Release 0.7.0 (#508)

Bump the workspace to 0.7.0 and write the 0.7.0 release notes. Minor bump: the design format moved to 15 (sketches on cylinder caps and sheet metal panels), so 0.6 can't open 0.7 saves, and new features landed (Select Other, per-edge flanges, sketches on caps and sheet metal faces).

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

.cargo/config.toml

@@ -0,0 +1,2 @@
+[alias]
+xtask = "run --package xtask --"

.config/nextest.toml

@@ -0,0 +1,29 @@
+# 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).
+
+[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`.
+# 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(=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-ui-egui) & binary(scenarios) & test(=acceptance_sensor_enclosure))
+)
+"""
+fail-fast = false
+# Every test's time in the log, so the slow ones are easy to find.
+status-level = "pass"
+final-status-level = "slow"
+failure-output = "immediate-final"
+slow-timeout = { period = "60s" }
+
+[profile.ci.junit]
+path = "junit.xml"

.github/FUNDING.yml

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

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+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/pull_request_template.md

@@ -0,0 +1,17 @@
+## Change
+
+Describe the problem and resulting behavior. Link the issue when applicable.
+
+## Validation
+
+What did you run, and what were the results? Include expected and measured values for geometry changes.
+
+## 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.
+
+## Integration status
+
+Record the upstream commit and PR status checked before handoff, any conflicts resolved, and validation after integration. Keep up with upstream merges and monitor this PR while the task is active; rebase before pushing and never force-push.

.github/release-notes.md

@@ -0,0 +1,88 @@
+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/) ·
+[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)).
+
+**Why 0.7:** this is a minor bump because the design file format moved to version 15 (sketches
+on cylinder caps and sheet metal panels need new references), and because it adds new features.
+
+**What's new**
+- **Sketching on stacked extrudes works again.** Creating a sketch on the top face of an extrude
+  stacked on another failed with "operation failed" since 0.3
+  ([#489](https://github.com/bherbruck/solidcraft/issues/489)). It's fixed, and every flat face
+  of the test models is now checked for this on every change.
+- **Select Other:** hold or right-click to pick something hidden under something else; click
+  again to cycle through what's underneath.
+- **Tabs are named after their file** instead of "Untitled".
+- **Modelling:** a flange angle and height per edge, Patch fills non-planar loops, sketches on
+  cylinder caps and on sheet metal faces, and a feature rename updates everything that refers to
+  it.
+- **Fixes:** revolve with edges on the axis, shell and fillet with small rounds, Join keeps face
+  attachments, and STEP export writes each lump of a body as its own solid.
+- **Navigation and UI:** orbiting from empty space turns around the visible geometry, Ctrl+drag
+  orbits in every preset, toolbar drops land across labels and gaps, Combine previews before OK,
+  and sketch constraints accept the sketch's own x / y axes.
+- Opening a design reads its metadata and preview through a bounded, seekable reader; the docs
+  and web app have link preview cards.
+
+**File format.** Designs are now format 15 (`solidcraft/15`). SolidCraft 0.6 and older can't
+open designs saved by 0.7, as a container or as JSON; keep a copy of a file you may still open
+in 0.6. Files from every earlier version still open in 0.7.
+
+**Known limitations**
+- Some faces still need the fixed-plane fallback for sketches: side faces Join merged from two
+  extrudes ([#491](https://github.com/bherbruck/solidcraft/issues/491)), faces split by a later
+  feature ([#492](https://github.com/bherbruck/solidcraft/issues/492)), Cut walls and chamfer
+  faces ([#493](https://github.com/bherbruck/solidcraft/issues/493)), faces after Revolve,
+  Offset Face or Boss ([#494](https://github.com/bherbruck/solidcraft/issues/494)) and sheet
+  metal thickness faces ([#495](https://github.com/bherbruck/solidcraft/issues/495)).
+- Cutting a coaxial cylinder from a thin disc can lose a little volume
+  ([#500](https://github.com/bherbruck/solidcraft/issues/500)); an edge flange with different
+  per-edge angles leaves gaps at the corners
+  ([#501](https://github.com/bherbruck/solidcraft/issues/501)).
+- More in [ROADMAP.md](https://github.com/bherbruck/solidcraft/blob/main/ROADMAP.md#known-limitations).
+
+**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).
+
+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
+  `-portable.zip` (x64, x86 and arm64).
+- **macOS 11+** (Apple silicon and Intel): open the `.dmg` and drag `SolidCraft.app` onto Applications.
+  The CLI is in `solidcraft-cli-{version}-macos-universal.zip`.
+- **Linux** (x86_64 and aarch64, glibc 2.35+): the `.AppImage` (`chmod +x`, then run it), the
+  `.deb` or `.rpm`, the `.flatpak` (`flatpak install --user <file>`), the `.snap`
+  (`sudo snap install --dangerous <file>`, or `sudo snap install solidcraft` from the Snap Store), or the `.tar.gz`.
+- **FreeBSD:** `tar -xzf solidcraft-{version}-freebsd-x86_64.tar.gz --strip-components 1 -C /usr/local`.
+- **Web:** `solidcraft-web-{version}.zip` is a static site to host yourself.
+- `SHA256SUMS.txt`: `sha256sum -c SHA256SUMS.txt --ignore-missing`.
+- Files without a version in the name (`solidcraft-windows-x64.msi`, `solidcraft-linux-x86_64.AppImage`, …)
+  are the same packages under fixed names, for download links that always fetch the latest release.
+
+For Flatpak feed installation and updates, add Flathub for the required runtime before
+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
+```
+
+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).
+
+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`.
+

.github/workflows/ci.yml

@@ -0,0 +1,318 @@
+# 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.
+# Cross-compilation is opt-in through Run workflow; release builds remain in release.yml.
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  schedule:
+    - cron: "17 6 * * *"
+  workflow_dispatch:
+    inputs:
+      cross_compile:
+        description: "Also check WebAssembly and RISC-V (before a release)"
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  # Every push to main gets its full run; a new PR push replaces the old run.
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  changes:
+    name: Select checks
+    runs-on: ubuntu-24.04
+    outputs:
+      native: ${{ steps.paths.outputs.native }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+      - id: paths
+        name: Detect code and CI changes
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        run: |
+          native=false
+          if [ "$EVENT_NAME" != pull_request ]; then
+            native=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
+                .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 ;;
+              esac
+            done < "$RUNNER_TEMP/ci-paths"
+          fi
+          echo "native=$native" >> "$GITHUB_OUTPUT"
+
+  checks:
+    name: Format and repository checks
+    runs-on: ubuntu-24.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: repo-checks
+      - name: Format
+        run: cargo fmt --all -- --check
+      - name: Asset attribution
+        run: cargo xtask assets
+      - name: Licences
+        run: cargo xtask licences --check
+      - name: Dependency layers
+        run: cargo xtask layers
+
+  clippy:
+    name: Native Linux Clippy
+    needs: changes
+    if: needs.changes.outputs.native == 'true'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: native-clippy
+      - run: cargo clippy --workspace --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
+    env:
+      CARGO_INCREMENTAL: "0"
+      RUSTC_WRAPPER: sccache
+      SCCACHE_GHA_ENABLED: "true"
+      SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: native-tests
+      - name: Set up compiler cache
+        uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
+        with:
+          version: v0.16.0
+      - uses: taiki-e/install-action@1168f6810a3cb30a3514bf5756a3b7f0422c6df8 # v2.87.28
+        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
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: nextest-archive
+          path: tests.tar.zst
+          retention-days: 1
+          compression-level: 0
+      - name: Compiler cache statistics
+        if: always()
+        run: sccache --show-stats
+
+  tests:
+    name: Native Linux tests (${{ matrix.shard }}/4)
+    needs: build-tests
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        shard: [1, 2, 3, 4]
+    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 tests
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          SHARD: ${{ matrix.shard }}
+        run: |
+          # Pull requests skip the heavy tests (default-filter in .config/nextest.toml).
+          all=()
+          if [ "$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.
+          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
+        if: always()
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: junit-${{ matrix.shard }}
+          path: target/nextest/ci/junit.xml
+          retention-days: 7
+
+  doc-tests:
+    name: Doc tests
+    needs: changes
+    if: needs.changes.outputs.native == 'true'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 45
+    env:
+      CARGO_INCREMENTAL: "0"
+      RUSTC_WRAPPER: sccache
+      SCCACHE_GHA_ENABLED: "true"
+      SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: doc-tests
+      - 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
+
+  oracle:
+    name: Reference tests
+    needs: changes
+    if: needs.changes.outputs.native == 'true'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    env:
+      CARGO_INCREMENTAL: "0"
+      RUSTC_WRAPPER: sccache
+      SCCACHE_GHA_ENABLED: "true"
+      SCCACHE_IGNORE_SERVER_IO_ERROR: "1"
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: oracle
+      - name: Set up compiler cache
+        uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
+        with:
+          version: v0.16.0
+      - 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
+      - name: Upload the report
+        if: always()
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: oracle-report
+          path: docs/oracle.md
+
+  # 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
+    steps:
+      - name: Verify required checks
+        env:
+          CHANGES: ${{ needs.changes.result }}
+          CHECKS: ${{ needs.checks.result }}
+          NATIVE: ${{ needs.changes.outputs.native }}
+          CLIPPY: ${{ needs.clippy.result }}
+          BUILD: ${{ needs.build-tests.result }}
+          TESTS: ${{ needs.tests.result }}
+          DOCS: ${{ needs.doc-tests.result }}
+          ORACLE: ${{ needs.oracle.result }}
+        run: |
+          test "$CHANGES" = success
+          test "$CHECKS" = success
+          if [ "$NATIVE" = true ]; then
+            test "$CLIPPY" = success
+            test "$BUILD" = success
+            test "$TESTS" = success
+            test "$DOCS" = success
+            test "$ORACLE" = success
+          fi
+
+  wasm:
+    name: Compile WebAssembly (manual)
+    if: github.event_name == 'workflow_dispatch' && inputs.cross_compile
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    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: wasm
+      - 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
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Check out craft-fonts
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          repository: storytold/craft-fonts
+          ref: ${{ env.CRAFT_FONTS_REF }}
+          path: craft-fonts
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: riscv64gc-unknown-linux-gnu
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: riscv64
+      - name: Install cross-compilation dependencies
+        run: |
+          # Ubuntu's regular archive serves amd64; RISC-V packages live in ports.
+          # The 24.04 runner uses deb822 sources, so scope every Ubuntu stanza.
+          sudo sed -i '/^Architectures:/d; /^Types:/a Architectures: amd64' /etc/apt/sources.list.d/ubuntu.sources
+          sudo tee /etc/apt/sources.list.d/riscv64.sources >/dev/null <<'EOF'
+          Types: deb
+          URIs: http://ports.ubuntu.com/ubuntu-ports
+          Suites: noble noble-updates noble-backports noble-security
+          Components: main restricted universe multiverse
+          Architectures: riscv64
+          Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+          EOF
+          sudo dpkg --add-architecture riscv64
+          sudo apt-get update
+          sudo apt-get install -y gcc-riscv64-linux-gnu libasound2-dev:riscv64 libxkbcommon-dev:riscv64 \
+            libwayland-dev:riscv64 libx11-dev:riscv64 libxrandr-dev:riscv64 libxi-dev:riscv64 libgl1-mesa-dev:riscv64
+      - name: Cargo check on RISC-V
+        env:
+          CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER: riscv64-linux-gnu-gcc
+          PKG_CONFIG_SYSROOT_DIR: /
+          PKG_CONFIG_PATH: /usr/lib/riscv64-linux-gnu/pkgconfig:/usr/share/pkgconfig
+          PKG_CONFIG_ALLOW_CROSS: 1
+        run: |
+          . "$HOME/.cargo/env"
+          export CRAFT_FONTS_DIR="$PWD/craft-fonts"
+          cargo check --all-targets --locked --target riscv64gc-unknown-linux-gnu

.github/workflows/flatpak-pages.yml

@@ -0,0 +1,37 @@
+name: Publish Flatpak repository to Pages
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      release_tag:
+        description: "Published GitHub release tag to publish (for example, v1.2.3)"
+        required: true
+        type: string
+
+permissions:
+  contents: read
+  actions: write
+
+concurrency:
+  group: flatpak-pages-${{ github.repository }}
+  cancel-in-progress: false
+
+jobs:
+  publish:
+    name: Request the combined docs, web, and Flatpak deployment
+    runs-on: ubuntu-24.04
+    env:
+      GH_TOKEN: ${{ github.token }}
+      RELEASE_TAG: ${{ github.event.release.tag_name || inputs.release_tag }}
+    steps:
+      - name: Deploy through the shared Pages workflow
+        run: |
+          set -euo pipefail
+          published="$(gh api "repos/$GITHUB_REPOSITORY/releases/tags/$RELEASE_TAG" \
+            --jq 'select(.draft == false and .published_at != null) | .tag_name')"
+          test "$published" = "$RELEASE_TAG"
+          gh workflow run pages.yml --repo "$GITHUB_REPOSITORY" --ref main \
+            -f release_tag="$RELEASE_TAG"
+          echo "Requested the combined Pages deployment for $RELEASE_TAG" >>"$GITHUB_STEP_SUMMARY"

.github/workflows/freecad-oracle.yml

@@ -0,0 +1,47 @@
+# Optional, run by hand: rebuild the reference cases whose expected values come from FreeCAD
+# (tools/freecad-oracle/) and show what changed. FreeCAD runs as a separate program on the runner;
+# it is not a dependency of SolidCraft. Nothing is committed: review the diff and the uploaded
+# files, then commit them in a pull request if the change is intended.
+name: FreeCAD reference values
+
+on:
+  workflow_dispatch:
+    inputs:
+      cases:
+        description: "Case directories (space separated); empty = every case whose source is FreeCAD"
+        type: string
+        default: ""
+
+permissions:
+  contents: read
+
+jobs:
+  regenerate:
+    name: Regenerate FreeCAD expected values
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Install FreeCAD
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends freecad
+          freecadcmd --version || true
+      - name: Rebuild the cases
+        env:
+          CASES: ${{ inputs.cases }}
+        run: |
+          if [ -z "$CASES" ]; then
+            CASES=$(grep -l '"source": *"freecad' tests/oracle/*/expected.json | xargs -n1 dirname | tr '\n' ' ')
+          fi
+          # shellcheck disable=SC2086
+          tools/freecad-oracle/run.sh --write $CASES
+      - name: Show the changes
+        run: git diff --stat && git diff -- tests/oracle/*/expected.json
+      - name: Upload the regenerated files
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: freecad-expected
+          path: |
+            tests/oracle/*/expected.json
+            tests/oracle/*/reference.stl

.github/workflows/packaging-lint.yml

@@ -0,0 +1,61 @@
+# Quick static checks for the release pipeline (seconds, no Rust build): workflow syntax, the
+# packaging shell and PowerShell scripts, and the Linux desktop/AppStream/Flatpak metadata.
+# Adapted from PhotoCraft's (storytold/photocraft, Apache-2.0; see ATTRIBUTION.md).
+name: Packaging lint
+
+on:
+  push:
+    branches: [main]
+    paths: [".github/workflows/**", "packaging/**"]
+  pull_request:
+    paths: [".github/workflows/**", "packaging/**"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: packaging-lint-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      ACTIONLINT_VERSION: 1.7.12
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Install tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends shellcheck desktop-file-utils appstream libxml2-utils python3-yaml jq
+          curl -fsSL "https://github.com/rhysd/actionlint/releases/download/v${ACTIONLINT_VERSION}/actionlint_${ACTIONLINT_VERSION}_linux_amd64.tar.gz" \
+            | tar -xz -C "$RUNNER_TEMP" actionlint
+      - name: actionlint
+        run: '"$RUNNER_TEMP/actionlint" -color'
+      - name: shellcheck
+        run: shellcheck packaging/*.sh packaging/*/*.sh packaging/linux/AppRun
+      - name: Nightly release selection regression
+        run: python3 packaging/tests/nightly_test.py
+      - name: Windows executable icon validation regression
+        run: python3 packaging/tests/windows_icon_test.py
+      - name: Flatpak desktop smoke validation regression
+        run: python3 packaging/tests/flatpak_test.py
+      - name: PowerShell
+        shell: pwsh
+        run: |
+          foreach ($f in Get-ChildItem packaging/windows/*.ps1) {
+            $errors = $null
+            [System.Management.Automation.Language.Parser]::ParseFile($f.FullName, [ref]$null, [ref]$errors) | Out-Null
+            if ($errors) { $errors | ForEach-Object { Write-Output "::error file=$($f.Name)::$_" }; exit 1 }
+            Write-Output "ok $($f.Name)"
+          }
+      - 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'"
+          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

@@ -0,0 +1,82 @@
+# 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
+# repository is private.
+name: Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+    inputs:
+      release_tag:
+        description: "Published release for Flatpak (empty: latest stable release)"
+        type: string
+        required: false
+        default: ""
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+env:
+  CARGO_TERM_COLOR: always
+  MDBOOK_VERSION: v0.5.4
+  TRUNK_VERSION: v0.21.14
+
+jobs:
+  build:
+    if: ${{ !github.event.repository.private }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+      - name: Install mdbook and trunk
+        run: |
+          mkdir -p "$HOME/.local/bin"
+          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: Build the book
+        run: cargo xtask book
+      - name: Build the web app
+        working-directory: apps/solidcraft-web
+        run: trunk build --release --public-url /solidcraft/app/
+      - name: Assemble the site
+        run: |
+          mkdir -p site
+          cp -r target/book/. site/
+          cp -r dist/web site/app
+      - uses: actions/configure-pages@v5
+        id: pages
+      - name: Install Flatpak repository tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends flatpak ostree
+      - name: Include the published Flatpak repository
+        env:
+          GH_TOKEN: ${{ github.token }}
+          RELEASE_TAG: ${{ inputs.release_tag || '' }}
+          PAGES_BASE_URL: ${{ steps.pages.outputs.base_url }}
+        run: bash packaging/flatpak-site.sh site
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/release.yml

