlRequest>, ctx: egui::Context) -> Result<Self, JsValue> {
+        let api = Self { sender, pending: Rc::default(), ctx };
+        let object = js_sys::Object::new();
+        let request = api.clone();
+        let execute = api.clone();
+        let commands = api.clone();
+        let inspect = api.clone();
+        for (name, function) in [
+            (
+                "request",
+                Closure::<dyn Fn(String, JsValue) -> js_sys::Promise>::new(move |method: String, value: JsValue| {
+                    request.request(&method, params(&value))
+                })
+                .into_js_value(),
+            ),
+            (
+                "execute",
+                Closure::<dyn Fn(String, JsValue) -> js_sys::Promise>::new(move |command: String, value: JsValue| {
+                    execute.request("engine.execute", params(&value).map(|p| json!({"command": command, "params": p})))
+                })
+                .into_js_value(),
+            ),
+            ("commands", Closure::<dyn Fn() -> js_sys::Promise>::new(move || commands.request("engine.commands", Ok(json!({})))).into_js_value()),
+            (
+                "inspect",
+                Closure::<dyn Fn(JsValue) -> js_sys::Promise>::new(move |value: JsValue| inspect.request("document.inspect", params(&value)))
+                    .into_js_value(),
+            ),
+        ] {
+            js_sys::Reflect::set(&object, &name.into(), &function)?;
+        }
+        let window = web_sys::window().ok_or_else(|| error("no window"))?;
+        js_sys::Reflect::set(&window, &"solidcraft".into(), &object)?;
+        Ok(api)
+    }
+
+    fn request(&self, method: &str, params: Result<Value, String>) -> js_sys::Promise {
+        let params = match params {
+            Ok(params) => params,
+            Err(message) => return js_sys::Promise::reject(&error(&message)),
+        };
+        if self.pending.borrow().len() >= MAX_PENDING {
+            return js_sys::Promise::reject(&error("too many pending SolidCraft requests (maximum 256)"));
+        }
+        js_sys::Promise::new(&mut |resolve, reject| {
+            let (request, reply) = ControlRequest::new(method, params.clone());
+            if self.sender.send(request).is_err() {
+                let _ = reject.call1(&JsValue::UNDEFINED, &error("SolidCraft is not running"));
+                return;
+            }
+            self.pending.borrow_mut().push(Pending { reply, resolve, reject });
+            self.ctx.request_repaint();
+        })
+    }
+
+    pub fn poll(&self) {
+        let mut completed = Vec::new();
+        self.pending.borrow_mut().retain_mut(|pending| {
+            let result = match pending.reply.try_recv() {
+                Ok(reply) => {
+                    if reply.get("ok").and_then(Value::as_bool) == Some(true) {
+                        js_sys::JSON::parse(&reply.get("result").unwrap_or(&Value::Null).to_string())
+                    } else {
+                        Err(error(reply.get("error").and_then(Value::as_str).unwrap_or("SolidCraft request failed")))
+                    }
+                }
+                Err(TryRecvError::Empty) => return true,
+                Err(TryRecvError::Disconnected) => Err(error("SolidCraft request dropped")),
+            };
+            completed.push((pending.resolve.clone(), pending.reject.clone(), result));
+            false
+        });
+        // Release the queue before calling JavaScript, which can submit another request.
+        for (resolve, reject, result) in completed {
+            match result {
+                Ok(value) => {
+                    let _ = resolve.call1(&JsValue::UNDEFINED, &value);
+                }
+                Err(error) => {
+                    let _ = reject.call1(&JsValue::UNDEFINED, &error);
+                }
+            }
+        }
+        if !self.pending.borrow().is_empty() {
+            self.ctx.request_repaint_after(Duration::from_millis(16));
+        }
+    }
+}

apps/solidcraft-web/src/disk.rs

@@ -0,0 +1,497 @@
+//! Designs on the computer's own disk, through the File System Access API (Chrome, Edge, Opera):
+//! Save As and Open show the browser's file dialogs, and the chosen file's handle is kept (in
+//! memory, and in IndexedDB so Save still reaches the file after a reload) so Save writes back to
+//! it. To the engine such a design is the file `/disk/<id>/<name>`: it saves there like anywhere,
+//! and [`flush`](crate::files::flush) forwards what it wrote to the handle. Browsers without the
+//! API (Firefox, Safari) keep designs in the origin private file system (`files.rs`).
+//!
+//! The path logic is plain Rust and tested natively; the browser calls are wasm-only.
+#![cfg_attr(not(target_arch = "wasm32"), allow(dead_code))]
+
+/// Where a design on the computer's disk appears to the engine.
+pub const PREFIX: &str = "/disk/";
+
+/// Where designs kept in the browser's private storage (OPFS) appear to the engine.
+pub const OPFS_PREFIX: &str = "/opfs/";
+/// Paths written here are handed to the user as downloads.
+pub const DOWNLOADS_PREFIX: &str = "/downloads/";
+
+/// Where what a command wrote to an engine path goes.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum WriteTo {
+    /// The browser's private storage: the design (or recovery file) keeps its name there.
+    Opfs,
+    /// A file on the computer, through its handle.
+    Disk,
+    /// A download.
+    Download,
+    /// Kept only in memory (uploads).
+    Memory,
+}
+
+/// Route a write by its path. OPFS paths always go to OPFS, whatever the browser can do: a design
+/// opened from the browser's storage keeps saving there until the user picks Save As.
+pub fn route(path: &str) -> WriteTo {
+    if path.starts_with(OPFS_PREFIX) {
+        WriteTo::Opfs
+    } else if parse(path).is_some() {
+        WriteTo::Disk
+    } else if path.starts_with(DOWNLOADS_PREFIX) {
+        WriteTo::Download
+    } else {
+        WriteTo::Memory
+    }
+}
+
+/// The engine path of the design `name` kept under handle `id`.
+pub fn path(id: &str, name: &str) -> String {
+    format!("{PREFIX}{id}/{name}")
+}
+
+/// The handle id and file name of an engine path made by [`path`].
+pub fn parse(path: &str) -> Option<(&str, &str)> {
+    let (id, name) = path.strip_prefix(PREFIX)?.split_once('/')?;
+    (!id.is_empty() && !name.is_empty() && !name.contains('/')).then_some((id, name))
+}
+
+/// A handle id from the time and a random number.
+pub fn make_id(ms: u64, random: u64) -> String {
+    format!("{ms:x}-{random:x}")
+}
+
+/// Where a design saved with Save As goes.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum SaveTarget {
+    /// A file the user picks on their computer.
+    Disk,
+    /// The browser's private storage (OPFS): what browsers without the API have always done.
+    Browser,
+    /// Not a design (an export): handed over as a download.
+    Download,
+}
+
+/// Choose where a Save As goes: designs to the disk when the browser can pick a file, else into
+/// the browser's storage; anything else is a download.
+pub fn save_target(api: bool, design: bool) -> SaveTarget {
+    match (design, api) {
+        (false, _) => SaveTarget::Download,
+        (true, true) => SaveTarget::Disk,
+        (true, false) => SaveTarget::Browser,
+    }
+}
+
+/// Does a picker for `extensions` (what the command reads; `&[]`: anything) belong to a design?
+/// Only those go through the disk dialog; inserting a STEP or mesh keeps using the file window.
+pub fn opens_design(extensions: &[&str]) -> bool {
+    extensions.is_empty() || extensions.iter().any(|e| solidcraft_engine::io::DESIGN_EXTS.contains(e))
+}
+
+/// The file type a Save As dialog offers for `name`: (description, MIME type, extension).
+pub fn save_type(name: &str) -> (&'static str, &'static str, &'static str) {
+    let json = std::path::Path::new(name).extension().is_some_and(|e| e.eq_ignore_ascii_case("json"));
+    if json { ("Plain JSON design", "application/json", ".json") } else { ("SolidCraft design", "application/octet-stream", ".solidcraft") }
+}
+
+/// Is this a cancelled dialog (the browser's `AbortError`)? Not an error to show.
+pub fn is_abort(error_name: &str) -> bool {
+    error_name == "AbortError"
+}
+
+#[cfg(target_arch = "wasm32")]
+pub use web::*;
+
+#[cfg(target_arch = "wasm32")]
+mod web {
+    use std::cell::{Cell, RefCell};
+    use std::collections::{HashMap, VecDeque};
+    use std::rc::Rc;
+
+    use js_sys::{Array, Function, Object, Promise, Reflect};
+    use solidcraft_engine::io::vfs;
+    use wasm_bindgen::{JsCast as _, JsValue, closure::Closure};
+    use wasm_bindgen_futures::{JsFuture, spawn_local};
+    use web_sys::{FileSystemFileHandle, IdbDatabase, IdbObjectStore, IdbOpenDbRequest, IdbRequest, IdbTransactionMode};
+
+    use super::{is_abort, make_id, opens_design, parse, path, save_type};
+    use crate::files::{Files, err, read_handle};
+
+    const DB: &str = "solidcraft-disk-handles";
+    const STORE: &str = "handles";
+
+    thread_local! {
+        /// Handles picked or looked up in this session, by id.
+        static HANDLES: RefCell<HashMap<String, FileSystemFileHandle>> = RefCell::new(HashMap::new());
+        /// Writes waiting for their turn (a file takes one writer at a time), latest per id.
+        static QUEUE: RefCell<VecDeque<(String, Vec<u8>)>> = const { RefCell::new(VecDeque::new()) };
+        static BUSY: Cell<bool> = const { Cell::new(false) };
+    }
+
+    /// Why a dialog gave no file.
+    enum Pick {
+        Cancelled,
+        Failed(String),
+    }
+
+    fn failed(e: JsValue) -> Pick {
+        let name = Reflect::get(&e, &"name".into()).ok().and_then(|n| n.as_string()).unwrap_or_default();
+        if is_abort(&name) { Pick::Cancelled } else { Pick::Failed(err(e)) }
+    }
+
+    /// Can this page show the browser's file dialogs and write to the files they pick?
+    pub fn supported() -> bool {
+        let Some(window) = web_sys::window() else { return false };
+        let has = |name: &str| Reflect::get(&window, &name.into()).is_ok_and(|f| f.is_function());
+        window.is_secure_context() && has("showSaveFilePicker") && has("showOpenFilePicker")
+    }
+
+    fn types(description: &str, mime: &str, extension: &str) -> Array {
+        let accept = Object::new();
+        let _ = Reflect::set(&accept, &mime.into(), &Array::of1(&extension.into()));
+        let entry = Object::new();
+        let _ = Reflect::set(&entry, &"description".into(), &description.into());
+        let _ = Reflect::set(&entry, &"accept".into(), &accept);
+        Array::of1(&entry)
+    }
+
+    /// Start a dialog. This must run in the click that asked for it (the browser wants a user
+    /// gesture), so it is called before anything is awaited.
+    fn start_picker(function: &str, options: &Object) -> Result<Promise, Pick> {
+        let window = web_sys::window().ok_or_else(|| Pick::Failed("no window".into()))?;
+        let f: Function = Reflect::get(&window, &function.into())
+            .map_err(failed)?
+            .dyn_into()
+            .map_err(|_| Pick::Failed("this browser can't open file dialogs".into()))?;
+        f.call1(&window, options).map_err(failed)?.dyn_into().map_err(|_| Pick::Failed("no answer from the file dialog".into()))
+    }
+
+    /// Remember a picked file: in memory now, in IndexedDB for the next session.
+    fn register(handle: &FileSystemFileHandle) -> String {
+        let id = make_id(js_sys::Date::now() as u64, (js_sys::Math::random() * 1e15) as u64);
+        HANDLES.with(|h| h.borrow_mut().insert(id.clone(), handle.clone()));
+        let (key, kept, name) = (id.clone(), handle.clone(), handle.name());
+        spawn_local(async move {
+            if let Err(e) = remember(&key, &kept).await {
+                log::warn!("the file's handle isn't kept for the next session: {e}");
+            }
+        });
+        path(&id, &name)
+    }
+
+    fn save_options(name: &str) -> Object {
+        let options = Object::new();
+        let _ = Reflect::set(&options, &"suggestedName".into(), &name.into());
+        let (description, mime, extension) = save_type(name);
+        let _ = Reflect::set(&options, &"types".into(), &types(description, mime, extension));
+        options
+    }
+
+    /// "Save to computer…" for a design kept in the browser: write a copy of `bytes` to a file the
+    /// user picks (call in the click), or download it where the browser can't pick one. The design
+    /// itself stays where it is.
+    pub fn save_copy(files: &Rc<Files>, name: &str, bytes: Vec<u8>) {
+        if !supported() {
+            if let Err(e) = crate::files::download(name, &bytes) {
+                files.say(format!("{name}: {e}"), true);
+            }
+            return;
+        }
+        let promise = start_picker("showSaveFilePicker", &save_options(name));
+        let files = files.clone();
+        spawn_local(async move {
+            let r = async {
+                let h: FileSystemFileHandle =
+                    JsFuture::from(promise?).await.map_err(failed)?.dyn_into().map_err(|_| Pick::Failed("not a file".into()))?;
+                write_handle(&h, &bytes).await.map_err(Pick::Failed)?;
+                Ok::<String, Pick>(h.name())
+            };
+            match r.await {
+                Ok(saved) => files.say(format!("Saved a copy to {saved}"), false),
+                Err(Pick::Cancelled) => {}
+                Err(Pick::Failed(e)) => files.say(format!("save to computer: {e}"), true),
+            }
+        });
+    }
+
+    /// Save As, step one: show the browser's save dialog (call in the click). The answer is the
+    /// engine path the design is saved to, `None` when the dialog was closed.
+    pub fn pick_save(files: &Rc<Files>, name: &str) -> impl std::future::Future<Output = Option<String>> + use<> {
+        let promise = start_picker("showSaveFilePicker", &save_options(name));
+        let files = files.clone();
+        async move {
+            let handle = match promise {
+                Ok(p) => JsFuture::from(p)
+                    .await
+                    .map_err(failed)
+                    .and_then(|h| h.dyn_into::<FileSystemFileHandle>().map_err(|_| Pick::Failed("not a file".into()))),
+                Err(e) => Err(e),
+            };
+            match handle {
+                Ok(h) => Some(register(&h)),
+                Err(Pick::Cancelled) => None,
+                Err(Pick::Failed(e)) => {
+                    files.say(format!("save: {e}"), true);
+                    None
+                }
+            }
+        }
+    }
+
+    /// Open, step one: show the browser's open dialog for a design (call in the click). The
+    /// answer is the engine path of the file, read into the engine's files; a design keeps its
+    /// handle, so Save writes back to the file. `None`: closed, or it could not be read.
+    pub fn pick_open(files: &Rc<Files>) -> impl std::future::Future<Output = Option<String>> + use<> {
+        let promise = start_picker("showOpenFilePicker", &open_options());
+        let files = files.clone();
+        async move {
+            let r = async {
+                let p = promise?;
+                let handles: Array = JsFuture::from(p).await.map_err(failed)?.dyn_into().map_err(|_| Pick::Failed("no file".into()))?;
+                let h: FileSystemFileHandle = handles.get(0).dyn_into().map_err(|_| Pick::Cancelled)?;
+                let bytes = read_handle(&h).await.map_err(Pick::Failed)?;
+                Ok((h, bytes))
+            };
+            match r.await {
+                Ok((h, bytes)) => Some(arrive(&h, bytes)),
+                Err(Pick::Cancelled) => None,
+                Err(Pick::Failed(e)) => {
+                    files.say(format!("open: {e}"), true);
+                    None
+                }
+            }
+        }
+    }
+
+    /// The options of the open dialog: a single file, designs and CAD files listed first.
+    pub fn open_options() -> Object {
+        let options = Object::new();
+        let _ = Reflect::set(&options, &"multiple".into(), &JsValue::FALSE);
+        let extensions = Array::new();
+        for e in [".solidcraft", ".solvecraft", ".json", ".step", ".stp", ".3mf", ".stl", ".obj", ".glb", ".gltf"] {
+            extensions.push(&e.into());
+        }
+        let accept = Object::new();
+        let _ = Reflect::set(&accept, &"application/octet-stream".into(), &extensions);
+        let entry = Object::new();
+        let _ = Reflect::set(&entry, &"description".into(), &"Designs and CAD files".into());
+        let _ = Reflect::set(&entry, &"accept".into(), &accept);
+        let _ = Reflect::set(&options, &"types".into(), &Array::of1(&entry));
+        options
+    }
+
+    /// A file read from a dialog's handle: a design lives at its disk path from now on (and
+    /// keeps the handle); anything else is an upload to open or insert.
+    pub fn arrive(handle: &FileSystemFileHandle, bytes: Vec<u8>) -> String {
+        let name = handle.name();
+        let p = if solidcraft_engine::io::is_design_path(&name) { register(handle) } else { format!("{}{name}", crate::files::UPLOAD) };
+        vfs::insert(&p, bytes);
+        p
+    }
+
+    /// Does an Open for `extensions` use the browser's open dialog?
+    pub fn handles_open(extensions: &[&str]) -> bool {
+        supported() && opens_design(extensions)
+    }
+
+    // ---- writing ------------------------------------------------------------------------
+
+    /// Queue what a command wrote to a disk path. Writes go one at a time; a newer write of the
+    /// same file replaces one still waiting.
+    pub fn enqueue(files: &Rc<Files>, path: &str, bytes: Vec<u8>) {
+        QUEUE.with(|q| {
+            let mut q = q.borrow_mut();
+            q.retain(|(p, _)| p != path);
+            q.push_back((path.to_string(), bytes));
+        });
+        if BUSY.with(|b| b.replace(true)) {
+            return;
+        }
+        let files = files.clone();
+        spawn_local(async move {
+            while let Some((path, bytes)) = QUEUE.with(|q| q.borrow_mut().pop_front()) {
+                if let Err(e) = write(&path, &bytes).await {
+                    files.failed_disk(&path, &e);
+                }
+            }
+            BUSY.with(|b| b.set(false));
+        });
+    }
+
+    async fn write(path: &str, bytes: &[u8]) -> Result<(), String> {
+        let (id, name) = parse(path).ok_or("not a file on the computer")?;
+        let handle = handle_for(id).await.map_err(|e| format!("{name}: {e}"))?;
+        write_handle(&handle, bytes).await.map_err(|e| format!("{name}: {e}"))
+    }
+
+    async fn write_handle(handle: &FileSystemFileHandle, bytes: &[u8]) -> Result<(), String> {
+        ensure_readwrite(handle).await?;
+        let w: web_sys::FileSystemWritableFileStream =
+            JsFuture::from(handle.create_writable()).await.map_err(err)?.dyn_into().map_err(|_| "no writable stream".to_string())?;
+        JsFuture::from(w.write_with_u8_array(bytes).map_err(err)?).await.map_err(err)?;
+        JsFuture::from(w.close()).await.map_err(err)?;
+        Ok(())
+    }
+
+    async fn handle_for(id: &str) -> Result<FileSystemFileHandle, String> {
+        if let Some(h) = HANDLES.with(|h| h.borrow().get(id).cloned()) {
+            return Ok(h);
+        }
+        let h: FileSystemFileHandle = recall(id)
+            .await?
+            .and_then(|v| v.dyn_into().ok())
+            .ok_or("the browser no longer remembers where this design was saved: use Save As to choose the file again")?;
+        HANDLES.with(|m| m.borrow_mut().insert(id.to_string(), h.clone()));
+        Ok(h)
+    }
+
+    /// Ask for write access if the browser doesn't hold it any more (after a reload): one prompt,
+    /// from the click that asked for the save.
+    async fn ensure_readwrite(handle: &FileSystemFileHandle) -> Result<(), String> {
+        let options = Object::new();
+        let _ = Reflect::set(&options, &"mode".into(), &"readwrite".into());
+        for method in ["queryPermission", "requestPermission"] {
+            let Some(f) = Reflect::get(handle, &method.into()).ok().and_then(|f| f.dyn_into::<Function>().ok()) else {
+                // A browser without the permission calls hands out writable handles as they are.
+                return Ok(());
+            };
+            let answer = f.call1(handle, &options).map_err(err)?;
+            let state = JsFuture::from(Promise::resolve(&answer)).await.map_err(err)?;
+            if state.as_string().as_deref() == Some("granted") {
+                return Ok(());
+            }
+        }
+        Err("the browser wasn't given permission to write the file: use Save As to choose it again".into())
+    }
+
+    // ---- IndexedDB: the handles, by id --------------------------------------------------
+
+    /// The result of an IndexedDB request.
+    async fn result(req: &IdbRequest) -> Result<JsValue, String> {
+        let promise = Promise::new(&mut |resolve, reject| {
+            let r = req.clone();
+            let ok = Closure::once_into_js(move || {
+                let _ = resolve.call1(&JsValue::NULL, &r.result().unwrap_or(JsValue::UNDEFINED));
+            });
+            let bad = Closure::once_into_js(move || {
+                let _ = reject.call1(&JsValue::NULL, &"IndexedDB failed".into());
+            });
+            req.set_onsuccess(Some(ok.unchecked_ref()));
+            req.set_onerror(Some(bad.unchecked_ref()));
+        });
+        JsFuture::from(promise).await.map_err(err)
+    }
+
+    async fn open_db() -> Result<IdbDatabase, String> {
+        let factory = web_sys::window().ok_or("no window")?.indexed_db().map_err(err)?.ok_or("this browser has no IndexedDB")?;
+        let request: IdbOpenDbRequest = factory.open_with_u32(DB, 1).map_err(err)?;
+        let target = request.clone();
+        let upgrade = Closure::once_into_js(move || {
+            if let Ok(db) = target.result().and_then(|r| r.dyn_into::<IdbDatabase>()) {
+                let _ = db.create_object_store(STORE);
+            }
+        });
+        request.set_onupgradeneeded(Some(upgrade.unchecked_ref()));
+        result(&request).await?.dyn_into().map_err(|_| "no database".to_string())
+    }
+
+    fn store(db: &IdbDatabase, mode: IdbTransactionMode) -> Result<IdbObjectStore, String> {
+        db.transaction_with_str_and_mode(STORE, mode).map_err(err)?.object_store(STORE).map_err(err)
+    }
+
+    async fn remember(id: &str, handle: &FileSystemFileHandle) -> Result<(), String> {
+        let db = open_db().await?;
+        let req = store(&db, IdbTransactionMode::Readwrite)?.put_with_key(handle, &id.into()).map_err(err)?;
+        result(&req).await.map(|_| ())
+    }
+
+    async fn recall(id: &str) -> Result<Option<JsValue>, String> {
+        let db = open_db().await?;
+        let req = store(&db, IdbTransactionMode::Readonly)?.get(&id.into()).map_err(err)?;
+        Ok(Some(result(&req).await?).filter(|v| !v.is_undefined()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn a_disk_path_round_trips_its_handle_id_and_name() {
+        let p = path("18f-2a", "Bracket v2.solidcraft");
+        assert_eq!(p, "/disk/18f-2a/Bracket v2.solidcraft");
+        assert_eq!(parse(&p), Some(("18f-2a", "Bracket v2.solidcraft")));
+    }
+
+    #[test]
+    fn only_disk_paths_parse() {
+        for not in [
+            "/opfs/a.solidcraft",
+            "/downloads/a.step",
+            "/upload/a.step",
+            "/disk/",
+            "/disk/id",
+            "/disk/id/",
+            "/disk//a",
+            "/disk/id/x/y",
+            "a.solidcraft",
+        ] {
+            assert_eq!(parse(not), None, "{not}");
+        }
+    }
+
+    /// Designs already stored in OPFS (and the recovery files) keep saving to OPFS under their own
+    /// names, whether or not the browser can write to the disk.
+    #[test]
+    fn writes_to_opfs_paths_still_go_to_opfs() {
+        for p in
+            ["/opfs/Bracket.solidcraft", "/opfs/Bracket (2).solidcraft", "/opfs/recovery.solidcraft", "/opfs/recovery.json", "/opfs/old.solvecraft"]
+        {
+            assert_eq!(route(p), WriteTo::Opfs, "{p}");
+        }
+        // A design opened from OPFS saves to its own path; only a Save As can pick the disk.
+        assert_eq!(save_target(false, true), SaveTarget::Browser);
+        assert_eq!(route(&format!("{OPFS_PREFIX}Bracket.solidcraft")), WriteTo::Opfs);
+        assert_eq!(route("/disk/18f-2a/Bracket.solidcraft"), WriteTo::Disk);
+        assert_eq!(route("/downloads/part.step"), WriteTo::Download);
+        assert_eq!(route("/upload/part.step"), WriteTo::Memory);
+    }
+
+    #[test]
+    fn handle_ids_differ_by_time_and_by_chance() {
+        assert_ne!(make_id(1, 5), make_id(2, 5));
+        assert_ne!(make_id(1, 5), make_id(1, 6));
+        assert!(!make_id(0, 0).contains('/'));
+    }
+
+    /// Save As: a design goes to the disk where the browser can pick files and to the browser's
+    /// storage where it cannot (today's behaviour); an export is a download either way.
+    #[test]
+    fn save_as_chooses_between_the_disk_the_browsers_storage_and_a_download() {
+        assert_eq!(save_target(true, true), SaveTarget::Disk);
+        assert_eq!(save_target(false, true), SaveTarget::Browser);
+        assert_eq!(save_target(true, false), SaveTarget::Download);
+        assert_eq!(save_target(false, false), SaveTarget::Download);
+    }
+
+    #[test]
+    fn only_design_opens_use_the_disk_dialog() {
+        assert!(opens_design(&[]));
+        assert!(opens_design(&["solidcraft"]));
+        assert!(opens_design(&["solvecraft"]));
+        assert!(!opens_design(&["step", "stp"]));
+        assert!(!opens_design(&["json"]));
+    }
+
+    #[test]
+    fn the_save_dialog_offers_the_type_of_the_name() {
+        assert_eq!(save_type("Plate.solidcraft").2, ".solidcraft");
+        assert_eq!(save_type("Plate.JSON").2, ".json");
+        assert_eq!(save_type("Plate").2, ".solidcraft");
+    }
+
+    #[test]
+    fn closing_a_dialog_is_not_an_error() {
+        assert!(is_abort("AbortError"));
+        assert!(!is_abort("NotAllowedError"));
+        assert!(!is_abort("SecurityError"));
+    }
+}

apps/solidcraft-web/src/files.rs

@@ -2,22 +2,26 @@
 //! the engine's in-memory files (`solidcraft_engine::io::vfs`) at start, written back whenever a
 //! command writes one. Files come in from the computer through a file picker (the File System
 //! Access API where the browser has it, an `<input type=file>` otherwise) or a drop on the page,
-//! and go out as downloads (exports, and "Download design"). An autosave of unsaved work is kept
-//! in OPFS too and offered again after a reload or a crash.
+//! and go out as downloads (exports, and "Download design"). Where the File System Access API
+//! exists a design also lives on the computer's disk, saved and opened through the browser's file
+//! dialogs (`disk.rs`). An autosave of unsaved work is kept in OPFS and offered again after a
+//! reload or a crash.
 
 use std::cell::{Cell, RefCell};
 use std::rc::Rc;
 
 use js_sys::{Array, Function, Object, Reflect, Uint8Array};
 use solidcraft_engine::io::vfs;
+
+use crate::disk;
 use wasm_bindgen::{JsCast as _, JsValue, closure::Closure};
 use wasm_bindgen_futures::{JsFuture, spawn_local};
 use web_sys::{FileSystemDirectoryHandle, FileSystemFileHandle, FileSystemGetFileOptions, FileSystemWritableFileStream};
 
 /// Where OPFS files appear to the engine.
-pub const OPFS: &str = "/opfs/";
+pub const OPFS: &str = disk::OPFS_PREFIX;
 /// Paths written here are handed to the user as downloads.
-pub const DOWNLOADS: &str = "/downloads/";
+pub const DOWNLOADS: &str = disk::DOWNLOADS_PREFIX;
 /// Files brought in from the computer.
 pub const UPLOAD: &str = "/upload/";
 /// The autosave of unsaved work (in OPFS: `recovery.solidcraft` and `recovery.json`).
@@ -51,6 +55,10 @@ pub struct Files {
     pub entries: RefCell<Vec<Entry>>,
     /// Files read from the computer: (name, bytes, what to do).
     pub incoming: RefCell<Vec<(String, Vec<u8>, Intent)>>,
+    /// Designs opened from the computer's disk: their paths in the engine's files.
+    pub opened: RefCell<Vec<String>>,
+    /// Disk designs whose last write failed: they are not saved.
+    pub unsaved: RefCell<Vec<String>>,
     /// Messages for the status line (errors and confirmations).
     pub messages: RefCell<Vec<(String, bool)>>,
     /// The stored designs are loaded (the app may open them).
@@ -64,11 +72,17 @@ pub struct Files {
 }
 
 impl Files {
-    fn say(&self, text: impl Into<String>, error: bool) {
+    pub fn say(&self, text: impl Into<String>, error: bool) {
         self.messages.borrow_mut().push((text.into(), error));
         self.wake();
     }
 
+    /// Writing the design at disk `path` failed: say so, and take its "saved" back.
+    pub fn failed_disk(&self, path: &str, error: &str) {
+        self.unsaved.borrow_mut().push(path.to_string());
+        self.say(format!("Not saved to your computer: {error}"), true);
+    }
+
     /// A file arrived from the computer.
     fn arrive(&self, name: String, bytes: Vec<u8>, intent: Intent) {
         self.incoming.borrow_mut().push((name, bytes, intent));
@@ -127,7 +141,7 @@ pub fn local_only() -> bool {
     LOCAL.with(Cell::get)
 }
 
-fn err(e: JsValue) -> String {
+pub(crate) fn err(e: JsValue) -> String {
     e.as_string().or_else(|| Reflect::get(&e, &"message".into()).ok().and_then(|m| m.as_string())).unwrap_or_else(|| format!("{e:?}"))
 }
 
@@ -150,7 +164,7 @@ async fn root() -> Result<FileSystemDirectoryHandle, String> {
     dir.dyn_into::<FileSystemDirectoryHandle>().map_err(|_| "this browser has no private file storage (OPFS)".to_string())
 }
 
-async fn read_handle(h: &FileSystemFileHandle) -> Result<Vec<u8>, String> {
+pub(crate) async fn read_handle(h: &FileSystemFileHandle) -> Result<Vec<u8>, String> {
     let file: web_sys::File = JsFuture::from(h.get_file()).await.map_err(err)?.dyn_into().map_err(|_| "not a file".to_string())?;
     blob_bytes(&file).await
 }
@@ -295,26 +309,32 @@ pub fn start(files: &Rc<Files>) {
 /// Store what commands wrote: OPFS paths into OPFS, download paths as downloads.
 pub fn flush(files: &Rc<Files>) {
     for (path, bytes) in vfs::take_writes() {
-        if let Some(name) = path.strip_prefix(OPFS) {
-            let name = name.to_string();
-            {
-                let mut e = files.entries.borrow_mut();
-                e.retain(|x| x.name != name);
-                if name != RECOVERY && name != RECOVERY_META {
-                    e.push(Entry { name: name.clone(), size: bytes.len() as u64, modified: js_sys::Date::now() });
-                    e.sort_by_key(|a| a.name.to_lowercase());
+        match disk::route(&path) {
+            disk::WriteTo::Opfs => {
+                let name = path.strip_prefix(OPFS).unwrap_or(&path).to_string();
+                {
+                    let mut e = files.entries.borrow_mut();
+                    e.retain(|x| x.name != name);
+                    if name != RECOVERY && name != RECOVERY_META {
+                        e.push(Entry { name: name.clone(), size: bytes.len() as u64, modified: js_sys::Date::now() });
+                        e.sort_by_key(|a| a.name.to_lowercase());
+                    }
                 }
+                let files = files.clone();
+                spawn_local(async move {
+                    if let Err(e) = write_file(&name, &bytes).await {
+                        files.say(format!("{name}: {e}"), true);
+                    }
+                });
             }
-            let files = files.clone();
-            spawn_local(async move {
-                if let Err(e) = write_file(&name, &bytes).await {
+            disk::WriteTo::Disk => disk::enqueue(files, &path, bytes),
+            disk::WriteTo::Download => {
+                let name = path.strip_prefix(DOWNLOADS).unwrap_or(&path);
+                if let Err(e) = download(name, &bytes) {
                     files.say(format!("{name}: {e}"), true);
                 }
-            });
-        } else if let Some(name) = path.strip_prefix(DOWNLOADS)
-            && let Err(e) = download(name, &bytes)
-        {
-            files.say(format!("{name}: {e}"), true);
+            }
+            disk::WriteTo::Memory => {}
         }
     }
 }
@@ -427,8 +447,15 @@ pub fn pick_from_disk(files: &Rc<Files>, intent: Intent) {
     let picker = Reflect::get(&window, &"showOpenFilePicker".into()).ok().and_then(|f| f.dyn_into::<Function>().ok());
     match picker {
         Some(f) => {
-            let opts = Object::new();
-            let _ = Reflect::set(&opts, &"multiple".into(), &JsValue::FALSE);
+            // A design from the computer's disk keeps its file, so Save writes back to it.
+            let on_disk = intent == Intent::Open && disk::supported();
+            let opts = if on_disk {
+                disk::open_options()
+            } else {
+                let opts = Object::new();
+                let _ = Reflect::set(&opts, &"multiple".into(), &JsValue::FALSE);
+                opts
+            };
             let promise = f.call1(&window, &opts);
             let files = files.clone();
             spawn_local(async move {
@@ -438,7 +465,13 @@ pub fn pick_from_disk(files: &Rc<Files>, intent: Intent) {
                     for h in handles.iter() {
                         let h: FileSystemFileHandle = h.dyn_into().map_err(|_| "not a file".to_string())?;
                         let bytes = read_handle(&h).await?;
-                        files.arrive(h.name(), bytes, intent);
+                        if on_disk && solidcraft_engine::io::is_design_path(&h.name()) {
+                            let path = disk::arrive(&h, bytes);
+                            files.opened.borrow_mut().push(path);
+                            files.wake();
+                        } else {
+                            files.arrive(h.name(), bytes, intent);
+                        }
                     }
                     Ok::<(), String>(())
                 };
@@ -458,7 +491,7 @@ fn input_picker(files: &Rc<Files>, intent: Intent) {
     let Some(doc) = web_sys::window().and_then(|w| w.document()) else { return };
     let Ok(input) = doc.create_element("input").map(|e| e.unchecked_into::<web_sys::HtmlInputElement>()) else { return };
     input.set_type("file");
-    input.set_accept(".solidcraft,.solvecraft,.json,.step,.stp,.3mf,.stl");
+    input.set_accept(".solidcraft,.solvecraft,.json,.step,.stp,.3mf,.stl,.obj,.glb,.gltf");
     // Attached (hidden) while it is open: some browsers ignore a click on a detached input.
     let _ = input.set_attribute("style", "display:none");
     if let Some(body) = doc.body() {

apps/solidcraft-web/src/install.rs

@@ -0,0 +1,67 @@
+//! Install as an app (`solidcraft_ui_egui::install`). The browser offers it with a
+//! `beforeinstallprompt` event, which can come before this code runs: index.html keeps the event
+//! as `window.solidcraftInstall` (and drops it once the app is installed). The offer is good for
+//! one prompt; a browser that is still willing makes a new one later. Safari makes no offer: it
+//! gets its steps, unless the app is already running installed.
+
+use solidcraft_ui_egui::install::{InstallApp, Offer, safari_steps};
+use wasm_bindgen::{JsCast as _, JsValue};
+
+/// Where index.html keeps the browser's offer.
+const OFFER: &str = "solidcraftInstall";
+
+/// The browser's offer, kept by index.html (None: none, or it was used).
+fn offer() -> Option<js_sys::Object> {
+    let window = web_sys::window()?;
+    js_sys::Reflect::get(&window, &OFFER.into()).ok()?.dyn_into().ok()
+}
+
+/// Show the browser's install prompt (from the File menu click, so the page may).
+fn prompt() {
+    let Some(offer) = offer() else { return };
+    if let Some(window) = web_sys::window() {
+        let _ = js_sys::Reflect::set(&window, &OFFER.into(), &JsValue::NULL);
+    }
+    let shown = js_sys::Reflect::get(&offer, &"prompt".into())
+        .and_then(|f| f.dyn_into::<js_sys::Function>().map_err(JsValue::from))
+        .and_then(|f| f.call0(&offer))
+        .and_then(|p| p.dyn_into::<js_sys::Promise>().map_err(JsValue::from));
+    match shown {
+        // Accepted or dismissed, the browser handles it; a refusal is only logged.
+        Ok(p) => wasm_bindgen_futures::spawn_local(async move {
+            if let Err(e) = wasm_bindgen_futures::JsFuture::from(p).await {
+                log::warn!("install prompt: {e:?}");
+            }
+        }),
+        Err(e) => log::warn!("install prompt: {e:?}"),
+    }
+}
+
+/// The page runs as the installed app (its own window, or from the Home Screen on iOS).
+fn running_installed(window: &web_sys::Window) -> bool {
+    let standalone = window.match_media("(display-mode: standalone)").ok().flatten().is_some_and(|m| m.matches());
+    let home_screen = js_sys::Reflect::get(&window.navigator(), &"standalone".into()).ok().and_then(|v| v.as_bool()).unwrap_or(false);
+    standalone || home_screen
+}
+
+/// The host service for File ▸ Install app…; the UI is drawn again whenever the browser
+/// makes or withdraws its offer (even with nothing else happening).
+pub fn service(ctx: &egui::Context) -> InstallApp {
+    // Safari's steps, decided once: the browser and the way the page runs don't change.
+    let steps = web_sys::window().filter(|w| !running_installed(w)).and_then(|w| {
+        let nav = w.navigator();
+        let vendor = js_sys::Reflect::get(&nav, &"vendor".into()).ok().and_then(|v| v.as_string()).unwrap_or_default();
+        safari_steps(&nav.user_agent().unwrap_or_default(), &vendor, nav.max_touch_points())
+    });
+    if let Some(window) = web_sys::window() {
+        for event in ["beforeinstallprompt", "appinstalled"] {
+            let ctx = ctx.clone();
+            let redraw = wasm_bindgen::closure::Closure::<dyn FnMut()>::new(move || ctx.request_repaint());
+            let _ = window.add_event_listener_with_callback(event, redraw.as_ref().unchecked_ref());
+            // The listener lives as long as the page.
+            redraw.forget();
+        }
+    }
+    let offered = move || if offer().is_some() { Some(Offer::Prompt) } else { steps.map(Offer::Steps) };
+    InstallApp { offer: Box::new(offered), prompt: Box::new(prompt) }
+}

apps/solidcraft-web/src/main.rs

@@ -2,12 +2,20 @@
 //!
 //! Runs the same [`solidcraft_ui_egui::SolveApp`] as the desktop app through eframe's web runner
 //! (wgpu: WebGPU where available, WebGL2 otherwise). Build with `trunk build --release` from this
-//! directory (output in `dist/web`). URL flags: `?webgl` forces WebGL2, `?sample` opens the
-//! sample part.
+//! directory (output in `dist/web`). URL flags: `?webgl` forces WebGL2 (remembered until
+//! `?webgpu`), `?sample` opens the sample part.
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 
+#[cfg(target_arch = "wasm32")]
+mod api;
+#[cfg(any(target_arch = "wasm32", test))]
+mod disk;
 #[cfg(target_arch = "wasm32")]
 mod files;
+#[cfg(target_arch = "wasm32")]
+mod install;
+#[cfg(any(target_arch = "wasm32", test))]
+mod space_mouse;
 