@@ -0,0 +1,517 @@
+# Release pipeline, after PhotoCraft's (storytold/photocraft, Apache-2.0; see ATTRIBUTION.md).
+#
+# Push to `release` to build packages and create/update a DRAFT GitHub Release. The version
+# comes from [workspace.package] in Cargo.toml. An agent verifies the artifacts and publishes
+# the draft separately; see docs/releasing.md. Tags and pushes to main do not trigger releases.
+# At midnight Eastern, changed main commits build and publish a nightly pre-release.
+# A version with a suffix (0.2.0-rc.1) is a pre-release. Nothing is signed yet.
+#
+#   Linux x86_64, aarch64   AppImage (+ .zsync), .deb, .rpm, .flatpak, .snap, .tar.gz packaging/linux
+#   FreeBSD x86_64          .tar.gz (built in a FreeBSD VM)                        packaging/freebsd
+#   macOS universal         .dmg, and the CLI as a .zip                            packaging/macos
+#   Windows x64, x86, arm64 .msi and a portable .zip; x64 also the plain .exe      packaging/windows
+#   Web                     a .zip of the static site                              packaging/web
+#
+# The main installers are also attached without the version in their names
+# (solidcraft-windows-x64.msi, solidcraft-linux-x86_64.AppImage, ...) so that
+# releases/latest/download/<name> links in the README keep working across releases.
+#
+# A dry run: dispatch with draft=false (the default). Only the release branch may create drafts.
+name: Release
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+      timezone: America/New_York
+  push:
+    branches: [release]
+  workflow_dispatch:
+    inputs:
+      draft:
+        description: "Create/update a draft (release branch only; off: build artifacts only)"
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: 0
+
+jobs:
+  version:
+    runs-on: ubuntu-latest
+    outputs:
+      build: ${{ steps.changed.outputs.build }}
+      version: ${{ steps.v.outputs.version }}
+      date: ${{ steps.v.outputs.date }}
+      prerelease: ${{ steps.v.outputs.prerelease }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+      - id: changed
+        name: Skip unchanged nightly builds
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: bash packaging/nightly.sh
+      - id: v
+        if: steps.changed.outputs.build == 'true'
+        name: Resolve version
+        env:
+          REQUEST_DRAFT: ${{ inputs.draft || false }}
+        run: |
+          . packaging/env.sh
+          if [ "$GITHUB_EVENT_NAME" = schedule ]; then
+            # Unique SemVer without committing daily version bumps to main.
+            VERSION="${VERSION%%-*}-nightly.$(TZ=America/New_York date +%Y%m%d).$GITHUB_RUN_NUMBER.$GITHUB_RUN_ATTEMPT"
+          fi
+          if ! printf '%s' "$VERSION" | grep -Eq '^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[A-Za-z-][0-9A-Za-z-]*)(\.(0|[1-9][0-9]*|[0-9]*[A-Za-z-][0-9A-Za-z-]*))*))?$'; then
+            echo "::error::Cargo.toml must contain a version like 1.2.3 or 1.2.3-rc.1"
+            exit 1
+          fi
+          if [ "$REQUEST_DRAFT" = true ] && [ "$GITHUB_REF" != refs/heads/release ]; then
+            echo "::error::Draft releases must be built from the release branch"
+            exit 1
+          fi
+          case "$VERSION" in *-*) pre=true ;; *) pre=false ;; esac
+          { echo "version=$VERSION"; echo "date=$(date -u +%Y-%m-%d)"; echo "prerelease=$pre"; } >>"$GITHUB_OUTPUT"
+          echo "### SolidCraft v$VERSION (\`${GITHUB_SHA::9}\`)" >>"$GITHUB_STEP_SUMMARY"
+
+  # The app icon in every size, drawn by solidcraft-cli (no image files are committed), for the
+  # Windows jobs: the ARM64 build is cross-compiled and can't run there to draw its own.
+  icons:
+    needs: version
+    if: needs.version.outputs.build == 'true'
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: release-icons
+      - run: cargo build --release --locked -p solidcraft-cli
+      - run: |
+          . packaging/env.sh
+          make_icons target/release/solidcraft-cli icons
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: icons
+          path: icons
+          if-no-files-found: error
+
+  linux:
+    name: Linux ${{ matrix.arch }}
+    needs: version
+    if: needs.version.outputs.build == 'true'
+    # The oldest GitHub-hosted image, so the binaries only need glibc >= 2.35.
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { arch: x86_64, runner: ubuntu-22.04, deb: amd64 }
+          - { arch: aarch64, runner: ubuntu-22.04-arm, deb: arm64 }
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}
+      NFPM_VERSION: 2.47.0
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Install packaging tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends desktop-file-utils appstream zsync rpm
+          curl -fsSL -o "$RUNNER_TEMP/nfpm.deb" \
+            "https://github.com/goreleaser/nfpm/releases/download/v${NFPM_VERSION}/nfpm_${NFPM_VERSION}_${{ matrix.deb }}.deb"
+          sudo dpkg -i "$RUNNER_TEMP/nfpm.deb"
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: release-linux-${{ matrix.arch }}
+      - name: Build and package (AppImage, deb, rpm, tar.gz)
+        run: packaging/linux/package.sh
+      - name: Check the packages
+        run: |
+          dpkg-deb --info dist/release/*.deb
+          dpkg-deb --contents dist/release/*.deb | grep -E 'usr/bin/solidcraft$|usr/bin/solidcraft-cli$|metainfo|applications|THIRD-PARTY-LICENSES.txt'
+          # Compatibility shims (docs/compatibility.md): the old CLI name and the package rename.
+          dpkg-deb --contents dist/release/*.deb | grep -E 'usr/bin/solvecraft-cli$'
+          dpkg-deb --field dist/release/*.deb Replaces Conflicts Provides | grep -F solvecraft
+          rpm -qip dist/release/*.rpm
+          rpm -qlp dist/release/*.rpm | grep -E '/usr/bin/solidcraft$|THIRD-PARTY-LICENSES.txt'
+          tar -tzf dist/release/*.tar.gz | grep -E '/bin/solidcraft$|THIRD-PARTY-LICENSES.txt'
+          ldd target/release/solidcraft
+          for appimage in dist/release/*.AppImage; do
+            chmod +x "$appimage"
+            APPIMAGE_EXTRACT_AND_RUN=1 "$appimage" --version
+            "$appimage" --appimage-updateinformation | grep -F 'gh-releases-zsync|'
+            test -s "$appimage.zsync"
+          done
+          # Legacy AppImage update alias (docs/compatibility.md).
+          ls dist/release/solvecraft-*-linux-*.AppImage.zsync
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-linux-${{ matrix.arch }}
+          path: dist/release/*
+          if-no-files-found: error
+
+  flatpak:
+    name: Flatpak ${{ matrix.arch }}
+    needs: [version, linux]
+    if: needs.version.outputs.build == 'true'
+    # Repackages the Linux job's tarball (the same binaries as the AppImage/deb/rpm); no Rust
+    # build here. 24.04 for a newer flatpak-builder than 22.04 ships.
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { arch: x86_64, runner: ubuntu-24.04 }
+          - { arch: aarch64, runner: ubuntu-24.04-arm }
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: release-linux-${{ matrix.arch }}
+          path: dist/linux
+      - name: Install flatpak-builder
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends flatpak flatpak-builder librsvg2-common xvfb xauth weston dbus-x11
+          # Ubuntu 24.04's AppArmor blocks the unprivileged user namespaces bubblewrap needs.
+          sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
+      - name: Build the Flatpak bundle
+        run: packaging/linux/flatpak-bundle.sh "dist/linux/solidcraft-$SOLIDCRAFT_VERSION-linux-${{ matrix.arch }}.tar.gz"
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-flatpak-${{ matrix.arch }}
+          path: dist/release/*.flatpak
+          if-no-files-found: error
+
+
+
+  snap:
+    name: Snap ${{ matrix.arch }}
+    needs: [version, linux]
+    if: needs.version.outputs.build == 'true'
+    # Repackages the Linux job's tarball, like the Flatpak. On 24.04 because the core24 base is
+    # Ubuntu 24.04, which lets snapcraft build on the runner itself (--destructive-mode).
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { arch: x86_64, runner: ubuntu-24.04 }
+          - { arch: aarch64, runner: ubuntu-24.04-arm }
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: release-linux-${{ matrix.arch }}
+          path: dist/linux
+      - name: Install snapcraft and the smoke-test tools
+        run: |
+          sudo snap install snapcraft --classic
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends xvfb xauth weston dbus-x11
+      - name: Build the snap
+        run: |
+          sudo --preserve-env=SOLIDCRAFT_VERSION,SOLIDCRAFT_BUILD_DATE env "PATH=$PATH" \
+            packaging/linux/snap-pack.sh --destructive-mode "dist/linux/solidcraft-$SOLIDCRAFT_VERSION-linux-${{ matrix.arch }}.tar.gz"
+          sudo chown -R "$(id -u):$(id -g)" dist target
+      - name: Install it and start the app on headless X11 and Wayland
+        run: |
+          snap_file="dist/release/solidcraft-$SOLIDCRAFT_VERSION-linux-${{ matrix.arch }}.snap"
+          sudo snap install --dangerous "$snap_file"
+          snap info --verbose "$snap_file" | head -n 12
+          snap connections solidcraft
+          solidcraft.cli --version
+          # Snaps expect the login session's runtime directory, which runners don't create.
+          sudo install -d -m 700 -o "$(id -u)" -g "$(id -g)" "/run/user/$(id -u)"
+          python3 packaging/linux/snap-smoke.py --out snap-smoke
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: snap-smoke-${{ matrix.arch }}
+          path: snap-smoke/*.png
+          if-no-files-found: error
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-snap-${{ matrix.arch }}
+          path: dist/release/*.snap
+          if-no-files-found: error
+
+  freebsd:
+    name: FreeBSD x86_64
+    needs: version
+    if: needs.version.outputs.build == 'true'
+    # GitHub has no FreeBSD runners: build in a FreeBSD 14.3 VM.
+    runs-on: ubuntu-latest
+    timeout-minutes: 180
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Build and package in a FreeBSD VM (tar.gz)
+        # vmactions/freebsd-vm v1.5.9, pinned by commit (it runs our build).
+        uses: vmactions/freebsd-vm@c46abacb49f09938ca4e1702d15d836285d694cc
+        with:
+          release: "14.3"
+          usesh: true
+          cpu: 4
+          mem: 12288
+          # Passed into the VM by name; never templated into the script below.
+          envs: "SOLIDCRAFT_VERSION SOLIDCRAFT_BUILD_DATE"
+          prepare: |
+            pkg install -y bash git curl pkgconf libxkbcommon wayland libX11 libXcursor libXrandr libXi libxcb mesa-libs vulkan-loader
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain stable
+          run: |
+            set -e
+            . "$HOME/.cargo/env"
+            git config --global --add safe.directory "$PWD"
+            # Build outside the checkout so only dist/ is copied back out of the VM. 4 jobs: more
+            # runs the VM out of memory.
+            export CARGO_TARGET_DIR=/var/tmp/solidcraft-target CARGO_BUILD_JOBS=4
+            bash packaging/freebsd/package.sh
+            tar -tzf dist/release/solidcraft-*-freebsd-x86_64.tar.gz \
+              | grep -E '/bin/solidcraft$|/bin/solidcraft-cli$|/share/applications/ai\.storyteller\.solvecraft\.desktop$|/share/doc/solidcraft/THIRD-PARTY-LICENSES\.txt$'
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-freebsd-x86_64
+          path: dist/release/*
+          if-no-files-found: error
+
+  macos:
+    name: macOS universal
+    needs: version
+    if: needs.version.outputs.build == 'true'
+    runs-on: macos-14
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: aarch64-apple-darwin, x86_64-apple-darwin
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: release-macos-universal
+      - name: Build and package (dmg, CLI zip; the dmg is mounted and checked)
+        run: packaging/macos/package.sh --arch universal
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-macos
+          path: dist/release/*
+          if-no-files-found: error
+
+  windows:
+    name: Windows ${{ matrix.arch }}
+    needs: [version, icons]
+    if: needs.version.outputs.build == 'true'
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { arch: x64, target: x86_64-pc-windows-msvc }
+          - { arch: x86, target: i686-pc-windows-msvc }
+          # Windows on ARM: cross-compiled on the x64 runner.
+          - { arch: arm64, target: aarch64-pc-windows-msvc }
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: icons
+          path: icons
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: release-windows-${{ matrix.arch }}
+      - name: Install WiX
+        shell: pwsh
+        run: |
+          dotnet tool install --global wix --version 5.0.2
+          wix extension add -g WixToolset.UI.wixext/5.0.2 WixToolset.Util.wixext/5.0.2
+      - name: Build and package (msi, portable zip)
+        shell: pwsh
+        env:
+          SOLIDCRAFT_ICONS: ${{ github.workspace }}/icons
+        run: ./packaging/windows/package.ps1 -Arch ${{ matrix.arch }}
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-windows-${{ matrix.arch }}
+          path: dist/release/*
+          if-no-files-found: error
+
+  web:
+    name: Web (wasm)
+    needs: version
+    if: needs.version.outputs.build == 'true'
+    runs-on: ubuntu-latest
+    env:
+      SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
+      TRUNK_VERSION: 0.21.14
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          key: release-web
+      - name: Install trunk
+        run: |
+          curl -fsSL "https://github.com/trunk-rs/trunk/releases/download/v${TRUNK_VERSION}/trunk-x86_64-unknown-linux-gnu.tar.gz" \
+            | tar -xz -C "$HOME/.cargo/bin" trunk
+      - name: Build and zip
+        run: packaging/web/package.sh
+      - uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-web
+          path: dist/release/*
+          if-no-files-found: error
+
+  release:
+    name: GitHub Release or dry-run artifacts
+    needs: [version, linux, flatpak, snap, freebsd, macos, windows, web]
+    if: needs.version.outputs.build == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      VERSION: ${{ needs.version.outputs.version }}
+      PRERELEASE: ${{ needs.version.outputs.prerelease }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      GH_REPO: ${{ github.repository }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          pattern: release-*
+          path: artifacts
+          merge-multiple: true
+      - name: Version-less copies for permanent download links
+        # The README links to releases/latest/download/<name>, which must not change between
+        # releases: solidcraft-<version>-windows-x64.msi is also uploaded as
+        # solidcraft-windows-x64.msi, and so on for the main installers.
+        working-directory: artifacts
+        run: |
+          shopt -s nullglob
+          for f in "solidcraft-$VERSION-"*; do
+            case "$f" in
+              *.msi | *-portable.zip | *.dmg | *.AppImage | *.deb | *.rpm | *.flatpak | *.snap)
+                cp -- "$f" "solidcraft-${f#"solidcraft-$VERSION-"}" ;;
+            esac
+          done
+          for f in solidcraft-windows-x64.msi solidcraft-macos-universal.dmg \
+            solidcraft-linux-x86_64.AppImage solidcraft-linux-x86_64.deb solidcraft-linux-x86_64.rpm; do
+            test -s "$f" || { echo "::error::missing version-less copy $f"; exit 1; }
+          done
+          ls -l solidcraft-[!0-9]*
+      - name: Checksums and notes
+        run: |
+          (cd artifacts && sha256sum -- * | tee SHA256SUMS.txt)
+          sed "s/{version}/$VERSION/g" .github/release-notes.md >notes.md
+      - name: Publish nightly pre-release
+        if: github.event_name == 'schedule'
+        working-directory: artifacts
+        run: |
+          tag="v$VERSION"
+          sha256sum --check SHA256SUMS.txt
+          # Stage all packages before publishing. Published tags are never replaced.
+          gh release create "$tag" --draft --prerelease --latest=false \
+            --title "SolidCraft v$VERSION (nightly)" --target "$GITHUB_SHA" \
+            --notes-file ../notes.md --generate-notes -- *
+          gh release edit "$tag" --draft=false --prerelease --latest=false
+          echo "### Published nightly: $tag (\`${GITHUB_SHA::9}\`)" >>"$GITHUB_STEP_SUMMARY"
+      - name: Create or update the draft release
+        if: github.ref == 'refs/heads/release' && (github.event_name == 'push' || inputs.draft)
+        working-directory: artifacts
+        run: |
+          tag="v$VERSION"
+          # Refuse existing tags: a draft must point at this build, never an older tag.
+          # matching-refs returns [] for an absent tag and fails on API/auth errors.
+          existing_refs="$(gh api "repos/$GH_REPO/git/matching-refs/tags/$tag" \
+            --jq '.[].ref')"
+          if printf '%s\n' "$existing_refs" | grep -Fxq "refs/tags/$tag"; then
+            echo "::error::Tag $tag already exists. Choose a new version; never move a release tag."
+            exit 1
+          fi
+          pre=()
+          if [ "$PRERELEASE" = true ]; then pre=(--prerelease); fi
+          if draft="$(gh release view "$tag" --json isDraft --jq .isDraft 2>/dev/null)"; then
+            if [ "$draft" != true ]; then
+              echo "::error::Release $tag is already published. Bump the version before releasing."
+              exit 1
+            fi
+            # Replace the complete draft asset set, including assets removed in this build.
+            assets="$(gh release view "$tag" --json assets --jq '.assets[].name')"
+            while IFS= read -r asset; do
+              if [ -n "$asset" ]; then gh release delete-asset "$tag" "$asset" --yes; fi
+            done <<<"$assets"
+            gh release edit "$tag" --draft --title "SolidCraft v$VERSION" \
+              --target "$GITHUB_SHA" --prerelease="$PRERELEASE"
+            gh release upload "$tag" --clobber -- *
+          else
+            gh release create "$tag" --draft --title "SolidCraft v$VERSION" \
+              --target "$GITHUB_SHA" --notes-file ../notes.md --generate-notes "${pre[@]}" -- *
+          fi
+          {
+            echo "Draft **SolidCraft v$VERSION** at \`${GITHUB_SHA::9}\`:"
+            echo
+            sed 's/^/    /' SHA256SUMS.txt
+          } >>"$GITHUB_STEP_SUMMARY"
+      # Snap Store: nightlies go to the edge channel and release drafts to candidate, only after
+      # every package built and the GitHub release was staged. Publishing the GitHub release
+      # promotes candidate to stable (snap-store.yml). Dry runs never upload. Skipped until the
+      # owner adds the SNAPCRAFT_STORE_CREDENTIALS secret (docs/releasing.md).
+      - id: snapstore
+        name: Check for Snap Store credentials
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        run: |
+          if [ -n "$SNAPCRAFT_STORE_CREDENTIALS" ]; then
+            echo "configured=true" >>"$GITHUB_OUTPUT"
+          else
+            echo "No SNAPCRAFT_STORE_CREDENTIALS secret: skipping the Snap Store upload."
+          fi
+      - name: Upload the snaps to the Snap Store
+        if: >-
+          steps.snapstore.outputs.configured == 'true' && (github.event_name == 'schedule' ||
+          (github.ref == 'refs/heads/release' && (github.event_name == 'push' || inputs.draft)))
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        working-directory: artifacts
+        run: |
+          sudo snap install snapcraft --classic
+          channel=candidate
+          if [ "$GITHUB_EVENT_NAME" = schedule ]; then channel=edge; fi
+          for arch in x86_64 aarch64; do
+            snapcraft upload --release="$channel" "solidcraft-$VERSION-linux-$arch.snap"
+          done
+          echo "Uploaded the snaps to the Snap Store's $channel channel." >>"$GITHUB_STEP_SUMMARY"
+      - name: Keep the files (dry run)
+        if: github.event_name == 'workflow_dispatch' && !inputs.draft
+        run: cp notes.md artifacts/release-notes.md
+      - if: github.event_name == 'workflow_dispatch' && !inputs.draft
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: release-assets
+          path: artifacts/*