 #[cfg(target_arch = "wasm32")]
 mod web {
@@ -18,11 +26,41 @@ mod web {
     use solidcraft_ui_egui::{Services, SolveApp};
     use wasm_bindgen::JsCast as _;
 
+    use crate::api::Api;
+    use crate::disk::{self, SaveTarget};
     use crate::files::{self, Files, Intent};
+    use crate::space_mouse::SpaceMouse;
 
     const CANVAS_ID: &str = "solidcraft_canvas";
     const LOADING_ID: &str = "solidcraft_loading";
-    const DEPTH_BITS: u8 = 24;
+    /// A 32-bit float depth buffer (no stencil): WebGPU and WebGL2 both have it, and the viewport
+    /// draws it with reversed depth, whose precision follows the distance from the eye (#1434).
+    const DEPTH_BITS: u8 = 32;
+
+    /// The loading animation (assets/styles/web/loading-logo.svg) settles into the finished mark
+    /// about 3.2 s after the page starts; this adds a short hold. The app doesn't land before it.
+    const LOADING_MIN_MS: f64 = 3600.0;
+    /// The fade from the loading screen into the app.
+    const LOADING_FADE_MS: i32 = 300;
+
+    /// Take the loading screen away once the animation has played to the finished mark: wait out
+    /// what is left of `LOADING_MIN_MS`, fade it, then remove it.
+    fn dismiss_loading(el: web_sys::Element) {
+        let Some(window) = web_sys::window() else {
+            el.remove();
+            return;
+        };
+        let now = window.performance().map_or(LOADING_MIN_MS, |p| p.now());
+        let wait = (LOADING_MIN_MS - now).max(0.0) as i32;
+        let fade = wasm_bindgen::closure::Closure::once_into_js(move || {
+            let _ = el.set_attribute("class", "done");
+            let gone = wasm_bindgen::closure::Closure::once_into_js(move || el.remove());
+            if let Some(window) = web_sys::window() {
+                let _ = window.set_timeout_with_callback_and_timeout_and_arguments_0(gone.unchecked_ref(), LOADING_FADE_MS);
+            }
+        });
+        let _ = window.set_timeout_with_callback_and_timeout_and_arguments_0(fade.unchecked_ref(), wait);
+    }
 
     /// Seconds between autosaves of unsaved work.
     const AUTOSAVE_S: f64 = 30.0;
@@ -52,6 +90,7 @@ mod web {
 
     struct Shell {
         app: SolveApp,
+        api: Api,
         files: Rc<Files>,
         /// When the last autosave was (seconds), and the revision it holds (none stored: `None`).
         autosaved_at: f64,
@@ -65,6 +104,11 @@ mod web {
         /// On-demand CJK font: fetched only when a CJK language is selected.
         font: solidcraft_ui_egui::fonts::CjkFontLoader,
         font_result: FontLoadResult,
+        /// The fetched CJK font's bytes: kept so a language change can re-order the fallbacks.
+        cjk_bytes: Option<Vec<u8>>,
+        /// The language the fonts were last set up for (a CJK UI leads with the CJK face).
+        font_language: String,
+        space_mouse: SpaceMouse,
     }
 
     impl Shell {
@@ -73,11 +117,38 @@ mod web {
             if self.files.ctx.borrow().is_none() {
                 *self.files.ctx.borrow_mut() = Some(ctx.clone());
             }
+            // A ready picker answer is consumed in app.logic later in this frame. Keep
+            // incoming files queued until then so they cannot replace its target design.
+            if self.app.file_picker_busy() {
+                ctx.request_repaint();
+                return;
+            }
             files::flush(&self.files);
+            // A write to the computer's disk that failed: the design is not saved after all.
+            for path in self.files.unsaved.borrow_mut().drain(..) {
+                if self.app.session.path.as_deref() == Some(path.as_str()) {
+                    self.app.session.mark_unsaved();
+                }
+            }
+            // Designs opened from the computer's disk (the files window): open them.
+            let opened: Vec<_> = self.files.opened.borrow_mut().drain(..).collect();
+            for path in opened {
+                self.app.open_path(&path);
+                self.files.panel.set(false);
+            }
             for (text, error) in self.files.messages.borrow_mut().drain(..) {
                 self.app.set_status(text, error);
             }
-            let incoming: Vec<_> = self.files.incoming.borrow_mut().drain(..).collect();
+            let mut incoming: Vec<_> = self.files.incoming.borrow_mut().drain(..).collect();
+            // A glTF file's buffers picked with it are kept next to it, not opened.
+            incoming.retain_mut(|(name, bytes, _)| {
+                let companion =
+                    std::path::Path::new(name.as_str()).extension().and_then(|e| e.to_str()).is_some_and(|e| e.eq_ignore_ascii_case("bin"));
+                if companion {
+                    vfs::insert(&format!("{}{name}", files::UPLOAD), std::mem::take(bytes));
+                }
+                !companion
+            });
             for (name, bytes, intent) in incoming {
                 let design = solidcraft_engine::io::is_design_path(&name);
                 let path = if design && intent == Intent::Open {
@@ -110,7 +181,7 @@ mod web {
                 let changed = s.is_dirty() && self.autosaved != Some(s.revision);
                 let wait = AUTOSAVE_S - (now - self.autosaved_at);
                 if changed && wait <= 0.0 {
-                    files::autosave(&self.files, Some((&s.doc, s.path.as_deref())));
+                    files::autosave(&self.files, Some((&s.design(), s.path.as_deref())));
                     self.autosaved = Some(s.revision);
                     self.autosaved_at = now;
                 } else if changed {
@@ -168,6 +239,9 @@ mod web {
                             act = Some(("download_open", String::new()));
                         }
                     });
+                    if !disk::supported() {
+                        ui.weak("This browser can't save to a folder: designs stay in this browser. Download design saves a file.");
+                    }
                     ui.separator();
                     if !self.files.ready.get() {
                         ui.horizontal(|ui| {
@@ -214,6 +288,13 @@ mod web {
                                         self.renaming = Some((e.name.clone(), e.name.clone()));
                                         self.rename_focus = true;
                                     }
+                                    if ui
+                                        .small_button("Save to computer…")
+                                        .on_hover_text("A copy in a file you choose; the stored design stays here")
+                                        .clicked()
+                                    {
+                                        act = Some(("save_copy", e.name.clone()));
+                                    }
                                     if ui.small_button("Download").clicked() {
                                         act = Some(("download", e.name.clone()));
                                     }
@@ -249,9 +330,16 @@ mod web {
                     }
                     Err(e) => self.app.set_status(e.to_string(), true),
                 },
+                "save_copy" => match vfs::read(&path, solidcraft_engine::io::MAX_DESIGN_BYTES) {
+                    Ok(b) => disk::save_copy(&self.files, &name, b),
+                    Err(e) => self.app.set_status(e.to_string(), true),
+                },
                 "download_open" => {
                     let d = &self.app.session.doc;
-                    let result = solidcraft_engine::io::write_design_container(d)
+                    let result = self
+                        .app
+                        .session
+                        .design_container(solidcraft_engine::io::DesignCompression::Fast, false, false)
                         .map_err(|e| e.to_string())
                         .and_then(|bytes| files::download(&format!("{}.{}", d.name, solidcraft_engine::io::DESIGN_EXT), &bytes));
                     if let Err(e) = result {
@@ -320,7 +408,10 @@ mod web {
             let done = self.font_result.borrow_mut().take();
             if let Some(res) = done {
                 let installed = match res {
-                    Ok(bytes) => solidcraft_ui_egui::fonts::install_cjk_font(ctx, bytes),
+                    Ok(bytes) => {
+                        self.cjk_bytes = Some(bytes);
+                        true
+                    }
                     Err(err) => {
                         log::warn!("failed to fetch CJK font from {JAPANESE_FONT_PATH}: {err}");
                         false
@@ -328,21 +419,51 @@ mod web {
                 };
                 if installed {
                     log::info!("loaded web CJK font from {JAPANESE_FONT_PATH}");
-                } else {
+                } else if solidcraft_ui_egui::fonts::needs_cjk_font(&self.app.preferences.language) {
                     log::warn!("CJK font unavailable; showing English for this session");
                 }
                 self.font.finished(installed, &mut self.app.preferences.language);
+                self.apply_fonts(ctx);
                 ctx.request_repaint();
             }
             if self.font.tick(&mut self.app.preferences.language) {
-                let slot = self.font_result.clone();
-                let ctx = ctx.clone();
-                wasm_bindgen_futures::spawn_local(async move {
-                    let res = fetch_font_bytes(JAPANESE_FONT_PATH).await;
-                    *slot.borrow_mut() = Some(res);
-                    ctx.request_repaint();
-                });
+                self.fetch_font(ctx);
             }
+            // The CJK face leads only a CJK UI: its Cyrillic glyphs are full-width, so switching
+            // to Ukrainian (or English) must put the Latin face back in front.
+            if self.app.preferences.language != self.font_language {
+                self.apply_fonts(ctx);
+            }
+        }
+
+        /// Set up the UI fonts for the live language, keeping the fetched CJK font as a fallback
+        /// (it leads only for a CJK UI, see [`solidcraft_ui_egui::fonts::install_cjk_font_for`]).
+        fn apply_fonts(&mut self, ctx: &egui::Context) {
+            match self.cjk_bytes.clone() {
+                Some(bytes) => {
+                    solidcraft_ui_egui::fonts::install_cjk_font_for(ctx, bytes, &self.app.preferences.language);
+                }
+                None => solidcraft_ui_egui::fonts::setup_fonts(ctx),
+            }
+            self.font_language.clone_from(&self.app.preferences.language);
+        }
+
+        /// CJK text on screen with no CJK font yet (an English UI showing a Japanese name):
+        /// fetch the font, so the text does not stay tofu (#720).
+        fn watch_text_for_font(&mut self, ctx: &egui::Context) {
+            if self.font.watching_text() && solidcraft_ui_egui::fonts::painted_cjk(ctx) && self.font.text_needs_font() {
+                self.fetch_font(ctx);
+            }
+        }
+
+        fn fetch_font(&self, ctx: &egui::Context) {
+            let slot = self.font_result.clone();
+            let ctx = ctx.clone();
+            wasm_bindgen_futures::spawn_local(async move {
+                let res = fetch_font_bytes(JAPANESE_FONT_PATH).await;
+                *slot.borrow_mut() = Some(res);
+                ctx.request_repaint();
+            });
         }
     }
 
@@ -350,11 +471,15 @@ mod web {
         fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
             self.tick_font(ctx);
             self.app.logic(ctx);
+            self.api.poll();
+            self.space_mouse.logic(&mut self.app, ctx);
             self.files_tick(ctx);
             UNSAVED.with(|u| u.set(solidcraft_ui_egui::documents::any_dirty(&self.app)));
         }
-        fn raw_input_hook(&mut self, _ctx: &egui::Context, raw: &mut egui::RawInput) {
+        fn raw_input_hook(&mut self, ctx: &egui::Context, raw: &mut egui::RawInput) {
             files::take_drops(&self.files, raw);
+            // Before the app's own hook, which adds the control channel's events.
+            self.space_mouse.raw_input_hook(ctx, self.app.preferences.space_mouse_enabled, raw);
             self.app.raw_input_hook(raw);
         }
         fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
@@ -362,6 +487,7 @@ mod web {
             let ctx = ui.ctx().clone();
             self.file_panel(&ctx);
             self.recovery_prompt(&ctx);
+            self.watch_text_for_font(&ctx);
         }
         fn save(&mut self, storage: &mut dyn eframe::Storage) {
             // Persist the user's own language, not a session-only English fallback.
@@ -376,6 +502,29 @@ mod web {
         web_sys::window().and_then(|w| w.location().search().ok()).unwrap_or_default()
     }
 
+    /// Where `?webgl` is remembered. The installed app starts from its manifest's start URL, which
+    /// has no query, so the choice has to outlive the page it was made on.
+    const WEBGL_KEY: &str = "solidcraft.webgl";
+
+    /// Render with WebGL2: asked for now (`?webgl`, remembered) or before (until `?webgpu`).
+    fn webgl() -> bool {
+        let storage = web_sys::window().and_then(|w| w.local_storage().ok().flatten());
+        let q = query();
+        if q.contains("webgl") {
+            if let Some(s) = &storage {
+                let _ = s.set_item(WEBGL_KEY, "1");
+            }
+            return true;
+        }
+        if q.contains("webgpu") {
+            if let Some(s) = &storage {
+                let _ = s.remove_item(WEBGL_KEY);
+            }
+            return false;
+        }
+        storage.and_then(|s| s.get_item(WEBGL_KEY).ok().flatten()).is_some()
+    }
+
     /// Fetch font bytes asynchronously through the browser.
     async fn fetch_font_bytes(url: &str) -> Result<Vec<u8>, String> {
         let window = web_sys::window().ok_or("no window")?;
@@ -400,7 +549,7 @@ mod web {
                 return;
             };
             let mut options = eframe::WebOptions { depth_buffer: DEPTH_BITS, ..Default::default() };
-            if query().contains("webgl")
+            if webgl()
                 && let eframe::egui_wgpu::WgpuSetup::CreateNew(create) = &mut options.wgpu_options.wgpu_setup
             {
                 create.instance_descriptor.backends = eframe::wgpu::Backends::GL;
@@ -413,21 +562,40 @@ mod web {
                         solidcraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
                         let files = Rc::new(Files::default());
                         files::start(&files);
-                        let panel = files.clone();
+                        let (panel, opener, saver, shown) = (files.clone(), files.clone(), files.clone(), files.clone());
                         let services = Services {
-                            // Open shows the browser's files (and the computer's, from there).
-                            pick_open: Some(Box::new(move || {
+                            // Open shows the browser's open dialog for a design where it has one
+                            // (the file keeps its handle, so Save writes back to it); otherwise,
+                            // and for inserting STEP or meshes, the browser's files window.
+                            pick_open: Some(Box::new(move |exts: &[&str]| {
+                                if disk::handles_open(exts) {
+                                    return Box::pin(disk::pick_open(&opener));
+                                }
                                 panel.panel.set(true);
-                                None
+                                Box::pin(std::future::ready(None))
                             })),
-                            // Designs are kept in the browser; everything else is downloaded.
-                            pick_save: Some(Box::new(|name: &str, exts: &[&str]| {
+                            // A design is saved to a file the user picks, or kept in the browser
+                            // where the browser can't pick one; everything else is downloaded.
+                            pick_save: Some(Box::new(move |name: &str, exts: &[&str]| {
                                 let design = exts.contains(&solidcraft_engine::io::DESIGN_EXT);
-                                Some(format!("{}{name}", if design { files::OPFS } else { files::DOWNLOADS }))
+                                match disk::save_target(disk::supported(), design) {
+                                    SaveTarget::Disk => Box::pin(disk::pick_save(&saver, name)),
+                                    SaveTarget::Browser => {
+                                        saver.say("This browser can't save to a folder: the design is kept in this browser. File > Download design saves a file.", false);
+                                        Box::pin(std::future::ready(Some(format!("{}{name}", files::OPFS))))
+                                    }
+                                    SaveTarget::Download => Box::pin(std::future::ready(Some(format!("{}{name}", files::DOWNLOADS)))),
+                                }
                             })),
+                            download_design: Some(Box::new(files::download)),
+                            browser_files: Some(Box::new(move || shown.panel.set(true))),
+                            install_app: Some(crate::install::service(&cc.egui_ctx)),
                             ..Default::default()
                         };
-                        let mut app = SolveApp::new(Session::default(), services);
+                        // Thumbnails of saves and start-page cards.
+                        solidcraft_ui_egui::gpu::install_cpu_picture_renderer();
+                        let (sender, receiver) = std::sync::mpsc::channel();
+                        let mut app = SolveApp::new(Session::default(), services).with_control(receiver);
                         if let Some(p) = cc.storage.and_then(|s| solidcraft_ui_egui::prefs::stored(|k| s.get_string(k))) {
                             app.load_prefs(&p);
                         }
@@ -443,11 +611,17 @@ mod web {
                             app.session.mark_saved();
                         }
                         if !query().contains("sample") {
+                            // The empty design takes Units of new designs (#1205). The sample
+                            // part is built in millimetres and is left that way.
+                            solidcraft_ui_egui::prefs::apply_new_design(&mut app);
                             let rev = app.session.revision;
                             app.home.show(rev);
                         }
+                        let api = Api::install(sender, cc.egui_ctx.clone()).map_err(|e| format!("SolidCraft browser API: {e:?}"))?;
+                        let font_language = app.preferences.language.clone();
                         Ok(Box::new(Shell {
                             app,
+                            api,
                             files,
                             autosaved_at: f64::NEG_INFINITY,
                             autosaved: None,
@@ -456,13 +630,16 @@ mod web {
                             recents_synced: false,
                             font: Default::default(),
                             font_result: Rc::new(std::cell::RefCell::new(None)),
+                            cjk_bytes: None,
+                            font_language,
+                            space_mouse: SpaceMouse::default(),
                         }))
                     }),
                 )
                 .await;
             if let Some(el) = document.get_element_by_id(LOADING_ID) {
                 match result {
-                    Ok(()) => el.remove(),
+                    Ok(()) => dismiss_loading(el),
                     Err(e) => {
                         el.set_inner_html(&format!("<p>SolidCraft failed to start: {e:?}</p><p>A browser with WebGPU or WebGL2 is required.</p>"))
                     }

apps/solidcraft-web/src/space_mouse.rs

@@ -0,0 +1,367 @@
+//! The 3D mouse in the browser (#1336), through the Gamepad API.
+//!
+//! Chromium browsers list a 3Dconnexion device itself, with its six axes scaled to -1..1 from the
+//! device's ±350. Firefox lists only joysticks and gamepads (a 3D mouse is a HID multi-axis
+//! controller), but 3DxWare's virtual joystick carries the same six axes once 3DxWare's profile
+//! for Firefox sends them there. Both come in the device's own order and signs, so the shared
+//! navigation takes them with 3DxWare's object-mode mapping, as the Linux app does without a
+//! profile.
+
+use solidcraft_ui_egui::space_mouse::{Axes, Calibration, FULL_SCALE, calibrated};
+
+/// Logitech's vendor id, which older 3Dconnexion devices carry, and those devices' product ids
+/// (usb.ids). Logitech's own gamepads and wheels carry the same vendor id.
+const LOGITECH: u16 = 0x046d;
+const LOGITECH_3D_MICE: [u16; 11] = [0xc603, 0xc605, 0xc606, 0xc621, 0xc623, 0xc625, 0xc626, 0xc627, 0xc628, 0xc629, 0xc62b];
+/// 3Dconnexion's own vendor id. The browser lists only its 3D mice as gamepads: its mice, and the
+/// mouse side of its receivers, are not gamepads.
+const THREEDCONNEXION: u16 = 0x256f;
+/// 3DxWare's virtual joystick.
+const VIRTUAL_JOYSTICK: (u16, u16) = (0xbeef, 0x046d);
+
+/// What a gamepad the browser lists is, when it is a 3D mouse. A device is read before the
+/// joystick: in a Chromium browser both are listed, and the joystick stays at rest.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub enum Source {
+    Device,
+    VirtualJoystick,
+}
+
+/// The vendor and product ids in a gamepad's id: `Name (Vendor: 046d Product: c62b)` in Chromium
+/// browsers, `046d-c62b-Name` in Firefox.
+fn vendor_product(id: &str) -> Option<(u16, u16)> {
+    fn hex(digits: &str) -> Option<u16> {
+        if (1..=4).contains(&digits.len()) && digits.bytes().all(|b| b.is_ascii_hexdigit()) { u16::from_str_radix(digits, 16).ok() } else { None }
+    }
+    if let Some((_, ids)) = id.rsplit_once("Vendor: ") {
+        let (vendor, rest) = ids.split_once(" Product: ")?;
+        let product = rest.split(|c: char| !c.is_ascii_hexdigit()).next()?;
+        return Some((hex(vendor)?, hex(product)?));
+    }
+    let mut parts = id.splitn(3, '-');
+    let (vendor, product, _name) = (parts.next()?, parts.next()?, parts.next()?);
+    Some((hex(vendor)?, hex(product)?))
+}
+
+/// Whether a gamepad is a 3D mouse, from the id the browser gives it.
+pub fn source(id: &str) -> Option<Source> {
+    match vendor_product(id)? {
+        VIRTUAL_JOYSTICK => Some(Source::VirtualJoystick),
+        (THREEDCONNEXION, _) => Some(Source::Device),
+        (LOGITECH, product) if LOGITECH_3D_MICE.contains(&product) => Some(Source::Device),
+        _ => None,
+    }
+}
+
+/// The six axes in the device's raw units, from a gamepad's axes (-1..1). Fewer than six: not a
+/// 3D mouse. A value that isn't a number reads as rest.
+pub fn axes(values: &[f64]) -> Option<Axes> {
+    let raw = |i: usize| values.get(i).map(|&v| if v.is_finite() { (v.clamp(-1.0, 1.0) * f64::from(FULL_SCALE)).round() as i16 } else { 0 });
+    Some(Axes { translation: [raw(0)?, raw(1)?, raw(2)?], rotation: [raw(3)?, raw(4)?, raw(5)?] })
+}
+
+/// What a calibration of the gamepad with this id is saved under: `web` and its vendor and
+/// product ids.
+pub fn device_key(id: &str) -> Option<String> {
+    vendor_product(id).map(|(vendor, product)| format!("web {vendor:04x}:{product:04x}"))
+}
+
+/// The 3D mouse to read among the ones listed: the first device, else the first joystick.
+pub fn choose<T>(found: impl IntoIterator<Item = (Source, T)>) -> Option<T> {
+    found.into_iter().min_by_key(|(source, _)| *source).map(|(_, reading)| reading)
+}
+
+/// Whether the cap is moving as the next frame will see it: through the device's calibration
+/// (as of the last frame) when it has one. The idle page wakes for a short-range device's push,
+/// and not for a device resting off zero; the wheel filter goes by the same.
+pub fn moving(axes: Axes, calibration: Option<Calibration>) -> bool {
+    calibrated(axes, calibration).moving()
+}
+
+/// The calibration as of the last frame, and the device it was for.
+pub type Cached = (Option<String>, Option<Calibration>);
+
+/// Whether the cap of `device` is moving, judged with the calibration kept from the last frame:
+/// `None` when that was for another device, so another's calibration never judges this one. The
+/// waker then lets a frame look, which brings the cache up to date.
+pub fn moving_as_cached(device: &Option<String>, axes: Axes, cached: &Cached) -> Option<bool> {
+    (*device == cached.0).then(|| moving(axes, cached.1))
+}
+
+/// Whether the idle page's timer redraws: when the cap is moving as the last frame's calibration
+/// judges it, when the device read isn't the one that calibration was for (a frame then judges
+/// it with its own), and once when the device the last frame read is gone, so the page shows
+/// that. With no device, and none last frame, it stays quiet.
+pub fn wakes(reading: Option<(Option<String>, Axes)>, cached: &Cached) -> bool {
+    match reading {
+        Some((device, axes)) => moving_as_cached(&device, axes, cached).unwrap_or(true),
+        None => cached.0.is_some(),
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+pub use browser::SpaceMouse;
+
+#[cfg(target_arch = "wasm32")]
+mod browser {
+    use std::cell::{Cell, RefCell};
+    use std::rc::Rc;
+
+    use solidcraft_ui_egui::SolveApp;
+    use solidcraft_ui_egui::space_mouse::{Axes, DriverMapping, calibration, navigate_frame};
+    use wasm_bindgen::JsCast as _;
+    use wasm_bindgen::closure::Closure;
+
+    use solidcraft_ui_egui::space_mouse::WheelGuard;
+
+    use super::{Cached, axes, choose, device_key, moving_as_cached, source, wakes};
+
+    /// How often the page looks for the cap starting to move while nothing else redraws.
+    const WAKE_MS: i32 = 50;
+
+    /// The 3D mouse the browser lists, if any: its calibration key and its axes.
+    fn read() -> Option<(Option<String>, Axes)> {
+        let pads = web_sys::window()?.navigator().get_gamepads().ok()?;
+        choose(pads.iter().filter_map(|pad| {
+            let pad = pad.dyn_into::<web_sys::Gamepad>().ok().filter(web_sys::Gamepad::connected)?;
+            let source = source(&pad.id())?;
+            let values: Vec<f64> = pad.axes().iter().map(|v| v.as_f64().unwrap_or(f64::NAN)).collect();
+            Some((source, (device_key(&pad.id()), axes(&values)?)))
+        }))
+    }
+
+    /// Reads the 3D mouse once per frame and moves the view with it.
+    #[derive(Default)]
+    pub struct SpaceMouse {
+        axes: Axes,
+        /// The 3D mouse being read, as `SolveApp::space_mouse` keeps it.
+        device: Option<String>,
+        /// The previous frame's time and the step since it (seconds).
+        last: Option<f64>,
+        seconds: f64,
+        wheel: WheelGuard,
+        /// Listening for gamepads (from the first frame with navigation on).
+        listening: bool,
+        /// The timer that wakes the app when the cap starts moving runs (from when a 3D mouse
+        /// is first listed).
+        waking: bool,
+        /// Navigation is on (the waker reads it).
+        enabled: Rc<Cell<bool>>,
+        /// The calibration as of the last frame and its device (the waker and the wheel filter read it).
+        cached: Rc<RefCell<Cached>>,
+    }
+
+    impl SpaceMouse {
+        /// At the start of a frame: reads the cap and drops 3DxWare's emulated wheel from the
+        /// frame's input, before the app sees it.
+        pub fn raw_input_hook(&mut self, ctx: &egui::Context, enabled: bool, raw: &mut egui::RawInput) {
+            let now = raw.time.unwrap_or_else(|| js_sys::Date::now() / 1000.0);
+            self.seconds = self.last.map_or(0.0, |last| now - last);
+            self.last = Some(now);
+            self.enabled.set(enabled);
+            self.axes = Axes::default();
+            if !enabled {
+                return;
+            }
+            if !self.listening {
+                self.listening = true;
+                listen(ctx);
+            }
+            let reading = read();
+            if reading.is_some() && !self.waking {
+                self.waking = wake(ctx, &self.enabled, &self.cached);
+            }
+            // As read: calibration needs the readings at rest too, and `navigate_frame` leaves a
+            // cap resting inside the dead zone alone.
+            (self.device, self.axes) = reading.unwrap_or_default();
+            let moving = moving_as_cached(&self.device, self.axes, &self.cached.borrow()).unwrap_or_else(|| self.axes.moving());
+            self.wheel.filter(moving, now, &mut raw.events);
+        }
+
+        pub fn logic(&self, app: &mut SolveApp, ctx: &egui::Context) {
+            app.space_mouse.device.clone_from(&self.device);
+            *self.cached.borrow_mut() = (self.device.clone(), calibration(app));
+            navigate_frame(app, ctx, DriverMapping::object_mode(), self.axes, self.seconds);
+        }
+    }
+
+    /// A 3D mouse is listed only once it has been moved on the page: redraw then, so the frame
+    /// finds it without waiting for the pointer.
+    fn listen(ctx: &egui::Context) {
+        let Some(window) = web_sys::window() else { return };
+        let ctx = ctx.clone();
+        let on_connect = Closure::<dyn FnMut()>::new(move || ctx.request_repaint());
+        let _ = window.add_event_listener_with_callback("gamepadconnected", on_connect.as_ref().unchecked_ref());
+        // The listener lives as long as the page.
+        on_connect.forget();
+    }
+
+    /// The browser sends no event when a gamepad moves, so a timer looks while the app is idle and
+    /// redraws when the cap starts moving; the frames that follow keep going on their own.
+    fn wake(ctx: &egui::Context, enabled: &Rc<Cell<bool>>, cached: &Rc<RefCell<Cached>>) -> bool {
+        let Some(window) = web_sys::window() else { return false };
+        let (ctx, enabled, cached) = (ctx.clone(), Rc::clone(enabled), Rc::clone(cached));
+        let tick = Closure::<dyn FnMut()>::new(move || {
+            if enabled.get() && wakes(read(), &cached.borrow()) {
+                ctx.request_repaint();
+            }
+        });
+        let started = window.set_interval_with_callback_and_timeout_and_arguments_0(tick.as_ref().unchecked_ref(), WAKE_MS).is_ok();
+        // The timer lives as long as the page.
+        tick.forget();
+        started
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn recognises_3d_mice_in_each_browsers_ids() {
+        // As Edge and Firefox list them (Windows 11, SpaceMouse Pro, 3DxWare 10).
+        assert_eq!(source("SpaceMouse Pro (Vendor: 046d Product: c62b)"), Some(Source::Device));
+        assert_eq!(source("Unknown Gamepad (Vendor: beef Product: 046d)"), Some(Source::VirtualJoystick));
+        assert_eq!(source("beef-046d-Unknown Gamepad"), Some(Source::VirtualJoystick));
+        // 3Dconnexion's own vendor id, any product; the older devices under Logitech's.
+        assert_eq!(source("SpaceMouse Compact (Vendor: 256f Product: c635)"), Some(Source::Device));
+        assert_eq!(source("256f-c652-3Dconnexion Universal Receiver"), Some(Source::Device));
+        assert_eq!(source("46d-c626-SpaceNavigator"), Some(Source::Device));
+        assert_eq!(source("SpaceNavigator (STANDARD GAMEPAD Vendor: 046d Product: c626)"), Some(Source::Device));
+        for product in LOGITECH_3D_MICE {
+            assert_eq!(source(&format!("x (Vendor: 046d Product: {product:04x})")), Some(Source::Device));
+            assert_eq!(source(&format!("046d-{product:04X}-x")), Some(Source::Device));
+        }
+    }
+
+    #[test]
+    fn a_calibration_is_saved_under_the_ids_whichever_browser_lists_it() {
+        assert_eq!(device_key("SpaceMouse Pro (Vendor: 046d Product: c62b)").as_deref(), Some("web 046d:c62b"));
+        assert_eq!(device_key("46d-c62b-SpaceMouse Pro").as_deref(), Some("web 046d:c62b"));
+        assert_eq!(device_key("Xbox Wireless Controller"), None);
+    }
+
+    #[test]
+    fn the_idle_page_wakes_for_motion_as_calibrated_not_as_read() {
+        let axis =
+            |source, rest, full| solidcraft_ui_egui::space_mouse::AxisCalibration { source, reversed: false, rest, dead_zone: 0, full: [full; 2] };
+        // A short-range device: 15 of its 50 is under the raw dead zone, but 105 of 350 calibrated.
+        let short = Calibration { dead_zone_share: 0.0, axes: std::array::from_fn(|r| axis(r, 0, 50)) };
+        let push = Axes { translation: [15, 0, 0], rotation: [0; 3] };
+        assert!(!push.moving() && moving(push, Some(short)));
+        // A device resting at 100 on every axis: past the raw dead zone, but at rest calibrated.
+        let offset = Calibration { dead_zone_share: 0.0, axes: std::array::from_fn(|r| axis(r, 100, 350)) };
+        let resting = Axes { translation: [100; 3], rotation: [100; 3] };
+        assert!(resting.moving() && !moving(resting, Some(offset)));
+        // Without a calibration, as read.
+        assert!(!moving(push, None) && moving(resting, None));
+        // Kept from the last frame: only for the device it was for.
+        let (a, b) = (Some("web 256f:c63a".to_string()), Some("web 1234:5678".to_string()));
+        assert_eq!(moving_as_cached(&b, push, &(b.clone(), Some(short))), Some(true));
+        assert_eq!(moving_as_cached(&b, push, &(a.clone(), Some(offset))), None, "A's calibration doesn't judge B");
+        assert_eq!(moving_as_cached(&b, push, &(None, None)), None);
+        assert_eq!(moving_as_cached(&a, resting, &(a.clone(), None)), Some(true), "A was read without a calibration");
+    }
+
+    #[test]
+    fn the_idle_page_wakes_once_for_a_device_change_and_stays_quiet_without_one() {
+        let (a, b) = (Some("web 256f:c63a".to_string()), Some("web 1234:5678".to_string()));
+        let still = Axes::default();
+        let last_frame_read_a: Cached = (a.clone(), None);
+        assert!(!wakes(Some((a.clone(), still)), &last_frame_read_a), "A, at rest");
+        assert!(wakes(Some((b.clone(), still)), &last_frame_read_a), "A to B: a frame looks at B");
+        assert!(wakes(None, &last_frame_read_a), "A to none: a frame shows it's gone");
+        assert!(!wakes(None, &(None, None)), "none to none: quiet");
+    }
+
+    #[test]
+    fn gamepads_and_other_logitech_devices_are_not_3d_mice() {
+        for id in [
+            "Logitech Dual Action (STANDARD GAMEPAD Vendor: 046d Product: c216)",
+            "046d-c21d-Logitech Gamepad F310",
+            "G29 Driving Force Racing Wheel (Vendor: 046d Product: c24f)",
+            "046d-c215-Logitech Extreme 3D",
+            "NuLOOQ navigator (Vendor: 046d Product: c640)",
+            "Xbox 360 Controller (XInput STANDARD GAMEPAD)",
+            "45e-28e-Xbox 360 Wired Controller",
+            "beef-046e-Unknown Gamepad",
+            "beee-046d-Unknown Gamepad",
+            "",
+            "-",
+            "--",
+            "256f-",
+            "256f-c635",
+            "Vendor: 256f",
+            "Vendor: 256f Product: ",
+            "x (Vendor: 256fff Product: c635)",
+            "x (Vendor: zz6f Product: c635)",
+            "12345-c635-x",
+            "256f--x",
+            "SpaceMouse Pro",
+        ] {
+            assert_eq!(source(id), None, "{id:?}");
+        }
+    }
+
+    #[test]
+    fn ids_never_panic() {
+        // Hostile and odd ids: multi-byte text around the markers, markers repeated or cut short.
+        for id in [
+            "Vendor: é Product: ü",
+            "Vendor: Vendor: 256f Product: c635)",
+            "é-ü-ö",
+            "Ⅰ (Vendor: 256f Product: c6Ⅰ)",
+            "\u{0}-\u{0}-\u{0}",
+            "Vendor: 256f Product: c635 Vendor: ",
+        ] {
+            let _ = source(id);
+        }
+        let mut seed = 0x2545_f491_4f6c_dd1d_u64;
+        let alphabet: Vec<char> = "0123456789abcdefABCDEF- ():VendorProductéⅠ\u{0}".chars().collect();
+        for _ in 0..20_000 {
+            let len = (seed % 40) as usize;
+            let id: String = (0..len)
+                .map(|_| {
+                    seed ^= seed << 13;
+                    seed ^= seed >> 7;
+                    seed ^= seed << 17;
+                    alphabet[(seed % alphabet.len() as u64) as usize]
+                })
+                .collect();
+            if let Some(Source::Device) = source(&id) {
+                let (vendor, product) = vendor_product(&id).expect("recognised ids have both");
+                assert!(vendor == THREEDCONNEXION || (vendor == LOGITECH && LOGITECH_3D_MICE.contains(&product)), "{id:?}");
+            }
+        }
+    }
+
+    #[test]
+    fn gamepad_axes_are_the_devices_raw_units() {
+        // Full deflection is the desktop's 350, and the browser's scale keeps the device's steps.
+        let axes = axes(&[1.0, -1.0, 0.5, -0.5, 2.0 / 700.0, 0.0]).expect("six axes");
+        assert_eq!(axes, Axes { translation: [350, -350, 175], rotation: [-175, 1, 0] });
+        for raw in -350_i16..=350 {
+            let value = f64::from(raw) / 350.0;
+            assert_eq!(super::axes(&[value; 6]).map(|a| a.translation[0]), Some(raw));
+        }
+        // Past full deflection is full deflection; anything that isn't a number is rest.
+        let hostile = super::axes(&[f64::NAN, f64::INFINITY, f64::NEG_INFINITY, 1e300, -1e300, f64::MIN_POSITIVE]).expect("six axes");
+        assert_eq!(hostile, Axes { translation: [0, 0, 0], rotation: [350, -350, 0] });
+        // A gamepad with fewer than six axes is not a 3D mouse; extra axes are ignored.
+        assert_eq!(super::axes(&[1.0; 5]), None);
+        assert_eq!(super::axes(&[]), None);
+        assert_eq!(super::axes(&[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0]), Some(Axes::default()));
+    }
+
+    #[test]
+    fn a_device_is_read_before_the_virtual_joystick() {
+        let moving = Axes { translation: [100, 0, 0], rotation: [0; 3] };
+        let other = Axes { translation: [0, 200, 0], rotation: [0; 3] };
+        assert_eq!(choose([(Source::VirtualJoystick, other), (Source::Device, moving)]), Some(moving));
+        assert_eq!(choose([(Source::Device, moving), (Source::VirtualJoystick, other)]), Some(moving));
+        assert_eq!(choose([(Source::VirtualJoystick, other)]), Some(other));
+        // Two devices: the first listed.
+        assert_eq!(choose([(Source::Device, moving), (Source::Device, other)]), Some(moving));
+        assert_eq!(choose::<Axes>([]), None);
+    }
+}

apps/solidcraft-web/sw.js

@@ -0,0 +1,235 @@
+// SolidCraft's service worker: the web app keeps working offline and updates itself.
+//
+// `cargo xtask web-offline` (Trunk's post_build hook) writes the build into the line below: the
+// version (workspace version + a hash of every built file) and the files to keep, each with its
+// SHA-256, and the same as `build.json` next to it. Files the app only fetches when it needs
+// them (the CJK font) aren't kept: they come from the network. Every download is checked
+// against its SHA-256: a deployment that lands mid-download (another build's `index.html`) fails
+// the download instead of mixing into the kept build. A new build changes this file, so the
+// browser installs the new worker, which keeps the whole new build before taking over.
+//
+// A launch only ever starts a build whose every file is kept, so a half-downloaded update can't
+// break it. It asks for `build.json` (waiting at most NAVIGATE_TIMEOUT_MS): offline, slow or
+// unchanged, the kept build starts; when a new build is deployed, it is downloaded first
+// (waiting at most UPDATE_TIMEOUT_MS; the download goes on in the background after that) and
+// started. When the site has no `build.json` (the app was removed), launches go to the network,
+// the kept build answering when that fails. So they do when `build.json` is redirected or
+// refused (a sign-in in front of the app): the browser then shows the sign-in. Each page then
+// gets its files from the build it started (remembered in PAGES), never from another build
+// with a file of the same name.
+//
+// A cache is only deleted when nothing uses it: a download holds its lock (Web Locks, shared,
+// in any tab or worker; the browser releases it when the download ends or its worker stops), and
+// an open page uses the build it started. Then unfinished downloads are dropped, and so are
+// builds replaced by a newer worker (RETIRED). The origin is shared with other apps (github.io)
+// and other copies of this one (the release zip works from any path): only caches named after
+// this worker's path (CACHE_PREFIX…, PAGES) are ever touched.
+//
+// Unbuilt (VERSION "dev", as debug builds get it), the worker retires: it drops what a release
+// build kept and unregisters, so `trunk serve` after `trunk serve --release --no-autoreload`
+// shows the development build. Deploying this file unbuilt switches the worker off for everyone.
+/* @build */ const VERSION = "dev", FILES = [];
+const RETIRE = VERSION === "dev";
+
+const PATH = new URL(self.registration.scope).pathname;
+const CACHE_PREFIX = `solidcraft-app ${PATH} `;
+const CACHE = CACHE_PREFIX + VERSION;
+/** Which build each open page started: page id → cache name (or NETWORK). */
+const PAGES = `solidcraft-app-pages ${PATH}`;
+/** A page that came from the network gets its files from there too. */
+const NETWORK = "network";
+const NAVIGATE_TIMEOUT_MS = 4000;
+const UPDATE_TIMEOUT_MS = 20000;
+/** The entry that marks a cache as holding its whole build. */
+const COMPLETE = "build-complete";
+/** The entry that marks a build replaced by a newer worker. */
+const RETIRED = "build-retired";
+/** A page remembered this recently may still be loading (not yet listed among the clients). */
+const PAGE_LOADING_MS = 30 * 1000;
+
+const url = (file) => new URL(file, self.registration.scope).href;
+const has = (name, entry) => caches.match(url(entry), { cacheName: name }).then(Boolean);
+
+/** Run `fn` while using the cache `name`: it isn't deleted meanwhile. */
+const using = (name, fn) => navigator.locks.request(name, { mode: "shared" }, fn);
+
+/** Delete the cache `name` if nothing is using it and `unwanted()` (asked once no one can start to) agrees. */
+const drop = (name, unwanted) =>
+  navigator.locks.request(name, { ifAvailable: true }, async (free) => free && (await unwanted()) && caches.delete(name));
+
+const hex = (buffer) => Array.from(new Uint8Array(buffer), (b) => b.toString(16).padStart(2, "0")).join("");
+
+/**
+ * Keep every file of a build (an earlier partial download is resumed); resolves to its cache's
+ * name. The first file that fails cancels the others.
+ */
+function keep(version, files) {
+  const name = CACHE_PREFIX + version;
+  return using(name, async () => {
+    const cache = await caches.open(name);
+    await cache.delete(url(RETIRED)); // Back in use (a rollback).
+    if (await has(name, COMPLETE)) return name;
+    const cancel = new AbortController();
+    const results = await Promise.allSettled(
+      files.map(async ({ file, sha256 }) => {
+        try {
+          if (await cache.match(url(file))) return;
+          // `no-cache`: revalidate with the server, so a stale HTTP-cached page never mixes builds.
+          const response = await fetch(new Request(url(file), { cache: "no-cache" }), { signal: cancel.signal });
+          if (!response.ok) throw new Error(`${file}: HTTP ${response.status}`);
+          const body = await response.arrayBuffer();
+          if (hex(await crypto.subtle.digest("SHA-256", body)) !== sha256) throw new Error(`${file}: not this build's`);
+          await cache.put(url(file), new Response(body, { headers: response.headers }));
+        } catch (error) {
+          cancel.abort();
+          throw error;
+        }
+      }),
+    );
+    const failed = results.find((r) => r.status === "rejected");
+    if (failed) throw failed.reason;
+    await cache.put(url(COMPLETE), new Response(version));
+    return name;
+  });
+}
+
+const pageEntry = (id) => url(`~page/${encodeURIComponent(id)}`);
+
+/** Remember which build a page started. */
+async function started(id, build) {
+  if (!id) return;
+  const record = JSON.stringify({ build, at: Date.now() });
+  await (await caches.open(PAGES)).put(pageEntry(id), new Response(record));
+}
+
+/** The build a page started; a page started before it was remembered gets this worker's. */
+async function startedBy(id) {
+  const response = id ? await caches.match(pageEntry(id), { cacheName: PAGES }) : null;
+  return response ? (await response.json()).build : CACHE;
+}
+
+/** The builds open pages use (pages closed since are forgotten). */
+async function inUse() {
+  const open = new Set((await self.clients.matchAll({ includeUncontrolled: true })).map((c) => c.id));
+  const pages = await caches.open(PAGES);
+  const builds = new Set();
+  for (const request of await pages.keys()) {
+    const id = decodeURIComponent(request.url.split("~page/")[1] ?? "");
+    const record = await pages.match(request).then((r) => r?.json()).catch(() => null);
+    if (record && (open.has(id) || Date.now() - record.at < PAGE_LOADING_MS)) builds.add(record.build);
+    else await pages.delete(request);
+  }
+  return builds;
+}
+
+/** Drop unfinished downloads nothing is using, and replaced builds no open page uses. */
+async function sweep() {
+  for (const name of await caches.keys()) {
+    if (!name.startsWith(CACHE_PREFIX) || name === CACHE) continue;
+    await drop(name, async () => !(await has(name, COMPLETE)) || ((await has(name, RETIRED)) && !(await inUse()).has(name)));
+  }
+}
+
+self.addEventListener("install", (event) => {
+  // Clean up first: a page open for days sees updates (and failed ones) without any launch.
+  const install = () => sweep().catch(() => {}).then(() => keep(VERSION, FILES));
+  event.waitUntil(RETIRE ? self.skipWaiting() : install().then(() => self.skipWaiting()));
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    (async () => {
+      if (RETIRE) {
+        for (const name of await caches.keys()) if (name.startsWith(CACHE_PREFIX) || name === PAGES) await caches.delete(name);
+        return self.registration.unregister();
+      }
+      for (const name of await caches.keys()) {
+        if (name.startsWith(CACHE_PREFIX) && name !== CACHE) await (await caches.open(name)).put(url(RETIRED), new Response(""));
+      }
+      await sweep();
+      await self.clients.claim();
+    })(),
+  );
+});
+
+/** The promise's value, or null when it fails or takes longer than `ms`. */
+function within(ms, promise) {
+  return Promise.race([promise.catch(() => null), new Promise((resolve) => setTimeout(resolve, ms, null))]);
+}
+
+/** No app is deployed here any more (the server says `build.json` doesn't exist). */
+const GONE = "gone";
+
+/** The site wants a sign-in first (`build.json` is redirected, often to another origin, or refused). */
+const SIGN_IN = "sign-in";
+
+/** The deployed build's version and files, GONE, SIGN_IN, or null (unknown: offline, failing, invalid). */
+async function deployed() {
+  // `manual`: a redirect to another origin would only fail (CORS), looking like being offline.
+  const response = await fetch(url("build.json"), { cache: "no-cache", redirect: "manual" });
+  if (response.type === "opaqueredirect" || response.status === 401 || response.status === 403) return SIGN_IN;
+  if (response.status === 404 || response.status === 410) return GONE;
+  const build = response.ok ? await response.json() : null;
+  const valid = build && typeof build.version === "string" && Array.isArray(build.files);
+  return valid && build.files.every((f) => typeof f.file === "string" && typeof f.sha256 === "string") ? build : null;
+}
+
+/** Keep the worker alive for `promise` (allowed while the launch is being answered). */
+function extend(event, promise) {
+  try {
+    event.waitUntil(promise.catch(() => {}));
+  } catch {
+    // The event has ended; the work goes on while the worker runs.
+  }
+}
+
+/** A launch: the start page of a complete build (whatever query the URL has: `?sample`), and that build. */
+async function launch(event) {
+  const kept = await caches.match(url("index.html"), { cacheName: CACHE });
+  if (!kept) return [await fetch(event.request), NETWORK]; // Nothing kept yet (the first visit).
+  extend(event, sweep());
+  const build = await within(NAVIGATE_TIMEOUT_MS, deployed());
+  if (build === SIGN_IN) return [await fetch(event.request), NETWORK];
+  if (build === GONE) {
+    const page = await fetch(event.request).catch(() => null);
+    return page && page.ok ? [page, NETWORK] : [kept, CACHE];
+  }
+  if (!build || build.version === VERSION) return [kept, CACHE];
+  const download = keep(build.version, build.files);
+  extend(event, download);
+  const name = await within(UPDATE_TIMEOUT_MS, download);
+  const page = name && (await caches.match(url("index.html"), { cacheName: name }));
+  return page ? [page, name] : [kept, CACHE];
+}
+
+/**
+ * A launch that fails unexpectedly still starts the kept build (or asks the network). A newer
+ * worker only takes over once the launch has ended, by when its page is remembered (in use).
+ */
+async function launchOrKept(event) {
+  let page, build;
+  try {
+    [page, build] = await launch(event);
+  } catch {
+    page = await caches.match(url("index.html"), { cacheName: CACHE }).catch(() => null);
+    build = page ? CACHE : NETWORK;
+    page = page || (await fetch(event.request));
+  }
+  await started(event.resultingClientId, build).catch(() => {});
+  return page;
+}
+
+/** A page's files come from the build it started, else the network. */
+async function asset(event) {
+  const build = await startedBy(event.clientId).catch(() => CACHE);
+  const kept = build === NETWORK ? null : await caches.match(event.request, { cacheName: build, ignoreSearch: true });
+  return kept || fetch(event.request);
+}
+
+self.addEventListener("fetch", (event) => {
+  const request = event.request;
+  if (RETIRE || request.method !== "GET" || new URL(request.url).origin !== self.location.origin) return;
+  const path = request.url.split(/[?#]/)[0];
+  const start = request.mode === "navigate" && (path === url("") || path === url("index.html"));
+  event.respondWith(start ? launchOrKept(event) : asset(event));
+});

apps/solidcraft/Cargo.toml

@@ -7,23 +7,74 @@ license.workspace = true
 publish = false
 default-run = "solidcraft"
 
-[lints]
-workspace = true
+# The workspace lints, except unsafe_code: denied, not forbidden, so that src/open_documents.rs
+# (macOS file-open events), src/native_crash.rs (Windows exception filter) and src/native_frame.rs
+# (Windows resize border) can allow it: none has a safe API. Keep the rest in sync with [workspace.lints].
+[lints.rust]
+unsafe_code = "deny"
+
+[lints.clippy]
+dbg_macro = "warn"
+todo = "warn"
+too_many_arguments = "allow"
+type_complexity = "allow"
+neg_cmp_op_on_partial_ord = "allow"
 
 [dependencies]
 solidcraft-engine = { workspace = true }
 solidcraft-ui-egui = { workspace = true }
+solidcraft-space-mouse = { workspace = true }
 eframe = { workspace = true, features = ["default_fonts", "wgpu", "accesskit", "wayland", "x11", "links"] }
 egui = { workspace = true }
 serde_json = { workspace = true }
 log = { workspace = true }
 rfd = { workspace = true }
+# Checks eframe's settings file (app.ron) before eframe reads it (src/startup.rs).
+ron = "0.12"
+# Waits for wgpu's adapter list when choosing the graphics backend before the window opens.
+pollster = { workspace = true }
+getrandom = "0.3"
+# The update check (docs/updates.md): HTTPS with rustls, certificates from the operating system.
+ureq = { version = "3.4", default-features = false, features = ["rustls-no-provider", "platform-verifier"] }
+rustls = { version = "0.23", default-features = false, features = ["ring", "std", "tls12", "logging"] }
+# API keys of the agent chat's API agents (docs/agent-chat.md) live in the system keychain:
+# Keychain on macOS, Credential Manager on Windows, the Secret Service (pure-Rust D-Bus) elsewhere.
+keyring = { version = "3.6", default-features = false, features = ["apple-native", "windows-native", "async-secret-service", "async-io", "crypto-rust"] }
 
-[target.'cfg(any(target_os = "windows", target_os = "linux"))'.dependencies]
+[target.'cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))'.dependencies]
 quick-xml = { workspace = true }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 hidapi = { version = "2.6.7", default-features = false, features = ["windows-native"] }
+# The main window's handle for src/native_frame.rs (already in the tree through eframe and winit).
+raw-window-handle = "0.6"
+# Native crash capture (src/native_crash.rs): the exception filter, the faulting module, a minidump.
+# The window's resize border and DPI size (src/native_frame.rs): the window procedure, hit test, DPI.
+windows-sys = { version = "0.61", features = [
+    "Win32_Foundation",
+    "Win32_Security",
+    "Win32_Storage_FileSystem",
+    "Win32_System_Diagnostics_Debug",
+    "Win32_System_IO",
+    "Win32_System_Kernel",
+    "Win32_System_LibraryLoader",
+    "Win32_System_Memory",
+    "Win32_System_Threading",
+    "Win32_UI_HiDpi",
+    "Win32_UI_WindowsAndMessaging",
+] }
+
+[target.'cfg(target_os = "macos")'.dependencies]
+# The 3D mouse through the 3Dconnexion driver, which keeps the device to itself (src/space_mouse.rs).
+solidcraft-3dx-client = { workspace = true }
+# The 3D mouse (src/space_mouse.rs), in the shared-device open mode so that a running 3DxWare
+# driver does not shut the app out.
+hidapi = { version = "2.6.7", default-features = false, features = ["macos-shared-device"] }
+# Files opened from Finder and the Dock (src/open_documents.rs); all already come with eframe and rfd.
+objc2 = "0.6"
+objc2-app-kit = { version = "0.3", default-features = false, features = ["std", "NSApplication", "NSResponder"] }
+objc2-foundation = { version = "0.3", default-features = false, features = ["std", "block2", "NSArray", "NSNotification", "NSOperation", "NSString", "NSURL"] }
+block2 = "0.6"
 
 [target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
 winit = { version = "0.30", default-features = false, features = ["x11"] }

apps/solidcraft/build.rs

@@ -1,61 +1,17 @@
 #![forbid(unsafe_code)]
-#[path = "../app_icon.rs"]
-mod app_icon;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    println!("cargo:rerun-if-changed=../app_icon.rs");
+    let icon = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("../../assets/icons/app/windows/exports/solidcraft-executable.ico");
+    println!("cargo:rerun-if-changed={}", icon.display());
     println!("cargo:rerun-if-changed=build.rs");
     if std::env::var("CARGO_CFG_TARGET_OS")? != "windows" {
         return Ok(());
     }
     let out = std::path::PathBuf::from(std::env::var_os("OUT_DIR").ok_or("missing OUT_DIR")?);
-    let sizes = [16usize, 24, 32, 48, 64, 128, 256];
-    let mut images = Vec::new();
-    for size in sizes {
-        let rgba = app_icon::rgba(size)?;
-        // ICO DIB: bottom-up BGRA plus a padded one-bit transparency mask.
-        let mask_stride = size.div_ceil(32) * 4;
-        let mut dib = Vec::new();
-        dib.extend_from_slice(&40u32.to_le_bytes());
-        dib.extend_from_slice(&(size as i32).to_le_bytes());
-        dib.extend_from_slice(&((size * 2) as i32).to_le_bytes());
-        dib.extend_from_slice(&1u16.to_le_bytes());
-        dib.extend_from_slice(&32u16.to_le_bytes());
-        dib.extend_from_slice(&[0; 24]);
-        for row in rgba.chunks_exact(size * 4).rev() {
-            for p in row.as_chunks::<4>().0.iter() {
-                dib.extend_from_slice(&[p[2], p[1], p[0], p[3]]);
-            }
-        }
-        for row in rgba.chunks_exact(size * 4).rev() {
-            let mut mask = vec![0u8; mask_stride];
-            for (x, p) in row.as_chunks::<4>().0.iter().enumerate() {
-                if p[3] == 0 {
-                    mask[x / 8] |= 0x80 >> (x % 8);
-                }
-            }
-            dib.extend_from_slice(&mask);
-        }
-        images.push((size, dib));
-    }
-    let mut ico = vec![0, 0, 1, 0];
-    ico.extend_from_slice(&(images.len() as u16).to_le_bytes());
-    let mut offset = 6 + 16 * images.len();
-    for (size, data) in &images {
-        let dim = if *size == 256 { 0 } else { *size as u8 };
-        ico.extend_from_slice(&[dim, dim, 0, 0, 1, 0, 32, 0]);
-        ico.extend_from_slice(&(data.len() as u32).to_le_bytes());
-        ico.extend_from_slice(&(offset as u32).to_le_bytes());
-        offset += data.len();
-    }
-    for (_, data) in images {
-        ico.extend_from_slice(&data);
-    }
-    let icon = out.join("solidcraft.ico");
-    std::fs::write(&icon, ico)?;
+    let copy = out.join("solidcraft.ico");
+    std::fs::copy(icon, &copy)?;
     let rc = out.join("solidcraft.rc");
-    std::fs::write(&rc, format!("1 ICON \"{}\"\n", icon.display().to_string().replace('\\', "/")))?;
-    // Missing resource tools are a build error, rather than silently shipping a generic icon.
+    std::fs::write(&rc, format!("1 ICON \"{}\"\n", copy.display().to_string().replace('\\', "/")))?;
     embed_resource::compile_for(&rc, ["solidcraft"], embed_resource::NONE).manifest_required()?;
     Ok(())
 }

apps/solidcraft/src/control_server.rs

@@ -4,31 +4,94 @@
 use std::io::{BufRead, BufReader, Write};
 use std::net::{TcpListener, TcpStream};
 use std::sync::atomic::{AtomicUsize, Ordering};
-use std::sync::mpsc::{Receiver, Sender, channel};
+use std::sync::mpsc::{Receiver, Sender, TryRecvError, channel};
 use std::time::Duration;
 
 use serde_json::{Value, json};
 use solidcraft_engine::MAX_LINE;
+use solidcraft_engine::control_auth;
 use solidcraft_ui_egui::ControlRequest;
 
-/// Connections served at once. The channel has no authentication beyond being bound to
-/// loopback, so a flood must not be able to spawn threads without end.
+/// Connections served at once, so a flood must not be able to spawn threads without end.
 const MAX_CONNECTIONS: usize = 16;
 /// Lines that are not JSON before the connection is closed, so garbage cannot loop forever.
 const MAX_BAD_LINES: usize = 8;
 
 static OPEN: AtomicUsize = AtomicUsize::new(0);
+/// The token files this launch wrote (its `--control` port, the agent chat's endpoint), removed
+/// when the app ends.
+static TOKEN_FILES: std::sync::Mutex<Vec<std::path::PathBuf>> = std::sync::Mutex::new(Vec::new());
+
+/// A new random token: 32 bytes from the operating system, as hex.
+fn new_token() -> Option<String> {
+    let mut bytes = [0u8; 32];
+    getrandom::fill(&mut bytes).ok()?;
+    Some(bytes.iter().map(|b| format!("{b:02x}")).collect())
+}
+
+/// Remove this launch's token file (at exit).
+pub fn remove_token_file() {
+    if let Ok(files) = TOKEN_FILES.lock() {
+        for p in files.iter() {
+            let _ = std::fs::remove_file(p);
+        }
+    }
+}
 
 pub fn start(port: u16, ctx: egui::Context) -> Receiver<ControlRequest> {
     let (tx, rx) = channel::<ControlRequest>();
+    // Every connection must show the token before anything runs (docs/control-protocol.md).
+    match control_auth::env_token().or_else(new_token) {
+        Some(token) => {
+            listen(port, token, tx, ctx, false);
+        }
+        None => eprintln!("solidcraft: control server not started: no random token available"),
+    }
+    rx
+}
+
+/// The agent chat's own endpoint for its agent's MCP server (docs/agent-chat.md): a free loopback
+/// port with a fresh token of its own (never `SOLIDCRAFT_CONTROL_TOKEN`), written to the usual
+/// token file, where the MCP server finds it, so the token never passes through the agent. Its
+/// requests go to `tx`, where the chat's gate reads them; one may wait long for the user's Allow.
+pub fn listen_agent(tx: Sender<ControlRequest>, ctx: egui::Context) -> Option<u16> {
+    let Some(token) = new_token() else {
+        eprintln!("solidcraft: agent chat endpoint not started: no random token available");
+        return None;
+    };
+    listen(0, token, tx, ctx, true)
+}
+
+/// Listen on `port` (0: a free port the system picks) with `token`; the port it listens on.
+/// `patient`: every request may wait as long as a batch (a person decides on it).
+fn listen(port: u16, token: String, tx: Sender<ControlRequest>, ctx: egui::Context, patient: bool) -> Option<u16> {
     let listener = match TcpListener::bind(("127.0.0.1", port)) {
         Ok(l) => l,
         Err(e) => {
             eprintln!("solidcraft: control server failed to bind 127.0.0.1:{port}: {e}");
-            return rx;
+            return None;
         }
     };
-    eprintln!("solidcraft: control server listening on 127.0.0.1:{port}");
+    let port = listener.local_addr().map(|a| a.port()).unwrap_or(port);
+    match control_auth::token_path(port) {
+        Some(path) => match control_auth::write_token_file(&path, &token) {
+            Ok(()) => {
+                eprintln!("solidcraft: control server listening on 127.0.0.1:{port} (token in {})", path.display());
+                if let Ok(mut files) = TOKEN_FILES.lock() {
+                    files.push(path);
+                }
+            }
+            Err(e) => eprintln!(
+                "solidcraft: control server listening on 127.0.0.1:{port}, but its token file {} could not be written ({e}); \
+                 clients need SOLIDCRAFT_CONTROL_TOKEN",
+                path.display()
+            ),
+        },
+        None => {
+            eprintln!("solidcraft: control server listening on 127.0.0.1:{port}; no data folder for its token, clients need SOLIDCRAFT_CONTROL_TOKEN")
+        }
+    }
+    let token = std::sync::Arc::new(token);
     std::thread::spawn(move || {
         for stream in listener.incoming().flatten() {
             if OPEN.fetch_add(1, Ordering::Relaxed) >= MAX_CONNECTIONS {
@@ -39,13 +102,14 @@ pub fn start(port: u16, ctx: egui::Context) -> Receiver<ControlRequest> {
             }
             let tx = tx.clone();
             let ctx = ctx.clone();
+            let token = token.clone();
             std::thread::spawn(move || {
-                serve(stream, tx, ctx);
+                serve(stream, &token, tx, ctx, patient);
                 OPEN.fetch_sub(1, Ordering::Relaxed);
             });
         }
     });
-    rx
+    Some(port)
 }
 
 /// One line without its newline, or `None` at the end of the stream. A client that sends
@@ -80,11 +144,51 @@ fn read_line(r: &mut impl BufRead, max: usize) -> std::io::Result<Option<Vec<u8>
     }
 }
 
-fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
+/// The reply to a connection that didn't show the token; the connection is then closed.
+fn unauthorized() -> Value {
+    json!({"ok": false, "error": "unauthorized: send the control token as \"token\" (see docs/control-protocol.md)"})
+}
+
+/// Refuse the connection: the reply, then the end of what we send, then what the client had
+/// already sent read and dropped (a little, briefly). Closing a socket with unread input resets
+/// the connection, and a reset can reach the client before it has read the refusal.
+fn refuse(out: &mut TcpStream, reader: &mut BufReader<TcpStream>) {
+    use std::io::Read;
+    let _ = writeln!(out, "{}", unauthorized());
+    let _ = out.shutdown(std::net::Shutdown::Write);
+    let _ = reader.get_ref().set_read_timeout(Some(Duration::from_millis(500)));
+    let _ = std::io::copy(&mut reader.by_ref().take(64 * 1024), &mut std::io::sink());
+}
+
+/// How long a request waits for the app's reply: most requests, and a batch (or every request,
+/// on a patient connection).
+#[derive(Clone, Copy)]
+struct Waits {
+    short: Duration,
+    long: Duration,
+}
+
+const WAITS: Waits = Waits { short: Duration::from_secs(60), long: Duration::from_secs(3600) };
+
+/// A request that timed out but is still running in the app (#1618): its id and method, and where
+/// its reply will land.
+struct Pending {
+    id: Value,
+    method: String,
+    reply: Receiver<Value>,
+}
+
+fn serve(stream: TcpStream, token: &str, tx: Sender<ControlRequest>, ctx: egui::Context, patient: bool) {
+    serve_with(stream, token, tx, ctx, patient, WAITS);
+}
+
+fn serve_with(stream: TcpStream, token: &str, tx: Sender<ControlRequest>, ctx: egui::Context, patient: bool, waits: Waits) {
     let Ok(read) = stream.try_clone() else { return };
     let mut out = stream;
     let mut reader = BufReader::new(read);
     let mut bad = 0usize;
+    let mut authenticated = false;
+    let mut pending: Option<Pending> = None;
     loop {
         let line = match read_line(&mut reader, MAX_LINE) {
             Ok(Some(l)) => String::from_utf8_lossy(&l).into_owned(),
@@ -99,20 +203,68 @@ fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
         }
         let reply = match serde_json::from_str::<Value>(&line) {
             Ok(msg) => {
+                // The first request must carry the token; later ones on the same connection may.
+                if !authenticated {
+                    match msg.get("token").and_then(Value::as_str) {
+                        Some(t) if control_auth::tokens_match(t, token) => authenticated = true,
+                        _ => {
+                            refuse(&mut out, &mut reader);
+                            break;
+                        }
+                    }
+                }
                 let id = msg.get("id").cloned().unwrap_or(Value::Null);
                 let method = msg.get("method").and_then(Value::as_str).unwrap_or("").to_string();
                 let params = msg.get("params").cloned().unwrap_or(json!({}));
-                let (req, rrx) = ControlRequest::new(method, params);
-                if tx.send(req).is_err() {
-                    break;
-                }
-                ctx.request_repaint();
-                let mut r = rrx.recv_timeout(Duration::from_secs(60)).unwrap_or_else(|_| json!({"ok": false, "error": "timeout"}));
+                // A request that timed out may have finished since (#1618).
+                let late = pending.as_ref().and_then(|p| match p.reply.try_recv() {
+                    Ok(reply) => Some(reply),
+                    Err(TryRecvError::Disconnected) => Some(json!({"ok": false, "error": "the app ended the request without a reply"})),
+                    Err(TryRecvError::Empty) => None,
+                });
+                let mut r = if method == "control.pending" {
+                    match (pending.take(), late) {
+                        (None, _) => json!({"ok": true, "result": {"pending": null}}),
+                        (Some(p), Some(reply)) => json!({"ok": true, "result": {"pending": p.id, "method": p.method, "done": true, "reply": reply}}),
+                        (Some(p), None) => {
+                            let r = json!({"ok": true, "result": {"pending": p.id, "method": p.method, "done": false}});
+                            pending = Some(p);
+                            r
+                        }
+                    }
+                } else if let Some(p) = pending.as_ref().filter(|_| late.is_none()) {
+                    // Nothing more is queued behind it, to run unseen when it ends.
+                    json!({"ok": false, "busy": true, "error": format!("busy: request {} (`{}`) is still running; ask `control.pending` for its result", p.id, p.method)})
+                } else {
+                    if late.is_some() {
+                        // Finished, and the client moved on without asking: it is dropped.
+                        pending = None;
+                    }
+                    // A batch replaces many short requests: the whole of it may take long (#743).
+                    let wait = if patient || method == "engine.batch" { waits.long } else { waits.short };
+                    let (req, rrx) = ControlRequest::new(method.clone(), params);
+                    if tx.send(req).is_err() {
+                        break;
+                    }
+                    ctx.request_repaint();
+                    match rrx.recv_timeout(wait) {
+                        Ok(r) => r,
+                        Err(_) => {
+                            let r = json!({"ok": false, "running": true, "error": format!("timeout: `{method}` is still running in the app and will still apply; ask `control.pending` for its result")});
+                            pending = Some(Pending { id: id.clone(), method, reply: rrx });
+                            r
+                        }
+                    }
+                };
                 if let Some(o) = r.as_object_mut() {
                     o.insert("id".into(), id);
                 }
                 r
             }
+            Err(_) if !authenticated => {
+                refuse(&mut out, &mut reader);
+                break;
+            }
             Err(e) => {
                 bad += 1;
                 json!({"ok": false, "error": format!("bad JSON: {e}")})
@@ -131,6 +283,128 @@ fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
 mod tests {
     use super::*;
 