.github/workflows/snap-store.yml

@@ -0,0 +1,40 @@
+# Publishing a GitHub release (not a prerelease) promotes the snaps that release.yml uploaded to
+# the Snap Store's candidate channel to stable, so `sudo snap install solidcraft` gets it.
+# Skipped until the owner adds the SNAPCRAFT_STORE_CREDENTIALS secret; see docs/releasing.md.
+name: Snap Store
+
+on:
+  release:
+    types: [released]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: snap-store
+  cancel-in-progress: false
+
+jobs:
+  promote:
+    runs-on: ubuntu-latest
+    steps:
+      - id: creds
+        name: Check for Snap Store credentials
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        run: |
+          if [ -n "$SNAPCRAFT_STORE_CREDENTIALS" ]; then
+            echo "configured=true" >>"$GITHUB_OUTPUT"
+          else
+            echo "No SNAPCRAFT_STORE_CREDENTIALS secret: nothing to promote."
+          fi
+      - name: Promote candidate to stable
+        if: steps.creds.outputs.configured == 'true'
+        env:
+          SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_STORE_CREDENTIALS }}
+        run: |
+          sudo snap install snapcraft --classic
+          snapcraft status solidcraft
+          snapcraft promote solidcraft --from-channel=latest/candidate --to-channel=latest/stable --yes
+          snapcraft status solidcraft

.gitignore

@@ -0,0 +1,9 @@
+/target*/
+/plan/
+/dist/
+*~
+.DS_Store
+*.swp
+/.claude/worktrees/
+/target-snapshot
+__pycache__/

AGENTS.md

@@ -0,0 +1,141 @@
+# SolidCraft — instructions for agents
+
+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`).
+
+## Showing and following through on changes
+
+- Help reviewers see what is broken or changed. For observable CAD, UI or model behavior,
+  issues and PRs must include actual descriptive screenshots or a short recording from a
+  small reproduction. This includes kernel, geometry, assembly and backend changes whose
+  effects can be shown in the app. Coding agents should run the app and capture this evidence
+  themselves; do not ask a human for evidence the agent can produce. Show the actual failure
+  or result, preferably before and after, with brief reproduction steps, expected/actual
+  behavior and annotations that point out the relevant detail.
+- Flowcharts and Mermaid diagrams cannot substitute for screenshots or recordings of visible
+  behavior. Use diagrams for architectural reasoning when actual screenshots cannot illustrate
+  the point. Changes with no useful observable behavior do not need screenshot or video evidence.
+- 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.
+
+## 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.

ATTRIBUTION.md

@@ -0,0 +1,109 @@
+# Attribution
+
+Every non-code asset in this repository (images, icons, fonts, example parts) is listed here with
+its author, source and licence. `cargo xtask assets` (part of `cargo xtask ci`) fails if an asset
+file is missing from this table.
+
+**Policy (mandatory):** SolidCraft contains **no Autodesk iconography, images, artwork, fonts,
+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`).
+
+## 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 |
+| docs/screenshots/sample-plate.png | SolidCraft contributors | screenshot of SolidCraft itself (`solidcraft --sample`) | MIT OR Apache-2.0 |
+| docs/screenshots/demo-0.6.gif | SolidCraft contributors | original screen recording of the actual SolidCraft 0.6 English desktop UI modelling an original Raspberry Pi 4 case (no logos or branding), generated with examples/demo/record_ui.sh and its original animated pointer overlay (6× playback) | MIT OR Apache-2.0 |
+| docs/screenshots/demo-0.6.mp4 | SolidCraft contributors | original screen recording of the actual SolidCraft 0.6 English desktop UI modelling an original Raspberry Pi 4 case (no logos or branding), generated with examples/demo/record_ui.sh and its original animated pointer overlay (6× playback) | MIT OR Apache-2.0 |
+| docs/book/src/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 |
+| 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 |
+| tests/oracle/30-fillet-after-shell/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/30-fillet-after-shell/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/31-fillet-l-all-edges/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/31-fillet-l-all-edges/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/34-chamfer-then-fillet/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/34-chamfer-then-fillet/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/35-fillet-curved-curved/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/35-fillet-curved-curved/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/36-corner-blend-two-radii/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/36-corner-blend-two-radii/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/37-pyramid-apex-blend/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/37-pyramid-apex-blend/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/39-tee-pipe/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/39-tee-pipe/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/41-tube-radial-holes/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/41-tube-radial-holes/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/42-overlapping-patterns/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/42-overlapping-patterns/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/47-draft-curved-pocket/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/47-draft-curved-pocket/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/51-loft-rect-circle-offset/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/51-loft-rect-circle-offset/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/56-holes-on-curved-face/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/56-holes-on-curved-face/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/58-phone-stand/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/58-phone-stand/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/59-enclosure-base/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/59-enclosure-base/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| tests/oracle/61-shaft-keyway/reference.stl | SolidCraft contributors | triangulation of our own recipe (tests/oracle/61-shaft-keyway/recipe.json) built with FreeCAD as an external tool by tools/freecad-oracle | MIT OR Apache-2.0 |
+| 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 |
+
+## Code adapted from sibling projects
+
+| SolidCraft file | Adapted from | Licence |
+|---|---|---|
+| xtask/src/layers.rs | CADCraft `xtask/src/layers.rs` (dependency layering rules and tests) | MIT OR Apache-2.0 |
+| apps/solidcraft/src/control_server.rs | CADCraft `apps/cadcraft/src/control_server.rs` (loopback JSON-lines server) | MIT OR Apache-2.0 |
+| crates/ui-egui/src/lib.rs (screenshot queue, synthetic input) | CADCraft `crates/ui-egui/src/lib.rs` | MIT OR Apache-2.0 |
+| crates/ui-egui/src/control.rs (method dispatch and screenshot saving) | CADCraft `crates/ui-egui/src/control.rs` | MIT OR Apache-2.0 |
+| crates/ui-egui/src/gpu.rs (paint-callback structure) | CADCraft `crates/ui-egui/src/gpu.rs` | MIT OR Apache-2.0 |
+| crates/mcp/src/server.rs, crates/mcp/src/backend.rs (JSON-RPC framing, MCP lifecycle, control-port bridge) | CADCraft `crates/mcp/src/{server,backend}.rs` | MIT OR Apache-2.0 |
+| 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 |
+| 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 |
+
+## Recovered contributions
+
+| SolidCraft file | Original contribution | Licence |
+|---|---|---|
+| crates/ui-egui/src/viewport.rs (`nearest_quarter_turn`, `axis_view_orbit`) | N3MI-DG's [PR #101](https://github.com/bherbruck/solidcraft/pull/101): [minimal TOP/BOTTOM turns](https://github.com/bherbruck/solidcraft/commit/c28e780f52490784ef5886f094b9d3f6d10c3e3f) and [drag-to-orbit](https://github.com/bherbruck/solidcraft/commit/f30b30be6ecc4e2e6544a851243137c01a354934), adapted to the axis gizmo | MIT OR Apache-2.0 |
+
+## Vendored third-party code
+
+| 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-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/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
+
+`vendor/egui-wgpu` is egui-wgpu 0.36.2 from https://github.com/emilk/egui
+(MIT OR Apache-2.0; both original licence texts are included). Rust sources and
+its original `egui.wgsl` shader are retained; no images or other artwork are copied.
+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.

CLAUDE.md

@@ -0,0 +1,118 @@
+# SolidCraft — instructions for agents
+
+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.

CONTRIBUTING.md

@@ -0,0 +1,240 @@
+# Contributing to SolidCraft
+
+SolidCraft is an open-source parametric 3D CAD app written in pure Rust.
+You sketch on a plane, constrain the sketch, turn profiles into solids, and
+change a parameter to watch the timeline rebuild. It runs as a desktop app (Windows, Linux), in
+the browser (wasm + WebGPU/WebGL2), headless from a CLI, and as an MCP server that AI agents can
+model with.
+
+Help is welcome, whether that's a one-line fix or owning a whole area. This page covers how to
+build it, how the code is laid out, the few rules that aren't negotiable, and where help is
+needed most.
+
+## 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).
+
+```sh
+git clone https://github.com/bherbruck/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)
+```
+
+SolidCraft is the product, repository, Cargo package and executable name.
+Build the desktop app with `cargo build --release -p solidcraft`, or the CLI with
+`cargo build --release -p solidcraft-cli`. Run the CLI with
+`cargo run --release -p solidcraft-cli -- commands` (or `target/release/solidcraft-cli commands`
+after building). The old name appears only in the compatibility shims listed in
+[docs/compatibility.md](docs/compatibility.md); don't add new uses of it.
+
+Web: `cd apps/solidcraft-web && trunk serve --release`, then open the printed URL (`?sample`
+opens the sample part, `?webgl` forces WebGL2). Saving and opening files in the browser needs
+HTTPS or localhost, because it uses the Origin Private File System.
+
+Windows from Linux: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solidcraft`.
+
+### NixOS: `nix develop`
+
+NixOS has no `/usr/lib`, so nothing is on `LD_LIBRARY_PATH` and a plain `cargo run` finds none of
+the libraries the app loads at run time: the Wayland ones winit opens the window through, the EGL
+loader wgpu renders through, and libdbus-1, which rfd's file dialogs reach xdg-desktop-portal
+through (a dialog then never appears and the pick returns no path):
+
+```
+ERROR solidcraft: winit EventLoopError: ... The wayland library could not be loaded
+ERROR eframe::native::run: Exiting because of error: WGPU error: Failed to create surface for any enabled backend: {}
+ERROR rfd::backend::xdg_desktop_portal::portal::libdbus: Can't connect to a portal: libdbus-1.so not found
+```
+
+`nix develop` (the [`flake.nix`](flake.nix) in the repository root) supplies Wayland,
+X11, EGL, Vulkan-loader and D-Bus runtime libraries. It also exposes the NixOS
+driver manifests in `/run/opengl-driver/share`, so Vulkan can discover the system
+drivers. Enable `hardware.graphics.enable` on NixOS; other Linux distributions
+may need a matching [nixGL wrapper](https://github.com/nix-community/nixGL).
+The default development shell retains the Rust/C toolchain already on `PATH`;
+`nix develop .#rust` supplies the pinned toolchain and builds in `target/nix`.
+
+To launch, use `nix run .#solidcraft -- --sample`. To install the app's terminal
+commands, desktop entry and generated icons, use `nix profile install .#solidcraft`.
+`nix build` alone creates a build result; it does not install a launcher in your
+desktop menu. The installed `solidcraft` command runs the wrapped app; `solidcraft-cli` is included as
+well. See
+[Nix installation and troubleshooting](docs/nix.md) for remote-flake commands,
+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:
+
+- `crates/geom`: vectors, planes, meshes, measures.
+- `crates/sketch`: our own constraint solver, plus profile finding.
+- `crates/kernel`: the B-rep kernel boundary. It wraps [truck](https://github.com/ricosjp/truck),
+  and it's the only crate allowed to touch truck. Fillets, chamfers, shell/offset, Delete Face,
+  Split Face, STEP/IGES read and write, and face provenance are our own code here. Patched
+  copies of three truck crates live in `vendor/` and are excluded from our fmt/clippy rules.
+- `crates/doc`: the document. It holds parameters and expressions, the feature timeline and its
+  incremental rebuild, components and occurrences, joints, appearances, and persistent naming.
+- `crates/io`: design files and mesh formats (3MF, STL, OBJ).
+- `crates/engine`: the session and the command registry. **Everything the user can do is a
+  command**, and the toolbar, dialogs, scripts, CLI, control channel and MCP all run the same
+  commands.
+- `crates/ui-egui`: the desktop/web front end (egui + wgpu). It's swappable; nothing below it
+  depends on egui.
+- `crates/mcp`, `apps/solidcraft`, `apps/solidcraft-cli`, `apps/solidcraft-web`.
+
+`cargo xtask layers` fails the build if a lower layer depends on a higher one.
+
+## Rules that aren't negotiable
+
+1. **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. We don't drive, script, automate or extract data from commercial CAD
+   products, and we never copy another product's code, icons, artwork, help text, tooltips,
+   templates or materials. Command ids are our own (`solid.fillet`).
+2. **No GPL/LGPL/AGPL code, not even reading it.** That rules out OpenCASCADE, FreeCAD
+   (including planegcs), SolveSpace, CadQuery/OCP, LibreCAD and QCAD. SolidCraft is
+   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).
+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.
+   - 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).
+
+[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.
+
+## Tests
+
+| What | Where | Run |
+|---|---|---|
+| Unit and engine tests | next to the code, or `*_tests.rs` files | `cargo xtask test` (or `cargo test --workspace --profile ci`) |
+| UI scenarios | `crates/ui-egui/tests/scenarios/*.json` | part of `cargo test` |
+| Reference tests | `cargo xtask oracle` | `tests/oracle/` (see below) |
+
+**UI scenarios** drive the real app headless: start a tool, click a plane or a sketch point,
+press keys, then assert on the result.
+
+```json
+[
+  {"start": "sketch.create"},
+  {"click": {"plane": "XY"}},
+  {"start": "sketch.rectangle.two_point"},
+  {"click": {"sketch": [0, 0]}},
+  {"click": {"sketch": [40, 30]}},
+  {"expect": {"errors": 0}}
+]
+```
+
+A new `.json` file in that folder is picked up automatically. To record a bug before it's fixed,
+put `{"pending": "why"}` in the scenario, and remove it in the PR that fixes the bug.
+
+**A failing test without its fix can't merge as-is:** it would turn `main`'s CI red for everyone.
+Either include the fix in the same PR, or mark the test `#[ignore = "fails until #123 is fixed"]`
+(it can then merge right away), and remove that line in the PR that fixes the bug.
+
+**Use the `ci` profile.** CI runs the tests with `--profile ci`: light optimisation, line tables,
+no LTO, and debug assertions off (truck has debug-only assertions that reject valid geometry). It
+builds several times faster than `--release`. If a test fails only in a plain debug build, say so
+in the PR. `cargo xtask test` builds the tests with it and then runs every test binary at once
+(`cargo test` runs them one after another); arguments after `--` go to each binary, e.g.
+`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
+`.config/nextest.toml` and the [testing page](docs/book/src/dev/testing.md):
+
+- `solidcraft-engine`: `tests::hostile_params_never_panic`, everything in `tests::robustness`,
+  `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`
+- `solidcraft-ui-egui` scenarios: `acceptance_sensor_enclosure`
+
+**The reference tests** are 76 parts 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.
+
+## 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.
+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.
+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).
+
+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,
+geometry, assembly and backend work. Coding agents should run a small reproduction and
+capture the evidence themselves; please don't ask a human for evidence the agent can produce.
+Show the actual failure or result, preferably before and after, with brief steps and
+expected/actual behavior. An arrow or annotation can help identify the detail that matters.
+
+Flowcharts and Mermaid diagrams cannot replace evidence of visible behavior. Diagrams are
+useful for architectural reasoning when actual screenshots cannot illustrate the point.
+Changes with no useful observable behavior do not need screenshot or video evidence. Use a
+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.
+
+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.
+
+## 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.
+In order of how much they'd help users:
+
+1. **Fillet and blend robustness.** Fillets are our own code (truck has no fillet operation).
+   Constant, variable-radius and chord fillets work, and so do corners where fillets of
+   different radii meet, including three rounds meeting at a vertex. Next are setback corners, fillets along curved edges between curved
+   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
+   [ROADMAP.md](ROADMAP.md)), but anyone who wants to own one is welcome.
+
+## 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.