+    /// #1618: a request that outlasts its wait says it is still running; the connection keeps its
+    /// reply for `control.pending`, and refuses other requests as `busy` until it lands, so none
+    /// is queued to run unseen behind it.
+    #[test]
+    fn a_timed_out_request_can_be_asked_for_later() {
+        let token = "0123456789abcdef0123456789abcdef";
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let addr = listener.local_addr().unwrap();
+        let (tx, rx) = channel::<ControlRequest>();
+        // The slow request is held until the test has seen it time out, so the test does not
+        // race the clock on a loaded machine.
+        let (gate_tx, gate_rx) = channel::<()>();
+        let ran = std::sync::Arc::new(std::sync::Mutex::new(Vec::<String>::new()));
+        let seen = ran.clone();
+        std::thread::spawn(move || {
+            for req in rx {
+                seen.lock().unwrap().push(req.method.clone());
+                if req.method == "slow" {
+                    let _ = gate_rx.recv();
+                }
+                let _ = req.reply.send(json!({"ok": true, "result": req.method}));
+            }
+        });
+        let waits = Waits { short: Duration::from_millis(100), long: Duration::from_millis(100) };
+        std::thread::spawn(move || {
+            if let Some(stream) = listener.incoming().flatten().next() {
+                serve_with(stream, token, tx, egui::Context::default(), false, waits);
+            }
+        });
+        let s = TcpStream::connect(addr).unwrap();
+        s.set_read_timeout(Some(Duration::from_secs(10))).unwrap();
+        let mut out = s.try_clone().unwrap();
+        let mut lines = BufReader::new(s);
+        let mut ask = |v: Value| -> Value {
+            writeln!(out, "{v}").unwrap();
+            let mut l = String::new();
+            lines.read_line(&mut l).unwrap();
+            serde_json::from_str(&l).unwrap()
+        };
+        let r = ask(json!({"id": 1, "method": "slow", "token": token}));
+        assert!(r["ok"] == false && r["running"] == true && r["error"].as_str().is_some_and(|e| e.starts_with("timeout")), "{r}");
+        let r = ask(json!({"id": 2, "method": "ui.view"}));
+        assert!(r["busy"] == true && r["id"] == 2, "{r}");
+        let r = ask(json!({"id": 3, "method": "control.pending"}));
+        assert_eq!((&r["result"]["pending"], &r["result"]["done"]), (&json!(1), &json!(false)), "{r}");
+        gate_tx.send(()).unwrap();
+        let deadline = std::time::Instant::now() + Duration::from_secs(10);
+        let r = loop {
+            let r = ask(json!({"id": 4, "method": "control.pending"}));
+            if r["result"]["done"] == true || std::time::Instant::now() > deadline {
+                break r;
+            }
+            std::thread::sleep(Duration::from_millis(10));
+        };
+        assert_eq!(
+            (&r["result"]["pending"], &r["result"]["done"], &r["result"]["reply"]["result"]),
+            (&json!(1), &json!(true), &json!("slow")),
+            "{r}"
+        );
+        let r = ask(json!({"id": 5, "method": "control.pending"}));
+        assert_eq!(r["result"]["pending"], Value::Null, "{r}");
+        let r = ask(json!({"id": 6, "method": "ui.view"}));
+        assert_eq!((&r["ok"], &r["result"]), (&json!(true), &json!("ui.view")), "{r}");
+        assert_eq!(*ran.lock().unwrap(), ["slow", "ui.view"], "the busy request never reached the app");
+    }
+
+    /// #205: a connection runs nothing until a request carries the launch's token; a wrong or
+    /// missing token, or garbage, is refused and the connection closed. Once shown, the token
+    /// need not be repeated on that connection.
+    #[test]
+    fn requests_run_only_after_the_token() {
+        use std::io::Read;
+        let token = "0123456789abcdef0123456789abcdef";
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let addr = listener.local_addr().unwrap();
+        let (tx, rx) = channel::<ControlRequest>();
+        let ran = std::sync::Arc::new(std::sync::Mutex::new(Vec::<String>::new()));
+        let seen = ran.clone();
+        std::thread::spawn(move || {
+            for req in rx {
+                seen.lock().unwrap().push(req.method.clone());
+                let _ = req.reply.send(json!({"ok": true, "result": null}));
+            }
+        });
+        std::thread::spawn(move || {
+            for stream in listener.incoming().flatten() {
+                let tx = tx.clone();
+                std::thread::spawn(move || serve(stream, token, tx, egui::Context::default(), false));
+            }
+        });
+        let session = |lines: &[String]| {
+            let mut s = TcpStream::connect(addr).unwrap();
+            s.set_read_timeout(Some(Duration::from_secs(10))).unwrap();
+            for l in lines {
+                let _ = writeln!(s, "{l}");
+            }
+            let _ = s.shutdown(std::net::Shutdown::Write);
+            let mut text = String::new();
+            let _ = s.read_to_string(&mut text);
+            text.lines().map(|l| serde_json::from_str::<Value>(l).unwrap()).collect::<Vec<_>>()
+        };
+        for first in [
+            json!({"id": 1, "method": "app.quit", "params": {"force": true}}).to_string(),
+            json!({"id": 1, "method": "app.quit", "token": "0123456789abcdef0123456789abcdee"}).to_string(),
+            json!({"id": 1, "method": "app.quit", "token": "0123"}).to_string(),
+            json!({"id": 1, "method": "app.quit", "token": 7}).to_string(),
+            "not json".to_string(),
+        ] {
+            let replies = session(&[first.clone(), json!({"id": 2, "method": "app.quit", "token": token}).to_string()]);
+            assert_eq!(replies.len(), 1, "{first}: closed after refusing: {replies:?}");
+            assert!(replies[0]["error"].as_str().is_some_and(|e| e.starts_with("unauthorized")), "{first}: {replies:?}");
+        }
+        assert!(ran.lock().unwrap().is_empty(), "nothing ran without the token");
+        let replies = session(&[
+            json!({"id": 1, "method": "ui.inspect", "token": token}).to_string(),
+            json!({"id": 2, "method": "engine.commands"}).to_string(),
+        ]);
+        assert_eq!(replies.len(), 2, "{replies:?}");
+        assert!(replies.iter().all(|r| r["ok"] == true), "{replies:?}");
+        assert_eq!(*ran.lock().unwrap(), ["ui.inspect", "engine.commands"]);
+    }
+
     /// A request longer than the cap is refused instead of allocated.
     #[test]
     fn lines_past_the_cap_are_refused() {

apps/solidcraft/src/main.rs

@@ -1,35 +1,60 @@
 //! SolidCraft desktop app.
 //!
-//! Usage: `solidcraft [--control <port>] [--sample] [--crash-log] [design.solidcraft | part.step]`
+//! Usage: `solidcraft [--control <port>] [--sample] [--crash-log] [--safe-mode] [design.solidcraft | part.step]`
+//!
+//! `--safe-mode` (or `SOLIDCRAFT_SAFE_MODE=1`) starts with default settings, no recovery offer and
+//! the software renderer; see `startup` and docs/book/src/guide/troubleshooting.md.
 //!
 //! A `.step`/`.stp` file opens as a new design holding the file's bodies (an Import feature); a
-//! `.3mf`/`.stl` file as a new design holding mesh bodies.
+//! `.3mf`/`.stl`/`.obj`/`.glb`/`.gltf` file as a new design holding mesh bodies.
 //!
 //! `--control <port>` (or `SOLIDCRAFT_CONTROL_PORT`) starts a localhost JSON-lines control
 //! server: `{"id":1,"method":"engine.execute","params":{"command":"solid.box","params":{…}}}`.
 //! See `solidcraft_ui_egui::control` and docs/control-protocol.md.
 #![cfg_attr(all(target_os = "windows", not(debug_assertions)), windows_subsystem = "windows")]
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
-#![forbid(unsafe_code)]
+#![deny(unsafe_code)]
 
 #[cfg(not(target_os = "macos"))]
-#[path = "../../app_icon.rs"]
+#[path = "../../../assets/icons/app/shared/source/app_icon.rs"]
 mod app_icon;
 mod control_server;
-#[cfg(any(target_os = "windows", target_os = "linux"))]
+#[cfg(target_os = "windows")]
+mod native_crash;
+#[cfg(target_os = "windows")]
+mod native_frame;
+#[cfg(target_os = "macos")]
+mod open_documents;
+#[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
 mod space_mouse;
+mod startup;
 
 use solidcraft_engine::{Session, io};
 use solidcraft_ui_egui::{Services, SolveApp};
 
 struct App {
     solve: SolveApp,
-    #[cfg(any(target_os = "windows", target_os = "linux"))]
+    /// The settings folder whose start marker the first frame clears (`startup::started`).
+    starting: Option<std::path::PathBuf>,
+    /// Frames begun; the second one means the first was drawn (startup is over).
+    frames: u32,
+    #[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
     space_mouse: space_mouse::SpaceMouse,
 }
 
 impl eframe::App for App {
     fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        if self.frames < 2 {
+            self.frames += 1;
+            // A second frame right away, which means the first was presented: the app is up.
+            ctx.request_repaint();
+            if self.frames == 2 {
+                solidcraft_engine::crash::phase(solidcraft_engine::crash::RUNNING);
+                if let Some(dir) = self.starting.take() {
+                    startup::started(&dir);
+                }
+            }
+        }
         // The design on screen is the one whose commands a crash report replays.
         self.solve.session.crash_journal = solidcraft_engine::crash::enabled();
         // The OS closing the window (Alt+F4, Cmd+Q, the window manager): ask about unsaved
@@ -38,14 +63,23 @@ impl eframe::App for App {
             ctx.send_viewport_cmd(egui::ViewportCommand::CancelClose);
             solidcraft_ui_egui::documents::request_quit(&mut self.solve);
         }
+        #[cfg(target_os = "macos")]
+        for f in if self.solve.file_picker_busy() { Vec::new() } else { open_documents::take() } {
+            self.solve.open_path_async(&f);
+        }
         self.solve.logic(ctx);
-        #[cfg(any(target_os = "windows", target_os = "linux"))]
-        self.space_mouse.tick(&mut self.solve, ctx);
+        #[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
+        if !self.solve.file_picker_busy() {
+            self.space_mouse.tick(&mut self.solve, ctx);
+        }
         if self.solve.quit_requested {
             ctx.send_viewport_cmd(egui::ViewportCommand::Close);
         }
     }
     fn raw_input_hook(&mut self, _ctx: &egui::Context, raw: &mut egui::RawInput) {
+        // Before the app's own hook, which adds the control channel's events.
+        #[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
+        self.space_mouse.raw_input_hook(self.solve.preferences.space_mouse_enabled, raw);
         self.solve.raw_input_hook(raw);
     }
     fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
@@ -55,17 +89,48 @@ impl eframe::App for App {
         storage.set_string(solidcraft_ui_egui::prefs::STORAGE_KEY, self.solve.prefs());
     }
     fn on_exit(&mut self) {
+        // The agent chat's agent and everything it started end with the app.
+        solidcraft_ui_egui::agent_chat::shutdown(&mut self.solve);
+        // A save still being written ends before the app does.
+        solidcraft_ui_egui::save_job::tick(&mut self.solve, true);
         solidcraft_ui_egui::recovery_ui::close(&mut self.solve);
         solidcraft_engine::crash::end_session();
+        // An update asked to restart into the new version or to run its installer.
+        if let Some((program, args)) = solidcraft_ui_egui::update::take_launch(&mut self.solve) {
+            let mut command = std::process::Command::new(&program);
+            command.args(&args);
+            #[cfg(windows)]
+            {
+                use std::os::windows::process::CommandExt;
+                // Not tied to this process: its own process group, and no console (the PowerShell
+                // that waits for an installer is hidden; the app itself is detached).
+                let hidden_shell = program.file_stem().is_some_and(|n| n.eq_ignore_ascii_case("powershell"));
+                command.creation_flags(0x0000_0200 | if hidden_shell { 0x0800_0000 } else { 0x0000_0008 });
+            }
+            if let Err(e) = command.spawn() {
+                log::error!("update: starting {}: {e}", program.display());
+            }
+        }
     }
 }
 
-fn services() -> Services {
+fn services(cc: &eframe::CreationContext<'_>) -> Services {
+    let parent = rfd::AsyncFileDialog::new().set_parent(cc);
+    let open_parent = parent.clone();
+    let program_parent = parent.clone();
+    let file_parent = parent.clone();
     Services {
-        pick_open: Some(Box::new(|| {
-            rfd::FileDialog::new()
+        pick_open: Some(Box::new(move |first: &[&str]| {
+            // The file type the command reads comes first, so the picker opens on it (#1801).
+            let mut dialog = open_parent.clone();
+            if !first.is_empty() {
+                let label = first.iter().map(|e| e.to_uppercase()).collect::<Vec<_>>().join(", ");
+                let both: Vec<String> = first.iter().flat_map(|e| [e.to_lowercase(), e.to_uppercase()]).collect();
+                dialog = dialog.add_filter(label, &both);
+            }
+            let future = dialog
                 .add_filter(
-                    "Designs, STEP, IGES and meshes",
+                    "Designs, CAD files and meshes",
                     &[
                         io::DESIGN_EXT,
                         io::LEGACY_DESIGN_EXT,
@@ -78,23 +143,56 @@ fn services() -> Services {
                         "iges",
                         "IGS",
                         "IGES",
+                        "FCStd",
+                        "fcstd",
+                        "3dm",
+                        "3DM",
                         "3mf",
                         "3MF",
                         "stl",
                         "STL",
+                        "obj",
+                        "OBJ",
+                        "glb",
+                        "GLB",
+                        "gltf",
+                        "GLTF",
                     ],
                 )
                 .add_filter("SolidCraft design (container or JSON)", &[io::DESIGN_EXT, io::LEGACY_DESIGN_EXT, "json"])
                 .add_filter("STEP", &["step", "stp", "STEP", "STP"])
                 .add_filter("IGES", &["igs", "iges", "IGS", "IGES"])
-                .add_filter("Mesh (3MF, STL)", &["3mf", "3MF", "stl", "STL"])
+                .add_filter("FreeCAD and Rhino", &["FCStd", "fcstd", "3dm", "3DM"])
+                .add_filter("Mesh (3MF, STL, OBJ, glTF)", &["3mf", "3MF", "stl", "STL", "obj", "OBJ", "glb", "GLB", "gltf", "GLTF"])
                 .add_filter("Sketch drawings (DXF, SVG)", &["dxf", "DXF", "svg", "SVG"])
                 .add_filter("All files", &["*"])
-                .pick_file()
-                .map(|p| p.to_string_lossy().to_string())
+                .pick_file();
+            Box::pin(async move { future.await.map(|p| p.path().to_string_lossy().into_owned()) })
         })),
-        pick_save: Some(Box::new(|name: &str, exts: &[&str]| {
-            let dialog = rfd::FileDialog::new().set_file_name(name);
+        // One kind of file (the agent chat's attachments): only the types it names, as given and in
+        // lower and upper case (Linux dialogs match case; macOS allows just the listed types).
+        pick_file: Some(Box::new(move |label: &str, exts: &[&str]| {
+            let mut all: Vec<String> = Vec::new();
+            for e in exts {
+                for v in [e.to_string(), e.to_ascii_lowercase(), e.to_ascii_uppercase()] {
+                    if !all.contains(&v) {
+                        all.push(v);
+                    }
+                }
+            }
+            let all: Vec<&str> = all.iter().map(String::as_str).collect();
+            // Any other file attaches by reference, so the list is not the only choice.
+            let future = file_parent.clone().add_filter(label, &all).add_filter("All files", &["*"]).pick_file();
+            Box::pin(async move { future.await.map(|p| p.path().to_string_lossy().into_owned()) })
+        })),
+        pick_program: Some(Box::new(move || {
+            let dialog = program_parent.clone().set_title("Choose your slicer");
+            let dialog = if cfg!(target_os = "windows") { dialog.add_filter("Programs", &["exe"]) } else { dialog };
+            let future = dialog.pick_file();
+            Box::pin(async move { future.await.map(|p| p.path().to_string_lossy().into_owned()) })
+        })),
+        pick_save: Some(Box::new(move |name: &str, exts: &[&str]| {
+            let dialog = parent.clone().set_file_name(name);
             let dialog = if exts == [io::DESIGN_EXT, "json"] {
                 if name.ends_with(".json") {
                     dialog.add_filter("Plain JSON design", &["json"]).add_filter("SolidCraft container", &[io::DESIGN_EXT])
@@ -104,9 +202,18 @@ fn services() -> Services {
             } else {
                 dialog.add_filter("File", exts)
             };
-            dialog.save_file().map(|p| p.to_string_lossy().to_string())
+            let future = dialog.save_file();
+            Box::pin(async move { future.await.map(|p| p.path().to_string_lossy().into_owned()) })
         })),
         graphics_path: graphics_path().map(|p| p.to_string_lossy().to_string()),
+        http_get: Some(std::sync::Arc::new(http_get)),
+        http_download: Some(std::sync::Arc::new(http_download)),
+        // Already an installed app: only the browser build offers to install.
+        install_app: None,
+        download_design: None,
+        browser_files: None,
+        agent_http: Some(std::sync::Arc::new(agent_http)),
+        secrets: Some(std::sync::Arc::new(Keychain)),
         show_in_folder: Some(Box::new(|path| {
             let folder = std::path::Path::new(path).parent().unwrap_or_else(|| std::path::Path::new("."));
             let mut command = std::process::Command::new(if cfg!(target_os = "windows") {
@@ -127,6 +234,144 @@ fn services() -> Services {
     }
 }
 
+/// HTTPS GET for the update check (docs/updates.md): certificates from the operating system, a
+/// 15 s limit, at most 1 MB, and no headers beyond what GitHub requires (a User-Agent without
+/// the version or anything about this machine, and the API's media type).
+fn http_get(url: &str) -> Result<Vec<u8>, solidcraft_ui_egui::update::FetchError> {
+    use solidcraft_ui_egui::update::FetchError;
+    let mut response = http_call(url, std::time::Duration::from_secs(15))?;
+    response.body_mut().with_config().limit(1 << 20).read_to_vec().map_err(|e| FetchError::Failed(e.to_string()))
+}
+
+/// HTTPS download of an update package to `to` (docs/updates.md), reporting progress; stops when
+/// `progress` returns false. The caller verifies the file.
+fn http_download(url: &str, to: &std::path::Path, progress: &dyn Fn(u64, Option<u64>) -> bool) -> Result<(), solidcraft_ui_egui::update::FetchError> {
+    use solidcraft_ui_egui::update::FetchError;
+    use std::io::{Read, Write};
+    let fail = |e: String| FetchError::Failed(e);
+    let mut response = http_call(url, std::time::Duration::from_secs(30 * 60))?;
+    let total = response.headers().get("content-length").and_then(|v| v.to_str().ok()).and_then(|v| v.parse::<u64>().ok());
+    let mut body = response.body_mut().with_config().limit(solidcraft_ui_egui::update::install::MAX_PACKAGE).reader();
+    let mut file = std::fs::File::create(to).map_err(|e| fail(format!("{}: {e}", to.display())))?;
+    let mut buf = vec![0u8; 1 << 16];
+    let mut done = 0u64;
+    loop {
+        let n = body.read(&mut buf).map_err(|e| fail(e.to_string()))?;
+        if n == 0 {
+            break;
+        }
+        file.write_all(buf.get(..n).unwrap_or_default()).map_err(|e| fail(format!("{}: {e}", to.display())))?;
+        done += n as u64;
+        if !progress(done, total) {
+            return Err(fail("cancelled".into()));
+        }
+    }
+    file.sync_all().map_err(|e| fail(format!("{}: {e}", to.display())))?;
+    Ok(())
+}
+
+/// HTTP for the agent chat's API agents (OpenAI-compatible endpoints, docs/agent-chat.md): to the
+/// URL the user configured, which may be plain HTTP on this computer (Ollama, LM Studio). No
+/// redirects (a key must not follow one elsewhere), at most 16 MB back.
+fn agent_http(r: &solidcraft_ui_egui::agent_chat::backend::HttpRequest) -> Result<(u16, Vec<u8>), String> {
+    use std::time::Duration;
+    let tls = ureq::tls::TlsConfig::builder()
+        .root_certs(ureq::tls::RootCerts::PlatformVerifier)
+        .unversioned_rustls_crypto_provider(std::sync::Arc::new(rustls::crypto::ring::default_provider()))
+        .build();
+    let agent: ureq::Agent = ureq::Agent::config_builder()
+        .tls_config(tls)
+        .http_status_as_error(false)
+        .timeout_global(Some(Duration::from_secs(r.timeout_s.clamp(1, 900))))
+        .timeout_connect(Some(Duration::from_secs(10)))
+        .user_agent("SolidCraft")
+        .max_redirects(0)
+        .build()
+        .into();
+    let mut response = if r.method == "POST" {
+        let mut req = agent.post(&r.url);
+        for (k, v) in &r.headers {
+            req = req.header(k, v);
+        }
+        req.send(r.body.as_deref().unwrap_or_default())
+    } else {
+        let mut req = agent.get(&r.url);
+        for (k, v) in &r.headers {
+            req = req.header(k, v);
+        }
+        req.call()
+    }
+    .map_err(|e| e.to_string())?;
+    let status = response.status().as_u16();
+    let body = response.body_mut().with_config().limit(16 << 20).read_to_vec().map_err(|e| e.to_string())?;
+    Ok((status, body))
+}
+
+/// API keys in the system keychain (service "SolidCraft agent chat", one entry per agent).
+struct Keychain;
+
+impl Keychain {
+    fn entry(id: &str) -> Result<keyring::Entry, String> {
+        keyring::Entry::new("SolidCraft agent chat", id).map_err(|e| e.to_string())
+    }
+}
+
+impl solidcraft_ui_egui::agent_chat::backend::Secrets for Keychain {
+    fn get(&self, id: &str) -> Result<Option<String>, String> {
+        match Self::entry(id)?.get_password() {
+            Ok(p) => Ok(Some(p)),
+            Err(keyring::Error::NoEntry) => Ok(None),
+            Err(e) => Err(e.to_string()),
+        }
+    }
+    fn set(&self, id: &str, secret: &str) -> Result<(), String> {
+        Self::entry(id)?.set_password(secret).map_err(|e| e.to_string())
+    }
+    fn delete(&self, id: &str) -> Result<(), String> {
+        match Self::entry(id)?.delete_credential() {
+            Ok(()) | Err(keyring::Error::NoEntry) => Ok(()),
+            Err(e) => Err(e.to_string()),
+        }
+    }
+}
+
+/// One GET to GitHub: a 200 answer, or why not (rate limits included).
+fn http_call(url: &str, timeout: std::time::Duration) -> Result<ureq::http::Response<ureq::Body>, solidcraft_ui_egui::update::FetchError> {
+    use solidcraft_ui_egui::update::FetchError;
+    use std::time::Duration;
+    let tls = ureq::tls::TlsConfig::builder()
+        .root_certs(ureq::tls::RootCerts::PlatformVerifier)
+        .unversioned_rustls_crypto_provider(std::sync::Arc::new(rustls::crypto::ring::default_provider()))
+        .build();
+    let agent: ureq::Agent = ureq::Agent::config_builder()
+        .tls_config(tls)
+        .https_only(true)
+        .http_status_as_error(false)
+        .timeout_global(Some(timeout))
+        .timeout_connect(Some(Duration::from_secs(5)))
+        .user_agent("SolidCraft-update-check")
+        .max_redirects(3)
+        .build()
+        .into();
+    let response = agent
+        .get(url)
+        .header("Accept", "application/vnd.github+json")
+        .header("X-GitHub-Api-Version", "2022-11-28")
+        .call()
+        .map_err(|e| FetchError::Failed(e.to_string()))?;
+    let status = response.status().as_u16();
+    let header = |k: &str| response.headers().get(k).and_then(|v| v.to_str().ok()).and_then(|v| v.trim().parse::<u64>().ok());
+    if status == 429 || (status == 403 && (header("x-ratelimit-remaining") == Some(0) || header("retry-after").is_some())) {
+        let now = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map_or(0, |d| d.as_secs());
+        let retry_after_s = header("retry-after").or_else(|| header("x-ratelimit-reset").map(|reset| reset.saturating_sub(now))).unwrap_or(3600);
+        return Err(FetchError::RateLimited { retry_after_s });
+    }
+    if status != 200 {
+        return Err(FetchError::Failed(format!("GitHub answered HTTP {status}")));
+    }
+    Ok(response)
+}
+
 /// The per-user settings folder: eframe's storage (`app.ron`) and the anti-aliasing preference.
 fn settings_dir() -> Option<std::path::PathBuf> {
     eframe::storage_dir("SolidCraft")
@@ -141,17 +386,28 @@ fn graphics_path() -> Option<std::path::PathBuf> {
 /// Compatibility shim (docs/compatibility.md): on the first launch after the rename, copy the
 /// settings of earlier releases into the new folder. They kept `graphics.json` (and, on Linux
 /// and macOS, the recovery folder) under the old product name, and eframe's `app.ron` under the
-/// window's app id. The old folders are never changed.
+/// window's old app id. In the Flatpak sandbox, releases before 0.8 kept everything under the
+/// old app id's `~/.var/app` folder; that copy comes first, as it is the newest. The old folders
+/// are never changed.
 fn adopt_legacy_settings() {
     let (Some(current), Some(legacy)) = (settings_dir(), eframe::storage_dir("SolveCraft")) else { return };
-    let legacy_eframe = eframe::storage_dir(APP_ID);
-    if let Err(e) = adopt_settings(&current, &legacy, legacy_eframe.as_deref()) {
+    let legacy_eframe = eframe::storage_dir(solidcraft_engine::io::LEGACY_APP_ID);
+    let old_flatpak = solidcraft_engine::io::legacy_flatpak_path(&current);
+    if let Err(e) = adopt_settings(&current, old_flatpak.as_deref(), &legacy, legacy_eframe.as_deref()) {
         log::warn!("settings: could not copy the previous release's settings into {}: {e}", current.display());
     }
 }
 
-fn adopt_settings(current: &std::path::Path, legacy: &std::path::Path, legacy_eframe: Option<&std::path::Path>) -> std::io::Result<()> {
+fn adopt_settings(
+    current: &std::path::Path,
+    old_flatpak: Option<&std::path::Path>,
+    legacy: &std::path::Path,
+    legacy_eframe: Option<&std::path::Path>,
+) -> std::io::Result<()> {
     let fresh = !current.exists();
+    if let Some(old) = old_flatpak {
+        solidcraft_engine::io::adopt_legacy_dir(current, old)?;
+    }
     solidcraft_engine::io::adopt_legacy_dir(current, legacy)?;
     if let Some(old) = legacy_eframe.map(|d| d.join("app.ron")).filter(|p| fresh && p.is_file()) {
         std::fs::create_dir_all(current)?;
@@ -163,11 +419,19 @@ fn adopt_settings(current: &std::path::Path, legacy: &std::path::Path, legacy_ef
     Ok(())
 }
 
+/// `graphics.json`, read before the window opens.
+fn graphics() -> Option<serde_json::Value> {
+    graphics_path().and_then(|p| std::fs::read_to_string(p).ok()).and_then(|s| serde_json::from_str::<serde_json::Value>(&s).ok())
+}
+
+/// The graphics backend preference (`graphics.json`'s `backend`: `auto`, `dx12`, `vulkan`, `gl`).
+fn backend_preference() -> Option<String> {
+    graphics().and_then(|v| v.get("backend").and_then(serde_json::Value::as_str).map(str::to_string))
+}
+
 /// Anti-aliasing samples from Preferences (4 when unset).
 fn msaa() -> u16 {
-    graphics_path()
-        .and_then(|p| std::fs::read_to_string(p).ok())
-        .and_then(|s| serde_json::from_str::<serde_json::Value>(&s).ok())
+    graphics()
         .and_then(|v| v.get("msaa").and_then(serde_json::Value::as_u64))
         .and_then(|m| u16::try_from(m).ok())
         .filter(|m| [1, 2, 4, 8].contains(m))
@@ -179,6 +443,10 @@ fn msaa() -> u16 {
 const CUSTOM_TITLEBAR: bool = !cfg!(target_os = "macos");
 
 const DEPTH_BITS: u8 = 24;
+/// A 32-bit float depth buffer, drawn with reversed depth (1 near, 0 far) so its precision follows
+/// the distance from the eye (#1434). Only where every adapter offers it with a stencil
+/// ([`startup::float_depth_everywhere`]); else [`DEPTH_BITS`]. Not in safe mode.
+const FLOAT_DEPTH_BITS: u8 = 32;
 /// The section cap marks where it shows in the stencil.
 const STENCIL_BITS: u8 = 8;
 const MSAA: u16 = 4;
@@ -203,13 +471,12 @@ fn app_viewport() -> Result<egui::ViewportBuilder, eframe::Error> {
         .with_app_id(APP_ID))
 }
 
-/// The window's app id: it names the desktop entry, so it stays the packages' reverse-DNS id,
-/// which is kept from before the rename (compatibility shim, docs/compatibility.md).
-const APP_ID: &str = "ai.storyteller.solvecraft";
+/// The window's app id: it names the desktop entry, so it is the packages' reverse-DNS id.
+const APP_ID: &str = solidcraft_engine::io::APP_ID;
 