Cargo.toml

@@ -0,0 +1,107 @@
+[workspace]
+resolver = "3"
+members = ["crates/*", "apps/*", "xtask"]
+# Third-party code kept with local fixes (see vendor/README.md); not linted as ours.
+exclude = ["vendor"]
+
+[workspace.package]
+version = "0.7.0"
+edition = "2024"
+license = "MIT OR Apache-2.0"
+rust-version = "1.95"
+authors = ["SolidCraft contributors"]
+repository = "https://github.com/bherbruck/solidcraft"
+
+[workspace.dependencies]
+# internal
+solidcraft-geom = { path = "crates/geom" }
+solidcraft-sketch = { path = "crates/sketch" }
+solidcraft-kernel = { path = "crates/kernel" }
+solidcraft-render = { path = "crates/render" }
+solidcraft-doc = { path = "crates/doc" }
+solidcraft-io = { path = "crates/io" }
+solidcraft-engine = { path = "crates/engine" }
+solidcraft-ui-egui = { path = "crates/ui-egui" }
+solidcraft-mcp = { path = "crates/mcp" }
+
+# foundation
+thiserror = "2"
+serde = { version = "1", features = ["derive", "rc"] }
+serde_json = { version = "1", features = ["float_roundtrip"] }
+log = "0.4"
+sha2 = "0.10"
+
+# geometry kernel (Apache-2.0; see plan/adr/0001-geometry-kernel.md). Only crates/kernel uses it.
+truck-modeling = "0.6"
+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"
+
+# packages (3MF)
+zip = { version = "3", default-features = false, features = ["deflate"] }
+quick-xml = "0.38"
+
+# 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"] }
+
+# ui
+egui = "0.36"
+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"
+rfd = "0.17"
+
+[workspace.lints.rust]
+unsafe_code = "forbid"
+
+[workspace.lints.clippy]
+dbg_macro = "warn"
+todo = "warn"
+too_many_arguments = "allow"
+type_complexity = "allow"
+# `!(x > tol)` is our idiom for "not a usable number" (NaN-safe).
+neg_cmp_op_on_partial_ord = "allow"
+
+[profile.dev.package."*"]
+opt-level = 2
+
+[profile.dev]
+opt-level = 1
+
+# Tests and lints (`cargo xtask ci`, GitHub CI): quick to build, quick enough to run. Light
+# optimisation, line tables only (file:line in backtraces), no LTO. Debug assertions are off because
+# truck's debug-only checks reject valid geometry (seam edges, closed edges); that was the only
+# reason the tests used to build with --release, which cost most of CI's time.
+[profile.ci]
+inherits = "dev"
+opt-level = 1
+debug = "line-tables-only"
+debug-assertions = false
+overflow-checks = true
+incremental = false
+
+[profile.ci.package."*"]
+opt-level = 2
+
+[profile.release]
+opt-level = 3
+lto = "thin"
+codegen-units = 16
+# Line tables only: crash reports name file:line in their backtraces (no runtime cost; a larger
+# binary). See docs/crash-reports.md.
+debug = "line-tables-only"
+
+# truck-shapeops with SolidCraft fixes (Apache-2.0, see vendor/truck-shapeops and ATTRIBUTION.md).
+[patch.crates-io]
+truck-shapeops = { path = "vendor/truck-shapeops" }
+truck-stepio = { path = "vendor/truck-stepio" }
+truck-meshalgo = { path = "vendor/truck-meshalgo" }
+matext4cgmath = { path = "vendor/matext4cgmath" }
+
+# Keep OpenGL pipelines, resolve textures and CAD callbacks at the same safe sample count.
+egui-wgpu = { path = "vendor/egui-wgpu" }

LICENSE-APACHE

@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+
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+      and distribution as defined by Sections 1 through 9 of this document.
+
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+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+          Derivative Works a copy of this License; and
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+      the terms of any separate license agreement you may have executed
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
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+
+   END OF TERMS AND CONDITIONS

LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 SolidCraft contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

NOTICE

@@ -0,0 +1,28 @@
+SolidCraft
+Copyright (c) 2026 SolidCraft contributors.
+Licensed under the MIT License or the Apache License, Version 2.0, at your option
+(LICENSE-MIT, LICENSE-APACHE).
+
+Third-party material
+
+Software dependencies are listed in Cargo.lock; their licences are in THIRD-PARTY-LICENSES.txt
+(`cargo xtask licences`), which the programs also carry (Help > About > Licences,
+`solidcraft-cli licences`). The geometry kernel builds on the truck crates
+(truck-modeling, truck-shapeops, truck-meshalgo, truck-stepio, truck-topology and their
+dependencies, https://github.com/ricosjp/truck), licensed under the Apache License 2.0 and used
+as libraries. truck-shapeops 0.4.0 is vendored in vendor/truck-shapeops with SolidCraft
+modifications (listed in vendor/README.md and marked in the source); its licence is in
+vendor/truck-shapeops/LICENSE. Copyright (c) RICOS Co. Ltd.
+
+Some code is adapted from sibling projects in the storytold family (CADCraft, GridCraft), which are
+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.
+
+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.

README.md

@@ -0,0 +1,226 @@
+# SolidCraft
+
+**An open-source parametric 3D CAD application built in pure Rust.**
+
+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.
+
+![SolidCraft 0.6: model a Raspberry Pi 4 case from an empty design: a sketch dimensioned with parameters, extrude, fillets and shell, standoffs patterned on the board's mounting holes, port cut-outs, vent slots, a colour and a height change in Parameters](docs/screenshots/demo-0.6.gif)
+
+*A Raspberry Pi 4 case from an empty design: a sketch dimensioned with the board's parameters, extrude, fillet, shell, an M2.5 standoff patterned on the 58 × 49 mm hole rectangle, port cut-outs, vent slots and a colour, then height 24 → 32 mm in Parameters and it all rebuilds. 6× playback. [Full video](https://github.com/bherbruck/solidcraft/raw/refs/heads/main/docs/screenshots/demo-0.6.mp4), recorded with the [demo script](examples/demo/record_ui.sh).*
+
+## Download
+
+[![Download for Windows][badge-windows]][windows-msi]
+[![Download for macOS][badge-macos]][macos-dmg]
+[![Download for Linux][badge-linux]][linux-appimage]
+[![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].
+- **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**.
+
+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).
+
+[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
+[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. Points the constraints fix relative
+  to known geometry are placed exactly by construction (loci intersections and rigid-cluster
+  decomposition, after Owen 1991 and Fudos–Hoffmann 1997); Levenberg–Marquardt solves the rest,
+  and the rank of its Jacobian gives the remaining degrees of freedom. Constraints: coincident,
+  point on curve, horizontal/vertical, parallel, perpendicular, tangent, curvature (G2), equal,
+  concentric, collinear, midpoint, symmetry, fix; linear, aligned, horizontal, vertical,
+  point-to-line, radius, diameter, angle, arc sweep, arc length and slot length dimensions driven
+  by parameters. Over-constraining edits are rejected; fully constrained geometry turns black.
+  Dragging solves the sketch every frame and rebuilds the model once, when the drag ends.
+  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.

ROADMAP.md

@@ -0,0 +1,396 @@
+# SolidCraft roadmap
+
+Status as of **2026-10-11**. 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. |
+| 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. |
+| 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) |
+
+## Scope (owner decision, 2026-10-07)
+
+The issue batch adds preservation of blind pockets in through cuts, associative projected
+offsets and plastic face placements, XZ (+Y normal) with a v6 migration preserving older
+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).
+
+In scope, in priority order:
+1. SOLID and SKETCH (now).
+2. Parameters / functional constraints (done: see `parameters.*`, `expr.evaluate`; unit-aware,
+   cycles reported with their path, rename follows references, deletes list their users):
+   user parameters with units and expressions (+-*/, ^,
+   parentheses, sin/cos/sqrt/min/max/floor/ceil/round, unit conversion), model parameters
+   d1, d2… for every dimension and feature input, references between parameters with a
+   dependency graph and cycle detection, re-evaluation on change, comments, favourites,
+   CSV/JSON import and export.
+3. Components and assemblies with joints (M9).
+4. SHEET METAL: flange, contour flange, bend, unfold/refold, flat pattern with DXF export, sheet
+   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
+PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings.
+
+## Milestones
+
+| # | 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 |
+| 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 |
+| 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; edge flanges with their own angle and height per edge in one feature | 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 |
+
+## Dimensioning and error reporting
+
+- 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.
+  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.
+- 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.
+- Circular-pattern and angled-plane axes reject explicitly supplied malformed or expression
+  origins instead of silently rotating about zero. Numeric origins remain in millimetres;
+  associative axis expressions and construction-axis references remain unsupported.
+- Single-line and rectangle-side dimensioning supports selecting a line or its two endpoints.
+  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 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.
+  Component/canvas distance controls, sketch cursor coordinates, flat-pattern dimensions
+  and pocket depths, interference volumes and parts-library lengths also use design units.
+- Curvature and Polygon constraints accept complete preselected operands. Fix/Unfix
+  consumes complete point/curve selections consistently; mixed or ambiguous selections
+  retain the picking workflow. Rejected constraints preserve selection and undo history.
+- Contextual error reporting: a **Create Issue** action beside feature errors opens a
+  reviewable GitHub issue draft with the error, operation settings, build diagnostics and
+  useful reproduction context. The draft is editable, with optional capture of the actual
+  viewport and copy/save controls. Opening GitHub does not submit the issue. Help also exposes
+  reporting for unexpected results that did not produce an error.
+- The header exposes **Report a bug**, including an accessible compact control on
+  narrow windows. It opens the same editable report and screenshot review without
+  changing the active model or a pending dimension.
+- Crash reports: every panic (in a command, in the kernel, anywhere else) and every unclean
+  exit (abort, stack overflow, kill: found at the next start through a locked per-run command
+  journal) leaves a local report with the backtrace, version and commit, the command and the
+  design that reproduce it (`solidcraft-cli crashes replay <id>`). Repeats are counted, not
+  rewritten; at most 20 reports, 50 MB and 90 days. The app shows them after a crash (Help >
+  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).
+
+## 0.2.0 release batch
+
+- Includes the new axis navigation, adaptive sketch drawing/picking, origin-corner repairs,
+  durable supported profile/face references, endpoint dimensioning and contextual reporting.
+- Smooth ruled-wall display joins are hidden only within the supported geometric certificate;
+  authored splits and actual creases remain protected. Wireframe retains physical edges.
+- Paste New uses a bounded current-geometry comparison for supported convex line/circle
+  prisms with separated circular holes; unsupported shapes retain the existing strict check.
+- Common-bore Union retries check additional boundary curves before recutting the bore,
+  preventing the reproduced thin-web loss. Unknown additional trims refuse; inherited
+  common-cylinder trims retain their existing policy, so this is not a general Boolean proof.
+- Exact full-path assembly joint editing remains separate work and is not part of this batch.
+- Stable 0.2.0 is published: all release payload checksums, native cold reopening, deployed
+  web app and both Flatpak architectures were verified. The replacement README demo uses
+  the original electronics enclosure story and animated pointer in the actual English
+  0.2.0 UI, at 4× playback. Publication follows [the release workflow](docs/releasing.md).
+
+## 0.2.1 critical fixes
+
+- 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.
+- Eligible planar faces survive fillet, chamfer and shell operations with exact source
+  certificates. Sketches placed directly on the enclosure wall and inner floor follow
+  width and wall changes, including after the USB cut and cold reopening.
+- Remove artificial straight-wall and rounded-corner subdivisions left by shell and
+  extrusion cuts. Identical generated wall segments span adjacent slabs as one physical
+  face, with exact full-height supports and boundary stitching. Preserve authored face
+  splits and face appearances. Permanent regressions cover material, STEP, reopening and
+  unaffected bodies across the extrusion end plane.
+- Feature dialogs use the available screen height for their fields, with OK and Cancel
+  outside the scrolling region, including enlarged display scales.
+- Design format 13 records shell-face attachments. Older designs remain readable;
+  newly saved designs require 0.2.1 or later. Ambiguous or unsupported faces still refuse
+  attachment rather than guessing a plane.
+- Saved projections from a removed strip retain their geometry and report the lost
+  reference. Explicitly reselect the wall to repair that projection.
+
+## View navigation
+
+- 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
+  to 26 standard and diagonal views. Pointer motion accumulates independently of a lightly
+  damped spring, with a boundary margin to prevent flicker. Z-up/Y-up and the nearest square
+  top/bottom heading are preserved. Diagonals include 45-degree edge and isometric corner views.
+
+## Known limitations
+
+- Associative shell-face sketches require a unique certified planar source. Nested shell
+  attachments and ambiguous coincident sources 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
+  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;
+  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
+  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
+  convex planar body or of an extruded part; fillets inside patterns; closed chains of curved
+  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).
+- 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;
+  curved wall qualification rejects false transverse axes instead of filling holes.
+  Bodies touching along one whole face
+  (a part and its mirror image) are stitched; coincident planar faces are pushed apart when
+  their neighbours are planes or cylinders. Other coincident curved configurations can still
+  fail. Bounded containment classification preserves fully internal cavities and nested
+  material islands independently of shell order, with STEP round-trip and material-membership
+  regressions. Near-contact curved shells use the general boolean path rather than a
+  containment shortcut. Spheres are built from six pole-free patches.
+- Mass properties come from fine tessellation (curved faces within ~1e-4 relative); triangles
+  that cut through curved faces (trimmed faces after booleans) are split onto the surface first.
+- STEP import (our own reader, crates/kernel/src/step_in) reads solids (B-rep with analytic and B-spline geometry), units,
+  product names, colours and assemblies; analytic offsets on planes, cylinders, cones, spheres
+  and regular tori are read exactly (signed/nested distances, units and face sense). Freeform
+  offset surfaces and pcurve-only edges are not read yet,
+  and assembly components are flattened into bodies. Closed periodic faces (torus, B-spline
+  bands) are split in two for meshing; measure() uses a finer tolerance for small radii.
+- Persistent naming follows the kernel's exact face history (docs/book/src/dev/naming.md):
+  references resolve by name first, follow splits and merges, and warn when the entity split,
+  merged or vanished, or was found by geometry only (operations that report no history yet).
+  New planar sketch attachments use exact box, extrusion cap/side and immutable imported-face
+  source certificates with checked target and author occurrence paths. A missing or changed
+  source fails explicitly; Redefine Sketch Plane previews reattachment or a fixed plane while
+  retaining current geometry and dimension identities. Unsupported modified faces need an
+  explicit fixed plane. Legacy attachments retain their original resolver behavior.
+- Modelled threads are cut as a faceted body (curved faces within 1/200 of the pitch); Extrude
+  and Revolve To Object on a curved face cut the tool back to the target's surface.
+- Explicit sketch breaks preserve exact ellipses, fit/control splines (including high degrees)
+  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).
+- 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
+  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.
+  Newly captured adaptive profile references with complete source coverage retain their outer
+  and hole identities through span-count changes, including parameter edits after extrusion.
+  Partial, intersected or ambiguous boundaries do not qualify for these whole-source references.
+  Legacy curve-span multisets remain exact and unchanged; already-lost selections may need
+  reselection. Format 12 stores the new bounded whole-boundary references.
+  Projected analytic boundaries follow nested loop identities through resizing, including
+  stationary holes and rounded corners. Supported convex, tangent line-and-arc boundaries
+  can lose or regain corner arcs during an inset while preserving reserved curve identities
+  and linked profile selections. Format 12 saves those associations; compatible older closed
+  offsets upgrade structurally without changing their curve IDs. Breaking an association
+  freezes its current boundary and materializes downstream profile references. Child offsets
+  of a boundary with retired arcs still require breaking its association first; mixed or
+  nonconvex junctions and retained references to disappearing individual arcs remain limited.
+- Extrude and Revolve editors retain original direction, extent expressions, explicit targets,
+  axes, From/To inputs and All-profile intent. No-op edits preserve downstream dimension names
+  and selected occurrence frames; cancel and successful edits preserve one-step undo history.
+  Placed feature edits preview through the edited timeline entry, and cylindrical Emboss guides
+  use the sketch's actual target, author or uniquely placed third-component frame.
+  Revolve rotators follow the actual signed axis and support symmetric and two-sided extents;
+  dragging a To Object extent converts its derived value to an explicit angle. Legacy reversed-axis
+  symmetric geometry is preserved through format 11's explicit legacy convention. New revolves
+  use the sketch-normal direction for each selected profile, including To Object and curved
+  target trimming, independently of the selected axis sign.
+- Cylindrical emboss/deboss wraps bounded orthogonal line profiles, including holes, concave
+  outlines and nested islands, onto complete exterior cylinders or coaxial sleeves with exact
+  radial walls. New features infer a unique eligible cylinder when the face field is empty;
+  ambiguous targets require an explicit face. Saved target
+  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:
+  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.
+
+- 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
+  the origin; clicked UI regressions verify geometry, closed profiles and undo.
+- Sketch display: drawing, picking, highlighting, tool previews and profile shading share
+  adaptive projected curve boundaries. Fit, zoom, display scale and placed sketch frames
+  invalidate the display cache without changing CAD geometry or timeline history. Work
+  budgets and clipped paths prevent unbounded sampling or invented edges across the eye plane.
+  The Sketch Palette scrolls its options on short windows and enlarged displays while
+  keeping constraint status and Finish Sketch visible.
+- Face projection: closed boundaries have a deterministic outer-first order. Refresh matches
+  existing geometry before assigning positions, retaining saved curve IDs and constraints
+  across enumeration changes and resize, including concentric circles. Ambiguous identities
+  retain the last geometry and report a lost reference; permutation matching is bounded.
+- Project accepts complete supported preselection in one undo step. Visible external sketch
+  curves and points retain their source sketch identity; model geometry, axes and planes use
+  the existing linked projection commands. Rejection preserves the document and selection;
+  mixed selections retain ordinary tool-first picking.
+- Inline sketch dimensions: Tab and Shift+Tab cycle within the active shape's value boxes,
+  selecting visited values for replacement. Expression completion retains forward-Tab
+  priority; real keyboard regressions cover rectangles, lines and single-value circles.
+  Typed lengths, radii, line angles, signed arc sweeps and slot lengths persist as constraints
+  and expressions through save/reopen. Shape creation and its dimensions form one undo step;
+  rejected values keep the editable field focused.
+- Repeated components: Browser selection, visibility, properties, copy and Move/Copy use
+  checked occurrence paths. Active nested occurrences author planar sketches and solids in
+  their selected frame. Pending moves compose through parents; dialog cancellation restores
+  its selected move. Source materials and body/face appearances follow transformed instances.
+  Shared nested definitions remain shared. Deep Paste New copies reachable definition graphs,
+  independent feature/input histories, styles and internal motion records, with bounded geometry
+  checks and explicit external-link notices. Paste New selects the copy while preserving the active
+  authoring context. Imported periodic STEP seams survive placement and reexport with shared
+  topology and appearances intact. Recorded body transfers preserve historical Join/Cut membership,
+  material, placements and machining data through edits, copying, undo and reopen. New 3D wires
+  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.
+- Parameter creation supports Enter with validation and continued keyboard entry. Shared
+  expression autocomplete supports Up/Down selection, Enter/Tab acceptance and Escape dismissal;
+  accepting a suggestion does not submit a parameter or trigger viewport shortcuts.
+- Movable window title bars follow the app's dark/light header palette. Radial right-click
+  menus are opt-in in Preferences > Navigation; ordinary context menus remain the default.
+- Desktop distribution: running Windows windows and executable resources use the app icon;
+  packaging validates icon resources. Nix installs launchers, MIME data and generated icons,
+  with explicit launch apps and Vulkan-loader/driver discovery. Flatpak feed instructions
+  register the required runtime source; release checks exercise desktop modelling on X11/Wayland.
+- OpenGL rendering clamps effective anti-aliasing to 1x across UI pipelines, textures and CAD
+  callbacks to prevent black frames. Other backends retain the requested sample count, and
+  stored preferences remain unchanged.
+- Configuration rules: ordered typed conditions can drive parameters and suppressions or
+  restrict values. Preview explains effective values without modifying the document; applying
+  rules validates rows atomically. Length expressions retain their authoring units across
+  document-unit changes. The UI supports structured All/Any/Not conditions and rule ordering.
+  Component styles and certified semantic face styles are available; unsupported lineage refuses
+  atomically, and stale certified face paint cannot jump to another surface. See [configurations](docs/configurations.md).
+- Sheet-metal material: inherited holes, crossing edge notches, overlapping cuts and retained
+  islands share the same boundaries in flat preview, DXF and unfolded solids. Detached material
+  pieces survive unfold/refold as one logical sheet group, including split flanged sheets.
+  Cut-outs made in the flat pattern cross bends at any angle or curved: their edges fold to
+  helices and curves on the bend, their walls square to the sheet. Free-form bases use bounded
+  sampling.
+  Parallel prismatic partial-depth cuts retain pocket side and depth through transfer and
+  unfold/refold, with separate pocket contours in preview and DXF. Planar Intersect preserves
+  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.
+- 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
+  check. Under-resolved fits return an error.
+- Contact driving checks the trajectory between clear endpoints, including linked joints,
+  playback and sparse motion exports. Checks use bounded tessellation samples, not exact
+  continuous collision detection; local thin walls and small details remain limitations.
+  See [contact-set limits and recovery](docs/contact-sets.md).
+
+## 3D sketch bridges
+
+3D sketch drawing snaps to points on other visible sketch planes without flattening them onto
+the active plane. Bridge endpoints capture their source positions; associative endpoint links,
+construction-plane selection of 3D wires and loft guide rails remain separate work.
+Feature dialog header chevrons collapse and restore the form without discarding selections
+or edited values, including the Appearance panel.
+## Construction on 3D paths
+
+Plane Along Path has a viewport path selector, fractional position, live preview and timeline
+editing. Construction planes and points resolve drawn 3D wires without applying their sketch
+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.
+
+## Document-opening performance
+
+- Desktop STEP import prepares consecutive independent solids in bounded batches with up
+  to eight workers, retaining serial traversal, result order and persistent source identities.
+  The web path remains serial. Original multi-solid fixtures show 64–81% lower complete
+  import times; single-solid assembly parts are not scheduled across nodes. See
+  [measurements and limits](docs/perf.md#parallel-step-body-preparation-2026-10-12).
+- 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.
+  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.
+
+- Cold rebuild profiling separates parsing, geometry, placement, display meshing and
+  thumbnails. Straight-line closest-point projection and exact curved-surface evaluation
+  reuse reduce repeated work without relaxing geometry checks. Three alternating optimized
+  benchmark runs reduce median rebuild time by 26% on the public sensor enclosure and 22%
+  on a local case assembly; shape measurements and topology match the original build.
+  See [performance measurements](docs/perf.md). Further cold Boolean and import costs remain.
+- Prepared assembly geometry survives selection and view changes while real geometry and
+  placement changes invalidate it. A Pi assembly edge-selection probe drops from 9.24 s to
+  0.57 s; initial opening is unchanged. Actual Windows desktop profiling measures 15.87 s
+  median opening, with 82% spent rebuilding geometry; halving full opening remains open.
+
+## Kernel
+
+- Successful Boolean retries report their strategy and numerical adjustments as
+  feature warnings and structured inspection data. Diagnostics survive cached
+  evaluation, undo/redo and cold reopening; the robustness runner counts retry
+  events by strategy and reports any bounded-log truncation. Existing geometry
+  acceptance checks remain in force.
+
+- 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.
+- Shell of a stepped, joined planar body no longer creates horizontal subdivisions across
+  continuous walls. Fresh axis-aligned Cut walls are stitched using their exact construction
+  support and shared topology, preserving real steps and intentional boundaries. The local
+  reported case returns from 86 to 49 faces with unchanged material and bounds; regressions
+  cover stepped stock, STEP round trips and saved projections from removed pieces.
+
+truck (Apache-2.0) behind our own `kernel` crate, with our own blend operation and boolean
+retry/validation; see `plan/adr/0001-geometry-kernel.md` (local) — summary in README.

apps/app_icon.rs

@@ -0,0 +1,126 @@
+//! Original SolidCraft mark, shared by desktop, packaging and CLI.
+/// This block is the icon image data
+pub fn rgba(size: usize) -> Result<Vec<u8>, String> {
+    if !(1..=2048).contains(&size) {
+        return Err("icon size must be 1..=2048".into());
+    }
+    type P = (f32, f32);
+    // Coverage buffer at 4x4 samples per pixel (2x2 for big sizes), averaged down at the end.
+    let ss = if size > 512 { 2 } else { 4 };
+    let n = size * ss;
+    let mut buf = vec![[0u8; 4]; n * n];
+    let s = n as f32 / 412.217; // SVG units -> samples: the logo fills the height
+    let ox = (n as f32 - 357.0 * s) / 2.0; // and is centred sideways
+    // Fill a convex polygon given in SVG units.
+    let mut fill = |pts: &[P], col: [u8; 3]| {
+        let v: Vec<P> = pts.iter().map(|p| (ox + p.0 * s, p.1 * s)).collect();
+        let (top, bottom) = v.iter().fold((f32::MAX, f32::MIN), |(a, b), p| (a.min(p.1), b.max(p.1)));
+        for y in ((top - 0.5).ceil() as i32).max(0)..=((bottom - 0.5).floor() as i32).min(n as i32 - 1) {
+            let cy = y as f32 + 0.5;
+            let (mut lo, mut hi) = (f32::MAX, f32::MIN);
+            for i in 0..v.len() {
+                let (a, b) = (v[i], v[(i + 1) % v.len()]);
+                if (a.1 <= cy) != (b.1 <= cy) {
+                    let x = a.0 + (cy - a.1) / (b.1 - a.1) * (b.0 - a.0);
+                    lo = lo.min(x);
+                    hi = hi.max(x);
+                }
+            }
+            if lo > hi {
+                continue;
+            }
+            for x in ((lo - 0.5).ceil() as i32).max(0)..=((hi - 0.5).floor() as i32).min(n as i32 - 1) {
+                buf[y as usize * n + x as usize] = [col[0], col[1], col[2], 255];
+            }
+        }
+    };
+    // Faces: each is a few overlapping convex pieces (the filler only does convex shapes).
+    let (light, mid, dark) = ([96, 158, 236], [58, 136, 238], [55, 108, 197]);
+    fill(&[(3.5, 105.9), (177.0, 5.8), (263.4, 55.6), (263.8, 156.0), (177.0, 406.4)], light);
+    fill(&[(177.0, 206.1), (263.8, 156.0), (350.5, 206.2), (350.5, 306.3), (177.0, 406.4)], light);
+    fill(&[(3.5, 105.9), (177.0, 206.1), (177.0, 406.4)], mid);
+    fill(&[(3.5, 105.9), (3.5, 205.7), (90.3, 256.2), (177.0, 206.1)], mid);
+    fill(&[(177.0, 206.1), (90.3, 256.2), (90.0, 356.2), (177.0, 406.4)], mid);
+    fill(&[(264.1, 155.8), (177.0, 206.1), (177.0, 406.4), (263.8, 256.2)], dark);
+    fill(&[(263.8, 256.2), (350.5, 206.2), (350.5, 306.3), (177.0, 406.4)], dark);
+    fill(&[(177.0, 206.1), (177.0, 406.4), (350.5, 306.3)], dark);
+    fill(&[(263.8, 55.9), (263.8, 156.0), (177.1, 105.9)], dark);
+    // White edge lines, 10 units wide: a rectangle per segment and a disc at each inner corner.
+    let white = [255, 255, 255];
+    let mut stroke = |pts: &[P], closed: bool| {
+        let m = pts.len();
+        for i in 0..(if closed { m } else { m - 1 }) {
+            let (a, b) = (pts[i], pts[(i + 1) % m]);
+            let l = ((b.0 - a.0).powi(2) + (b.1 - a.1).powi(2)).sqrt();
+            let (nx, ny) = (-(b.1 - a.1) / l * 5.0, (b.0 - a.0) / l * 5.0);
+            fill(&[(a.0 + nx, a.1 + ny), (b.0 + nx, b.1 + ny), (b.0 - nx, b.1 - ny), (a.0 - nx, a.1 - ny)], white);
+        }
+        for c in &pts[if closed { 0 } else { 1 }..if closed { m } else { m - 1 }] {
+            let disc: Vec<P> = (0..16)
+                .map(|k| {
+                    let t = k as f32 * std::f32::consts::TAU / 16.0;
+                    (c.0 + 5.0 * t.cos(), c.1 + 5.0 * t.sin())
+                })
+                .collect();
+            fill(&disc, white);
+        }
+    };
+    stroke(&[(263.8, 55.9), (177.1, 105.9), (263.8, 156.0), (263.8, 256.2), (350.6, 206.1)], false);
+    stroke(&[(5.0, 105.9), (178.5, 206.1), (178.5, 406.4)], false);
+    stroke(&[(177.0, 206.1), (263.8, 156.0)], false);
+    stroke(
+        &[
+            (178.5, 5.8),
+            (5.0, 105.9),
+            (5.0, 206.1),
+            (91.7, 256.2),
+            (91.7, 356.4),
+            (178.5, 406.4),
+            (352.0, 306.3),
+            (352.0, 206.1),
+            (265.2, 156.0),
+            (265.2, 55.9),
+        ],
+        true,
+    );
+    // Average each ss x ss block down to one pixel (straight alpha = covered share).
+    let mut rgba = Vec::with_capacity(size * size * 4);
+    for y in 0..size {
+        for x in 0..size {
+            let (mut sum, mut cnt) = ([0u32; 3], 0u32);
+            for j in 0..ss {
+                for i in 0..ss {
+                    let p = buf[(y * ss + j) * n + x * ss + i];
+                    if p[3] != 0 {
+                        cnt += 1;
+                        for k in 0..3 {
+                            sum[k] += u32::from(p[k]);
+                        }
+                    }
+                }
+            }
+            if cnt == 0 {
+                rgba.extend_from_slice(&[0, 0, 0, 0]);
+            } else {
+                let a = 255 * cnt / (ss * ss) as u32;
+                rgba.extend_from_slice(&[(sum[0] / cnt) as u8, (sum[1] / cnt) as u8, (sum[2] / cnt) as u8, a as u8]);
+            }
+        }
+    }
+    Ok(rgba)
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn shared_mark_has_transparency_and_original_colors_at_window_and_package_sizes() {
+        for size in [16, 24, 32, 48, 64, 128, 256] {
+            let pixels = super::rgba(size).expect("valid size");
+            assert_eq!(pixels.len(), size * size * 4);
+            assert!(pixels.as_chunks::<4>().0.iter().any(|p| p[3] == 0));
+            assert!(pixels.as_chunks::<4>().0.iter().any(|p| p[3] == 255 && p[2] > p[0]));
+        }
+        assert!(super::rgba(0).is_err());
+        assert!(super::rgba(2049).is_err());
+    }
+}

apps/solidcraft-cli/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "solidcraft-cli"
+description = "SolidCraft headless CLI: run command scripts, measure, export, render snapshots, replay oracle recipes"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+default-run = "solidcraft-cli"
+
+[lints]
+workspace = true
+
+[[bin]]
+name = "solidcraft-cli"
+path = "src/main.rs"
+
+# Compatibility alias for the CLI's former name: forwards to solidcraft-cli with a deprecation
+# note on stderr. Shipped in every package for at least one release.
+[[bin]]
+name = "solvecraft-cli"
+path = "src/alias.rs"
+
+[dependencies]
+solidcraft-engine = { workspace = true }
+solidcraft-mcp = { workspace = true }
+serde_json = { workspace = true }

apps/solidcraft-cli/src/alias.rs

@@ -0,0 +1,30 @@
+//! `solvecraft-cli`: the CLI's former name, kept for at least one release so existing scripts
+//! and MCP client setups (`claude mcp add solvecraft -- solvecraft-cli mcp`) keep working.
+//! Compatibility shim: it runs `solidcraft-cli` (next to this executable, else on PATH) with the
+//! same arguments and standard streams, after a one-line deprecation note on stderr (stdout
+//! stays clean for MCP's JSON-RPC), and exits with its status.
+#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
+#![forbid(unsafe_code)]
+
+use std::process::{Command, ExitCode};
+
+const TARGET: &str = "solidcraft-cli";
+
+fn main() -> ExitCode {
+    eprintln!("solvecraft-cli is deprecated and will be removed in a later release: use solidcraft-cli");
+    let sibling = std::env::current_exe()
+        .ok()
+        .and_then(|exe| exe.parent().map(|dir| dir.join(format!("{TARGET}{}", std::env::consts::EXE_SUFFIX))))
+        .filter(|p| p.is_file());
+    let program = sibling.map(|p| p.into_os_string()).unwrap_or_else(|| TARGET.into());
+    match Command::new(&program).args(std::env::args_os().skip(1)).status() {
+        Ok(status) => match status.code() {
+            Some(code) => ExitCode::from(u8::try_from(code).unwrap_or(1)),
+            None => ExitCode::FAILURE,
+        },
+        Err(e) => {
+            eprintln!("solvecraft-cli: could not run {}: {e}", program.to_string_lossy());
+            ExitCode::FAILURE
+        }
+    }
+}

apps/solidcraft-cli/src/crashes.rs

@@ -0,0 +1,103 @@
+//! `solidcraft-cli crashes`: the crash reports the desktop app wrote on this computer
+//! (docs/crash-reports.md): list them, show one, replay one, delete them.
+
+use std::sync::Mutex;
+
+use serde_json::{Value, json};
+use solidcraft_engine::crash;
+
+const USAGE: &str = "usage: solidcraft-cli crashes [list [--json] | show <id> | replay <id> | dir | clear [<id>]]";
+
+pub fn run(args: &[String]) -> Result<(), String> {
+    let dir = crash::default_dir().ok_or("no crash folder on this system")?;
+    let id = || args.get(1).map(String::as_str).ok_or_else(|| USAGE.to_string());
+    match args.first().map(String::as_str) {
+        None | Some("list") => {
+            let reports = crash::list(&dir);
+            if args.iter().any(|a| a == "--json") {
+                println!("{}", super::pretty(&json!({ "dir": dir.to_string_lossy(), "reports": reports })));
+                return Ok(());
+            }
+            println!("crash reports in {}", dir.display());
+            if reports.is_empty() {
+                println!("  (none)");
+            }
+            for r in reports {
+                let times = if r.count > 1 { format!(" ×{}", r.count) } else { String::new() };
+                let cmd = r.command.map(|c| format!(" in {c}")).unwrap_or_default();
+                let replay = if r.replayable { "  [replayable]" } else { "" };
+                println!("  {}  {}{times}{cmd}  v{}{replay}\n      {}", r.id, r.kind, r.version, r.message);
+            }
+            Ok(())
+        }
+        Some("show") => {
+            println!("{}", super::pretty(&crash::read(&dir, id()?)?));
+            Ok(())
+        }
+        Some("replay") => replay(&crash::read(&dir, id()?)?),
+        Some("dir") => {
+            println!("{}", dir.display());
+            Ok(())
+        }
+        Some("clear") => {
+            println!("deleted {} report(s)", crash::clear(&dir, args.get(1).map(String::as_str)));
+            Ok(())
+        }
+        _ => Err(USAGE.to_string()),
+    }
+}
+
+/// Panics seen while replaying: (location, message).
+static PANICS: Mutex<Vec<(String, String)>> = Mutex::new(Vec::new());
+
+/// Run a report's commands on its design and say whether the crash happens again.
+fn replay(report: &Value) -> Result<(), String> {
+    let id = report["id"].as_str().unwrap_or_default();
+    let replay_path = report["replay_path"].as_str().ok_or_else(|| format!("report {id} cannot be replayed (see its notes)"))?;
+    let script = super::read_json(replay_path)?;
+    let commands = script["commands"].as_array().cloned().unwrap_or_default();
+    let mut s = match report["design_path"].as_str() {
+        Some(d) => super::load(d)?,
+        None => solidcraft_engine::Session::default(),
+    };
+    std::panic::set_hook(Box::new(|info| {
+        let loc = info.location().map_or_else(|| "(unknown)".to_string(), |l| format!("{}:{}", l.file(), l.line()));
+        let msg = info.payload_as_str().unwrap_or("(not a text message)").to_string();
+        if let Ok(mut p) = PANICS.lock() {
+            p.push((loc, msg));
+        }
+    }));
+    if report["kind"] == "unclean_exit" {
+        println!("this crash ended the app without a report: if this process ends abruptly, it reproduced");
+    }
+    println!(
+        "replaying {} command(s) on {}",
+        commands.len(),
+        report["design_path"].as_str().map_or_else(|| "a new design".to_string(), |d| d.to_string())
+    );
+    for (i, c) in commands.iter().enumerate() {
+        let cmd = c["command"].as_str().unwrap_or_default();
+        let r = s.execute(cmd, c.get("params").unwrap_or(&Value::Null));
+        match r {
+            Ok(_) => println!("  {:>3}. {cmd}: ok", i + 1),
+            Err(e) => println!("  {:>3}. {cmd}: {e}", i + 1),
+        }
+    }
+    let _ = std::panic::take_hook();
+    let seen = PANICS.lock().map(|p| p.clone()).unwrap_or_default();
+    let want = report["signature"].as_str().unwrap_or_default();
+    let same = seen.iter().any(|(l, m)| format!("{:016x}", crash::signature(l, m)) == want);
+    if same {
+        println!(
+            "reproduced: the same internal error ({}) at {}",
+            report["message"].as_str().unwrap_or_default(),
+            report["location"].as_str().unwrap_or_default()
+        );
+    } else if let Some((l, m)) = seen.first() {
+        println!("an internal error happened, but not the reported one: {m} at {l}");
+        println!("(the report says: {} at {})", report["message"].as_str().unwrap_or_default(), report["location"].as_str().unwrap_or_default());
+    } else {
+        println!("did not reproduce: no internal error (fixed, or it depends on something the replay does not have)");
+    }
+    Ok(())
+}