 fn main() -> eframe::Result {
     adopt_legacy_settings();
-    let samples = msaa();
+    let mut safe_mode = startup::env_on(std::env::var(startup::SAFE_MODE_ENV).ok().as_deref());
     let mut control_port: Option<u16> = solidcraft_engine::geom::env::var("CONTROL_PORT").and_then(|p| p.parse().ok());
     let mut files = Vec::new();
     let mut sample = false;
@@ -218,6 +485,7 @@ fn main() -> eframe::Result {
         match a.as_str() {
             "--control" => control_port = args.next().and_then(|p| p.parse().ok()),
             "--sample" => sample = true,
+            "--safe-mode" => safe_mode = true,
             "--version" | "-V" => {
                 println!("solidcraft {}", env!("CARGO_PKG_VERSION"));
                 return Ok(());
@@ -236,12 +504,32 @@ fn main() -> eframe::Result {
                 return Ok(());
             }
             "--help" | "-h" => {
-                println!("usage: solidcraft [--control PORT] [--sample] [--crash-log] [design.solidcraft | part.step]");
+                println!("usage: solidcraft [--control PORT] [--sample] [--crash-log] [--safe-mode] [design.solidcraft | part.step]");
                 return Ok(());
             }
             _ => files.push(a),
         }
     }
+    // Settings that don't read are moved aside; launches that never got a window are counted,
+    // and after a few in a row this one starts in safe mode (docs/book/src/guide/troubleshooting.md).
+    let settings = settings_dir();
+    let mut notes: Vec<String> = Vec::new();
+    let mut failed_starts = 0;
+    if let Some(dir) = &settings {
+        notes.extend(startup::check_settings(dir, &[solidcraft_ui_egui::prefs::STORAGE_KEY, solidcraft_ui_egui::prefs::LEGACY_STORAGE_KEY]));
+        failed_starts = startup::begin(dir);
+    }
+    if failed_starts >= startup::FAILED_STARTS_FOR_SAFE_MODE && !safe_mode {
+        safe_mode = true;
+        notes.push(format!("The last {failed_starts} launches stopped before the window opened, so this one is in safe mode."));
+    }
+    let cpu_renderer = safe_mode || startup::cpu_renderer_env(std::env::var(startup::RENDERER_ENV).ok().as_deref());
+    if safe_mode {
+        notes.push("Safe mode: default settings (yours are kept for the next normal start), no recovery offer, software rendering.".into());
+    }
+    let samples = if safe_mode { MSAA } else { msaa() };
+    let wgpu_options = wgpu_options(cpu_renderer, if safe_mode { None } else { backend_preference() }.as_deref());
+    let depth_bits = if !safe_mode && startup::float_depth_everywhere(&wgpu_options) { FLOAT_DEPTH_BITS } else { DEPTH_BITS };
     // Crashes leave a report in the crash folder (solidcraft_engine::crash, docs/crash-reports.md).
     let crashed = solidcraft_engine::crash::default_dir()
         .map(|dir| {
@@ -253,13 +541,28 @@ fn main() -> eframe::Result {
             solidcraft_engine::crash::install(dir, build)
         })
         .unwrap_or_default();
+    // A crash in native code (a graphics driver) says where it happened: the exception and the
+    // module on Windows, and on every system the startup step the app was in.
+    #[cfg(target_os = "windows")]
+    native_crash::install();
+    eframe::egui_wgpu::set_startup_hook(startup_step);
+    solidcraft_engine::crash::phase("window");
     let options = eframe::NativeOptions {
         viewport: app_viewport()?,
-        depth_buffer: DEPTH_BITS,
+        depth_buffer: depth_bits,
         stencil_buffer: STENCIL_BITS,
         multisampling: samples,
-        // Kept with the other settings, not in a folder named after the app id.
-        persistence_path: settings_dir().map(|d| d.join("app.ron")),
+        // Kept with the other settings, not in a folder named after the app id. Safe mode reads
+        // and writes a scratch copy, leaving the user's settings as they were.
+        persistence_path: if safe_mode {
+            let scratch = std::env::temp_dir().join(format!("solidcraft-safe-mode-{}.ron", std::process::id()));
+            let _ = std::fs::remove_file(&scratch);
+            Some(scratch)
+        } else {
+            settings.as_ref().map(|d| d.join("app.ron"))
+        },
+        persist_window: !safe_mode,
+        wgpu_options,
         ..Default::default()
     };
     #[cfg(all(unix, not(target_os = "macos")))]
@@ -276,20 +579,45 @@ fn main() -> eframe::Result {
             b.with_x11();
         }));
     }
-    eframe::run_native(
+    // Files opened from Finder and the Dock arrive as events, not arguments.
+    #[cfg(target_os = "macos")]
+    open_documents::install();
+    let created = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
+    let created_in_app = created.clone();
+    let starting = settings.clone();
+    let result = eframe::run_native(
         "SolidCraft",
         options,
         Box::new(move |cc| {
+            created_in_app.store(true, std::sync::atomic::Ordering::SeqCst);
+            solidcraft_engine::crash::phase("app setup");
             solidcraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
-            let mut app = SolveApp::new(Session::default(), services());
+            let mut app = SolveApp::new(Session::default(), services(cc));
+            app.apply_off_thread = Some(solidcraft_ui_egui::dialogs::APPLY_AT_ONCE);
             app.custom_titlebar = CUSTOM_TITLEBAR;
+            // Windows: the OS hit test offers the resize border, at the window's DPI, from the
+            // first message (#1381).
+            #[cfg(target_os = "windows")]
+            {
+                app.native_resize_border = CUSTOM_TITLEBAR && native_frame::install(cc);
+                if CUSTOM_TITLEBAR && !app.native_resize_border {
+                    eprintln!("SolidCraft window: no native resize border; egui edge zones instead");
+                }
+            }
             app.integrated_titlebar = cfg!(target_os = "macos");
-            if let Some(p) = cc.storage.and_then(|s| solidcraft_ui_egui::prefs::stored(|k| s.get_string(k))) {
+            app.cpu_meshing = safe_mode;
+            if let Some(p) = cc.storage.and_then(|s| solidcraft_ui_egui::prefs::stored(|k| s.get_string(k))).filter(|_| !safe_mode) {
                 app.load_prefs(&p);
             }
             if let Some(rs) = &cc.wgpu_render_state {
                 eprintln!("SolidCraft graphics: {:?}, MSAA {}x (requested {}x)", rs.adapter.get_info().backend, rs.msaa_samples, samples);
-                app.set_wgpu(rs, DEPTH_BITS, STENCIL_BITS, rs.msaa_samples);
+                solidcraft_engine::crash::phase("viewport pipelines (shader compile)");
+                app.set_wgpu(rs, depth_bits, STENCIL_BITS, rs.msaa_samples);
+                solidcraft_ui_egui::gpu::install_picture_renderer(rs);
+                // The graphics driver is loaded now; it may have put its own exception filter
+                // in front of ours.
+                #[cfg(target_os = "windows")]
+                native_crash::reinstall();
                 // A saved anti-aliasing the device can't do: back to the default, with a notice.
                 solidcraft_ui_egui::prefs::check_msaa(&mut app, u32::from(samples));
                 let info = rs.adapter.get_info();
@@ -302,6 +630,10 @@ fn main() -> eframe::Result {
                 let rx = control_server::start(port, cc.egui_ctx.clone());
                 app = app.with_control(rx);
             }
+            // The agent chat's MCP bridge reaches the app through an endpoint of its own, started
+            // on a free port the first time the chat connects (docs/agent-chat.md).
+            let ctx = cc.egui_ctx.clone();
+            app.agent_chat.control_starter = Some(Box::new(move |tx| control_server::listen_agent(tx, ctx.clone())));
             if sample {
                 if let Err(e) = app.session.run_script(&solidcraft_engine::sample::script()) {
                     app.set_status(format!("sample: {e}"), true);
@@ -310,9 +642,20 @@ fn main() -> eframe::Result {
                 app.session.mark_saved();
                 app.session.undo.clear();
             }
+            // A launch from Finder: its files arrived before the window.
+            #[cfg(target_os = "macos")]
+            let files = {
+                open_documents::set_ui(&cc.egui_ctx);
+                [files, open_documents::take()].concat()
+            };
             for f in &files {
                 app.open_path_async(f);
             }
+            // No file and no sample: the empty design takes Units of new designs (#1205).
+            // An opened file and the sample part keep the units they were saved or built with.
+            if files.is_empty() && !sample {
+                solidcraft_ui_egui::prefs::apply_new_design(&mut app);
+            }
             // No design given: the start page (not when driven over the control channel, whose
             // clients expect the design view; `ui.home` shows it there).
             if files.is_empty() && !sample && control_port.is_none() {
@@ -323,18 +666,90 @@ fn main() -> eframe::Result {
             if let Some(dir) = solidcraft_engine::recovery::default_dir() {
                 let every = if app.autosave_minutes > 0.0 { app.autosave_minutes * 60.0 } else { f64::MAX / 4.0 };
                 solidcraft_ui_egui::recovery_ui::start(&mut app, &dir, std::time::Duration::from_secs_f64(every.min(1e9)));
+                // Safe mode keeps autosaving but offers nothing: the entries wait for a normal start.
+                if safe_mode {
+                    app.recoverable.clear();
+                }
             }
             // Tell the user about crashes since the last start (after the recovery offer is set up).
             solidcraft_ui_egui::crash_ui::announce(&mut app, &crashed);
-            #[cfg(any(target_os = "windows", target_os = "linux"))]
+            if !notes.is_empty() {
+                app.set_status(notes.join(" "), true);
+            }
+            #[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
             let space_mouse = space_mouse::SpaceMouse::start(&cc.egui_ctx);
+            solidcraft_engine::crash::phase("first frame");
             Ok(Box::new(App {
                 solve: app,
-                #[cfg(any(target_os = "windows", target_os = "linux"))]
+                starting,
+                frames: 0,
+                #[cfg(any(target_os = "windows", target_os = "linux", target_os = "macos"))]
                 space_mouse,
             }))
         }),
-    )
+    );
+    control_server::remove_token_file();
+    match result {
+        Err(e) if !created.load(std::sync::atomic::Ordering::SeqCst) => no_window(e, cpu_renderer, settings.as_deref()),
+        r => r,
+    }
+}
+
+/// egui-wgpu is about to start a step of getting the graphics device and the window's surface up:
+/// the crash journal keeps it, and the adapter once it is picked.
+fn startup_step(step: &'static str, detail: &str) {
+    if step == eframe::egui_wgpu::STEP_ADAPTER_CHOSEN {
+        solidcraft_engine::crash::set_environment(&format!("Renderer: {detail}"));
+    }
+    solidcraft_engine::crash::phase(step);
+}
+
+/// The renderer settings: with `cpu`, the software adapter (WARP, lavapipe, llvmpipe). The
+/// backends come from `startup::choose_backends` (on Windows D3D12 first, and only the backend
+/// in use is started); `preference` is `graphics.json`'s `backend`.
+fn wgpu_options(cpu: bool, preference: Option<&str>) -> eframe::egui_wgpu::WgpuConfiguration {
+    let mut options = eframe::egui_wgpu::WgpuConfiguration::default();
+    if let eframe::egui_wgpu::WgpuSetup::CreateNew(setup) = &mut options.wgpu_setup {
+        let env_set = std::env::var(startup::WGPU_BACKEND_ENV).is_ok_and(|v| !v.trim().is_empty());
+        if let Some(backends) = startup::choose_backends(cfg!(target_os = "windows"), env_set, cpu, preference, startup::has_hardware_adapter) {
+            eprintln!("SolidCraft graphics: starting {backends:?}");
+            setup.instance_descriptor.backends = backends;
+        }
+        if cpu {
+            setup.native_adapter_selector = Some(std::sync::Arc::new(startup::pick_cpu_adapter));
+        }
+        // A float depth buffer with a stencil, wherever the adapter has it (see `FLOAT_DEPTH_BITS`).
+        let base = setup.device_descriptor.clone();
+        setup.device_descriptor = std::sync::Arc::new(move |adapter| {
+            let mut d = base(adapter);
+            d.required_features |= adapter.features() & startup::FLOAT_DEPTH_STENCIL;
+            d
+        });
+    }
+    options
+}
+
+/// The window never opened (no graphics adapter, a device that wouldn't start): once more on
+/// the software renderer, else a message box saying what failed instead of a silent exit.
+fn no_window(error: eframe::Error, tried_cpu: bool, settings: Option<&std::path::Path>) -> eframe::Result {
+    log::error!("the window could not open: {error}");
+    eprintln!("SolidCraft: the window could not open: {error}");
+    if !tried_cpu && let Ok(exe) = std::env::current_exe() {
+        eprintln!("SolidCraft: trying again with the software renderer ({}=cpu)", startup::RENDERER_ENV);
+        match std::process::Command::new(exe).args(std::env::args_os().skip(1)).env(startup::RENDERER_ENV, "cpu").status() {
+            Ok(status) if status.success() => return Ok(()),
+            // The second try showed its own message.
+            Ok(_) => return Err(error),
+            Err(e) => log::error!("could not start again with the software renderer: {e}"),
+        }
+    }
+    let _ = rfd::MessageDialog::new()
+        .set_level(rfd::MessageLevel::Error)
+        .set_title("SolidCraft could not start")
+        .set_description(startup::no_window_message(&error.to_string(), settings))
+        .set_buttons(rfd::MessageButtons::Ok)
+        .show();
+    Err(error)
 }
 
 /// Whether to run through XWayland rather than native Wayland. winit has no file drag-and-drop
@@ -408,14 +823,14 @@ mod msaa_tests {
         std::fs::create_dir_all(&legacy_eframe).unwrap();
         std::fs::write(legacy.join("graphics.json"), r#"{"msaa":8}"#).unwrap();
         std::fs::write(legacy_eframe.join("app.ron"), "(prefs)").unwrap();
-        super::adopt_settings(&current, &legacy, Some(&legacy_eframe)).unwrap();
+        super::adopt_settings(&current, None, &legacy, Some(&legacy_eframe)).unwrap();
         assert_eq!(std::fs::read_to_string(current.join("graphics.json")).unwrap(), r#"{"msaa":8}"#);
         assert_eq!(std::fs::read_to_string(current.join("app.ron")).unwrap(), "(prefs)");
         assert!(legacy.join("graphics.json").is_file() && legacy_eframe.join("app.ron").is_file());
         // Later launches leave the current settings alone.
         std::fs::write(current.join("app.ron"), "(mine)").unwrap();
         std::fs::remove_file(current.join("graphics.json")).unwrap();
-        super::adopt_settings(&current, &legacy, Some(&legacy_eframe)).unwrap();
+        super::adopt_settings(&current, None, &legacy, Some(&legacy_eframe)).unwrap();
         assert_eq!(std::fs::read_to_string(current.join("app.ron")).unwrap(), "(mine)");
         assert!(!current.join("graphics.json").exists());
         let _ = std::fs::remove_dir_all(&d);

apps/solidcraft/src/native_crash.rs

@@ -0,0 +1,285 @@
+//! Windows: what a crash in native code leaves behind (docs/crash-reports.md).
+//!
+//! A crash inside a graphics driver or another DLL (an access violation, a stack overflow) is no
+//! Rust panic: the panic hook never runs and the next start only found "an unclean exit". An
+//! unhandled-exception filter now writes, before the process goes, a small JSON file with the
+//! exception code, the faulting module and the offset into it, and a minidump, next to the run's
+//! crash journal (`solidcraft_engine::crash::native_paths`). The next start puts both into the
+//! unclean exit's report, with the startup step the journal says the app was in.
+//!
+//! Installing an exception filter and asking the system which module holds an address have no
+//! safe API, hence the `unsafe_code` allowance on this module (the app crate denies it; see
+//! `open_documents.rs` for the other one). The filter runs on a thread that may have a broken
+//! heap or almost no stack left: it doesn't allocate, formats into a buffer on the stack, and
+//! skips the minidump after a stack overflow.
+#![allow(unsafe_code)]
+
+use std::fmt::Write as _;
+use std::os::windows::ffi::OsStrExt;
+use std::path::Path;
+use std::sync::OnceLock;
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+use windows_sys::Win32::Foundation::{CloseHandle, GENERIC_WRITE, HANDLE, HMODULE, INVALID_HANDLE_VALUE};
+use windows_sys::Win32::Storage::FileSystem::{CREATE_ALWAYS, CreateFileW, FILE_ATTRIBUTE_NORMAL, WriteFile};
+use windows_sys::Win32::System::Diagnostics::Debug::{
+    EXCEPTION_CONTINUE_SEARCH, EXCEPTION_POINTERS, MINIDUMP_EXCEPTION_INFORMATION, MiniDumpNormal, MiniDumpWithThreadInfo,
+    MiniDumpWithUnloadedModules, MiniDumpWriteDump, SetUnhandledExceptionFilter,
+};
+use windows_sys::Win32::System::LibraryLoader::{
+    GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, GetModuleFileNameW, GetModuleHandleExW,
+};
+use windows_sys::Win32::System::Threading::{GetCurrentProcess, GetCurrentProcessId, GetCurrentThreadId};
+
+/// Where the filter writes (NUL-terminated UTF-16), set once by [`install`].
+struct Paths {
+    info: Vec<u16>,
+    dump: Vec<u16>,
+}
+
+static PATHS: OnceLock<Paths> = OnceLock::new();
+/// The filter that was installed before ours (called after ours), as an address.
+static PREVIOUS: AtomicUsize = AtomicUsize::new(0);
+/// The filter has started writing (a second exception while it does is left alone).
+static BUSY: AtomicBool = AtomicBool::new(false);
+
+const STATUS_ACCESS_VIOLATION: u32 = 0xC000_0005;
+const STATUS_IN_PAGE_ERROR: u32 = 0xC000_0006;
+const STATUS_STACK_OVERFLOW: u32 = 0xC000_00FD;
+
+/// Catch native crashes from now on (after `solidcraft_engine::crash::install`; nothing without it).
+pub fn install() {
+    let Some((info, dump)) = solidcraft_engine::crash::native_paths() else { return };
+    let wide = |p: &Path| p.as_os_str().encode_wide().chain([0]).collect::<Vec<u16>>();
+    if PATHS.set(Paths { info: wide(&info), dump: wide(&dump) }).is_ok() {
+        set_filter();
+    }
+}
+
+/// Put the filter back on top: a DLL loaded since (a graphics driver) may have set its own,
+/// which is then called after ours.
+pub fn reinstall() {
+    if PATHS.get().is_some() {
+        set_filter();
+    }
+}
+
+fn set_filter() {
+    // SAFETY: `filter` has the signature the system calls it with and stays valid for the
+    // process's life.
+    let previous = unsafe { SetUnhandledExceptionFilter(Some(filter)) };
+    if let Some(p) = previous
+        && p as usize != filter as *const () as usize
+    {
+        PREVIOUS.store(p as usize, Ordering::SeqCst);
+    }
+}
+
+/// The unhandled-exception filter: record, then let the previous filter (or the system) go on.
+unsafe extern "system" fn filter(pointers: *const EXCEPTION_POINTERS) -> i32 {
+    if !BUSY.swap(true, Ordering::SeqCst) {
+        // SAFETY: the system passes valid exception pointers for the duration of the call.
+        unsafe { record(pointers) };
+    }
+    let previous = PREVIOUS.load(Ordering::SeqCst);
+    if previous != 0 && previous != filter as *const () as usize {
+        // SAFETY: the address came from `SetUnhandledExceptionFilter` as a filter of this type.
+        let previous: unsafe extern "system" fn(*const EXCEPTION_POINTERS) -> i32 = unsafe { std::mem::transmute(previous) };
+        // SAFETY: as for this filter.
+        return unsafe { previous(pointers) };
+    }
+    EXCEPTION_CONTINUE_SEARCH
+}
+
+/// A fixed buffer to format into without allocating (what doesn't fit is cut off).
+struct Buf {
+    bytes: [u8; 2048],
+    len: usize,
+}
+
+impl std::fmt::Write for Buf {
+    fn write_str(&mut self, s: &str) -> std::fmt::Result {
+        let room = self.bytes.len().saturating_sub(self.len);
+        let n = s.len().min(room);
+        if let (Some(to), Some(from)) = (self.bytes.get_mut(self.len..self.len + n), s.as_bytes().get(..n)) {
+            to.copy_from_slice(from);
+            self.len += n;
+        }
+        Ok(())
+    }
+}
+
+/// The usual names of the exception codes a crash shows.
+fn code_name(code: u32) -> &'static str {
+    match code {
+        STATUS_ACCESS_VIOLATION => "EXCEPTION_ACCESS_VIOLATION",
+        STATUS_IN_PAGE_ERROR => "EXCEPTION_IN_PAGE_ERROR",
+        STATUS_STACK_OVERFLOW => "EXCEPTION_STACK_OVERFLOW",
+        0xC000_001D => "EXCEPTION_ILLEGAL_INSTRUCTION",
+        0xC000_0094 => "EXCEPTION_INT_DIVIDE_BY_ZERO",
+        0xC000_0096 => "EXCEPTION_PRIV_INSTRUCTION",
+        0xC000_008C => "EXCEPTION_ARRAY_BOUNDS_EXCEEDED",
+        0xC000_0374 => "STATUS_HEAP_CORRUPTION",
+        0xC000_0409 => "STATUS_STACK_BUFFER_OVERRUN",
+        0xC000_0602 => "STATUS_FAIL_FAST_EXCEPTION",
+        0x8000_0003 => "EXCEPTION_BREAKPOINT",
+        0xE06D_7363 => "C++ exception",
+        _ => "exception",
+    }
+}
+
+/// Write what `pointers` says into the info file, then the minidump.
+unsafe fn record(pointers: *const EXCEPTION_POINTERS) {
+    let Some(paths) = PATHS.get() else { return };
+    if pointers.is_null() {
+        return;
+    }
+    // SAFETY: checked non-null; the system keeps it valid during the filter.
+    let rec = unsafe { (*pointers).ExceptionRecord };
+    if rec.is_null() {
+        return;
+    }
+    // SAFETY: as above.
+    let rec = unsafe { &*rec };
+    let code = rec.ExceptionCode as u32;
+    let address = rec.ExceptionAddress as usize;
+    let mut module: HMODULE = std::ptr::null_mut();
+    let mut name = [0u16; 512];
+    // SAFETY: FROM_ADDRESS takes the address in place of a name; UNCHANGED_REFCOUNT means no
+    // handle to release; `name` is as long as we say.
+    let len = unsafe {
+        if GetModuleHandleExW(
+            GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
+            address as *const u16,
+            &mut module,
+        ) != 0
+        {
+            GetModuleFileNameW(module, name.as_mut_ptr(), name.len() as u32) as usize
+        } else {
+            0
+        }
+    };
+    // SAFETY: no preconditions.
+    let thread = unsafe { GetCurrentThreadId() };
+    let mut b = Buf { bytes: [0; 2048], len: 0 };
+    let _ = write!(b, "{{\"code\":\"0x{code:08X}\",\"name\":\"{}\",\"address\":\"0x{address:016X}\",\"thread\":{thread}", code_name(code));
+    if len > 0 {
+        let _ = write!(b, ",\"offset\":\"0x{:X}\",\"module\":\"", address.wrapping_sub(module as usize));
+        for c in char::decode_utf16(name.iter().take(len).copied()) {
+            let _ = match c.unwrap_or(char::REPLACEMENT_CHARACTER) {
+                '"' => b.write_str("\\\""),
+                '\\' => b.write_str("\\\\"),
+                c if (c as u32) < 0x20 => b.write_str("?"),
+                c => b.write_char(c),
+            };
+        }
+        let _ = b.write_str("\"");
+    }
+    if matches!(code, STATUS_ACCESS_VIOLATION | STATUS_IN_PAGE_ERROR) && rec.NumberParameters >= 2 {
+        let what = match rec.ExceptionInformation[0] {
+            0 => "read of",
+            1 => "write to",
+            8 => "execution at",
+            _ => "access to",
+        };
+        let _ = write!(b, ",\"detail\":\"{what} 0x{:016X}\"", rec.ExceptionInformation[1]);
+    }
+    let _ = b.write_str("}");
+    let bytes = b.bytes.get(..b.len).unwrap_or_default();
+    // SAFETY: NUL-terminated path; the handle is closed below.
+    unsafe {
+        let file = create(&paths.info);
+        if !file.is_null() {
+            let mut written = 0u32;
+            WriteFile(file, bytes.as_ptr(), bytes.len() as u32, &mut written, std::ptr::null_mut());
+            CloseHandle(file);
+        }
+    }
+    // After a stack overflow there is no stack left for writing a minidump.
+    if code == STATUS_STACK_OVERFLOW {
+        return;
+    }
+    // SAFETY: as above; the exception information points at this thread's exception.
+    unsafe {
+        let file = create(&paths.dump);
+        if !file.is_null() {
+            let exception = MINIDUMP_EXCEPTION_INFORMATION { ThreadId: thread, ExceptionPointers: pointers as *mut _, ClientPointers: 0 };
+            MiniDumpWriteDump(
+                GetCurrentProcess(),
+                GetCurrentProcessId(),
+                file,
+                MiniDumpNormal | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules,
+                &exception,
+                std::ptr::null(),
+                std::ptr::null(),
+            );
+            CloseHandle(file);
+        }
+    }
+}
+
+/// A new file at `path` (NUL-terminated) for writing, or null.
+unsafe fn create(path: &[u16]) -> HANDLE {
+    // SAFETY: the caller passes a NUL-terminated path.
+    let h = unsafe { CreateFileW(path.as_ptr(), GENERIC_WRITE, 0, std::ptr::null(), CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, std::ptr::null_mut()) };
+    if h == INVALID_HANDLE_VALUE { std::ptr::null_mut() } else { h }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::PathBuf;
+
+    /// The child half: install crash reporting and the filter, then fault in native code.
+    #[test]
+    fn child() {
+        let Some(dir) = std::env::var_os("SOLIDCRAFT_NATIVE_CRASH_CHILD") else { return };
+        let build = solidcraft_engine::crash::Build { version: "9.9.9", commit: "abc1234", built: "2026-10-14" };
+        let fresh = solidcraft_engine::crash::install(PathBuf::from(dir), build);
+        println!("FRESH {}", serde_json::to_string(&fresh).unwrap_or_default());
+        if std::env::var_os("SOLIDCRAFT_NATIVE_CRASH_FAULT").is_none() {
+            solidcraft_engine::crash::end_session();
+            return;
+        }
+        super::install();
+        solidcraft_engine::crash::phase("device creation");
+        // SAFETY: none; this is the crash under test (a read of address 16, as a null struct
+        // pointer's field would be).
+        let v = unsafe { std::ptr::read_volatile(16 as *const u64) };
+        println!("unreachable {v}");
+    }
+
+    fn run(dir: &std::path::Path, fault: bool) -> std::process::Output {
+        let mut c = std::process::Command::new(std::env::current_exe().unwrap());
+        c.args(["--exact", "native_crash::tests::child", "--test-threads=1", "--nocapture"]).env("SOLIDCRAFT_NATIVE_CRASH_CHILD", dir);
+        if fault {
+            c.env("SOLIDCRAFT_NATIVE_CRASH_FAULT", "1");
+        }
+        c.output().unwrap()
+    }
+
+    #[test]
+    fn an_access_violation_is_reported_with_its_module_step_and_minidump() {
+        let dir = std::env::temp_dir().join(format!("solidcraft-native-crash-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let out = run(&dir, true);
+        assert_eq!(out.status.code().map(|c| c as u32), Some(super::STATUS_ACCESS_VIOLATION), "{out:?}");
+        let sessions: Vec<PathBuf> = std::fs::read_dir(dir.join("sessions")).unwrap().flatten().map(|e| e.path()).collect();
+        let info = sessions.iter().find(|p| p.to_string_lossy().ends_with(".native.json")).expect("the filter wrote what it caught");
+        let v: serde_json::Value = serde_json::from_slice(&std::fs::read(info).unwrap()).unwrap();
+        assert_eq!(v["code"], "0xC0000005", "{v}");
+        assert_eq!(v["detail"], "read of 0x0000000000000010", "{v}");
+        assert!(v["module"].as_str().unwrap().to_lowercase().contains("solidcraft"), "the fault is in the test binary: {v}");
+        let dump = sessions.iter().find(|p| p.extension().is_some_and(|e| e == "dmp")).expect("a minidump");
+        assert_eq!(std::fs::read(dump).unwrap().get(..4), Some(&b"MDMP"[..]));
+        // The next start reports it.
+        let out = run(&dir, false);
+        assert!(out.status.success(), "{out:?}");
+        let reports = solidcraft_engine::crash::list(&dir);
+        assert_eq!(reports.len(), 1, "{reports:?}");
+        let r = solidcraft_engine::crash::read(&dir, &reports[0].id).unwrap();
+        assert!(r["message"].as_str().unwrap().contains("EXCEPTION_ACCESS_VIOLATION (0xC0000005) in solidcraft"), "{r}");
+        assert!(r["message"].as_str().unwrap().contains("during startup (device creation"), "{r}");
+        assert!(r.get("minidump_path").is_some(), "{r}");
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}

apps/solidcraft/src/native_frame.rs

@@ -0,0 +1,177 @@
+//! Windows: the resize border of the window without OS decorations (#1381).
+//!
+//! The window keeps its native thick frame (`WS_THICKFRAME`, so Aero Snap, Win+arrows and the
+//! OS's own move and size loops work) but winit draws no frame: its `WM_NCCALCSIZE` makes the
+//! whole window client area, and every point then hit-tests as `HTCLIENT`. This module puts the
+//! resize border back by answering `WM_NCHITTEST` itself: within Windows' resize-border width
+//! for the window's current DPI from each edge (`solidcraft_ui_egui::titlebar::resize_hit`;
+//! 8 px at 100 %, corners win), it returns `HTLEFT`, `HTTOPRIGHT`, … So from the first message
+//! the OS shows its resize cursors and runs its own resize, whatever egui has laid out, whatever
+//! the scale; nothing waits for a first frame or a first size change.
+//!
+//! It also answers `WM_GETDPISCALEDSIZE` with the size the window will really have at the new
+//! DPI (the same logical size, as winit computes it), so the rect Windows suggests while the
+//! title bar is dragged onto a monitor with another scale is the rect winit then applies: the
+//! window rescales once at the crossing and stays under the pointer, instead of the OS's move
+//! loop and winit disagreeing about a frame the window doesn't have.
+//!
+//! Replacing a window procedure has no safe API, hence the `unsafe_code` allowance on this
+//! module (the app crate denies it; see `native_crash.rs` and `open_documents.rs` for the others).
+//! The procedure is installed once, on the thread that owns the window, for the main window only,
+//! and calls the previous one (winit's) for everything it doesn't answer.
+#![allow(unsafe_code)]
+
+use std::sync::atomic::{AtomicIsize, Ordering};
+
+use raw_window_handle::{HasWindowHandle, RawWindowHandle};
+use solidcraft_ui_egui::titlebar;
+use windows_sys::Win32::Foundation::{HWND, LPARAM, LRESULT, RECT, SIZE, WPARAM};
+use windows_sys::Win32::UI::HiDpi::{GetDpiForWindow, GetSystemMetricsForDpi};
+use windows_sys::Win32::UI::WindowsAndMessaging::{
+    CallWindowProcW, GWL_STYLE, GWLP_WNDPROC, GetClientRect, GetWindowLongPtrW, GetWindowRect, HTBOTTOM, HTBOTTOMLEFT, HTBOTTOMRIGHT, HTLEFT,
+    HTRIGHT, HTTOP, HTTOPLEFT, HTTOPRIGHT, IsIconic, IsZoomed, SM_CXPADDEDBORDER, SM_CXSIZEFRAME, SetWindowLongPtrW, WM_GETDPISCALEDSIZE,
+    WM_NCDESTROY, WM_NCHITTEST, WNDPROC, WS_THICKFRAME,
+};
+
+/// The window procedure ours replaced (winit's), as an address; 0 before [`install`].
+static PREVIOUS: AtomicIsize = AtomicIsize::new(0);
+
+/// Answer the main window's hit test and DPI-size questions from now on. Call it once, on the
+/// thread that created the window (eframe's app creator). `false` if it isn't a Win32 window.
+pub fn install(window: &impl HasWindowHandle) -> bool {
+    let Ok(handle) = window.window_handle() else { return false };
+    let RawWindowHandle::Win32(w) = handle.as_raw() else { return false };
+    let hwnd = w.hwnd.get() as HWND;
+    if PREVIOUS.load(Ordering::SeqCst) != 0 {
+        return false;
+    }
+    // SAFETY: `hwnd` is the live window eframe just created on this thread; `frame_proc` has the
+    // WNDPROC signature and stays valid for the life of the process. SetWindowLongPtrW returns
+    // the previous procedure, which `frame_proc` calls for every other message.
+    let previous = unsafe { SetWindowLongPtrW(hwnd, GWLP_WNDPROC, frame_proc as *const () as isize as _) };
+    // `as _`: on 32-bit Windows SetWindowLongPtrW is SetWindowLongW, which takes and
+    // returns i32.
+    if previous == 0 {
+        return false;
+    }
+    PREVIOUS.store(previous as _, Ordering::SeqCst);
+    true
+}
+
+/// The procedure ours replaced.
+fn previous() -> WNDPROC {
+    let p = PREVIOUS.load(Ordering::SeqCst);
+    // SAFETY: a nonzero value is the WNDPROC that SetWindowLongPtrW returned in `install`.
+    (p != 0).then(|| unsafe { std::mem::transmute::<isize, unsafe extern "system" fn(HWND, u32, WPARAM, LPARAM) -> LRESULT>(p) })
+}
+
+unsafe extern "system" fn frame_proc(hwnd: HWND, msg: u32, wparam: WPARAM, lparam: LPARAM) -> LRESULT {
+    let prev = previous();
+    // SAFETY: the arguments are the message as Windows delivered it to this window.
+    let call_previous = || unsafe { CallWindowProcW(prev, hwnd, msg, wparam, lparam) };
+    match msg {
+        WM_NCHITTEST => {
+            let default = call_previous();
+            // Screen coordinates, signed (monitors left of or above the primary one).
+            let (x, y) = (i32::from(lparam as u16 as i16), i32::from((lparam >> 16) as u16 as i16));
+            // The border, else what winit and the system say (`HTCLIENT` everywhere else).
+            border_hit(hwnd, x, y).map_or(default, |hit| hit as LRESULT)
+        }
+        WM_GETDPISCALEDSIZE => {
+            let new_dpi = wparam as u32;
+            // SAFETY: for this message lParam points to a SIZE the system reads back.
+            match (resizable(hwnd), client_size(hwnd), unsafe { (lparam as *mut SIZE).as_mut() }) {
+                (true, Some(size), Some(out)) => {
+                    // SAFETY: a window handle the system passed in.
+                    let old_dpi = unsafe { GetDpiForWindow(hwnd) };
+                    match titlebar::dpi_scaled_size(size, old_dpi, new_dpi) {
+                        Some((cx, cy)) => {
+                            *out = SIZE { cx, cy };
+                            1
+                        }
+                        None => call_previous(),
+                    }
+                }
+                _ => call_previous(),
+            }
+        }
+        WM_NCDESTROY => {
+            // Hand the window back to winit's procedure for its last message.
+            if prev.is_some() {
+                // SAFETY: restores the procedure this window had before `install`.
+                unsafe { SetWindowLongPtrW(hwnd, GWLP_WNDPROC, PREVIOUS.load(Ordering::SeqCst) as _) };
+            }
+            call_previous()
+        }
+        _ => call_previous(),
+    }
+}
+
+/// The window can be resized by its border now: it has the thick frame (not fullscreen, which
+/// drops it) and is neither maximized nor minimized.
+fn resizable(hwnd: HWND) -> bool {
+    // SAFETY: plain queries on a window handle the system passed in.
+    unsafe {
+        let style = GetWindowLongPtrW(hwnd, GWL_STYLE) as u32;
+        style & WS_THICKFRAME != 0 && IsZoomed(hwnd) == 0 && IsIconic(hwnd) == 0
+    }
+}
+
+/// The client area's size in pixels (the whole window: winit gives it no frame).
+fn client_size(hwnd: HWND) -> Option<(i32, i32)> {
+    let mut r = RECT { left: 0, top: 0, right: 0, bottom: 0 };
+    // SAFETY: `r` is a valid RECT to fill.
+    (unsafe { GetClientRect(hwnd, &mut r) } != 0).then_some((r.right - r.left, r.bottom - r.top))
+}
+
+/// Windows' resize border at the window's DPI: the sizing frame plus its padding, as Windows
+/// itself sizes it, or 8 px scaled when the system has no answer.
+fn border_px(hwnd: HWND) -> f32 {
+    // SAFETY: plain queries.
+    let (dpi, metric) = unsafe {
+        let dpi = GetDpiForWindow(hwnd);
+        (dpi, GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) + GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi))
+    };
+    let scale = if dpi > 0 { dpi as f32 / 96.0 } else { 1.0 };
+    if metric > 0 { metric as f32 } else { titlebar::resize_border_px(scale) }
+}
+
+/// The `HT*` resize code at screen point (`x`, `y`), if it is on the border.
+fn border_hit(hwnd: HWND, x: i32, y: i32) -> Option<u32> {
+    if !resizable(hwnd) {
+        return None;
+    }
+    let mut r = RECT { left: 0, top: 0, right: 0, bottom: 0 };
+    // SAFETY: `r` is a valid RECT to fill.
+    if unsafe { GetWindowRect(hwnd, &mut r) } == 0 {
+        return None;
+    }
+    let w = egui::Rect::from_min_max(egui::pos2(r.left as f32, r.top as f32), egui::pos2(r.right as f32, r.bottom as f32));
+    titlebar::resize_hit(w, egui::pos2(x as f32, y as f32), border_px(hwnd)).map(hit_code)
+}
+
+fn hit_code(d: egui::ResizeDirection) -> u32 {
+    use egui::ResizeDirection::*;
+    match d {
+        North => HTTOP,
+        South => HTBOTTOM,
+        West => HTLEFT,
+        East => HTRIGHT,
+        NorthWest => HTTOPLEFT,
+        NorthEast => HTTOPRIGHT,
+        SouthWest => HTBOTTOMLEFT,
+        SouthEast => HTBOTTOMRIGHT,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn every_direction_has_its_own_hit_code() {
+        use egui::ResizeDirection::*;
+        let codes: Vec<u32> = [North, South, West, East, NorthWest, NorthEast, SouthWest, SouthEast].into_iter().map(hit_code).collect();
+        assert_eq!(codes, vec![HTTOP, HTBOTTOM, HTLEFT, HTRIGHT, HTTOPLEFT, HTTOPRIGHT, HTBOTTOMLEFT, HTBOTTOMRIGHT]);
+    }
+}

apps/solidcraft/src/open_documents.rs

@@ -0,0 +1,120 @@
+//! macOS: files opened from Finder (double-click, Open With, a drop on the Dock icon) or with
+//! `open -a SolidCraft file` (#997).
+//!
+//! macOS doesn't pass these on the command line: AppKit hands them to the application delegate's
+//! `application:openURLs:`, and when the delegate has no such method it asks `NSDocumentController`,
+//! which fails with "SolidCraft cannot open files in the … format" because SolidCraft isn't an
+//! `NSDocument` app. winit 0.30's delegate doesn't implement the method, so [`install`] adds it to
+//! the delegate's class when the app is about to finish launching: after winit set the delegate and
+//! before AppKit delivers the files the app was launched with. The handler queues the paths and
+//! wakes the UI, which opens them with [`take`] like files named on the command line.
+//!
+//! Adding a method to another crate's Objective-C class has no safe API, hence the `unsafe_code`
+//! allowance on [`install`] and [`add_open_urls_method`] (winit overrides `sendEvent:` on
+//! `NSApplication` similarly).
+
+use std::ptr::NonNull;
+use std::sync::{Mutex, OnceLock, PoisonError};
+
+use block2::RcBlock;
+use objc2::MainThreadMarker;
+use objc2::runtime::{AnyObject, Imp, Sel};
+use objc2::sel;
+use objc2_app_kit::{NSApplication, NSApplicationWillFinishLaunchingNotification};
+use objc2_foundation::{NSArray, NSNotification, NSNotificationCenter, NSURL};
+
+/// Paths that arrived and haven't been opened yet.
+static PENDING: Mutex<Vec<String>> = Mutex::new(Vec::new());
+/// The UI to wake when files arrive (unset until the window exists; the first frame opens them).
+static UI: OnceLock<egui::Context> = OnceLock::new();
+
+/// Handle open-document events from now on. Call before the event loop runs.
+#[allow(unsafe_code)]
+pub fn install() {
+    let block = RcBlock::new(|_: NonNull<NSNotification>| add_open_urls_method());
+    // SAFETY: the name is AppKit's notification constant; no object or queue filter, so the block
+    // runs on the posting thread (AppKit posts it on the main thread). The block captures nothing,
+    // so it is sendable. The notification center keeps the registration (and the block) for the
+    // life of the app.
+    unsafe {
+        NSNotificationCenter::defaultCenter().addObserverForName_object_queue_usingBlock(
+            Some(NSApplicationWillFinishLaunchingNotification),
+            None,
+            None,
+            &block,
+        );
+    }
+}
+
+/// Wake `ctx` when files arrive while the app runs.
+pub fn set_ui(ctx: &egui::Context) {
+    // Set once; a second call would hand over the same context.
+    let _ = UI.set(ctx.clone());
+}
+
+/// The paths that arrived since the last call.
+pub fn take() -> Vec<String> {
+    std::mem::take(&mut *PENDING.lock().unwrap_or_else(PoisonError::into_inner))
+}
+
+/// `application:openURLs:` on the application delegate's class.
+#[allow(unsafe_code)]
+fn add_open_urls_method() {
+    let Some(mtm) = MainThreadMarker::new() else { return };
+    let Some(delegate) = NSApplication::sharedApplication(mtm).delegate() else {
+        log::warn!("no application delegate; files opened from Finder won't open");
+        return;
+    };
+    let class = AsRef::<AnyObject>::as_ref(&*delegate).class();
+    let handler: extern "C-unwind" fn(&AnyObject, Sel, &AnyObject, &NSArray<NSURL>) = open_urls;
+    // SAFETY: `Imp` is the untyped form of a method implementation; the Objective-C runtime calls
+    // it with the arguments the type encoding declares, which match `open_urls`: no return value
+    // (`v`), the receiver (`@`), the selector (`:`), the application (`@`) and the URL array (`@`).
+    let added = unsafe {
+        let imp = std::mem::transmute::<extern "C-unwind" fn(&AnyObject, Sel, &AnyObject, &NSArray<NSURL>), Imp>(handler);
+        objc2::ffi::class_addMethod(std::ptr::from_ref(class).cast_mut(), sel!(application:openURLs:), imp, c"v@:@@".as_ptr())
+    };
+    if !added.as_bool() {
+        log::warn!("the application delegate already handles open-document events");
+    }
+}
+
+/// AppKit calls this; a panic stops here instead of unwinding through AppKit's frames.
+extern "C-unwind" fn open_urls(_delegate: &AnyObject, _cmd: Sel, _app: &AnyObject, urls: &NSArray<NSURL>) {
+    if std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| queue(urls))).is_err() {
+        log::warn!("files opened from Finder were dropped after an internal error");
+    }
+}
+
+/// Queue the files among `urls` and wake the UI.
+fn queue(urls: &NSArray<NSURL>) {
+    // Only file URLs: macOS 27 turns an https URL's path into a file path too.
+    let paths = urls.iter().filter(|u| u.isFileURL()).filter_map(|u| u.to_file_path()).map(|p| p.to_string_lossy().into_owned());
+    PENDING.lock().unwrap_or_else(PoisonError::into_inner).extend(paths);
+    if let Some(ctx) = UI.get() {
+        ctx.request_repaint();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use objc2::runtime::NSObject;
+    use objc2_foundation::NSString;
+
+    use super::*;
+
+    /// Files queue until the UI takes them; URLs that aren't files are left out.
+    #[test]
+    fn opened_files_wait_for_the_ui() {
+        let web = NSURL::URLWithString(&NSString::from_str("https://example.com/a.solidcraft")).unwrap();
+        let urls = NSArray::from_retained_slice(&[
+            NSURL::from_file_path("/tmp/a b.solidcraft").unwrap(),
+            web,
+            NSURL::from_file_path("/tmp/c.step").unwrap(),
+        ]);
+        let any = NSObject::new();
+        open_urls(&any, sel!(application:openURLs:), &any, &urls);
+        assert_eq!(take(), ["/tmp/a b.solidcraft", "/tmp/c.step"]);
+        assert!(take().is_empty());
+    }
+}

apps/solidcraft/src/space_mouse.rs

@@ -1,78 +1,46 @@
-//! 3Dconnexion HID navigation on Windows (through hidapi) and Linux (through hidraw). The device
-//! reader never touches the document or UI; it publishes the latest axes, and the egui thread
-//! applies them once per frame.
+//! 3D mouse navigation on Windows and macOS (through hidapi) and Linux (through spacenavd when it runs, else
+//! hidraw). Read directly, any HID multi-axis controller works: 3Dconnexion's and homemade ones.
+//! The device reader never touches the document or UI; it publishes the latest axes, and the egui
+//! thread applies them once per frame.
 