apps/solidcraft-cli/src/fuzz.rs

@@ -0,0 +1,263 @@
+//! `solidcraft-cli fuzz`: random modelling sessions and boolean checks (docs/robustness.md).
+//!
+//! Each seed runs in its own process (`fuzz-one`) with a time limit, so a hang or a hard crash
+//! is recorded like any other failure.
+
+use std::collections::BTreeMap;
+use std::io::{BufRead, BufReader, Read};
+use std::process::{Command, Stdio};
+use std::time::{Duration, Instant};
+
+use serde_json::{Value, json};
+use solidcraft_engine::fuzz;
+use solidcraft_engine::fuzz::boolean_case;
+
+fn flag<T: std::str::FromStr>(args: &[String], name: &str, default: T) -> T {
+    args.iter().position(|a| a == name).and_then(|i| args.get(i + 1)).and_then(|v| v.parse().ok()).unwrap_or(default)
+}
+
+/// One seed: a design and a boolean case, as JSON on stdout (progress on stderr).
+pub fn one(args: &[String]) -> Result<(), String> {
+    let seed: u64 = args.first().and_then(|s| s.parse().ok()).ok_or("fuzz-one <seed> [--steps N] [--minimise]")?;
+    let steps = flag(args, "--steps", 8usize);
+    let minimise = args.iter().any(|a| a == "--minimise");
+    // Panics caught inside the kernel: harmless natively, fatal in the web build.
+    static PANICS: std::sync::atomic::AtomicUsize = std::sync::atomic::AtomicUsize::new(0);
+    std::panic::set_hook(Box::new(|_| {
+        PANICS.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+    }));
+    eprintln!("design {seed}");
+    let run = fuzz::run_with(seed, steps, &mut |st| eprintln!("step {}", serde_json::to_string(st).unwrap_or_default()));
+    let mut design = json!({
+        "outcome": run.outcome,
+        "steps": run.steps.iter().map(|s| s.kind).collect::<Vec<_>>(),
+        "unsupported": run.unsupported,
+        "rejected": run.rejected,
+        "boolean_fallbacks": run.boolean_fallbacks,
+        "boolean_reports_truncated": run.boolean_reports_truncated,
+        "panics": PANICS.swap(0, std::sync::atomic::Ordering::SeqCst),
+    });
+    if run.outcome.is_bug() {
+        design["script"] = run.script();
+        if minimise {
+            eprintln!("minimise");
+            let m = fuzz::minimise(&run);
+            design["minimal"] = json!({"outcome": m.outcome, "steps": m.steps.iter().map(|s| s.kind).collect::<Vec<_>>(), "script": m.script()});
+        }
+    }
+    let (a, b) = solidcraft_engine::fuzz::boolean_shapes(seed);
+    eprintln!("boolean {seed} {} {}", serde_json::to_string(&a).unwrap_or_default(), serde_json::to_string(&b).unwrap_or_default());
+    let b = boolean_case(seed);
+    let bp = PANICS.swap(0, std::sync::atomic::Ordering::SeqCst);
+    println!("{}", json!({"seed": seed, "design": design, "boolean": b, "boolean_panics": bp}));
+    Ok(())
+}
+
+struct Job {
+    seed: u64,
+    child: std::process::Child,
+    started: Instant,
+    err: std::sync::mpsc::Receiver<String>,
+    last: String,
+}
+
+/// Run seeds `--from`…`--from + --count` in `--jobs` processes, `--timeout` seconds each;
+/// write failing scripts to `--out` and a summary to `--report`.
+pub fn run(args: &[String]) -> Result<(), String> {
+    let from = flag(args, "--from", 0u64);
+    let count = flag(args, "--count", 100u64);
+    let last = from.checked_add(count.saturating_sub(1)).ok_or("seed range exceeds u64::MAX: reduce --from or --count")?;
+    let mut seeds = (count > 0).then_some(from..=last).into_iter().flatten().peekable();
+    let jobs = flag(args, "--jobs", 4usize).clamp(1, 64);
+    let timeout = Duration::from_secs(flag(args, "--timeout", 120u64));
+    let steps = flag(args, "--steps", 8usize);
+    let out_dir = args.iter().position(|a| a == "--out").and_then(|i| args.get(i + 1)).cloned();
+    let report = args.iter().position(|a| a == "--report").and_then(|i| args.get(i + 1)).cloned();
+    let minimise = args.iter().any(|a| a == "--minimise");
+    let exe = std::env::current_exe().map_err(|e| e.to_string())?;
+    if let Some(d) = &out_dir {
+        std::fs::create_dir_all(d).map_err(|e| format!("{d}: {e}"))?;
+    }
+    let mut running: Vec<Job> = Vec::new();
+    let mut results: Vec<Value> = Vec::new();
+    let t0 = Instant::now();
+    while seeds.peek().is_some() || !running.is_empty() {
+        while running.len() < jobs {
+            let Some(seed) = seeds.next() else { break };
+            let mut cmd = Command::new(&exe);
+            cmd.args(["fuzz-one", &seed.to_string(), "--steps", &steps.to_string()]);
+            if minimise {
+                cmd.arg("--minimise");
+            }
+            let mut child = cmd.stdout(Stdio::piped()).stderr(Stdio::piped()).spawn().map_err(|e| e.to_string())?;
+            let (tx, rx) = std::sync::mpsc::channel();
+            if let Some(err) = child.stderr.take() {
+                std::thread::spawn(move || {
+                    for line in BufReader::new(err).lines().map_while(Result::ok) {
+                        if tx.send(line).is_err() {
+                            break;
+                        }
+                    }
+                });
+            }
+            running.push(Job { seed, child, started: Instant::now(), err: rx, last: String::new() });
+        }
+        std::thread::sleep(Duration::from_millis(50));
+        let mut i = 0;
+        while i < running.len() {
+            let Some(j) = running.get_mut(i) else { break };
+            while let Ok(l) = j.err.try_recv() {
+                if l.starts_with("step") || l.starts_with("boolean") || l.starts_with("minimise") {
+                    j.last = l;
+                }
+            }
+            let done = match j.child.try_wait() {
+                Ok(Some(status)) => {
+                    let mut s = String::new();
+                    if let Some(mut o) = j.child.stdout.take() {
+                        let _ = o.read_to_string(&mut s);
+                    }
+                    Some(match serde_json::from_str::<Value>(s.trim()) {
+                        Ok(v) => v,
+                        Err(_) => json!({"seed": j.seed, "crash": format!("exit {status}"), "at": j.last}),
+                    })
+                }
+                Ok(None) if j.started.elapsed() > timeout => {
+                    let _ = j.child.kill();
+                    let _ = j.child.wait();
+                    Some(json!({"seed": j.seed, "timeout": timeout.as_secs(), "at": j.last}))
+                }
+                Ok(None) => None,
+                Err(e) => Some(json!({"seed": j.seed, "crash": e.to_string(), "at": j.last})),
+            };
+            match done {
+                Some(v) => {
+                    record(&v, out_dir.as_deref());
+                    results.push(v);
+                    running.swap_remove(i);
+                }
+                None => i += 1,
+            }
+        }
+    }
+    let summary = summarise(&results, t0.elapsed());
+    println!("{summary}");
+    if let Some(r) = report {
+        std::fs::write(&r, &summary).map_err(|e| format!("{r}: {e}"))?;
+    }
+    Ok(())
+}
+
+/// Print a failure as it comes in and keep its script.
+fn record(v: &Value, out_dir: Option<&str>) {
+    let seed = v["seed"].as_u64().unwrap_or(0);
+    let d = &v["design"];
+    let bug = matches!(d["outcome"]["kind"].as_str(), Some("failed" | "panic" | "invalid" | "volume"));
+    if bug || v.get("timeout").is_some() || v.get("crash").is_some() {
+        eprintln!("seed {seed}: {}", if bug { format!("{} {}", d["outcome"]["kind"], d["outcome"]["detail"]) } else { format!("{v}") });
+    }
+    let bk = v["boolean"]["outcome"].as_str().unwrap_or("ok");
+    if bk != "ok" {
+        eprintln!("seed {seed}: boolean {bk} {}", v["boolean"]["detail"]);
+    }
+    if let Some(dir) = out_dir {
+        use std::io::Write;
+        if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open(format!("{dir}/results.jsonl")) {
+            let _ = writeln!(f, "{v}");
+        }
+        if bug {
+            let script = if d.get("minimal").is_some() { &d["minimal"]["script"] } else { &d["script"] };
+            let _ = std::fs::write(format!("{dir}/design-{seed}.json"), serde_json::to_string_pretty(script).unwrap_or_default());
+        }
+        if bk != "ok" {
+            let _ = std::fs::write(format!("{dir}/boolean-{seed}.json"), serde_json::to_string_pretty(&v["boolean"]).unwrap_or_default());
+        }
+    }
+}
+
+fn summarise(results: &[Value], took: Duration) -> String {
+    let n = results.len().max(1);
+    let mut design: BTreeMap<String, usize> = BTreeMap::new();
+    let mut boolean: BTreeMap<String, usize> = BTreeMap::new();
+    let mut at_step: BTreeMap<String, usize> = BTreeMap::new();
+    let mut unsupported: BTreeMap<String, usize> = BTreeMap::new();
+    let mut fallbacks: BTreeMap<String, [u64; 2]> = BTreeMap::new();
+    let mut truncated = [0usize; 2];
+    let mut steps = 0;
+    let (mut dp, mut bp) = (0, 0);
+    for v in results {
+        for (i, group) in ["design", "boolean"].into_iter().enumerate() {
+            if v[group]["boolean_reports_truncated"].as_bool().unwrap_or(false) {
+                truncated[i] += 1;
+            }
+            if let Some(counts) = v[group]["boolean_fallbacks"].as_object() {
+                for (strategy, count) in counts {
+                    if let Some(total) = fallbacks.entry(strategy.clone()).or_default().get_mut(i) {
+                        *total = total.saturating_add(count.as_u64().unwrap_or(0));
+                    }
+                }
+            }
+        }
+        dp += usize::from(v["design"]["panics"].as_u64().unwrap_or(0) > 0);
+        bp += usize::from(v["boolean_panics"].as_u64().unwrap_or(0) > 0);
+        let k = if v.get("timeout").is_some() {
+            "timeout".to_string()
+        } else if v.get("crash").is_some() {
+            "crash".to_string()
+        } else {
+            v["design"]["outcome"]["kind"].as_str().unwrap_or("?").to_string()
+        };
+        if k != "ok" {
+            let last = v["design"]["steps"].as_array().and_then(|a| a.last()).and_then(Value::as_str).unwrap_or("?");
+            *at_step.entry(format!("{k} at {last}")).or_default() += 1;
+        }
+        *design.entry(k).or_default() += 1;
+        *boolean.entry(v["boolean"]["outcome"].as_str().unwrap_or("not run").to_string()).or_default() += 1;
+        steps += v["design"]["steps"].as_array().map(Vec::len).unwrap_or(0);
+        for u in v["design"]["unsupported"].as_array().into_iter().flatten() {
+            *unsupported.entry(u[0].as_str().unwrap_or("?").to_string()).or_default() += 1;
+        }
+    }
+    let pct = |c: usize| format!("{c} ({:.1} %)", 100.0 * c as f64 / n as f64);
+    let mut s = format!("{} seeds, {steps} design steps, {:.0} s\n\nDesigns:\n", results.len(), took.as_secs_f64());
+    for (k, c) in &design {
+        s += &format!("- {k}: {}\n", pct(*c));
+    }
+    s += "\nFailures by step:\n";
+    for (k, c) in &at_step {
+        s += &format!("- {k}: {c}\n");
+    }
+    s += "\nSteps refused as not supported (undone, the design went on):\n";
+    for (k, c) in &unsupported {
+        s += &format!("- {k}: {c}\n");
+    }
+    s += &format!("\nCaught panics (fatal in the web build): designs {}, boolean checks {}\n", pct(dp), pct(bp));
+    s += "\nBoolean identity (union, intersection, cut of two primitives):\n";
+    for (k, c) in &boolean {
+        s += &format!("- {k}: {}\n", pct(*c));
+    }
+    s += "\nSuccessful Boolean retries (events, including nested operations):\n";
+    for (strategy, [designs, checks]) in &fallbacks {
+        s += &format!("- {strategy}: designs {designs}, boolean checks {checks}\n");
+    }
+    s += &format!("- Capped reports: designs {}, boolean checks {}\n", truncated[0], truncated[1]);
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn report_counts_retry_events_separately_and_marks_incomplete_logs() {
+        let results = [
+            json!({"design":{"outcome":{"kind":"ok"},"boolean_fallbacks":{"shifted_operands":2}},"boolean":{"outcome":"ok","boolean_fallbacks":{"shifted_operands":3},"boolean_reports_truncated":true}}),
+            json!({"design":{"outcome":{"kind":"ok"},"boolean_fallbacks":{"shifted_operands":1}},"boolean":{"outcome":"ok"}}),
+            json!({"timeout":90}),
+        ];
+        let text = summarise(&results, Duration::ZERO);
+        assert!(text.contains("shifted_operands: designs 3, boolean checks 3"), "{text}");
+        assert!(text.contains("Capped reports: designs 0, boolean checks 1"), "{text}");
+        assert!(text.contains("timeout: 1 (33.3 %)"), "{text}");
+    }
+}