-mod hid_descriptor;
 #[cfg(target_os = "linux")]
 mod hidraw;
+#[cfg(target_os = "linux")]
+mod spacenavd;
 
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
 use std::time::{Duration, Instant};
 
 use egui::Context;
-use hid_descriptor::Layout;
-#[cfg(target_os = "windows")]
+#[cfg(any(target_os = "windows", target_os = "macos"))]
 use hidapi::{DeviceInfo, HidApi};
 use quick_xml::Reader;
 use quick_xml::events::Event;
-use solidcraft_engine::render::Camera;
+use solidcraft_space_mouse::Layout;
 use solidcraft_ui_egui::SolveApp;
+use solidcraft_ui_egui::space_mouse::{Axes, AxisRule, Calibration, DriverMapping, WheelGuard, calibrated, calibration, navigate_frame};
 
 const STALE_AFTER: Duration = Duration::from_millis(150);
+/// Whether the 3Dconnexion driver (macOS) has the device: it then reports the cap, and reading
+/// the HID device would fail or report it twice.
+static DRIVER_CONNECTED: AtomicBool = AtomicBool::new(false);
+/// Whether this app registered with the 3Dconnexion driver (macOS). The driver then has the device
+/// whether or not it has said so yet, so a failure to open it by HID is no news.
+#[cfg(any(target_os = "windows", target_os = "macos"))]
+static DRIVER_REGISTERED: AtomicBool = AtomicBool::new(false);
+
 const RETRY_AFTER: Duration = Duration::from_secs(2);
 const MAX_PROFILE_BYTES: u64 = 1024 * 1024;
+/// Room for one input report: the 4096 bytes `solidcraft_space_mouse` places fields in, plus the
+/// report id. A smaller buffer would cut a longer report short, and a cut report is dropped whole.
+const REPORT_BUFFER_BYTES: usize = 4096 + 1;
 
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-struct Axes {
-    translation: [i16; 3],
-    rotation: [i16; 3],
-}
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-struct AxisRule {
-    output: usize,
-    enabled: bool,
-    reversed: bool,
-    scale: f64,
-}
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-struct DriverMapping {
-    axes: [AxisRule; 6],
-    overall_scale: f64,
-}
-
-impl Default for DriverMapping {
-    fn default() -> Self {
-        Self { axes: std::array::from_fn(|output| AxisRule { output, enabled: true, reversed: false, scale: 1.0 }), overall_scale: 1.0 }
-    }
-}
-
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-struct Motion {
-    translation: [f64; 3],
-    rotation: [f64; 3],
-}
-
-impl DriverMapping {
-    fn apply(self, axes: Axes) -> Motion {
-        let raw = [
-            normalized(axes.translation[0]),
-            normalized(axes.translation[1]),
-            normalized(axes.translation[2]),
-            normalized(axes.rotation[0]),
-            normalized(axes.rotation[1]),
-            normalized(axes.rotation[2]),
-        ];
-        let mut logical = [0.0; 6];
-        for (input, rule) in self.axes.iter().enumerate() {
-            if rule.enabled {
-                let sign = if rule.reversed { -1.0 } else { 1.0 };
-                logical[rule.output] = raw[input] * sign * rule.scale * self.overall_scale;
-            }
-        }
-        Motion { translation: [logical[0], logical[1], logical[2]], rotation: [logical[3], logical[4], logical[5]] }
-    }
+/// The mapping used when no 3DxWare profile is found: what the driver applies by default in
+/// object mode. On Linux there is no 3DxWare (#1172); on Windows 3DxWare has no profile for
+/// SolidCraft until one is made, and the raw axes swap roll and spin (#1380).
+fn without_profile() -> DriverMapping {
+    DriverMapping::object_mode()
 }
 
 #[derive(Clone, Copy, Debug, Default)]
@@ -197,74 +165,99 @@ fn load_driver_mapping() -> Option<DriverMapping> {
     parse_driver_mapping(&xml)
 }
 
+/// Where the reading comes from, which a calibration is saved under (`Source::key`).
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum Source {
+    /// The device itself, with its vendor and product ids when known.
+    Hid(Option<(u16, u16)>),
+    /// spacenavd, which may have swapped or inverted axes on its own (`spnavcfg`).
+    #[cfg(target_os = "linux")]
+    Spacenavd,
+    /// The 3Dconnexion driver (macOS), which applies its own settings first.
+    #[cfg(target_os = "macos")]
+    Driver,
+}
+
+impl Source {
+    fn key(self) -> String {
+        match self {
+            Self::Hid(Some((vendor, product))) => format!("hid {vendor:04x}:{product:04x}"),
+            Self::Hid(None) => "hid".into(),
+            #[cfg(target_os = "linux")]
+            Self::Spacenavd => "spacenavd".into(),
+            #[cfg(target_os = "macos")]
+            Self::Driver => "3dxware".into(),
+        }
+    }
+}
+
 #[derive(Clone, Copy)]
 struct Reading {
+    /// The device being read; none between devices.
+    device: Option<Source>,
     axes: Axes,
-    translation_at: Instant,
-    rotation_at: Instant,
+    /// When each of X, Y, Z, Rx, Ry and Rz last arrived. Each ages on its own: a device may send
+    /// translation and rotation in separate reports, or spread even one group over several.
+    at: [Instant; 6],
+    /// The source says when the cap is back at rest, so a reading stays until the next one.
+    /// A HID device repeats its report while the cap is held; spacenavd sends a record only when
+    /// the values change, and a steady hold can go seconds without one.
+    held: bool,
 }
 
 impl Reading {
     fn new(now: Instant) -> Self {
-        Self { axes: Axes::default(), translation_at: now, rotation_at: now }
+        Self { device: None, axes: Axes::default(), at: [now; 6], held: false }
     }
 
-    fn current(self, now: Instant) -> Axes {
-        Axes {
-            translation: if now.duration_since(self.translation_at) < STALE_AFTER { self.axes.translation } else { [0; 3] },
-            rotation: if now.duration_since(self.rotation_at) < STALE_AFTER { self.axes.rotation } else { [0; 3] },
+    /// The axes at `now`. One with nothing fresh reads as `rest`: the device's own rest when it
+    /// is calibrated, so a device that rests off zero calibrates to no motion rather than drifting.
+    fn current(self, now: Instant, rest: Axes) -> Axes {
+        let mut axes = self.axes;
+        if !self.held {
+            let rest = rest.translation.into_iter().chain(rest.rotation);
+            for ((value, at), rest) in axes.translation.iter_mut().chain(axes.rotation.iter_mut()).zip(self.at).zip(rest) {
+                if now.duration_since(at) >= STALE_AFTER {
+                    *value = rest;
+                }
+            }
         }
+        axes
     }
 }
 
-/// The old SpaceNavigator uses Logitech's VID; newer 3Dconnexion devices use their own.
-fn is_3d_mouse_vendor(vendor_id: u16) -> bool {
-    matches!(vendor_id, 0x046d | 0x256f)
+/// The raw axes at the device's rest, which calibrate to no motion; 0 without a calibration.
+fn at_rest(calibration: Option<Calibration>) -> Axes {
+    calibration.map(|calibration| calibration.raw_rest().into()).unwrap_or_default()
 }
 
-/// The HID usage excludes ordinary Logitech mice and the keyboard interfaces of SpaceMice.
-#[cfg(target_os = "windows")]
+/// The Generic Desktop "Multi-Axis Controller" usage names a 3D mouse's motion interface, whoever
+/// made it, and excludes ordinary mice and the keyboard interfaces of 3D mice.
+#[cfg(any(target_os = "windows", target_os = "macos"))]
 fn is_3d_mouse(info: &DeviceInfo) -> bool {
-    is_3d_mouse_vendor(info.vendor_id()) && info.usage_page() == 0x01 && info.usage() == 0x08
+    info.usage_page() == 0x01 && info.usage() == 0x08
 }
 
-fn three_axes(bytes: &[u8]) -> Option<[i16; 3]> {
-    let &[x0, x1, y0, y1, z0, z1] = bytes.get(..6)? else { return None };
-    Some([i16::from_le_bytes([x0, x1]), i16::from_le_bytes([y0, y1]), i16::from_le_bytes([z0, z1])])
-}
-
-/// SpaceNavigator reports 1 (translation) and 2 (rotation), each with three signed
-/// little-endian 16-bit values. The HID layer may pad either report to its maximum size.
-/// Some homemade devices send all six values in report 1 instead (`Layout::Combined`): only the
-/// device's report descriptor can tell the two apart, because a padded split report 1 is as long.
+/// Takes the axes an input report carries, as the device's descriptor laid them out, and leaves
+/// the others as they were: translation and rotation may come in separate reports (3Dconnexion's
+/// wired devices) or one (its wireless ones and most homemade devices).
 fn decode_report(report: &[u8], layout: Layout, reading: &mut Reading, now: Instant) -> bool {
-    match report.first().copied() {
-        Some(1) if layout == Layout::Combined => {
-            let Some(body) = report.get(1..) else { return false };
-            let (Some(translation), Some(rotation)) = (body.get(..6).and_then(three_axes), body.get(6..).and_then(three_axes)) else { return false };
-            reading.axes = Axes { translation, rotation };
-            reading.translation_at = now;
-            reading.rotation_at = now;
-            true
+    let Some(decoded) = layout.decode(report) else { return false };
+    let values = reading.axes.translation.iter_mut().chain(reading.axes.rotation.iter_mut());
+    for ((value, at), new) in values.zip(reading.at.iter_mut()).zip(decoded.axes) {
+        if let Some(new) = new {
+            *value = new;
+            *at = now;
         }
-        Some(1) => {
-            let Some(translation) = report.get(1..).and_then(three_axes) else { return false };
-            reading.axes.translation = translation;
-            reading.translation_at = now;
-            true
-        }
-        Some(2) => {
-            let Some(rotation) = report.get(1..).and_then(three_axes) else { return false };
-            reading.axes.rotation = rotation;
-            reading.rotation_at = now;
-            true
-        }
-        _ => false,
     }
+    true
 }
 
 /// Publishes one input report from the device to the egui thread.
 fn publish(ctx: &Context, shared: &Mutex<Reading>, layout: Layout, report: &[u8]) {
+    if DRIVER_CONNECTED.load(Ordering::Relaxed) {
+        return;
+    }
     if let Ok(mut reading) = shared.lock()
         && decode_report(report, layout, &mut reading, Instant::now())
     {
@@ -272,6 +265,26 @@ fn publish(ctx: &Context, shared: &Mutex<Reading>, layout: Layout, report: &[u8]
     }
 }
 
+/// Publishes the cap's position from spacenavd.
+#[cfg(target_os = "linux")]
+fn publish_held(ctx: &Context, shared: &Mutex<Reading>, axes: Axes) {
+    if let Ok(mut reading) = shared.lock() {
+        *reading = Reading { device: reading.device, axes, held: true, ..Reading::new(Instant::now()) };
+        ctx.request_repaint();
+    }
+}
+
+/// A device is open: say which, so its calibration applies.
+fn connected(ctx: &Context, shared: &Mutex<Reading>, source: Source) {
+    if let Ok(mut reading) = shared.lock() {
+        // Nothing has arrived from it yet, so every axis starts out stale.
+        let now = Instant::now();
+        let stale = now.checked_sub(STALE_AFTER).unwrap_or(now);
+        *reading = Reading { device: Some(source), at: [stale; 6], ..Reading::new(now) };
+    }
+    ctx.request_repaint();
+}
+
 /// The device is gone: stop reporting its last position.
 fn reset(ctx: &Context, shared: &Mutex<Reading>) {
     if let Ok(mut reading) = shared.lock() {
@@ -280,7 +293,7 @@ fn reset(ctx: &Context, shared: &Mutex<Reading>) {
     ctx.request_repaint();
 }
 
-#[cfg(target_os = "windows")]
+#[cfg(any(target_os = "windows", target_os = "macos"))]
 fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
     let Ok(mut api) = HidApi::new() else {
         log::warn!("3D mouse: HID initialization failed");
@@ -289,9 +302,22 @@ fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
     loop {
         if let Err(error) = api.refresh_devices() {
             log::warn!("3D mouse: device scan failed: {error}");
-        } else if let Some(device) = api.device_list().find(|info| is_3d_mouse(info)).and_then(|info| info.open_device(&api).ok()) {
-            let layout = device_layout(&device);
-            let mut report = [0_u8; 64];
+        } else if let Some((device, layout, ids)) = api.device_list().filter(|info| is_3d_mouse(info)).find_map(|info| {
+            let device = info
+                .open_device(&api)
+                .inspect_err(|error| {
+                    // On macOS: missing Input Monitoring permission, or the 3DxWare helper holding the device.
+                    // The driver having the device is the reason it cannot be opened, not a problem.
+                    if !DRIVER_CONNECTED.load(Ordering::Relaxed) && !DRIVER_REGISTERED.load(Ordering::Relaxed) {
+                        log::warn!("3D mouse: cannot open the device: {error}");
+                    }
+                })
+                .ok()?;
+            let layout = device_layout(&device, info.vendor_id())?;
+            Some((device, layout, (info.vendor_id(), info.product_id())))
+        }) {
+            connected(&ctx, &shared, Source::Hid(Some(ids)));
+            let mut report = [0_u8; REPORT_BUFFER_BYTES];
             loop {
                 match device.read_timeout(&mut report, 100) {
                     Ok(0) => {}
@@ -308,34 +334,53 @@ fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
     }
 }
 
-/// How the device packs its axes, from its report descriptor; the usual split layout if the
-/// descriptor cannot be read.
-#[cfg(target_os = "windows")]
-fn device_layout(device: &hidapi::HidDevice) -> Layout {
+/// How the device packs its axes, from its report descriptor, or None when it isn't one to read:
+/// a controller whose descriptor names no motion axis. Without a descriptor to go on (it can't be
+/// read, or it's empty), a 3Dconnexion device (Logitech's id for the old SpaceNavigator,
+/// 3Dconnexion's own for the rest) gets 3Dconnexion's layout, and any other device is left alone
+/// rather than guessed at.
+#[cfg(any(target_os = "windows", target_os = "macos"))]
+fn device_layout(device: &hidapi::HidDevice, vendor_id: u16) -> Option<Layout> {
     let mut descriptor = [0_u8; hidapi::MAX_REPORT_DESCRIPTOR_SIZE];
-    match device.get_report_descriptor(&mut descriptor) {
-        Ok(size) => hid_descriptor::Descriptor::parse(descriptor.get(..size).unwrap_or_default()).layout(),
-        Err(error) => {
-            log::info!("3D mouse: no report descriptor, assuming separate translation and rotation reports: {error}");
-            Layout::Split
-        }
+    let read = device.get_report_descriptor(&mut descriptor);
+    if let Ok(size @ 1..) = read {
+        return solidcraft_space_mouse::Descriptor::parse(descriptor.get(..size).unwrap_or_default()).layout();
+    }
+    let why = match read {
+        Err(error) => error.to_string(),
+        Ok(_) => "it is empty".to_string(),
+    };
+    if matches!(vendor_id, 0x046d | 0x256f) {
+        log::info!("3D mouse: no report descriptor ({why}), assuming separate translation and rotation reports");
+        Some(Layout::default())
+    } else {
+        log::debug!("3D mouse: skipping a multi-axis controller without a report descriptor ({why})");
+        None
     }
 }
 
-/// Reads `/dev/hidrawN` with plain blocking reads, which end with an error when the device is
-/// unplugged. Opening needs permission: most distributions grant it to the logged-in user for
-/// devices that carry the `uaccess` udev tag, which a rule for the 3D mouse has to add.
+/// Reads the 3D mouse through spacenavd when it runs, so what `spnavcfg` sets (swapped and inverted
+/// axes, sensitivity, dead zones) applies here as in other programs. Without the daemon it reads
+/// `/dev/hidrawN` with plain blocking reads, which end with an error when the device is unplugged.
+/// Opening needs permission: most distributions grant it to the logged-in user for devices that
+/// carry the `uaccess` udev tag, which a rule for the 3D mouse has to add.
 #[cfg(target_os = "linux")]
 fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
     use std::io::Read;
     let mut denied = None;
     loop {
-        if let Some(device) = hidraw::find() {
+        if let Some(daemon) = spacenavd::connect() {
+            log::info!("3D mouse: reading spacenavd, which applies the spnavcfg settings");
+            connected(&ctx, &shared, Source::Spacenavd);
+            spacenavd::read(daemon, |axes| publish_held(&ctx, &shared, axes));
+            reset(&ctx, &shared);
+        } else if let Some(device) = hidraw::find() {
             match std::fs::File::open(&device.path) {
                 Ok(mut file) => {
                     denied = None;
-                    log::info!("3D mouse: reading {} ({:?} reports)", device.path.display(), device.layout);
-                    let mut report = [0_u8; 64];
+                    log::info!("3D mouse: reading {}", device.path.display());
+                    connected(&ctx, &shared, Source::Hid(device.ids));
+                    let mut report = [0_u8; REPORT_BUFFER_BYTES];
                     loop {
                         match file.read(&mut report) {
                             Ok(0) => break,
@@ -361,11 +406,54 @@ fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
     }
 }
 
+/// macOS: the 3Dconnexion driver gives the device to its own clients only, so SolidCraft registers
+/// as one. Without the driver (or with its helper not running) the HID reader above takes over.
+#[cfg(target_os = "macos")]
+fn start_driver_client(ctx: &Context, shared: &Arc<Mutex<Reading>>) {
+    use solidcraft_3dx_client::Event;
+    let (ctx, shared) = (ctx.clone(), Arc::clone(shared));
+    let started = solidcraft_3dx_client::start(
+        "SolidCraft",
+        move |event| match event {
+            Event::DeviceAdded => {
+                DRIVER_CONNECTED.store(true, Ordering::Relaxed);
+                connected(&ctx, &shared, Source::Driver);
+            }
+            Event::DeviceRemoved => {
+                DRIVER_CONNECTED.store(false, Ordering::Relaxed);
+                reset(&ctx, &shared);
+            }
+            Event::Axes { translation, rotation } => {
+                if let Ok(mut reading) = shared.lock() {
+                    let now = Instant::now();
+                    reading.axes = Axes { translation, rotation };
+                    reading.at = [now; 6];
+                    ctx.request_repaint();
+                }
+            }
+            Event::Buttons(_) => {}
+        },
+        |connected| match connected {
+            Ok(()) => DRIVER_REGISTERED.store(true, Ordering::Relaxed),
+            Err(error) => log::info!("3D mouse: no driver client: {error}"),
+        },
+    );
+    if let Err(error) = started {
+        log::info!("3D mouse: no driver client: {error}");
+    }
+}
+
 pub struct SpaceMouse {
     shared: Arc<Mutex<Reading>>,
     last_frame: Instant,
     driver_mapping: DriverMapping,
     mapping_checked_at: Instant,
+    /// Drops 3DxWare's emulated wheel while the cap moves (#1380).
+    wheel: WheelGuard,
+    started: Instant,
+    /// The calibration as of the last frame and the device it is for, for the wheel filter, which
+    /// runs before the app sees the frame.
+    calibration: Option<(Source, Calibration)>,
 }
 
 impl SpaceMouse {
@@ -377,189 +465,164 @@ impl SpaceMouse {
         if let Err(error) = std::thread::Builder::new().name("solidcraft-3d-mouse".into()).spawn(move || reader(worker_ctx, worker_state)) {
             log::warn!("3D mouse: reader could not start: {error}");
         }
-        Self { shared, last_frame: now, driver_mapping: load_driver_mapping().unwrap_or_default(), mapping_checked_at: now }
+        #[cfg(target_os = "macos")]
+        start_driver_client(ctx, &shared);
+        Self {
+            shared,
+            last_frame: now,
+            driver_mapping: load_driver_mapping().unwrap_or_else(without_profile),
+            mapping_checked_at: now,
+            wheel: WheelGuard::default(),
+            started: now,
+            calibration: None,
+        }
+    }
+
+    /// Before the app's own hook (which adds the control channel's events): with navigation on,
+    /// the wheel events 3DxWare makes from the cap's motion are dropped.
+    pub fn raw_input_hook(&mut self, enabled: bool, raw: &mut egui::RawInput) {
+        self.raw_input_hook_at(enabled, raw, Instant::now());
+    }
+
+    fn raw_input_hook_at(&mut self, enabled: bool, raw: &mut egui::RawInput, now: Instant) {
+        if !enabled {
+            return;
+        }
+        let moving = self
+            .shared
+            .lock()
+            .map(|reading| {
+                // Only the calibration of the device being read: another's would misjudge it.
+                let calibration = self.calibration.filter(|(source, _)| Some(*source) == reading.device).map(|(_, calibration)| calibration);
+                calibrated(reading.current(now, at_rest(calibration)), calibration).moving()
+            })
+            .unwrap_or(false);
+        self.wheel.filter(moving, now.duration_since(self.started).as_secs_f64(), &mut raw.events);
     }
 
     pub fn tick(&mut self, app: &mut SolveApp, ctx: &Context) {
-        let now = Instant::now();
-        let seconds = now.duration_since(self.last_frame).as_secs_f64().min(0.05);
+        self.tick_at(app, ctx, Instant::now());
+    }
+
+    /// The frame at `now`. Tests pass their own clock, so a slow runner can't age a reading.
+    fn tick_at(&mut self, app: &mut SolveApp, ctx: &Context, now: Instant) {
+        let seconds = now.duration_since(self.last_frame).as_secs_f64();
         self.last_frame = now;
         if now.duration_since(self.mapping_checked_at) >= RETRY_AFTER {
-            let updated = load_driver_mapping().unwrap_or_default();
+            let updated = load_driver_mapping().unwrap_or_else(without_profile);
             if updated != self.driver_mapping {
                 log::info!("3D mouse: applying updated 3DxWare axis profile");
                 self.driver_mapping = updated;
             }
             self.mapping_checked_at = now;
         }
-        if !app.preferences.space_mouse_enabled || app.home.open {
-            return;
-        }
-        let axes = match self.shared.lock() {
-            Ok(reading) => reading.current(now),
-            Err(_) => return,
-        };
-        if axes == Axes::default() {
-            return;
-        }
-        let speed = f64::from(app.preferences.space_mouse_speed);
-        if !speed.is_finite() {
-            return;
-        }
-        app.begin_external_navigation();
-        let height = app.viewport.rect.map_or(600.0, |rect| f64::from(rect.height().max(1.0)));
-        navigate(
-            &mut app.cam,
-            self.driver_mapping.apply(axes),
-            seconds * speed.clamp(0.1, 5.0),
-            height,
-            app.session.active_sketch.is_some(),
-            app.preferences.zoom_reverse,
-        );
-        ctx.request_repaint_after(Duration::from_millis(16));
-    }
-}
-
-/// A small dead zone avoids drift at rest. A full cap deflection takes roughly one viewport
-/// per second to pan and about two radians per second to turn, independent of frame rate.
-fn normalized(value: i16) -> f64 {
-    let v = f64::from(value);
-    if v.abs() <= 20.0 { 0.0 } else { v.signum() * ((v.abs() - 20.0) / 330.0).min(1.0) }
-}
-
-fn navigate(cam: &mut Camera, motion: Motion, seconds: f64, height: f64, sketch: bool, reverse_zoom: bool) {
-    if !(seconds > 0.0) || !seconds.is_finite() {
-        return;
-    }
-    let [x, y, z] = motion.translation;
-    let [rx, ry, rz] = motion.rotation;
-    // Logical 3DxWare coordinates are X = left/right, Y = zoom and Z = up/down. The user's
-    // profile above can swap the physical forward/back and up/down axes before they reach here.
-    cam.pan(x * height * 0.6 * seconds, z * height * 0.6 * seconds, height);
-    let zoom_sign = if reverse_zoom { -1.0 } else { 1.0 };
-    cam.zoom_at((-y * zoom_sign * 1.5 * seconds).exp(), None);
-    if !sketch {
-        // These are logical 3DxWare coordinates after the profile mapping above: Rx is Tilt,
-        // Ry is Roll and Rz is Spin. The KMJ profile swaps physical Ry/Rz for the selected
-        // navigation mode, so swapping them again here would make Roll behave like Spin.
-        cam.orbit(ry * 250.0 * seconds, rx * 250.0 * seconds);
-        cam.roll_by(rz * 2.0 * seconds);
+        let Ok(reading) = self.shared.lock().map(|reading| *reading) else { return };
+        app.space_mouse.device = reading.device.map(Source::key);
+        let calibration = calibration(app);
+        self.calibration = reading.device.zip(calibration);
+        // While this device is being calibrated, an axis with nothing fresh reads 0, as a HID
+        // device's silence means: the old calibration's rest isn't fed back into the new one. A
+        // calibration of another device doesn't count; it ends in `navigate_frame`.
+        let calibrating = app.space_mouse.calibrating.as_ref().is_some_and(|(device, _)| app.space_mouse.device.as_ref() == Some(device));
+        let rest = if calibrating { Axes::default() } else { at_rest(calibration) };
+        navigate_frame(app, ctx, self.driver_mapping, reading.current(now, rest), seconds);
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
+    use solidcraft_ui_egui::space_mouse::{DeviceMotion, Motion};
 
-    fn raw(axes: Axes) -> Motion {
-        DriverMapping::default().apply(axes)
+    /// The logical axes a reading reaches. Logical Rz rolls the view and logical Ry turns it about
+    /// its vertical (`navigation::device_camera` in solidcraft-ui-egui, tested there).
+    fn rotation(mapping: DriverMapping, rotation: [i16; 3]) -> [f64; 3] {
+        mapping.apply(Axes { translation: [0; 3], rotation }).rotation
     }
 
     #[test]
-    fn decodes_separate_reports_without_stale_motion_or_padding_interference() {
+    fn each_axis_keeps_its_own_age_so_stale_motion_stops() {
+        // Report layouts are tested in solidcraft-space-mouse; here, what the reader keeps.
         let now = Instant::now();
         let mut reading = Reading::new(now);
-        assert!(!decode_report(&[1, 1, 2], Layout::Split, &mut reading, now));
-        assert_eq!(reading.current(now), Axes::default());
-        assert!(decode_report(&[1, 0x9c, 0xff, 0x2c, 0x01, 0, 0], Layout::Split, &mut reading, now));
-        assert_eq!(reading.current(now).translation, [-100, 300, 0]);
-        assert!(decode_report(&[2, 0, 0, 1, 0, 0xff, 0xff], Layout::Split, &mut reading, now));
-        assert_eq!(reading.current(now).rotation, [0, 1, -1]);
+        let layout = Layout::default();
+        assert!(!decode_report(&[1, 1, 2], layout, &mut reading, now));
+        assert_eq!(reading.current(now, Axes::default()), Axes::default());
+        assert!(decode_report(&[1, 0x9c, 0xff, 0x2c, 0x01, 0, 0], layout, &mut reading, now));
+        assert!(decode_report(&[2, 0, 0, 1, 0, 0xff, 0xff], layout, &mut reading, now));
+        assert_eq!(reading.current(now, Axes::default()), Axes { translation: [-100, 300, 0], rotation: [0, 1, -1] });
+        // Only rotation arrives again: translation goes stale, rotation stays current.
         let later = now + STALE_AFTER + Duration::from_millis(1);
-        assert_eq!(reading.current(later), Axes::default());
-        assert!(decode_report(&[2, 4, 0, 5, 0, 6, 0], Layout::Split, &mut reading, later));
-        assert!(decode_report(&[1, 1, 0, 2, 0, 3, 0, 0, 0, 0, 0, 0, 0], Layout::Split, &mut reading, later));
-        assert_eq!(reading.current(later), Axes { translation: [1, 2, 3], rotation: [4, 5, 6] });
+        assert!(decode_report(&[2, 4, 0, 5, 0, 6, 0], layout, &mut reading, later));
+        assert_eq!(reading.current(later, Axes::default()), Axes { translation: [0; 3], rotation: [4, 5, 6] });
+        // A device sending all six in one report updates both at once.
+        let combined = solidcraft_space_mouse::Descriptor::parse(&[
+            0x05, 0x01, 0x09, 0x08, 0xA1, 0x01, 0x85, 0x01, 0x16, 0xA2, 0xFE, 0x26, 0x5E, 0x01, 0x75, 0x10, 0x95, 0x06, 0x19, 0x30, 0x29, 0x35, 0x81,
+            0x02, 0xC0,
+        ])
+        .layout()
+        .expect("six axes declared");
+        let mut both = Reading::new(now);
+        assert!(decode_report(&[1, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0], combined, &mut both, now));
+        assert_eq!(both.current(now, Axes::default()), Axes { translation: [1, 2, 3], rotation: [4, 5, 6] });
     }
 
     #[test]
-    fn combined_report_one_carries_translation_and_rotation_together() {
+    fn a_group_spread_over_reports_keeps_the_axes_it_already_has() {
+        // X in report 1, Y in report 2 (16-bit, -350..350): X arriving mustn't zero Y, and Y
+        // arriving mustn't zero X.
+        let split_x_y = solidcraft_space_mouse::Descriptor::parse(&[
+            0x05, 0x01, 0x09, 0x08, 0xA1, 0x01, 0x16, 0xA2, 0xFE, 0x26, 0x5E, 0x01, 0x75, 0x10, 0x95, 0x01, // 1 x 16 bit, -350..350
+            0x85, 0x01, 0x09, 0x30, 0x81, 0x02, // report 1: X
+            0x85, 0x02, 0x09, 0x31, 0x81, 0x02, // report 2: Y
+            0xC0,
+        ])
+        .layout()
+        .expect("X and Y declared");
         let now = Instant::now();
         let mut reading = Reading::new(now);
-        // Report id 1, then X Y Z Rx Ry Rz as signed little-endian 16-bit values.
-        let report = [1, 0x9c, 0xff, 0x2c, 0x01, 0, 0, 1, 0, 0, 0, 0xff, 0xff];
-        assert!(decode_report(&report, Layout::Combined, &mut reading, now));
-        assert_eq!(reading.current(now), Axes { translation: [-100, 300, 0], rotation: [1, 0, -1] });
-        // The same bytes on a split device are only the translation report; its padding is not rotation.
-        let mut split = Reading::new(now);
-        assert!(decode_report(&report, Layout::Split, &mut split, now));
-        assert_eq!(split.current(now), Axes { translation: [-100, 300, 0], rotation: [0; 3] });
+        assert!(decode_report(&[1, 100, 0], split_x_y, &mut reading, now));
+        assert!(decode_report(&[2, 200, 0], split_x_y, &mut reading, now));
+        assert_eq!(reading.current(now, Axes::default()).translation, [100, 200, 0]);
+        // Then only X keeps coming: Y goes stale on its own.
+        let later = now + STALE_AFTER + Duration::from_millis(1);
+        assert!(decode_report(&[1, 50, 0], split_x_y, &mut reading, later));
+        assert_eq!(reading.current(later, Axes::default()).translation, [50, 0, 0]);
     }
 
     #[test]
-    fn combined_layout_ignores_short_and_other_reports() {
+    fn only_the_axis_itself_keeps_it_alive() {
+        // 3Dconnexion's split layout, plus buttons in report 3 (one byte of bits).
+        let mut layout = Layout::default();
+        layout.buttons[0] =
+            Some(solidcraft_space_mouse::Field { report_id: 3, bit_offset: 0, bits: 1, logical_min: 0, logical_max: 1, relative: false });
         let now = Instant::now();
         let mut reading = Reading::new(now);
-        assert!(!decode_report(&[1, 1, 0, 2, 0, 3, 0], Layout::Combined, &mut reading, now));
-        assert!(!decode_report(&[3, 1, 0, 0, 0, 0], Layout::Combined, &mut reading, now));
-        assert!(!decode_report(&[], Layout::Combined, &mut reading, now));
-        assert_eq!(reading.current(now), Axes::default());
-        // Extra padding after the six values is fine.
-        assert!(decode_report(&[1, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 0, 0], Layout::Combined, &mut reading, now));
-        assert_eq!(reading.current(now), Axes { translation: [1, 2, 3], rotation: [4, 5, 6] });
+        assert!(decode_report(&[1, 100, 0, 0, 0, 0, 0], layout, &mut reading, now));
+        // Just before the timeout X is still there; at exactly the timeout it's stale.
+        assert_eq!(reading.current(now + STALE_AFTER - Duration::from_millis(1), Axes::default()).translation, [100, 0, 0]);
+        assert_eq!(reading.current(now + STALE_AFTER, Axes::default()).translation, [0; 3]);
+        // Button reports and reports with an id the layout doesn't know keep coming, but neither
+        // refreshes X: it goes stale on time all the same.
+        for step in 1..=10 {
+            let at = now + STALE_AFTER * step / 10;
+            assert!(decode_report(&[3, 1], layout, &mut reading, at));
+            assert!(!decode_report(&[0x17, 80], layout, &mut reading, at));
+        }
+        assert_eq!(reading.current(now + STALE_AFTER, Axes::default()).translation, [0; 3]);
     }
 