apps/solidcraft-cli/src/main.rs

@@ -0,0 +1,420 @@
+//! 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 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 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 crashes;
+mod fuzz;
+mod oracle;
+mod recipe;
+mod spatial;
+
+use std::process::ExitCode;
+
+use serde_json::{Value, json};
+#[path = "../../app_icon.rs"]
+mod app_icon;
+
+use solidcraft_engine::Session;
+use solidcraft_engine::render::{StandardView, render_png};
+
+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 --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]
+  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 crashes [list [--json] | show <id> | replay <id> | dir | clear [<id>]]
+  solidcraft-cli licences
+  solidcraft-cli icon --out icon.png [--size 256] | --out icon.ico
+";
+
+fn main() -> ExitCode {
+    let args: Vec<String> = std::env::args().skip(1).collect();
+    let r = match args.first().map(String::as_str) {
+        Some("run") => cmd_run(&args[1..]),
+        Some("eval" | "inspect") => cmd_eval(&args[1..]),
+        Some("snapshot") => cmd_snapshot(&args[1..]),
+        Some("exec") => cmd_exec(&args[1..]),
+        Some("commands") => {
+            use std::io::Write as _;
+            let mut s = Session::default();
+            s.execute("engine.commands", &json!({})).map_err(|e| e.to_string()).and_then(|v| {
+                // A pipeline consumer may stop early (e.g. `commands | head`).
+                // Unlike println!, writing explicitly lets us handle that without a panic.
+                match writeln!(std::io::stdout().lock(), "{}", pretty(&v)) {
+                    Ok(()) => Ok(()),
+                    Err(e) if e.kind() == std::io::ErrorKind::BrokenPipe => Ok(()),
+                    Err(e) => Err(format!("stdout: {e}")),
+                }
+            })
+        }
+        Some("recipe") => args.get(1).ok_or_else(|| USAGE.to_string()).and_then(|p| {
+            let v = read_json(p)?;
+            recipe::to_script(&v).map(|s| println!("{}", pretty(&s)))
+        }),
+        Some("oracle") => oracle::run(&args[1..]),
+        Some("fuzz") => fuzz::run(&args[1..]),
+        Some("fuzz-one") => fuzz::one(&args[1..]),
+        Some("mcp") => cmd_mcp(&args[1..]),
+        Some("crashes") => crashes::run(&args[1..]),
+        Some("icon") => cmd_icon(&args[1..]),
+        Some("licences" | "licenses") => {
+            // Written, not print!ed: a closed pipe (`| head`) is not a crash.
+            use std::io::Write as _;
+            let _ = std::io::stdout().lock().write_all(solidcraft_engine::licences::all().as_bytes());
+            Ok(())
+        }
+        // Hidden, for the kill-mid-save test: save a large design over and over.
+        Some("save-stress") => cmd_save_stress(&args[1..]),
+        // 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..]),
+        Some("--version" | "-V") => {
+            println!("solidcraft-cli {}", env!("CARGO_PKG_VERSION"));
+            Ok(())
+        }
+        _ => Err(USAGE.to_string()),
+    };
+    match r {
+        Ok(()) => ExitCode::SUCCESS,
+        Err(e) => {
+            eprintln!("error: {e}");
+            ExitCode::FAILURE
+        }
+    }
+}
+
+fn pretty(v: &Value) -> String {
+    serde_json::to_string_pretty(v).unwrap_or_default()
+}
+
+pub fn read_json(path: &str) -> Result<Value, String> {
+    // Through the engine's file access, which refuses anything that is not a regular file and
+    // reads no more than the cap: a character device or a FIFO would otherwise never end.
+    let s = solidcraft_engine::io::vfs::read_to_string(path, solidcraft_engine::io::MAX_DESIGN_BYTES).map_err(|e| format!("{path}: {e}"))?;
+    serde_json::from_str(&s).map_err(|e| format!("{path}: {e}"))
+}
+
+/// 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> {
+    let mut s = Session::default();
+    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);
+    }
+    let bytes = solidcraft_engine::io::vfs::read(path, solidcraft_engine::io::MAX_DESIGN_BYTES).map_err(|e| format!("{path}: {e}"))?;
+    if solidcraft_engine::io::is_design_container(&bytes) {
+        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());
+        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())?;
+    }
+    Ok(s)
+}
+
+fn flag<'a>(args: &'a [String], name: &str) -> Option<&'a str> {
+    args.iter().position(|a| a == name).and_then(|i| args.get(i + 1)).map(String::as_str)
+}
+
+fn flags<'a>(args: &'a [String], name: &str) -> Vec<&'a str> {
+    args.windows(2).filter(|w| w[0] == name).map(|w| w[1].as_str()).collect()
+}
+
+/// The first argument that is not an option or an option's value.
+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 };
+            continue;
+        }
+        return Some(a);
+    }
+    None
+}
+
+fn cmd_run(args: &[String]) -> Result<(), String> {
+    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())?;
+            }
+            (None, Some(p)) => s = load(p)?,
+            _ => {}
+        }
+        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
+    // the wrong part with success, so fail the run unless asked to write it anyway.
+    if !args.iter().any(|a| a == "--allow-errors") {
+        timeline_ok(&s)?;
+    }
+    for out in flags(args, "--out") {
+        s.execute("file.export", &json!({"path": out})).map_err(|e| e.to_string())?;
+    }
+    if let Some(p) = flag(args, "--save") {
+        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") {
+        let m = s.execute("inspect.measure", &json!({})).map_err(|e| e.to_string())?;
+        println!("{}", pretty(&m));
+    }
+    Ok(())
+}
+
+/// Every failing timeline feature, one per line, as an error; Ok when none fails.
+fn timeline_ok(s: &Session) -> Result<(), String> {
+    let failed: Vec<String> = s.model.results.iter().filter_map(|r| r.error.as_ref().map(|e| format!("  {}: {e}", r.name))).collect();
+    if failed.is_empty() {
+        return Ok(());
+    }
+    Err(format!(
+        "{} timeline feature(s) failed, so nothing was written (--allow-errors writes the bodies anyway):\n{}",
+        failed.len(),
+        failed.join("\n")
+    ))
+}
+
+fn cmd_eval(args: &[String]) -> Result<(), String> {
+    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())?;
+    let d = s.execute("document.inspect", &json!({})).map_err(|e| e.to_string())?;
+    let out = json!({
+        "body_count": m["body_count"],
+        "bodies": m["bodies"],
+        "total": m["total"],
+        "timeline": d["timeline"],
+        "params": d["params"],
+        "sketches": d["sketches"],
+    });
+    println!("{}", pretty(&out));
+    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}`"))?);
+    }
+    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()})));
+    Ok(())
+}
+
+/// The app icon: the SolidCraft logo, drawn in code on a transparent background
+/// (so packages need no committed image). `.ico` holds the Windows sizes as PNGs.
+fn cmd_icon(args: &[String]) -> Result<(), String> {
+    let out = flag(args, "--out").ok_or("icon needs --out FILE.png or FILE.ico")?;
+    let size: usize = flag(args, "--size").and_then(|x| x.parse().ok()).unwrap_or(256).clamp(8, 2048);
+    let bytes = if out.to_ascii_lowercase().ends_with(".ico") {
+        let pngs: Vec<(usize, Vec<u8>)> =
+            [16, 20, 24, 32, 40, 48, 64, 128, 256].into_iter().map(|s| icon_png(s).map(|p| (s, p))).collect::<Result<_, _>>()?;
+        ico(&pngs)?
+    } else {
+        icon_png(size)?
+    };
+    std::fs::write(out, &bytes).map_err(|e| format!("{out}: {e}"))?;
+    println!("{}", pretty(&json!({"path": out, "bytes": bytes.len()})));
+    Ok(())
+}
+
+fn icon_png(size: usize) -> Result<Vec<u8>, String> {
+    solidcraft_engine::render::png(size, size, app_icon::rgba(size)?).ok_or_else(|| "icon: PNG encoding failed".to_string())
+}
+
+/// A Windows icon file holding PNG images (Vista and later read these).
+fn ico(images: &[(usize, Vec<u8>)]) -> Result<Vec<u8>, String> {
+    let n = u16::try_from(images.len()).map_err(|_| "too many icon sizes")?;
+    let mut out = Vec::new();
+    out.extend_from_slice(&[0, 0, 1, 0]);
+    out.extend_from_slice(&n.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 };
+        out.extend_from_slice(&[dim, dim, 0, 0, 1, 0, 32, 0]);
+        out.extend_from_slice(&u32::try_from(data.len()).map_err(|_| "icon too large")?.to_le_bytes());
+        out.extend_from_slice(&u32::try_from(offset).map_err(|_| "icon too large")?.to_le_bytes());
+        offset += data.len();
+    }
+    for (_, data) in images {
+        out.extend_from_slice(data);
+    }
+    Ok(out)
+}
+
+fn cmd_exec(args: &[String]) -> Result<(), String> {
+    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}"))?,
+        None => json!({}),
+    };
+    let mut s = Session::default();
+    let v = s.execute(id, &p).map_err(|e| e.to_string())?;
+    println!("{}", pretty(&v));
+    Ok(())
+}
+
+/// 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.
+fn cmd_mcp(args: &[String]) -> Result<(), String> {
+    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()),
+    };
+    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())
+}
+
+/// `save-stress <path> <rounds>`: save a design of a few hundred kilobytes `rounds` times, its
+/// parameter `save_round` set to the round number each time.
+fn cmd_save_stress(args: &[String]) -> Result<(), String> {
+    let (Some(path), Some(rounds)) = (args.first(), args.get(1).and_then(|n| n.parse::<u64>().ok())) else {
+        return Err("usage: solidcraft-cli save-stress <path> <rounds>".into());
+    };
+    let mut s = Session::default();
+    let filler = (0..3000).map(|i| solidcraft_engine::doc::Param {
+        name: format!("p{i}"),
+        expr: format!("{i} mm + 0.5 mm"),
+        unit: "mm".into(),
+        comment: "filler to make the file large".into(),
+        model: false,
+    });
+    s.doc_mut().params.extend(filler);
+    for r in 0..rounds {
+        s.doc_mut().set_param("save_round", &r.to_string(), None, None).map_err(|e| e.to_string())?;
+        s.execute("file.save", &json!({ "path": path })).map_err(|e| e.to_string())?;
+    }
+    Ok(())
+}
+
+/// `bench-edit <script.json|recipe.json> <param> <expr>`: build the design, then time a
+/// parameter edit, setting it back, undo and redo (ms and features recomputed each).
+fn cmd_bench_edit(args: &[String]) -> Result<(), String> {
+    let (Some(path), Some(param), Some(expr)) = (args.first(), args.get(1), args.get(2)) else {
+        return Err("usage: solidcraft-cli bench-edit <script.json|recipe.json> <param> <expr>".into());
+    };
+    let v = read_json(path)?;
+    let script = if v.get("features").is_some() { recipe::to_script(&v)? } else { v };
+    let mut s = Session::default();
+    let t = std::time::Instant::now();
+    s.run_script(&script).map_err(|e| e.to_string())?;
+    let build = t.elapsed().as_secs_f64() * 1000.0;
+    let old = s.doc.all_param_exprs().into_iter().find(|(n, _, _)| n == param).map(|(_, e, _)| e).ok_or(format!("no parameter `{param}`"))?;
+    let mut out = vec![json!({"step": "build", "ms": build, "features": s.doc.features.len()})];
+    let mut time = |s: &mut Session, step: &str, id: &str, p: Value| -> Result<(), String> {
+        let t = std::time::Instant::now();
+        let r = s.execute(id, &p).map_err(|e| format!("{step}: {e}"))?;
+        let n = r.get("recomputed").cloned().unwrap_or_else(|| json!(s.model.last_recomputed));
+        out.push(json!({"step": step, "ms": t.elapsed().as_secs_f64() * 1000.0, "recomputed": n}));
+        Ok(())
+    };
+    let expr = expr.replace("{old}", &old);
+    time(&mut s, "edit", "parameters.change", json!({"name": param, "expression": expr}))?;
+    time(&mut s, "set back", "parameters.change", json!({"name": param, "expression": old}))?;
+    time(&mut s, "undo", "edit.undo", json!({}))?;
+    time(&mut s, "redo", "edit.redo", json!({}))?;
+    println!("{}", pretty(&json!(out)));
+    Ok(())
+}
+
+/// Separate file reading, JSON decoding/repair, timeline evaluation and display meshing.
+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);
+    let limit = if step { solidcraft_engine::io::MAX_STEP_BYTES } else { solidcraft_engine::io::MAX_DESIGN_BYTES };
+    let bytes = solidcraft_engine::io::vfs::read(path, limit).map_err(|e| format!("{path}: {e}"))?;
+    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 {
+        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
+    } else {
+        solidcraft_engine::io::read_design(&bytes).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()}));
+    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}));
+    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 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}));
+    Ok(())
+}

apps/solidcraft-cli/src/oracle.rs

@@ -0,0 +1,263 @@
+//! Reference tests: replay `tests/oracle/<case>/recipe.json` through the command engine and
+//! compare the part with `expected.json` (closed-form values, or values from an independent
+//! kernel; see tests/oracle/README.md), and with `reference.stl` where one exists.
+
+#![allow(clippy::needless_range_loop)]
+
+use serde_json::{Value, json};
+use solidcraft_engine::geom::Vec3;
+
+use crate::spatial::{self, Tri};
+use crate::{read_json, recipe};
+
+/// Default relative tolerance for volume and area (our curved-face tessellation is within ~2e-4).
+pub const REL_TOL: f64 = 1e-3;
+/// Default tolerance for centre of mass and bounding box, as a fraction of the bbox diagonal.
+const ABS_FRAC: f64 = 1e-3;
+/// Chord tolerance used to triangulate our part for the surface-distance check (mm).
+const MESH_TOL: f64 = 0.01;
+/// Relative tolerance on the principal second moments of the two triangulations.
+const INERTIA_REL: f64 = 2e-3;
+
+/// What SolidCraft built: totals over every body.
+struct Got {
+    body_count: usize,
+    volume: f64,
+    area: f64,
+    com: [f64; 3],
+    bbox: ([f64; 3], [f64; 3]),
+    faces: u64,
+}
+
+fn v3(v: &Value) -> Option<[f64; 3]> {
+    let a = v.as_array()?;
+    Some([a.first()?.as_f64()?, a.get(1)?.as_f64()?, a.get(2)?.as_f64()?])
+}
+
+fn totals(m: &Value) -> Got {
+    let bodies = m["bodies"].as_array().cloned().unwrap_or_default();
+    let (mut volume, mut area, mut faces) = (0.0, 0.0, 0);
+    let mut moment = [0.0; 3];
+    let mut lo = [f64::INFINITY; 3];
+    let mut hi = [f64::NEG_INFINITY; 3];
+    for b in &bodies {
+        let v = b["volume_mm3"].as_f64().unwrap_or(f64::NAN);
+        volume += v;
+        area += b["area_mm2"].as_f64().unwrap_or(f64::NAN);
+        faces += b["faces"].as_u64().unwrap_or(0);
+        let c = v3(&b["center_of_mass"]).unwrap_or([f64::NAN; 3]);
+        let (bl, bh) = (v3(&b["bbox"]["min"]).unwrap_or([f64::NAN; 3]), v3(&b["bbox"]["max"]).unwrap_or([f64::NAN; 3]));
+        for k in 0..3 {
+            moment[k] += v * c[k];
+            lo[k] = lo[k].min(bl[k]);
+            hi[k] = hi[k].max(bh[k]);
+        }
+    }
+    let com = moment.map(|x| x / volume);
+    Got { body_count: bodies.len(), volume, area, com, bbox: (lo, hi), faces }
+}
+
+struct Checks {
+    list: Vec<Value>,
+    pass: bool,
+}
+
+impl Checks {
+    fn push(&mut self, what: &str, got: Value, want: Value, ok: bool) {
+        self.pass &= ok;
+        self.list.push(json!({"check": what, "got": got, "want": want, "ok": ok}));
+    }
+    fn rel(&mut self, what: &str, g: f64, w: Option<f64>, rel: f64) {
+        let ok = w.is_some_and(|w| g.is_finite() && (g - w).abs() <= rel * w.abs().max(1.0));
+        self.push(what, json!(g), json!(w), ok);
+    }
+    fn vec(&mut self, what: &str, g: [f64; 3], w: Option<[f64; 3]>, tol: f64) {
+        let ok = w.is_some_and(|w| g.iter().zip(w).all(|(g, w)| g.is_finite() && (g - w).abs() <= tol));
+        self.push(what, json!(g), json!(w), ok);
+    }
+}
+
+fn check_case(dir: &str) -> Value {
+    let name = std::path::Path::new(dir).file_name().map(|x| x.to_string_lossy().to_string()).unwrap_or_default();
+    let recipe = match read_json(&format!("{dir}/recipe.json")) {
+        Ok(r) => r,
+        Err(e) => return json!({"case": name, "pass": false, "error": e}),
+    };
+    let want = read_json(&format!("{dir}/expected.json")).ok();
+    let script = match recipe::to_script(&recipe) {
+        Ok(s) => s,
+        Err(e) => return json!({"case": name, "pass": false, "skipped": true, "error": e}),
+    };
+    let mut s = solidcraft_engine::Session::default();
+    if let Err(e) = s.run_script(&script) {
+        return json!({"case": name, "pass": false, "error": e.to_string(), "source": want.as_ref().map(|w| w["source"].clone())});
+    }
+    let got = match s.execute("inspect.measure", &json!({})) {
+        Ok(m) => totals(&m),
+        Err(e) => return json!({"case": name, "pass": false, "error": e.to_string()}),
+    };
+    let got_json = json!({
+        "body_count": got.body_count, "volume_mm3": got.volume, "area_mm2": got.area,
+        "center_of_mass": got.com, "bbox": {"min": got.bbox.0, "max": got.bbox.1}, "faces": got.faces,
+    });
+    let Some(want) = want else {
+        return json!({"case": name, "pass": false, "skipped": true, "error": "no expected.json yet", "got": got_json});
+    };
+    let only: Option<Vec<String>> = want["compare"].as_array().map(|a| a.iter().filter_map(|x| x.as_str().map(str::to_string)).collect());
+    let wanted = |k: &str| want.get(k).is_some_and(|v| !v.is_null()) && only.as_ref().is_none_or(|o| o.iter().any(|x| x == k));
+    let rel = want["tolerance"]["rel"].as_f64().unwrap_or(REL_TOL);
+    let diag = |b: ([f64; 3], [f64; 3])| ((b.1[0] - b.0[0]).powi(2) + (b.1[1] - b.0[1]).powi(2) + (b.1[2] - b.0[2]).powi(2)).sqrt();
+    let want_bbox = v3(&want["bbox"]["min"]).zip(v3(&want["bbox"]["max"]));
+    let abs = want["tolerance"]["abs_mm"].as_f64().unwrap_or_else(|| ABS_FRAC * want_bbox.map(diag).unwrap_or_else(|| diag(got.bbox)).max(1.0));
+    let mut c = Checks { list: Vec::new(), pass: true };
+    if wanted("body_count") {
+        let ok = want["body_count"].as_u64() == Some(got.body_count as u64);
+        c.push("body_count", json!(got.body_count), want["body_count"].clone(), ok);
+    }
+    if wanted("volume_mm3") {
+        c.rel("volume_mm3", got.volume, want["volume_mm3"].as_f64(), rel);
+    }
+    if wanted("area_mm2") {
+        c.rel("area_mm2", got.area, want["area_mm2"].as_f64(), rel);
+    }
+    if wanted("center_of_mass") {
+        c.vec("center_of_mass", got.com, v3(&want["center_of_mass"]), abs);
+    }
+    if wanted("bbox") {
+        c.vec("bbox.min", got.bbox.0, want_bbox.map(|b| b.0), abs);
+        c.vec("bbox.max", got.bbox.1, want_bbox.map(|b| b.1), abs);
+    }
+    if wanted("faces") {
+        let ok = want["faces"].as_u64() == Some(got.faces);
+        c.push("faces", json!(got.faces), want["faces"].clone(), ok);
+    }
+    let stl = format!("{dir}/reference.stl");
+    if std::path::Path::new(&stl).is_file() && only.as_ref().is_none_or(|o| o.iter().any(|x| x == "surface")) {
+        let tol = want["tolerance"]["surface_mm"].as_f64().unwrap_or(0.05);
+        reference_checks(&s, &stl, tol, &mut c);
+    }
+    // Our STEP export of the rebuilt part: well formed, and read back with no warnings and the
+    // same volume.
+    let (ok, note) = step_export_check(&s, got.volume);
+    c.push("step_export", json!(note), json!("valid, re-imports cleanly"), ok);
+    let mut out = json!({"case": name, "pass": c.pass, "source": want["source"], "checks": c.list, "got": got_json});
+    if let Some(n) = want["note"].as_str() {
+        out["note"] = json!(n);
+    }
+    out
+}
+
+/// Export the session's bodies as STEP, validate the file and import it again.
+fn step_export_check(s: &solidcraft_engine::Session, volume: f64) -> (bool, String) {
+    let st = s.model.state();
+    let bytes = match solidcraft_engine::io::export(&st, &[], solidcraft_engine::io::Format::Step, "oracle") {
+        Ok(b) => b,
+        Err(e) => return (false, format!("export: {e}")),
+    };
+    let text = String::from_utf8_lossy(&bytes);
+    if let Err(e) = solidcraft_engine::kernel::step_validate(&text) {
+        return (false, format!("invalid: {e}"));
+    }
+    match solidcraft_engine::kernel::step_orientation_errors(&text) {
+        Ok(errs) if !errs.is_empty() => return (false, format!("faces inside out: {}", errs.join("; "))),
+        Err(e) => return (false, format!("orientation check: {e}")),
+        Ok(_) => {}
+    }
+    match solidcraft_engine::kernel::step_import(&text) {
+        Ok(imp) if !imp.warnings.is_empty() => (false, format!("warnings: {}", imp.warnings.join("; "))),
+        Ok(imp) if imp.bodies.len() != st.bodies.len() => (false, format!("{} bodies back of {}", imp.bodies.len(), st.bodies.len())),
+        Ok(imp) => {
+            let m: Vec<_> = imp.bodies.iter().filter_map(|b| solidcraft_engine::kernel::measure(&b.body).ok()).collect();
+            let m0: Vec<_> = st.bodies.iter().filter_map(|b| solidcraft_engine::kernel::measure(&b.body).ok()).collect();
+            let v: f64 = m.iter().map(|x| x.volume).sum();
+            let (a, a0): (f64, f64) = (m.iter().map(|x| x.area).sum(), m0.iter().map(|x| x.area).sum());
+            let faces: usize = imp.bodies.iter().map(|b| b.file_faces).sum();
+            let faces0: usize = m0.iter().map(|x| x.merged.faces).sum();
+            let close = |x: f64, y: f64| (x - y).abs() <= REL_TOL * y.abs().max(1.0);
+            let faces_raw: usize = st.bodies.iter().map(|b| b.body.face_count()).sum();
+            // (Fewer is fine: pieces of one plane, cylinder, cone, sphere or torus are written as one face.)
+            let ok = close(v, volume) && close(a, a0) && faces <= faces_raw;
+            (ok, format!("re-imported volume {v:.3} (was {volume:.3}), area {a:.3} (was {a0:.3}), faces {faces} (was {faces0})"))
+        }
+        Err(e) => (false, format!("import: {e}")),
+    }
+}
+
+/// Our part as a triangle soup (curved faces refined onto the surface).
+fn our_mesh(s: &solidcraft_engine::Session) -> Result<Vec<Tri>, String> {
+    let mut ours: Vec<Tri> = Vec::new();
+    for b in &s.world_state().bodies {
+        let m = b.body.tessellate_with(MESH_TOL, true).map_err(|e| e.to_string())?;
+        let p = |i: u32| m.positions.get(i as usize).map(|v: &Vec3| [v.x, v.y, v.z]);
+        for t in &m.triangles {
+            if let (Some(a), Some(b), Some(c)) = (p(t[0]), p(t[1]), p(t[2])) {
+                ours.push([a, b, c]);
+            }
+        }
+    }
+    if ours.is_empty() { Err("empty mesh".into()) } else { Ok(ours) }
+}
+
+/// Compare our part with the reference triangulation: the symmetric surface distance, and the
+/// principal second moments of volume of both meshes (the shape's inertia, independent of how it
+/// sits in space).
+fn reference_checks(s: &solidcraft_engine::Session, stl: &str, tol: f64, c: &mut Checks) {
+    let (ours, reference) = match (our_mesh(s), spatial::read_stl(stl)) {
+        (Ok(o), Ok(r)) if !r.is_empty() => (o, r),
+        (Err(e), _) | (_, Err(e)) => return c.push("surface_distance_mm", json!(e), json!(format!("<= {tol}")), false),
+        _ => return c.push("surface_distance_mm", json!("empty reference.stl"), json!(format!("<= {tol}")), false),
+    };
+    let (lo, hi) = spatial::bounds(&reference);
+    let size = (0..3).map(|k| hi[k] - lo[k]).fold(0.0, f64::max);
+    let h = spatial::hausdorff(&ours, &reference, size.max(1.0));
+    let worst = h.a_to_b.max(h.b_to_a);
+    c.push(
+        "surface_distance_mm",
+        json!({"max": worst, "mean": h.mean, "ours_to_reference": h.a_to_b, "reference_to_ours": h.b_to_a, "worst_at": h.worst_at}),
+        json!(format!("<= {tol}")),
+        worst <= tol,
+    );
+    let ((_, _, pa), (_, _, pb)) = (spatial::mass_properties(&ours), spatial::mass_properties(&reference));
+    let ok = pa.iter().zip(pb).all(|(a, b)| (a - b).abs() <= INERTIA_REL * b.abs().max(1.0));
+    c.push("principal_moments_mm5", json!(pa), json!(pb), ok);
+}
+
+fn report(args: &[String], results: &[Value]) {
+    if args.iter().any(|a| a == "--json") {
+        println!("{}", serde_json::to_string_pretty(&Value::Array(results.to_vec())).unwrap_or_default());
+        return;
+    }
+    for r in results {
+        let status = if r["pass"].as_bool().unwrap_or(false) {
+            "PASS"
+        } else if r["skipped"].as_bool().unwrap_or(false) {
+            "SKIP"
+        } else {
+            "FAIL"
+        };
+        let detail: 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();
+        let err = r["error"].as_str().map(|e| format!(" ({e})")).unwrap_or_default();
+        println!(
+            "{status} {}{err}{}",
+            r["case"].as_str().unwrap_or(""),
+            if detail.is_empty() { String::new() } else { format!(": {}", detail.join("; ")) }
+        );
+    }
+}
+
+pub fn run(args: &[String]) -> Result<(), String> {
+    let dirs: Vec<&String> = args.iter().filter(|a| !a.starts_with("--")).collect();
+    if dirs.is_empty() {
+        return Err("oracle: give one or more case directories (each with recipe.json and expected.json)".into());
+    }
+    let results: Vec<Value> = dirs.iter().map(|d| check_case(d)).collect();
+    report(args, &results);
+    let failed = results.iter().filter(|r| !r["pass"].as_bool().unwrap_or(false) && !r["skipped"].as_bool().unwrap_or(false)).count();
+    if failed > 0 { Err(format!("{failed} oracle case(s) failed")) } else { Ok(()) }
+}