     #[test]
-    fn six_axes_move_the_camera_and_sketches_keep_their_orientation() {
-        let mut cam = Camera::default();
-        let before = cam;
-        navigate(&mut cam, raw(Axes { translation: [350, 350, 350], rotation: [350, 350, 350] }), 0.02, 600.0, false, false);
-        assert_ne!(cam.target, before.target);
-        assert!(cam.distance < before.distance);
-        assert_ne!(cam.yaw, before.yaw);
-        assert_ne!(cam.pitch, before.pitch);
-        assert_ne!(cam.roll, before.roll);
-        let orientation = (cam.yaw, cam.pitch, cam.roll);
-        navigate(&mut cam, raw(Axes { translation: [350, 0, 0], rotation: [350, 350, 350] }), 0.02, 600.0, true, false);
-        assert_eq!((cam.yaw, cam.pitch, cam.roll), orientation);
-        assert!(cam.is_valid());
-    }
-
-    #[test]
-    fn individual_axes_have_physical_spacemouse_meaning() {
-        let before = Camera::default();
-
-        let mut slide = before;
-        navigate(&mut slide, raw(Axes { translation: [350, 0, 0], rotation: [0; 3] }), 0.02, 600.0, false, false);
-        assert_ne!(slide.target, before.target);
-        assert_eq!(slide.distance, before.distance);
-
-        let mut push = before;
-        navigate(&mut push, raw(Axes { translation: [0, 350, 0], rotation: [0; 3] }), 0.02, 600.0, false, false);
-        assert_eq!(push.target, before.target);
-        assert!(push.distance < before.distance);
-
-        let mut lift = before;
-        navigate(&mut lift, raw(Axes { translation: [0, 0, 350], rotation: [0; 3] }), 0.02, 600.0, false, false);
-        assert_ne!(lift.target, before.target);
-        assert_eq!(lift.distance, before.distance);
-
-        let mut tilt = before;
-        navigate(&mut tilt, raw(Axes { translation: [0; 3], rotation: [350, 0, 0] }), 0.02, 600.0, false, false);
-        assert_eq!((tilt.yaw, tilt.roll), (before.yaw, before.roll));
-        assert_ne!(tilt.pitch, before.pitch);
-
-        let mut roll = before;
-        navigate(&mut roll, raw(Axes { translation: [0; 3], rotation: [0, 350, 0] }), 0.02, 600.0, false, false);
-        assert_eq!((roll.pitch, roll.roll), (before.pitch, before.roll));
-        assert_ne!(roll.yaw, before.yaw);
-
-        let mut twist = before;
-        navigate(&mut twist, raw(Axes { translation: [0; 3], rotation: [0, 0, 350] }), 0.02, 600.0, false, false);
-        assert_eq!((twist.yaw, twist.pitch), (before.yaw, before.pitch));
-        assert_ne!(twist.roll, before.roll);
-    }
-
-    #[test]
-    fn reverse_zoom_setting_applies_to_spacemouse() {
-        let before = Camera::default();
-        let motion = raw(Axes { translation: [0, 350, 0], rotation: [0; 3] });
-        let mut normal = before;
-        navigate(&mut normal, motion, 0.02, 600.0, false, false);
-        let mut reversed = before;
-        navigate(&mut reversed, motion, 0.02, 600.0, false, true);
-        assert!(normal.distance < before.distance);
-        assert!(reversed.distance > before.distance);
+    fn a_held_reading_stays_until_the_next_one_and_a_hid_reading_goes_stale() {
+        let now = Instant::now();
+        let axes = Axes { translation: [0, 200, 0], rotation: [0; 3] };
+        let later = now + STALE_AFTER * 20;
+        // spacenavd sends nothing while the values stay the same: the push lasts.
+        let held = Reading { axes, held: true, ..Reading::new(now) };
+        assert_eq!(held.current(later, Axes::default()), axes);
+        // A HID device repeats its report: silence means the cap, or the device, is gone.
+        let hid = Reading { axes, ..Reading::new(now) };
+        assert_eq!(hid.current(later, Axes::default()), Axes::default());
     }
 
     #[test]
@@ -581,7 +644,28 @@ mod tests {
     }
 
     #[test]
-    fn mapped_roll_and_spin_reach_distinct_camera_rotations() {
+    fn without_a_profile_the_drivers_object_mode_axes_are_used() {
+        // 3DxWare's object-mode mapping, as a profile (#1172: confirmed on a SpaceMouse Compact).
+        let object_mode = br#"
+            <AppCfg><Devices><Device><AxisBank>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_X</ActionID></Input><Output><ActionID>HIDMultiAxis_X</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Y</ActionID></Input><Output><ActionID>HIDMultiAxis_Y</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Z</ActionID></Input><Output><ActionID>HIDMultiAxis_Z</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Rx</ActionID></Input><Output><ActionID>HIDMultiAxis_Rx</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Ry</ActionID></Input><Output><ActionID>HIDMultiAxis_Rz</ActionID><Reversed>true</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Rz</ActionID></Input><Output><ActionID>HIDMultiAxis_Ry</ActionID><Reversed>true</Reversed></Output></Axis>
+            </AxisBank></Device></Devices></AppCfg>
+        "#;
+        let profile = parse_driver_mapping(object_mode).expect("valid 3DxWare profile");
+        // On every platform (#1172 on Linux, #1380 on Windows).
+        assert_eq!(without_profile(), profile);
+        // Tilting the cap rolls the view and twisting it spins it, as with the driver.
+        assert_eq!(rotation(without_profile(), [0, 350, 0]), [0.0, 0.0, -1.0]);
+        assert_eq!(rotation(without_profile(), [0, 0, 350]), [0.0, -1.0, 0.0]);
+    }
+
+    #[test]
+    fn mapped_roll_and_spin_reach_the_roll_and_turn_axes() {
         let profile = br#"
             <AppCfg><Devices><Device><AxisBank>
               <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Ry</ActionID></Input><Output><ActionID>HIDMultiAxis_Rz</ActionID><Reversed>false</Reversed></Output></Axis>
@@ -589,16 +673,170 @@ mod tests {
             </AxisBank></Device></Devices></AppCfg>
         "#;
         let mapping = parse_driver_mapping(profile).expect("valid 3DxWare profile");
-        let before = Camera::default();
+        // The physical roll reaches the roll axis only, and the physical spin the turn only.
+        assert_eq!(rotation(mapping, [0, 350, 0]), [0.0, 0.0, 1.0]);
+        assert_eq!(rotation(mapping, [0, 0, 350]), [0.0, -1.0, 0.0]);
+    }
 
-        let mut physical_roll = before;
-        navigate(&mut physical_roll, mapping.apply(Axes { translation: [0; 3], rotation: [0, 350, 0] }), 0.02, 600.0, false, false);
-        assert_eq!((physical_roll.yaw, physical_roll.pitch), (before.yaw, before.pitch));
-        assert_ne!(physical_roll.roll, before.roll);
+    #[test]
+    fn each_frame_hands_the_view_its_motion_through_the_drivers_mapping() {
+        // The reader's latest tilt, and a profile that makes tilt roll: the frame's motion rolls.
+        // The frame runs at the reading's own time, so a slow runner can't let the reading go stale.
+        let mut app = SolveApp::new(solidcraft_engine::Session::default(), solidcraft_ui_egui::Services::default());
+        app.home.open = false;
+        let now = Instant::now();
+        let mut reading = Reading::new(now);
+        reading.axes.rotation = [0, 350, 0];
+        let mut mouse = SpaceMouse {
+            shared: Arc::new(Mutex::new(reading)),
+            last_frame: now - Duration::from_millis(20),
+            driver_mapping: DriverMapping::object_mode(),
+            mapping_checked_at: now,
+            wheel: WheelGuard::default(),
+            started: now,
+            calibration: None,
+        };
+        // A window that has run a frame with focus, as the app's always has by now.
+        let ctx = Context::default();
+        let _ = ctx.run_ui(egui::RawInput::default(), |_| {});
+        mouse.tick_at(&mut app, &ctx, now);
+        let DeviceMotion { motion, seconds } = app.viewport.device_motion.expect("the frame hands the page its motion");
+        assert_eq!(motion, Motion { translation: [0.0; 3], rotation: [0.0, 0.0, -1.0] });
+        assert!(seconds > 0.0);
+    }
 
-        let mut physical_spin = before;
-        navigate(&mut physical_spin, mapping.apply(Axes { translation: [0; 3], rotation: [0, 0, 350] }), 0.02, 600.0, false, false);
-        assert_ne!(physical_spin.yaw, before.yaw);
-        assert_eq!((physical_spin.pitch, physical_spin.roll), (before.pitch, before.roll));
+    fn wheel() -> egui::Event {
+        egui::Event::MouseWheel {
+            unit: egui::MouseWheelUnit::Line,
+            delta: egui::vec2(0.0, -1.0),
+            modifiers: Default::default(),
+            phase: egui::TouchPhase::Move,
+        }
+    }
+
+    fn mouse(reading: Reading, now: Instant) -> SpaceMouse {
+        SpaceMouse {
+            shared: Arc::new(Mutex::new(reading)),
+            last_frame: now,
+            driver_mapping: DriverMapping::object_mode(),
+            mapping_checked_at: now,
+            wheel: WheelGuard::default(),
+            started: now,
+            calibration: None,
+        }
+    }
+
+    const DEVICE: Source = Source::Hid(Some((0x1234, 0x5678)));
+
+    /// A device whose raw axes all rest at 100, calibrated as such.
+    fn resting_at_100() -> Calibration {
+        Calibration {
+            dead_zone_share: 0.0,
+            axes: std::array::from_fn(|source| solidcraft_space_mouse::AxisCalibration {
+                source,
+                reversed: false,
+                rest: 100,
+                dead_zone: 0,
+                full: [350; 2],
+            }),
+        }
+    }
+
+    #[test]
+    fn a_calibrated_device_resting_off_zero_leaves_the_wheel_alone() {
+        // Read raw, X at 100 is the cap pushed past the dead zone: the wheel is dropped.
+        let now = Instant::now();
+        let mut resting = Reading::new(now);
+        resting.device = Some(DEVICE);
+        resting.axes = Axes { translation: [100; 3], rotation: [100; 3] };
+        let wheel_kept = |calibration| {
+            let mut mouse = mouse(resting, now);
+            mouse.calibration = calibration;
+            let mut raw = egui::RawInput { events: vec![wheel()], ..Default::default() };
+            mouse.raw_input_hook_at(true, &mut raw, now);
+            raw.events.len() == 1
+        };
+        assert!(!wheel_kept(None));
+        // Calibrated, it's at rest, so the wheel is the user's.
+        assert!(wheel_kept(Some((DEVICE, resting_at_100()))));
+        // Another device's calibration, kept from the last frame, isn't used for this one.
+        assert!(!wheel_kept(Some((Source::Hid(Some((0x256f, 0xc63a))), resting_at_100()))));
+    }
+
+    #[test]
+    fn a_calibrated_device_resting_off_zero_doesnt_drift_when_nothing_fresh_arrives() {
+        let mut app = SolveApp::new(solidcraft_engine::Session::default(), solidcraft_ui_egui::Services::default());
+        app.home.open = false;
+        app.preferences.space_mouse_calibrations.insert(DEVICE.key(), resting_at_100());
+        // A window that has run a frame with focus, as the app's always has by now.
+        let ctx = Context::default();
+        let mut frame = ctx.run_ui(egui::RawInput::default(), |_| {});
+        frame.textures_delta.clear();
+        let motion = |app: &mut SolveApp, reading: Reading, now: Instant| {
+            let mut mouse = mouse(reading, now);
+            mouse.last_frame = now - Duration::from_millis(20);
+            app.viewport.device_motion = None;
+            mouse.tick_at(app, &ctx, now);
+            app.viewport.device_motion.is_some()
+        };
+        // Connected, and nothing reported yet.
+        let shared = Mutex::new(Reading::new(Instant::now()));
+        connected(&Context::default(), &shared, DEVICE);
+        let fresh = *shared.lock().unwrap();
+        let now = Instant::now();
+        assert!(!motion(&mut app, fresh, now), "connected, nothing reported yet");
+        // The same, while another device's calibration window was open: it ends, and this one
+        // doesn't move on the first frame either.
+        app.space_mouse.calibrating = Some(("hid 256f:c63a".into(), solidcraft_space_mouse::Wizard::default()));
+        assert!(!motion(&mut app, fresh, now), "connected mid-calibration of another device");
+        assert!(app.space_mouse.calibrating.is_none());
+        // Translation reported at rest, rotation not for a while.
+        let old = now - STALE_AFTER - Duration::from_millis(1);
+        let partly = Reading { axes: Axes { translation: [100; 3], rotation: [0; 3] }, at: [now, now, now, old, old, old], ..fresh };
+        assert!(!motion(&mut app, partly, now), "translation at rest, rotation stale");
+        // Pushed, then the reports stopped.
+        let pushed = Reading { axes: Axes { translation: [450, 100, 100], rotation: [100; 3] }, at: [old; 6], ..fresh };
+        assert!(!motion(&mut app, pushed, now), "the push timed out");
+        assert!(motion(&mut app, Reading { at: [now; 6], ..pushed }, now), "a fresh push moves the view");
+    }
+
+    #[test]
+    fn the_wheel_3dxware_makes_from_the_cap_is_dropped() {
+        // The cap tilted forward: 3DxWare also sends wheel turns (#1380). They are dropped.
+        let now = Instant::now();
+        let mut tilted = Reading::new(now);
+        tilted.axes.rotation = [-200, 0, 0];
+        let mut moving = mouse(tilted, now);
+        let mut raw = egui::RawInput { events: vec![wheel(), egui::Event::Zoom(1.1), egui::Event::Text("a".into())], ..Default::default() };
+        moving.raw_input_hook_at(true, &mut raw, now);
+        assert_eq!(raw.events, [egui::Event::Text("a".into())]);
+        // With navigation off, the wheel is the cap's only way to move the view: kept.
+        let mut raw = egui::RawInput { events: vec![wheel()], ..Default::default() };
+        moving.raw_input_hook_at(false, &mut raw, now);
+        assert_eq!(raw.events.len(), 1);
+        // The cap at rest: the wheel is the user's.
+        let mut resting = mouse(Reading::new(now), now);
+        let mut raw = egui::RawInput { events: vec![wheel()], ..Default::default() };
+        resting.raw_input_hook_at(true, &mut raw, now);
+        assert_eq!(raw.events.len(), 1);
+    }
+
+    #[test]
+    fn the_wheel_is_the_users_again_once_the_cap_has_been_still_a_moment() {
+        let now = Instant::now();
+        let mut tilted = Reading::new(now);
+        tilted.axes.rotation = [-200, 0, 0];
+        let mut cap = mouse(tilted, now);
+        let mut raw = egui::RawInput { events: vec![wheel()], ..Default::default() };
+        cap.raw_input_hook_at(true, &mut raw, now);
+        assert!(raw.events.is_empty(), "dropped while the cap moves");
+        // Let go, then wait out the quiet time.
+        let later = now + Duration::from_secs_f64(solidcraft_ui_egui::space_mouse::WHEEL_QUIET_S) + Duration::from_millis(60);
+        if let Ok(mut reading) = cap.shared.lock() {
+            *reading = Reading::new(later);
+        }
+        let mut raw = egui::RawInput { events: vec![wheel()], ..Default::default() };
+        cap.raw_input_hook_at(true, &mut raw, later);
+        assert_eq!(raw.events.len(), 1, "kept once the cap has been still");
     }
 }

apps/solidcraft/src/space_mouse/hid_descriptor.rs

@@ -1,253 +0,0 @@
-//! Just enough of a HID report descriptor reader to recognise a 3D mouse and to see how it packs
-//! its motion axes. Written from the public USB HID specification. Malformed input never panics;
-//! it simply yields less information.
-
-/// Generic Desktop usage page, and the usages in it that matter here.
-const PAGE_GENERIC_DESKTOP: u32 = 0x01;
-const USAGE_MULTI_AXIS_CONTROLLER: u32 = 0x08;
-const FIRST_AXIS_USAGE: u32 = 0x30; // X, Y, Z, Rx, Ry, Rz are 0x30..=0x35
-const AXIS_COUNT: u32 = 6;
-
-/// Motion reports are report id 1 (translation, or everything) and report id 2 (rotation).
-const MOTION_REPORT_ID: u8 = 1;
-
-/// Descriptors are small (hidapi reserves 4 KiB). Anything past this is ignored.
-const MAX_DESCRIPTOR_BYTES: usize = 4096;
-/// Bound on the usages one main item can declare through a usage range.
-const MAX_USAGES_PER_ITEM: u32 = 256;
-
-/// How a device spreads its six motion axes over input reports.
-#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
-pub enum Layout {
-    /// Report 1 carries translation and report 2 carries rotation, three 16-bit values each.
-    /// This is how 3Dconnexion devices report, and it is the layout assumed when nothing is known.
-    #[default]
-    Split,
-    /// Report 1 carries all six axes: translation, then rotation. Homemade devices do this.
-    Combined,
-}
-
-#[derive(Clone, Copy)]
-struct Item {
-    /// 0 main, 1 global, 2 local (3 is reserved).
-    kind: u8,
-    tag: u8,
-    value: u32,
-}
-
-/// Walks the short items of a descriptor. Long items are skipped; a truncated tail ends the walk.
-fn items(descriptor: &[u8]) -> impl Iterator<Item = Item> + '_ {
-    let descriptor = descriptor.get(..MAX_DESCRIPTOR_BYTES).unwrap_or(descriptor);
-    let mut pos = 0_usize;
-    std::iter::from_fn(move || {
-        loop {
-            let prefix = *descriptor.get(pos)?;
-            pos += 1;
-            if prefix == 0xFE {
-                // Long item: a data length byte, a tag byte, then the data.
-                let length = usize::from(*descriptor.get(pos)?);
-                pos = pos.checked_add(2 + length)?;
-                continue;
-            }
-            let size = match prefix & 0b11 {
-                0 => 0,
-                1 => 1,
-                2 => 2,
-                _ => 4,
-            };
-            let data = descriptor.get(pos..pos + size)?;
-            pos += size;
-            let value = data.iter().enumerate().fold(0_u32, |value, (index, byte)| value | (u32::from(*byte) << (8 * index)));
-            return Some(Item { kind: (prefix >> 2) & 0b11, tag: prefix >> 4, value });
-        }
-    })
-}
-
-/// What a descriptor says about a device, as far as 3D mouse support needs to know.
-#[derive(Clone, Debug, Default, PartialEq, Eq)]
-pub struct Descriptor {
-    multi_axis_controller: bool,
-    /// Distinct axes (X, Y, Z, Rx, Ry, Rz as bits 0..=5) that input report 1 carries.
-    motion_report_axes: u8,
-}
-
-impl Descriptor {
-    pub fn parse(descriptor: &[u8]) -> Self {
-        let mut summary = Self::default();
-        let mut page = 0_u32;
-        let mut report_id = 0_u8;
-        let mut depth = 0_u32;
-        // Local items belong to the next main item only.
-        let mut usages: Vec<u32> = Vec::new();
-        let mut usage_min = None;
-        for item in items(descriptor) {
-            match (item.kind, item.tag) {
-                // Global: usage page, report id.
-                (1, 0) => page = item.value,
-                (1, 8) => report_id = u8::try_from(item.value).unwrap_or(0),
-                // Local: usage, usage minimum, usage maximum.
-                (2, 0) => usages.push(Self::full_usage(page, item)),
-                (2, 1) => usage_min = Some(Self::full_usage(page, item)),
-                (2, 2) => {
-                    if let Some(min) = usage_min.take() {
-                        let max = Self::full_usage(page, item);
-                        let count = max.saturating_sub(min).min(MAX_USAGES_PER_ITEM - 1);
-                        usages.extend((0..=count).map(|offset| min.saturating_add(offset)));
-                    }
-                }
-                // Main: input, collection, end collection.
-                (0, 8) => {
-                    if report_id == MOTION_REPORT_ID || (report_id == 0 && depth > 0) {
-                        summary.note_axes(&usages);
-                    }
-                }
-                (0, 0xA) => {
-                    // An application collection (1) at the top level names the device.
-                    if depth == 0 && item.value == 1 && usages.first() == Some(&((PAGE_GENERIC_DESKTOP << 16) | USAGE_MULTI_AXIS_CONTROLLER)) {
-                        summary.multi_axis_controller = true;
-                    }
-                    depth += 1;
-                }
-                (0, 0xC) => depth = depth.saturating_sub(1),
-                _ => {}
-            }
-            if item.kind == 0 {
-                usages.clear();
-                usage_min = None;
-            }
-        }
-        summary
-    }
-
-    /// Usage items of up to two bytes name a usage on the current page, four bytes carry the page.
-    fn full_usage(page: u32, item: Item) -> u32 {
-        if item.value > 0xFFFF { item.value } else { (page << 16) | item.value }
-    }
-
-    fn note_axes(&mut self, usages: &[u32]) {
-        for usage in usages {
-            let axis = usage.wrapping_sub((PAGE_GENERIC_DESKTOP << 16) | FIRST_AXIS_USAGE);
-            if axis < AXIS_COUNT {
-                self.motion_report_axes |= 1 << axis;
-            }
-        }
-    }
-
-    /// True for a top-level Generic Desktop "Multi-Axis Controller" collection. This tells a
-    /// SpaceMouse's motion interface apart from its keyboard interface and from ordinary mice.
-    #[cfg_attr(not(target_os = "linux"), allow(dead_code))]
-    pub fn is_multi_axis_controller(&self) -> bool {
-        self.multi_axis_controller
-    }
-
-    /// `Combined` when input report 1 declares all six axes, otherwise `Split`.
-    pub fn layout(&self) -> Layout {
-        if self.motion_report_axes.count_ones() == AXIS_COUNT { Layout::Combined } else { Layout::Split }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// Report 1 = X Y Z, report 2 = Rx Ry Rz, each as three signed 16-bit values.
-    const SPLIT: &[u8] = &[
-        0x05, 0x01, // usage page: generic desktop
-        0x09, 0x08, // usage: multi-axis controller
-        0xA1, 0x01, // collection: application
-        0x85, 0x01, // report id 1
-        0x16, 0xA2, 0xFE, // logical minimum -350
-        0x26, 0x5E, 0x01, // logical maximum 350
-        0x75, 0x10, // report size 16
-        0x95, 0x03, // report count 3
-        0x09, 0x30, 0x09, 0x31, 0x09, 0x32, // X Y Z
-        0x81, 0x06, // input: data, variable, relative
-        0x85, 0x02, // report id 2
-        0x09, 0x33, 0x09, 0x34, 0x09, 0x35, // Rx Ry Rz
-        0x81, 0x06, // input
-        0xC0, // end collection
-    ];
-
-    /// Report 1 = X Y Z Rx Ry Rz.
-    const COMBINED: &[u8] = &[
-        0x05, 0x01, 0x09, 0x08, 0xA1, 0x01, 0x85, 0x01, // multi-axis controller, report id 1
-        0x16, 0xA2, 0xFE, 0x26, 0x5E, 0x01, 0x75, 0x10, 0x95, 0x06, // 6 x 16 bit, -350..350
-        0x09, 0x30, 0x09, 0x31, 0x09, 0x32, 0x09, 0x33, 0x09, 0x34, 0x09, 0x35, // X Y Z Rx Ry Rz
-        0x81, 0x06, 0xC0,
-    ];
-
-    /// The same six axes declared as a usage range, with report id 1 after the collection opens.
-    const COMBINED_RANGE: &[u8] = &[
-        0x05, 0x01, 0x09, 0x08, 0xA1, 0x01, 0x85, 0x01, 0x75, 0x10, 0x95, 0x06, //
-        0x19, 0x30, 0x29, 0x35, // usage minimum X, usage maximum Rz
-        0x81, 0x06, 0xC0,
-    ];
-
-    /// A boot keyboard-like interface: usage page 7 usages must not count as axes.
-    const KEYBOARD: &[u8] =
-        &[0x05, 0x01, 0x09, 0x06, 0xA1, 0x01, 0x05, 0x07, 0x19, 0xE0, 0x29, 0xE7, 0x15, 0x00, 0x25, 0x01, 0x75, 0x01, 0x95, 0x08, 0x81, 0x02, 0xC0];
-
-    /// An ordinary mouse: Generic Desktop X, Y but top-level usage is Mouse (2).
-    const MOUSE: &[u8] = &[
-        0x05, 0x01, 0x09, 0x02, 0xA1, 0x01, 0x09, 0x01, 0xA1, 0x00, 0x09, 0x30, 0x09, 0x31, 0x15, 0x81, 0x25, 0x7F, 0x75, 0x08, 0x95, 0x02, 0x81,
-        0x06, 0xC0, 0xC0,
-    ];
-
-    #[test]
-    fn split_descriptor_is_a_multi_axis_controller_with_three_axes_in_report_one() {
-        let descriptor = Descriptor::parse(SPLIT);
-        assert!(descriptor.is_multi_axis_controller());
-        assert_eq!(descriptor.motion_report_axes, 0b000_111);
-        assert_eq!(descriptor.layout(), Layout::Split);
-    }
-
-    #[test]
-    fn six_axes_in_report_one_are_a_combined_layout() {
-        for bytes in [COMBINED, COMBINED_RANGE] {
-            let descriptor = Descriptor::parse(bytes);
-            assert!(descriptor.is_multi_axis_controller());
-            assert_eq!(descriptor.layout(), Layout::Combined);
-        }
-    }
-
-    #[test]
-    fn other_interfaces_are_not_3d_mice() {
-        for bytes in [KEYBOARD, MOUSE, &[][..]] {
-            let descriptor = Descriptor::parse(bytes);
-            assert!(!descriptor.is_multi_axis_controller());
-            assert_eq!(descriptor.layout(), Layout::Split);
-        }
-    }
-
-    #[test]
-    fn four_byte_usages_carry_their_own_page() {
-        // Usage (4 bytes) 0x0007_0030 is on page 7, not an axis.
-        let descriptor = Descriptor::parse(&[0x05, 0x01, 0x09, 0x08, 0xA1, 0x01, 0x85, 0x01, 0x0B, 0x30, 0x00, 0x07, 0x00, 0x81, 0x06, 0xC0]);
-        assert!(descriptor.is_multi_axis_controller());
-        assert_eq!(descriptor.motion_report_axes, 0);
-    }
-
-    #[test]
-    fn truncated_and_hostile_descriptors_never_panic() {
-        for end in 0..=COMBINED.len() {
-            let _ = Descriptor::parse(&COMBINED[..end]);
-        }
-        // Long item with a length running past the end, huge usage ranges, deep nesting.
-        let _ = Descriptor::parse(&[0xFE, 0xFF, 0x00, 0x01]);
-        let _ = Descriptor::parse(&[0x05, 0x01, 0x1B, 0, 0, 0, 0, 0x2B, 0xFF, 0xFF, 0xFF, 0xFF, 0x81, 0x06]);
-        let _ = Descriptor::parse(&[0xC0; 64]);
-        let _ = Descriptor::parse(&[0xA1; 64]);
-        let mut state = 0x2545_F491_4F6C_DD1D_u64;
-        for _ in 0..200 {
-            let bytes: Vec<u8> = (0..64)
-                .map(|_| {
-                    state ^= state << 13;
-                    state ^= state >> 7;
-                    state ^= state << 17;
-                    state.to_le_bytes()[0]
-                })
-                .collect();
-            let _ = Descriptor::parse(&bytes);
-        }
-    }
-}

apps/solidcraft/src/space_mouse/hidraw.rs

@@ -1,10 +1,10 @@
 //! Finding a 3D mouse on Linux. The kernel exposes every HID interface as `/dev/hidrawN`, with
-//! its identity and report descriptor under `/sys/class/hidraw/hidrawN/device/`. Reading both is
-//! plain file I/O, so no udev or hidapi library is needed.
+//! its report descriptor and ids under `/sys/class/hidraw/hidrawN/device/`. Reading them is plain
+//! file I/O, so no udev or hidapi library is needed.
 
 use std::path::{Path, PathBuf};
 
-use super::hid_descriptor::{Descriptor, Layout};
+use solidcraft_space_mouse::{Descriptor, Layout};
 
 const SYSFS: &str = "/sys/class/hidraw";
 const DEV: &str = "/dev";
@@ -12,16 +12,11 @@ const DEV: &str = "/dev";
 pub struct Device {
     pub path: PathBuf,
     pub layout: Layout,
+    /// Its vendor and product ids, when the kernel gives them.
+    pub ids: Option<(u16, u16)>,
 }
 
-/// The vendor id from `HID_ID=<bus>:<vendor>:<product>` (all hexadecimal) in a sysfs `uevent`.
-fn vendor_id(uevent: &str) -> Option<u16> {
-    let id = uevent.lines().find_map(|line| line.strip_prefix("HID_ID="))?;
-    let vendor = id.split(':').nth(1)?;
-    u32::from_str_radix(vendor.trim(), 16).ok().and_then(|vendor| u16::try_from(vendor).ok())
-}
-
-/// The first hidraw interface that is a 3D mouse's multi-axis controller.
+/// The first hidraw interface that is a multi-axis controller with motion axes, whoever made it.
 pub fn find() -> Option<Device> {
     let mut names: Vec<_> = std::fs::read_dir(SYSFS).ok()?.filter_map(Result::ok).map(|entry| entry.file_name()).collect();
     names.sort();
@@ -29,12 +24,18 @@ pub fn find() -> Option<Device> {
 }
 
 fn probe(sysfs: &Path, path: PathBuf) -> Option<Device> {
-    let uevent = std::fs::read_to_string(sysfs.join("device/uevent")).ok()?;
-    if !super::is_3d_mouse_vendor(vendor_id(&uevent)?) {
-        return None;
-    }
     let descriptor = Descriptor::parse(&std::fs::read(sysfs.join("device/report_descriptor")).ok()?);
-    descriptor.is_multi_axis_controller().then(|| Device { path, layout: descriptor.layout() })
+    // A controller that declares no motion axis (buttons only, say) isn't read.
+    let layout = descriptor.is_multi_axis_controller().then(|| descriptor.layout()).flatten()?;
+    let ids = std::fs::read_to_string(sysfs.join("device/uevent")).ok().as_deref().and_then(ids);
+    Some(Device { path, layout, ids })
+}
+
+/// The vendor and product ids in a HID device's uevent: `HID_ID=bus:vendor:product`, in hex.
+fn ids(uevent: &str) -> Option<(u16, u16)> {
+    let id = uevent.lines().find_map(|line| line.strip_prefix("HID_ID="))?;
+    let mut hex = id.split(':').skip(1).map(|part| u32::from_str_radix(part, 16).ok().and_then(|v| u16::try_from(v).ok()));
+    Some((hex.next()??, hex.next()??))
 }
 
 #[cfg(test)]
@@ -42,16 +43,11 @@ mod tests {
     use super::*;
 
     #[test]
-    fn reads_the_vendor_from_the_hid_id() {
-        let uevent = "DRIVER=hid-generic\nHID_ID=0003:0000256F:0000C631\nHID_NAME=Some Device\n";
-        assert_eq!(vendor_id(uevent), Some(0x256f));
-        assert_eq!(vendor_id("HID_ID=0003:0000046D:0000C077"), Some(0x046d));
-    }
-
-    #[test]
-    fn malformed_ids_are_rejected() {
-        for uevent in ["", "HID_NAME=x", "HID_ID=", "HID_ID=0003", "HID_ID=0003:zzzz:0001", "HID_ID=0003:FFFFFFFF:0001"] {
-            assert_eq!(vendor_id(uevent), None, "{uevent:?}");
-        }
+    fn ids_come_from_the_uevent() {
+        let wireless = "DRIVER=hid-generic\nHID_ID=0005:0000256F:0000C63A\nHID_NAME=SpaceMouse Wireless BT\n";
+        assert_eq!(ids(wireless), Some((0x256f, 0xc63a)));
+        assert_eq!(ids("HID_ID=0003:0000046D\n"), None);
+        assert_eq!(ids("HID_ID=0003:0001046D:0000C62B\n"), None, "a vendor past 16 bits isn't a USB id");
+        assert_eq!(ids("HID_NAME=keyboard\n"), None);
     }
 }

apps/solidcraft/src/space_mouse/spacenavd.rs

@@ -0,0 +1,144 @@
+//! Reading a 3D mouse through `spacenavd` on Linux. The daemon owns the device and applies what
+//! `spnavcfg` sets (swapped and inverted axes, sensitivity, dead zones) before it hands the motion
+//! to its clients, so a program that reads the HID device itself bypasses that setup. Over its
+//! socket the daemon sends fixed 32-byte records: eight native-endian `i32`, the first the kind of
+//! record (0 for motion, then x y z rx ry rz and the milliseconds since the last record).
+//! Other records (button presses, from newer daemons also configuration changes) are ignored.
+//!
+//! The socket is plain file I/O, so no library is needed, and it needs no udev rule: the daemon
+//! is what has access to the device.
+
+use std::io::Read;
+use std::os::unix::net::UnixStream;
+use std::path::Path;
+
+use solidcraft_ui_egui::space_mouse::{Axes, FULL_SCALE};
+
+/// Where the daemon listens. `/var/run` is a link to `/run` on current systems.
+const SOCKETS: [&str; 2] = ["/var/run/spnav.sock", "/run/spnav.sock"];
+
+const RECORD_BYTES: usize = 32;
+
+/// What the daemon reports at full deflection (seen with a SpaceMouse Compact and a default
+/// sensitivity). Our axes are in the raw HID units of [`FULL_SCALE`].
+const DAEMON_FULL_SCALE: i64 = 500;
+
+pub fn connect() -> Option<UnixStream> {
+    SOCKETS.iter().find_map(|path| connect_to(Path::new(path)))
+}
+
+fn connect_to(path: &Path) -> Option<UnixStream> {
+    UnixStream::connect(path).ok()
+}
+
+/// The axes of one record, or `None` for a record that is not motion.
+///
+/// The daemon's frame is right-handed with x to the right, y away from the user and z up; ours is
+/// the device's raw one, x right, y towards the user and z down, so y and z (and the rotations
+/// about them) change sign. With nothing set in `spnavcfg` the two give the same motion; what
+/// the user swaps or inverts there then carries over.
+fn decode(record: &[u8; RECORD_BYTES]) -> Option<Axes> {
+    let mut data = [0_i32; 8];
+    for (slot, bytes) in data.iter_mut().zip(record.as_chunks::<4>().0) {
+        *slot = i32::from_ne_bytes(*bytes);
+    }
+    let [kind, x, y, z, rx, ry, rz, _period] = data;
+    (kind == 0).then(|| Axes {
+        translation: [unit(x), unit(-i64::from(y)), unit(-i64::from(z))],
+        rotation: [unit(rx), unit(-i64::from(ry)), unit(-i64::from(rz))],
+    })
+}
+
+/// A daemon value in our raw units. Out-of-range values stay in `i16`: they are input from another
+/// process.
+fn unit(value: impl Into<i64>) -> i16 {
+    let scaled = value.into() * i64::from(FULL_SCALE) / DAEMON_FULL_SCALE;
+    i16::try_from(scaled.clamp(i64::from(i16::MIN), i64::from(i16::MAX))).unwrap_or_default()
+}
+
+/// Hands every motion record to `publish` until the daemon closes the connection or fails. A
+/// partial record at the end is dropped.
+pub fn read(mut stream: impl Read, mut publish: impl FnMut(Axes)) {
+    let mut record = [0_u8; RECORD_BYTES];
+    loop {
+        match stream.read_exact(&mut record) {
+            Ok(()) => {
+                if let Some(axes) = decode(&record) {
+                    publish(axes);
+                }
+            }
+            Err(error) if error.kind() == std::io::ErrorKind::Interrupted => {}
+            Err(error) => {
+                log::info!("3D mouse: spacenavd connection ended: {error}");
+                return;
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io::Write;
+
+    fn record(data: [i32; 8]) -> [u8; RECORD_BYTES] {
+        let mut bytes = [0_u8; RECORD_BYTES];
+        for (chunk, value) in bytes.as_chunks_mut::<4>().0.iter_mut().zip(data) {
+            *chunk = value.to_ne_bytes();
+        }
+        bytes
+    }
+
+    #[test]
+    fn motion_records_become_axes_in_the_devices_raw_frame() {
+        // Full deflection of the daemon's x, y and z is the device's full scale, and y and z flip.
+        assert_eq!(decode(&record([0, 500, 500, 500, 0, 0, 0, 8])), Some(Axes { translation: [350, -350, -350], rotation: [0; 3] }));
+        // Rotations follow translations: right-handed in both frames, so ry and rz flip as y and z do.
+        assert_eq!(decode(&record([0, 0, 0, 0, 250, 250, 250, 8])), Some(Axes { translation: [0; 3], rotation: [175, -175, -175] }));
+        // Rest is a motion record of zeros.
+        assert_eq!(decode(&record([0, 0, 0, 0, 0, 0, 0, 1200])), Some(Axes::default()));
+    }
+
+    #[test]
+    fn what_spnavcfg_swaps_reaches_the_view() {
+        // The daemon sends a push away as y. With Y and Z swapped in spnavcfg it sends the same push
+        // as z, and the view gets a lift (raw z) instead of the zoom (raw y).
+        let before = decode(&record([0, 0, 500, 0, 0, 0, 0, 8])).map(|axes| axes.translation);
+        let after = decode(&record([0, 0, 0, 500, 0, 0, 0, 8])).map(|axes| axes.translation);
+        assert_eq!(before, Some([0, -350, 0]));
+        assert_eq!(after, Some([0, 0, -350]));
+    }
+
+    #[test]
+    fn other_records_and_hostile_values_are_harmless() {
+        // A button record (kind 1, press) and one of an unknown kind are not motion.
+        assert_eq!(decode(&record([1, 0, 1, 0, 0, 0, 0, 0])), None);
+        assert_eq!(decode(&record([7, 500, 500, 500, 500, 500, 500, 0])), None);
+        // Nothing overflows on the extremes of `i32`.
+        let extreme = decode(&record([0, i32::MIN, i32::MIN, i32::MAX, i32::MAX, i32::MIN, i32::MIN, -1]));
+        assert_eq!(extreme.map(|axes| axes.translation[0]), Some(i16::MIN));
+        assert_eq!(extreme.map(|axes| axes.translation[1]), Some(i16::MAX));
+        assert_eq!(extreme.map(|axes| axes.rotation[0]), Some(i16::MAX));
+    }
+
+    #[test]
+    fn a_stream_is_read_record_by_record_until_it_ends() {
+        let (mut daemon, client) = UnixStream::pair().expect("a socket pair");
+        let mut bytes = Vec::new();
+        bytes.extend(record([0, 100, 0, 0, 0, 0, 0, 8]));
+        bytes.extend(record([2, 1, 0, 0, 0, 0, 0, 0])); // a button release: skipped
+        bytes.extend(record([0, 0, 0, 0, 0, 0, 0, 900]));
+        bytes.extend([1, 2, 3]); // the daemon went away mid-record
+        daemon.write_all(&bytes).expect("written");
+        drop(daemon);
+        let mut seen = Vec::new();
+        read(client, |axes| seen.push(axes.translation));
+        assert_eq!(seen, [[70, 0, 0], [0, 0, 0]]);
+    }
+
+    #[test]
+    fn no_daemon_means_no_connection() {
+        let missing = std::env::temp_dir().join(format!("sc-no-spnav-{}.sock", std::process::id()));
+        assert!(connect_to(&missing).is_none());
+    }
+}

apps/solidcraft/src/startup.rs

@@ -0,0 +1,342 @@
+//! Getting the window open, whatever state the settings folder or the graphics device is in
+//! (docs/book/src/guide/troubleshooting.md).
+//!
+//! - **Settings that don't read** (`app.ron`, `graphics.json`): moved aside as
+//!   `<name>.bad-<time>` and the app starts with defaults, instead of a newer or damaged file
+//!   being dropped silently or stopping the start.
+//! - **Launches that die before the window is up**: a marker file counts them; after two in a
+//!   row the next launch starts in safe mode by itself.
+//! - **Safe mode** (`--safe-mode` or `SOLIDCRAFT_SAFE_MODE=1`): default settings (the saved ones
+//!   are left untouched), no recovery offer, the software renderer and CPU meshing.
+//! - **No usable graphics device**: one retry on the software renderer
+//!   (`SOLIDCRAFT_RENDERER=cpu`), then a message box saying what failed and what to try.
+
+use std::path::{Path, PathBuf};
+
+/// The environment variable that starts safe mode (any value but `0` or empty).
+pub const SAFE_MODE_ENV: &str = "SOLIDCRAFT_SAFE_MODE";
+/// `SOLIDCRAFT_RENDERER=cpu` picks the software renderer (WARP, lavapipe, llvmpipe).
+pub const RENDERER_ENV: &str = "SOLIDCRAFT_RENDERER";
+/// Consecutive launches that died before the window was up, after which safe mode starts.
+pub const FAILED_STARTS_FOR_SAFE_MODE: u32 = 2;
+const MARKER: &str = "starting";
+
+/// Whether an environment value switches something on.
+pub fn env_on(v: Option<&str>) -> bool {
+    v.map(str::trim).is_some_and(|v| !v.is_empty() && v != "0" && !v.eq_ignore_ascii_case("false"))
+}
+
+/// Whether `SOLIDCRAFT_RENDERER` asks for the software renderer.
+pub fn cpu_renderer_env(v: Option<&str>) -> bool {
+    v.map(str::trim).is_some_and(|v| v.eq_ignore_ascii_case("cpu") || v.eq_ignore_ascii_case("software"))
+}
+
+fn unix_now() -> u64 {
+    std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map_or(0, |d| d.as_secs())
+}
+
+/// Move `path` aside as `<name>.bad-<time>` (kept for a bug report); returns where it went.
+pub fn back_up(path: &Path) -> std::io::Result<PathBuf> {
+    let name = path.file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "settings".into());
+    let mut to = path.with_file_name(format!("{name}.bad-{}", unix_now()));
+    let mut n = 1;
+    while to.exists() && n < 100 {
+        to = path.with_file_name(format!("{name}.bad-{}-{n}", unix_now()));
+        n += 1;
+    }
+    std::fs::rename(path, &to)?;
+    Ok(to)
+}
+
+/// Whether eframe's `app.ron` reads, with the preferences inside it.
+fn app_ron_reads(text: &str, prefs_keys: &[&str]) -> bool {
+    let Ok(kv) = ron::from_str::<std::collections::HashMap<String, String>>(text) else { return false };
+    prefs_keys.iter().filter_map(|k| kv.get(*k)).all(|p| serde_json::from_str::<serde_json::Value>(p).is_ok_and(|v| v.is_object()))
+}
+
+/// Check the settings files in `dir` before anything reads them: one that doesn't read is moved
+/// aside (the app then starts with defaults for it). Returns a line per file moved.
+pub fn check_settings(dir: &Path, prefs_keys: &[&str]) -> Vec<String> {
+    let mut notes = Vec::new();
+    let mut check = |name: &str, reads: &dyn Fn(&str) -> bool| {
+        let path = dir.join(name);
+        let Ok(bytes) = std::fs::read(&path) else { return };
+        let ok = std::str::from_utf8(&bytes).is_ok_and(|t| t.trim().is_empty() || reads(t));
+        if ok {
+            return;
+        }
+        match back_up(&path) {
+            Ok(to) => {
+                log::warn!("settings: {} did not read; moved to {}", path.display(), to.display());
+                notes.push(format!("{name} could not be read and was moved to {}; defaults are used.", to.display()));
+            }
+            Err(e) => log::warn!("settings: {} did not read and could not be moved: {e}", path.display()),
+        }
+    };
+    check("app.ron", &|t| app_ron_reads(t, prefs_keys));
+    check("graphics.json", &|t| serde_json::from_str::<serde_json::Value>(t).is_ok_and(|v| v.is_object()));
+    notes
+}
+
+/// A launch begins: count it in the marker in `dir`. Returns how many launches before this one
+/// died before their window was up.
+pub fn begin(dir: &Path) -> u32 {
+    let marker = dir.join(MARKER);
+    let before = std::fs::read_to_string(&marker).ok().and_then(|s| s.trim().parse::<u32>().ok()).unwrap_or(0).min(1000);
+    if std::fs::create_dir_all(dir).is_ok() {
+        let _ = std::fs::write(&marker, (before + 1).to_string());
+    }
+    before
+}
+
+/// The window is up: this launch did not fail to start.
+pub fn started(dir: &Path) {
+    let _ = std::fs::remove_file(dir.join(MARKER));
+}
+
+/// The software adapter among `adapters` (WARP on Windows, lavapipe or llvmpipe elsewhere), else
+/// the first one that can draw to `surface`.
+pub fn pick_cpu_adapter(adapters: &[eframe::wgpu::Adapter], surface: Option<&eframe::wgpu::Surface<'_>>) -> Result<eframe::wgpu::Adapter, String> {
+    let fits = |a: &&eframe::wgpu::Adapter| surface.is_none_or(|s| a.is_surface_supported(s));
+    adapters
+        .iter()
+        .filter(fits)
+        .find(|a| a.get_info().device_type == eframe::wgpu::DeviceType::Cpu)
+        .or_else(|| adapters.iter().find(fits))
+        .cloned()
+        .ok_or_else(|| {
+            let names: Vec<String> = adapters.iter().map(|a| format!("{} ({:?})", a.get_info().name, a.get_info().backend)).collect();
+            format!("no graphics adapter can draw the window (found: {})", if names.is_empty() { "none".into() } else { names.join(", ") })
+        })
+}
+
+/// `WGPU_BACKEND`: when set, wgpu picks the backends from it and the order below is not used.
+pub const WGPU_BACKEND_ENV: &str = "WGPU_BACKEND";
+
+/// The graphics backends to start with, or `None` to leave it to wgpu (`WGPU_BACKEND`, or all
+/// the backends it was built with).
+///
+/// On Windows, D3D12 comes first, then Vulkan, then OpenGL, and only the first one with a
+/// hardware adapter is started at all. wgpu would otherwise start Vulkan, D3D12 and OpenGL
+/// together and prefer Vulkan, and starting Vulkan loads every installed Vulkan driver: Intel's
+/// (`igvk64.dll`) crashed SolidCraft at startup that way, inside the driver, before anything
+/// could be reported. D3D12 is Windows' own graphics API, the one its drivers are tested with.
+/// `has_hardware(backends)` says whether those backends have an adapter that isn't software
+/// (it is only asked about the backends being tried, one at a time).
+///
+/// - `WGPU_BACKEND` set (`env_set`): `None`, whatever it says wins.
+/// - The software renderer (`cpu`, safe mode): D3D12 alone on Windows (WARP); `None` elsewhere.
+/// - `preference` (`graphics.json`'s `backend`: `dx12`, `vulkan`, `gl` or a comma list; `auto`
+///   or empty for the order above): those backends, on any system.
+/// - Elsewhere than Windows: `None`.
+/// - No hardware adapter at all: D3D12 (WARP, Windows' software renderer).
+pub fn choose_backends(
+    windows: bool,
+    env_set: bool,
+    cpu: bool,
+    preference: Option<&str>,
+    mut has_hardware: impl FnMut(eframe::wgpu::Backends) -> bool,
+) -> Option<eframe::wgpu::Backends> {
+    use eframe::wgpu::Backends;
+    if env_set {
+        return None;
+    }
+    if cpu {
+        return windows.then_some(Backends::DX12);
+    }
+    if let Some(p) = preference.map(str::trim).filter(|p| !p.is_empty() && !p.eq_ignore_ascii_case("auto")) {
+        let chosen = Backends::from_comma_list(p);
+        if !chosen.is_empty() {
+            return Some(chosen);
+        }
+        log::warn!("graphics: unknown backend preference `{p}`; using the default order");
+    }
+    if !windows {
+        return None;
+    }
+    Some(WINDOWS_ORDER.into_iter().find(|b| has_hardware(*b)).unwrap_or(Backends::DX12))
+}
+
+/// The device feature for a 32-bit float depth buffer with a stencil (reversed depth, #1434).
+pub const FLOAT_DEPTH_STENCIL: eframe::wgpu::Features = eframe::wgpu::Features::DEPTH32FLOAT_STENCIL8;
+
+/// Whether every adapter `options` could start offers a float depth buffer with a stencil. eframe
+/// makes the window's depth buffer from the depth bits before it picks the adapter, so the window
+/// asks for a float one only when whichever it picks has it.
+pub fn float_depth_everywhere(options: &eframe::egui_wgpu::WgpuConfiguration) -> bool {
+    let eframe::egui_wgpu::WgpuSetup::CreateNew(setup) = &options.wgpu_setup else { return false };
+    let mut desc = eframe::wgpu::InstanceDescriptor::new_without_display_handle_from_env();
+    desc.backends = setup.instance_descriptor.backends;
+    let instance = eframe::wgpu::Instance::new(desc);
+    let adapters = pollster::block_on(instance.enumerate_adapters(setup.instance_descriptor.backends));
+    let all = !adapters.is_empty() && adapters.iter().all(|a| a.features().contains(FLOAT_DEPTH_STENCIL));
+    log::info!("graphics: float depth with stencil on every adapter: {all}");
+    all
+}
+
+/// The order backends are tried in on Windows.
+pub const WINDOWS_ORDER: [eframe::wgpu::Backends; 3] = [eframe::wgpu::Backends::DX12, eframe::wgpu::Backends::VULKAN, eframe::wgpu::Backends::GL];
+
+/// Whether `backends` (started on their own, nothing else) have a hardware adapter.
+pub fn has_hardware_adapter(backends: eframe::wgpu::Backends) -> bool {
+    let mut desc = eframe::wgpu::InstanceDescriptor::new_without_display_handle();
+    desc.backends = backends;
+    desc.flags = eframe::wgpu::InstanceFlags::from_build_config().with_env();
+    let instance = eframe::wgpu::Instance::new(desc);
+    let adapters = pollster::block_on(instance.enumerate_adapters(backends));
+    let found: Vec<String> = adapters.iter().map(|a| format!("{} ({:?})", a.get_info().name, a.get_info().device_type)).collect();
+    log::info!("graphics: {backends:?} adapters: {found:?}");
+    adapters.iter().any(|a| a.get_info().device_type != eframe::wgpu::DeviceType::Cpu)
+}
+
+/// The message shown when no window could be opened at all.
+pub fn no_window_message(error: &str, settings: Option<&Path>) -> String {
+    let folder = settings.map(|d| d.display().to_string()).unwrap_or_else(|| "the SolidCraft settings folder".into());
+    format!(
+        "SolidCraft could not open its window.\n\n{error}\n\n\
+         The software renderer was tried too. Things to try:\n\
+         - Install or update the graphics driver (on Windows, from the GPU maker's site rather than Windows Update).\n\
+         - Over Remote Desktop or in a virtual machine, enable 3D acceleration or run it on the machine itself.\n\
+         - Start it once with `solidcraft --safe-mode`.\n\
+         - Rename the settings folder: {folder}\n\n\
+         More: https://docs.solidcraft.io/guide/troubleshooting.html"
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn scratch(name: &str) -> PathBuf {
+        let d = std::env::temp_dir().join(format!("solidcraft-startup-{name}-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&d);
+        std::fs::create_dir_all(&d).unwrap();
+        d
+    }
+
+    #[test]
+    fn switches_read_from_the_environment() {
+        assert!(env_on(Some("1")) && env_on(Some("yes")) && !env_on(Some("0")) && !env_on(Some(" ")) && !env_on(None) && !env_on(Some("false")));
+        assert!(cpu_renderer_env(Some("cpu")) && cpu_renderer_env(Some("Software")) && !cpu_renderer_env(Some("gpu")) && !cpu_renderer_env(None));
+    }
+
+    #[test]
+    fn settings_that_do_not_read_are_moved_aside_and_good_ones_stay() {
+        let keys = ["solidcraft.prefs", "solvecraft.prefs"];
+        let d = scratch("check");
+        // Good files (and an empty one) stay where they are.
+        std::fs::write(d.join("app.ron"), r#"{"solidcraft.prefs": "{\"grid\":true}", "egui": "(anything)"}"#).unwrap();
+        std::fs::write(d.join("graphics.json"), r#"{"msaa":4}"#).unwrap();
+        assert!(check_settings(&d, &keys).is_empty());
+        assert!(d.join("app.ron").is_file() && d.join("graphics.json").is_file());
+        // Damaged RON, preferences that aren't JSON, a truncated graphics.json, non-UTF-8 bytes.
+        for (name, text) in [
+            ("app.ron", b"{\"solidcraft.prefs\": \"{\\\"gr".as_slice()),
+            ("app.ron", br#"{"solvecraft.prefs": "not json"}"#.as_slice()),
+            ("graphics.json", br#"{"msaa":"#.as_slice()),
+            ("graphics.json", b"\xff\xfe\x00".as_slice()),
+        ] {
+            std::fs::write(d.join(name), text).unwrap();
+            let notes = check_settings(&d, &keys);
+            assert_eq!(notes.len(), 1, "{name}: {notes:?}");
+            assert!(!d.join(name).exists(), "{name} moved");
+            let kept: Vec<_> =
+                std::fs::read_dir(&d).unwrap().flatten().filter(|e| e.file_name().to_string_lossy().starts_with(&format!("{name}.bad-"))).collect();
+            assert!(kept.iter().any(|e| std::fs::read(e.path()).unwrap() == text), "{name}: the bad file is kept");
+        }
+        let _ = std::fs::remove_dir_all(&d);
+    }
+
+    #[test]
+    fn launches_that_never_got_a_window_are_counted_until_one_does() {
+        let d = scratch("marker");
+        assert_eq!(begin(&d), 0);
+        assert_eq!(begin(&d), 1);
+        assert_eq!(begin(&d), FAILED_STARTS_FOR_SAFE_MODE);
+        started(&d);
+        assert_eq!(begin(&d), 0);
+        // A damaged marker counts as none.
+        std::fs::write(d.join(MARKER), "zz").unwrap();
+        assert_eq!(begin(&d), 0);
+        let _ = std::fs::remove_dir_all(&d);
+    }
+
+    #[test]
+    fn windows_starts_d3d12_first_and_vulkan_only_when_d3d12_has_no_gpu() {
+        use eframe::wgpu::Backends;
+        let probe = |with: &'static [Backends]| {
+            move |b: Backends| {
+                assert!(b == Backends::DX12 || b == Backends::VULKAN || b == Backends::GL, "one backend at a time: {b:?}");
+                with.contains(&b)
+            }
+        };
+        // D3D12 works: Vulkan and OpenGL are never even asked about (starting Vulkan loads
+        // its drivers, which is what crashed).
+        let mut asked = Vec::new();
+        let chosen = choose_backends(true, false, false, None, |b| {
+            asked.push(b);
+            b == Backends::DX12
+        });
+        assert_eq!(chosen, Some(Backends::DX12));
+        assert_eq!(asked, [Backends::DX12]);
+        // Everything works: still D3D12 alone.
+        assert_eq!(choose_backends(true, false, false, None, probe(&[Backends::DX12, Backends::VULKAN, Backends::GL])), Some(Backends::DX12));
+        // No D3D12 hardware adapter: Vulkan, else OpenGL, else D3D12's software adapter (WARP).
+        assert_eq!(choose_backends(true, false, false, None, probe(&[Backends::VULKAN, Backends::GL])), Some(Backends::VULKAN));
+        assert_eq!(choose_backends(true, false, false, None, probe(&[Backends::GL])), Some(Backends::GL));
+        assert_eq!(choose_backends(true, false, false, None, probe(&[])), Some(Backends::DX12));
+        // `auto` and blanks are the default order.
+        assert_eq!(choose_backends(true, false, false, Some(" auto "), probe(&[Backends::DX12])), Some(Backends::DX12));
+        assert_eq!(choose_backends(true, false, false, Some(""), probe(&[Backends::GL])), Some(Backends::GL));
+    }
+
+    #[test]
+    fn wgpu_backend_the_preference_and_the_software_renderer_override_the_order() {
+        use eframe::wgpu::Backends;
+        let never = |b: Backends| -> bool { panic!("no probing expected, asked about {b:?}") };
+        // WGPU_BACKEND: wgpu reads it itself, nothing is probed.
+        assert_eq!(choose_backends(true, true, false, Some("gl"), never), None);
+        assert_eq!(choose_backends(true, true, true, None, never), None);
+        // The software renderer (safe mode, the retry): WARP through D3D12 alone, never Vulkan.
+        assert_eq!(choose_backends(true, false, true, Some("vulkan"), never), Some(Backends::DX12));
+        assert_eq!(choose_backends(false, false, true, None, never), None);
+        // The preference, on any system, without probing.
+        assert_eq!(choose_backends(true, false, false, Some("vulkan"), never), Some(Backends::VULKAN));
+        assert_eq!(choose_backends(true, false, false, Some("GL"), never), Some(Backends::GL));
+        assert_eq!(choose_backends(true, false, false, Some("dx12,vulkan"), never), Some(Backends::DX12 | Backends::VULKAN));
+        assert_eq!(choose_backends(false, false, false, Some("vulkan"), never), Some(Backends::VULKAN));
+        // An unknown preference is the default order.
+        assert_eq!(choose_backends(true, false, false, Some("glide"), |b| b == Backends::DX12), Some(Backends::DX12));
+        // Elsewhere: wgpu's own choice.
+        assert_eq!(choose_backends(false, false, false, None, never), None);
+        assert_eq!(choose_backends(false, false, false, Some("auto"), never), None);
+    }
+
+    #[test]
+    fn probing_a_backend_alone_never_panics() {
+        // Whatever this machine has (often nothing): an answer, not a crash.
+        for b in WINDOWS_ORDER {
+            let _ = has_hardware_adapter(b);
+        }
+    }
+
+    #[test]
+    fn the_message_names_the_settings_folder_and_safe_mode() {
+        let m = no_window_message("no adapter", Some(Path::new("/x/SolidCraft")));
+        assert!(m.contains("no adapter") && m.contains("/x/SolidCraft") && m.contains("--safe-mode"));
+    }
+
+    #[test]
+    fn the_software_adapter_is_preferred_and_its_absence_is_an_error_not_a_panic() {
+        assert!(pick_cpu_adapter(&[], None).unwrap_err().contains("none"));
+        let instance = eframe::wgpu::Instance::new(eframe::wgpu::InstanceDescriptor::new_without_display_handle());
+        let adapters = pollster::block_on(instance.enumerate_adapters(eframe::wgpu::Backends::all()));
+        if adapters.is_empty() {
+            return;
+        }
+        let picked = pick_cpu_adapter(&adapters, None).unwrap();
+        if adapters.iter().any(|a| a.get_info().device_type == eframe::wgpu::DeviceType::Cpu) {
+            assert_eq!(picked.get_info().device_type, eframe::wgpu::DeviceType::Cpu);
+        }
+    }
+}

assets/AGENTS.md

@@ -0,0 +1,22 @@
+# Resource work — mandatory
+
+Read `assets/README.md` before changing media, fonts, artwork or their consumers.
+For **any UI icon, icon assignment or review-tool change**, also read
+`assets/icons/ui/AGENTS.md` and `assets/icons/ui/STYLE_GUIDE.md` before editing.
+These files are the specification; chat history and old previews are not required.
+
+- Keep one editable authority per resource. UI SVGs are masters, not exports of a
+  second competing drawing library. `source/` retains genuine native source and
+  the separately compiled Rust viewport glyphs.
+- Keep only production inputs, necessary shipped exports, authoring tools and
+  provenance here. Put screenshots, contact sheets, audits, caches, test output,
+  review inbox files and package staging under ignored `target/`.
+- Do not add historical alternatives, duplicate resolutions that packaging does
+  not consume, copied screenshots, `node_modules`, Python bytecode or generated
+  inventory CSVs to this collection. Preserve native editable source documents.
+- Add an exact `ATTRIBUTION.md` row for every non-Markdown asset, including tool
+  code, web UI sources and metadata. Remove rows for intentionally retired files.
+- Never copy or derive iconography from commercial CAD products. Use original
+  SolidCraft artwork, analytic geometry and the approved local references.
+- Run `cargo xtask assets` and `cargo xtask icons`. Full repository gates still
+  apply before a commit. Never refresh acceptance hashes to bypass a failed check.

assets/README.md

@@ -1,41 +1,101 @@
-# SolidCraft macOS icon
+# Application resources
 
-`SolidCraft.icon/` is the approved Icon Composer source, containing separate
-grid and solid SVG layers and the owner's appearance settings. The saturated
-blue solid has transparent geometry cutouts instead of painted edge lines.
-The solid and grid are both scaled to 90%, with separate Default and Dark grid artwork.
-Icon Composer supplies the system backdrop and Mono material effects.
-Artwork is original and attributed in `ATTRIBUTION.md`.
+`assets/` is the design resource home for SolidCraft.
+[ATTRIBUTION.md](../ATTRIBUTION.md) is the file inventory and provenance record.
+Keep one editable master per resource and place shipped derivatives in `exports/`.
 
-`Assets.car` is compiled by Apple's `actool` and supplies the layered icon on
-macOS 26 and later. It is checked in so the existing release workflow can still
-package on older Xcode runners. After editing and saving `SolidCraft.icon`,
-regenerate the catalog with Xcode 26 or later from the repository root:
-
-```sh
-mkdir -p target/macos-icon
-xcrun actool assets/SolidCraft.icon \
-  --compile target/macos-icon --platform macosx \
-  --minimum-deployment-target 11.0 --app-icon SolidCraft \
-  --output-partial-info-plist target/macos-icon/icon-info.plist \
-  --output-format human-readable-text
-cp target/macos-icon/Assets.car assets/Assets.car
-cp target/macos-icon/SolidCraft.icns assets/icon.icns
+```text
+assets/
+  icons/
+    app/
+      shared/source/                 # original Rust mark and executable ICO encoder
+      macos/source/SolidCraft.icon/   # approved Composer project and linked SVGs
+      macos/exports/                 # paired Assets.car and icon.icns
+      windows/exports/               # executable DIB ICO and installer PNG ICO
+      linux/exports/hicolor/         # Linux/FreeBSD package images, 16–512 px
+    ui/design/svg/                   # authoritative original UI icon masters
+    ui/design/tools/                 # authoring bases, checks and included review app
+    ui/source/                       # Rust viewport glyphs, markers and navigation
+  branding/web/source/og.png          # shared social preview card
+  styles/ui/palettes.rs               # light/dark defaults
+  styles/web/loading.css             # web loading/canvas styles
+  appearances/library.rs             # built-in visual presets
+  materials/library.rs               # physical defaults and colours
+  shaders/viewport.wgsl               # original viewport shader
+  fonts/{liberation-sans,biz-udp-gothic}/ # unmodified fonts and OFL licences
+  locales/{en,de,ja,ko}.json          # shared offline catalogs
+  platforms/{macos,linux,windows}/    # bundle, freedesktop and WiX templates
+  archive/icons/macos-v1/
+    source/icon.vectorcraft          # earlier editable work, retained
+                                     # redundant historical exports are retired
 ```
 
-`icon.icns` is the older-macOS fallback generated by the same Apple compiler
-from the approved composition, retaining its layer sizes and positions.
-Regenerate both compiled resources together with the commands above.
-`icon.vectorcraft`, `icon.svg`, `icon.png` and `icon.iconset/` retain the earlier
-VectorCraft artwork; packaging uses the Icon Composer compilation instead.
+## Editing and regeneration
 
-Only `packaging/macos/package.sh` consumes these resources. Its existing signed
-app/DMG workflow copies the catalog and ICNS into `Contents/Resources`, and
-`Info.plist` references `SolidCraft` through `CFBundleIconName` and
-`CFBundleIconFile`. The macOS viewport opts out of eframe's runtime bitmap so
-Finder, the Dock and the application switcher use the bundle icon. Other
-platforms retain the existing code-drawn icon and packaging.
+[UI artwork](icons/ui/README.md) identifies the drawing masters and their consumers.
+Read the mandatory [UI style guide](icons/ui/STYLE_GUIDE.md) before editing an icon.
+Edit SVG geometry and its command/UI assignments together; inspect both themes
+and small sizes. Temporary media and generated reports belong in ignored target/. Palettes and model presets are also editable Rust data.
 
-Design references: [Apple app-icon HIG](https://developer.apple.com/design/human-interface-guidelines/app-icons)
-and [Icon Composer documentation](https://developer.apple.com/documentation/xcode/creating-your-app-icon-using-icon-composer).
-No Apple artwork is shipped.
+The current macOS master is `icons/app/macos/source/SolidCraft.icon/`, including
+its linked SVG layers and appearance settings. The earlier VectorCraft document
+is preserved in the archive. No other native design projects were available for
+the current UI set or preview card. Keep any future `.vectorcraft`, `.ai` or other
+native work and linked inputs under that resource's `source/work/`, with an
+attribution row; retain the editable document alongside its exports.
+
+Regenerate all exports of the shared Windows/Linux/FreeBSD mark together:
+
+```sh
+cargo xtask app-icons
+```
+
+For macOS, use Xcode with Icon Composer support:
+
+```sh
+mkdir -p target/resources/macos-icon
+xcrun actool assets/icons/app/macos/source/SolidCraft.icon \
+  --compile target/resources/macos-icon --platform macosx \
+  --minimum-deployment-target 11.0 --app-icon SolidCraft \
+  --output-partial-info-plist target/resources/macos-icon/icon-info.plist \
+  --output-format human-readable-text
+cp target/resources/macos-icon/Assets.car assets/icons/app/macos/exports/Assets.car
+cp target/resources/macos-icon/SolidCraft.icns assets/icons/app/macos/exports/icon.icns
+```
+
+Review and commit source changes and required exports together. Temporary renders,
+tool caches and package staging belong under ignored `target/` or `dist/`.
+Normal builds use the committed exports and require no design applications.
+The CLI still supports arbitrary PNG/ICO exports with `solidcraft-cli icon`.
+
+## Platform bindings
+
+| Platform | Resources and output paths |
+| --- | --- |
+| macOS | Composer master and paired exports; bundle installs `Assets.car` and `SolidCraft.icns` |
+| Windows executable | `solidcraft-executable.ico`: original DIB/mask representations at 16/24/32/48/64/128/256 px |
+| Windows installer | `solidcraft.ico`: PNG representations at 16/20/24/32/40/48/64/128/256 px; `SOLIDCRAFT_ICONS` override retained |
+| Linux, Nix, deb/rpm, tar, Flatpak, Snap | Copy canonical hicolor images; icon name stays `ai.storyteller.solidcraft` |
+| AppImage | Uses the Linux 256 px image and `.DirIcon` alias |
+| FreeBSD | Shares Linux hicolor images and freedesktop metadata |
+| Web | HTML/Trunk and `manifest.webmanifest` stay in `apps/solidcraft-web/`; copies Japanese font/licence to `fonts/`, uses the collected CSS, and copies the Linux 32/256/512 px images to `icons/` for the favicon and installed app |
+| Docs and link previews | `xtask book` copies the shared card to the existing `/solidcraft/og.png` public path |
+
+## Code and provenance
+
+Resources remain compiled by their owning layer through existing APIs:
+`ui-egui::icons::paint` and `Tokens` at L5, model presets in L2 `doc`, and sketch
+fonts at L1. State, projection, interaction, commands and GPU bindings stay in
+their current modules. Embedded data uses `CARGO_MANIFEST_DIR`; application code
+needs no runtime resource registry or repository lookup.
+
+`cargo xtask assets` requires an exact attribution row for every collected file
+except Markdown documentation, and continues checking file assets elsewhere in
+the repository. This includes native work, Rust masters, catalogs, shaders and
+platform templates. Packaging selects explicit current files and fails when
+required inputs are absent. Archived artwork has no production consumers.
+
+Dependency-owned egui fonts and vendored renderer shaders stay with their
+libraries; their licences remain in `THIRD-PARTY-LICENSES.txt` and `ATTRIBUTION.md`.
+System fonts, optional packs, user fonts/canvases/decals/materials and native OS
+controls retain external ownership. Root licence/notice texts stay canonical.

assets/appearances/library.rs

@@ -0,0 +1,23 @@
+//! Built-in model appearances: names, sRGB colours and metalness.
+pub const LIBRARY: [(&str, [u8; 3], f64); 20] = [
+    ("Aluminum - Satin", [204, 208, 214], 1.0),
+    ("Aluminum - Anodized Black", [44, 46, 50], 1.0),
+    ("Aluminum - Anodized Blue", [52, 92, 160], 1.0),
+    ("Steel - Satin", [158, 164, 172], 1.0),
+    ("Stainless Steel - Brushed", [186, 191, 198], 1.0),
+    ("Cast Iron", [104, 104, 110], 1.0),
+    ("Brass - Polished", [208, 172, 88], 1.0),
+    ("Copper", [204, 122, 80], 1.0),
+    ("Titanium", [150, 148, 158], 1.0),
+    ("ABS - White", [236, 236, 230], 1.0),
+    ("ABS - Black", [36, 36, 38], 1.0),
+    ("ABS - Red", [196, 40, 40], 1.0),
+    ("ABS - Blue", [40, 90, 186], 1.0),
+    ("ABS - Yellow", [236, 196, 40], 1.0),
+    ("ABS - Green", [52, 150, 80], 1.0),
+    ("Rubber - Black", [28, 28, 28], 1.0),
+    ("Glass - Clear", [190, 220, 228], 0.25),
+    ("Glass - Smoked", [90, 96, 104], 0.45),
+    ("Wood - Oak", [190, 146, 92], 1.0),
+    ("Paint - Gloss White", [246, 246, 244], 1.0),
+];

assets/fonts/ibm-plex-mono/OFL.txt

@@ -0,0 +1,93 @@
+Copyright © 2017 IBM Corp. with Reserved Font Name "Plex"
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

assets/fonts/ibm-plex-sans/OFL.txt

@@ -0,0 +1,93 @@
+Copyright © 2017 IBM Corp. with Reserved Font Name "Plex"
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.