apps/solidcraft-cli/src/recipe.rs

@@ -0,0 +1,560 @@
+//! Reference-test recipes (`tests/oracle/*/recipe.json`) → SolidCraft command scripts.
+//!
+//! A recipe lists features with sketch entities in sketch-local coordinates; point references
+//! (`l1.end`) share points. Each feature becomes one or more commands.
+
+use serde_json::{Value, json};
+
+fn plane_param(pl: &Value) -> Value {
+    let r = pl.get("ref").and_then(Value::as_str).unwrap_or("");
+    let origin_zero = pl.get("origin").and_then(Value::as_array).is_none_or(|o| o.iter().all(|x| x.as_f64().unwrap_or(0.0).abs() < 1e-12));
+    let std = match r.to_ascii_uppercase().as_str() {
+        "XY" => Some(([1.0, 0.0, 0.0], [0.0, 1.0, 0.0])),
+        "XZ" => Some(([1.0, 0.0, 0.0], [0.0, 0.0, -1.0])),
+        "YZ" => Some(([0.0, 1.0, 0.0], [0.0, 0.0, 1.0])),
+        _ => None,
+    };
+    let axes_match = |k: &str, want: [f64; 3]| {
+        pl.get(k).and_then(Value::as_array).is_some_and(|a| a.iter().zip(want).all(|(x, w)| (x.as_f64().unwrap_or(f64::NAN) - w).abs() < 1e-9))
+    };
+    match std {
+        Some((x, y)) if origin_zero && axes_match("x_dir", x) && axes_match("y_dir", y) => json!(r.to_ascii_uppercase()),
+        _ => json!({"origin": pl.get("origin").cloned().unwrap_or(json!([0, 0, 0])), "x_dir": pl.get("x_dir"), "y_dir": pl.get("y_dir")}),
+    }
+}
+
+/// A point argument: the shared reference if any, else the coordinates.
+fn parg(p: Option<&Value>) -> Value {
+    match p {
+        Some(v) => match (v.get("ref"), v.get("at")) {
+            (Some(Value::String(r)), _) => json!(r),
+            (_, Some(at)) => at.clone(),
+            _ => v.clone(),
+        },
+        None => Value::Null,
+    }
+}
+
+fn op(f: &Value) -> Value {
+    f.get("operation").cloned().unwrap_or(json!("new"))
+}
+
+fn sketch_cmds(f: &Value, out: &mut Vec<Value>) -> Result<(), String> {
+    let mut p = json!({"plane": plane_param(f.get("plane").unwrap_or(&Value::Null))});
+    if let Some(n) = f.get("name") {
+        p["name"] = n.clone();
+    }
+    out.push(json!({"command": "sketch.create", "params": p}));
+    for e in f.get("entities").and_then(Value::as_array).into_iter().flatten() {
+        let id = e.get("id").cloned().unwrap_or(Value::Null);
+        let construction = e.get("construction").cloned().unwrap_or(json!(false));
+        match e.get("type").and_then(Value::as_str) {
+            Some("line") => out.push(json!({"command": "sketch.line", "params": {"points": [parg(e.get("start")), parg(e.get("end"))], "ids": [id], "construction": construction}})),
+            Some("circle") => out.push(json!({"command": "sketch.circle.center", "params": {"center": parg(e.get("center")), "radius": e.get("radius"), "id": id, "construction": construction}})),
+            Some("arc_three_point") => out.push(json!({"command": "sketch.arc.three_point", "params": {"start": parg(e.get("start")), "end": parg(e.get("end")), "through": e.get("mid").or(e.get("through")), "id": id}})),
+            Some("arc_center_start_sweep") => out.push(json!({"command": "sketch.arc.center_point", "params": {"center": parg(e.get("center")), "start": parg(e.get("start")), "sweep": e.get("sweep_deg").or(e.get("sweep")), "id": id}})),
+            Some("arc") => {
+                if e.get("center").is_some() {
+                    out.push(json!({"command": "sketch.arc.center_point", "params": {"center": parg(e.get("center")), "start": parg(e.get("start")), "end": parg(e.get("end")), "id": id}}))
+                } else {
+                    out.push(json!({"command": "sketch.arc.three_point", "params": {"start": parg(e.get("start")), "end": parg(e.get("end")), "through": parg(e.get("through").or(e.get("mid"))), "id": id}}))
+                }
+            }
+            Some("point") => out.push(json!({"command": "sketch.point", "params": {"point": parg(e.get("at").map(|a| json!({"at": a})).as_ref().or(Some(e))), "id": id}})),
+            // A 3D helix fit: the sweep along it becomes a coil (see `helix_path`).
+            Some("fitted_spline") if e.get("fit_points").and_then(Value::as_array).is_some_and(|a| a.iter().any(|p| p.get(2).is_some())) => {}
+            Some(other) => return Err(format!("recipe: sketch entity type `{other}` is not supported yet")),
+            None => return Err("recipe: sketch entity without type".into()),
+        }
+    }
+    for c in f.get("constraints").and_then(Value::as_array).into_iter().flatten() {
+        out.push(constraint_cmd(c)?);
+    }
+    for d in f.get("dimensions").and_then(Value::as_array).into_iter().flatten() {
+        let mut p = json!({"entities": d.get("refs").or(d.get("entities")), "type": d.get("type"), "value": d.get("value")});
+        for k in ["orientation", "text_at"] {
+            if let Some(v) = d.get(k) {
+                p[k] = v.clone();
+            }
+        }
+        out.push(json!({"command": "sketch.dimension", "params": p}));
+    }
+    out.push(json!({"command": "sketch.finish", "params": {}}));
+    Ok(())
+}
+
+/// Extent parameters for the Extrude command.
+fn extent(f: &Value, p: &mut Value) {
+    let e = f.get("extent").cloned().unwrap_or(Value::Null);
+    let ty = e.get("type").and_then(Value::as_str).unwrap_or("distance");
+    let dist = e.get("distance").cloned().or_else(|| f.get("distance").cloned()).unwrap_or(Value::Null);
+    match ty {
+        "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 };
+        }
+        "two_sides" => {
+            p["distance"] = e.get("side1").cloned().unwrap_or(Value::Null);
+            p["distance2"] = e.get("side2_opposite").or(e.get("side2")).cloned().unwrap_or(Value::Null);
+        }
+        "through_all" => {
+            p["through_all"] = json!(true);
+            p["direction"] = e.get("direction").cloned().unwrap_or(json!("positive"));
+        }
+        _ => {
+            p["distance"] = dist;
+            p["direction"] = e.get("direction").cloned().unwrap_or(json!("positive"));
+        }
+    }
+    if let Some(t) = e.get("taper_deg") {
+        p["taper"] = t.clone();
+    }
+}
+
+fn expr_text(v: &Value) -> String {
+    match v {
+        Value::String(s) => s.clone(),
+        other => other.to_string(),
+    }
+}
+
+fn refs(c: &Value) -> Vec<Value> {
+    c.get("refs").and_then(Value::as_array).cloned().unwrap_or_default()
+}
+
+/// A recipe constraint `{type, refs}` → a constraint command.
+fn constraint_cmd(c: &Value) -> Result<Value, String> {
+    let ty = c.get("type").and_then(Value::as_str).unwrap_or("").to_ascii_lowercase();
+    let r = refs(c);
+    let at = |i: usize| r.get(i).cloned().unwrap_or(Value::Null);
+    let is_point = |v: &Value| v.as_str().is_some_and(|s| s.contains('.') || s == "origin" || s.starts_with('p'));
+    let (cmd, p) = match ty.as_str() {
+        "horizontal" | "vertical" if r.len() >= 2 => ("sketch.constraint.horizontal_vertical", json!({"points": [at(0), at(1)], "mode": ty})),
+        "horizontal" | "vertical" => ("sketch.constraint.horizontal_vertical", json!({"line": at(0), "mode": ty})),
+        "horizontal_points" => ("sketch.constraint.horizontal_vertical", json!({"points": [at(0), at(1)], "mode": "horizontal"})),
+        "vertical_points" => ("sketch.constraint.horizontal_vertical", json!({"points": [at(0), at(1)], "mode": "vertical"})),
+        "coincident" | "point_on_curve" => {
+            // The point goes first.
+            if is_point(&at(0)) {
+                ("sketch.constraint.coincident", json!({"a": at(0), "b": at(1)}))
+            } else {
+                ("sketch.constraint.coincident", json!({"a": at(1), "b": at(0)}))
+            }
+        }
+        "midpoint" => {
+            if is_point(&at(0)) {
+                ("sketch.constraint.midpoint", json!({"point": at(0), "line": at(1)}))
+            } else {
+                ("sketch.constraint.midpoint", json!({"point": at(1), "line": at(0)}))
+            }
+        }
+        "symmetric" | "symmetry" => ("sketch.constraint.symmetry", json!({"a": at(0), "b": at(1), "line": at(2)})),
+        "fix" => ("sketch.constraint.fix", json!({"entity": at(0), "fixed": true})),
+        "tangent" => ("sketch.constraint.tangent", json!({"a": at(0), "b": at(1)})),
+        "equal" => ("sketch.constraint.equal", json!({"a": at(0), "b": at(1)})),
+        "parallel" => ("sketch.constraint.parallel", json!({"a": at(0), "b": at(1)})),
+        "perpendicular" => ("sketch.constraint.perpendicular", json!({"a": at(0), "b": at(1)})),
+        "concentric" => ("sketch.constraint.concentric", json!({"a": at(0), "b": at(1)})),
+        "collinear" => ("sketch.constraint.collinear", json!({"a": at(0), "b": at(1)})),
+        other => return Err(format!("recipe: constraint `{other}` is not supported yet")),
+    };
+    Ok(json!({"command": cmd, "params": p}))
+}
+
+/// The profiles a feature uses (`profiles` list or a single `profile`).
+fn profiles_of(f: &Value) -> Value {
+    match (f.get("profiles"), f.get("profile")) {
+        (Some(p), _) => p.clone(),
+        (None, Some(p)) => json!([p]),
+        _ => json!("all"),
+    }
+}
+
+/// The sketch a feature uses (name), from its profiles.
+fn profile_sketch(f: &Value) -> Value {
+    profiles_of(f)
+        .as_array()
+        .and_then(|a| a.first())
+        .and_then(|p| p.get("sketch"))
+        .cloned()
+        .or_else(|| f.get("sketch").cloned())
+        .unwrap_or(Value::Null)
+}
+
+fn sketch_entity<'a>(features: &'a [Value], sketch: &Value, id: &Value) -> Option<&'a Value> {
+    features
+        .iter()
+        .find(|x| x.get("op").and_then(Value::as_str) == Some("sketch") && x.get("name") == Some(sketch))?
+        .get("entities")?
+        .as_array()?
+        .iter()
+        .find(|e| e.get("id") == Some(id))
+}
+
+/// A sweep of a circle along a fitted 3D spline that is a helix about a Z-parallel axis:
+/// (base, diameter, pitch, turns, start angle, clockwise, section size).
+#[allow(clippy::type_complexity)]
+fn helix_path(features: &[Value], f: &Value) -> Option<([f64; 3], f64, f64, f64, f64, bool, f64)> {
+    let path = f.get("path")?;
+    let curve = sketch_entity(features, path.get("sketch")?, path.get("curves")?.as_array()?.first()?)?;
+    if curve.get("type")?.as_str()? != "fitted_spline" {
+        return None;
+    }
+    let pts: Vec<[f64; 3]> = curve
+        .get("fit_points")?
+        .as_array()?
+        .iter()
+        .filter_map(|p| {
+            let a = p.as_array()?;
+            Some([a.first()?.as_f64()?, a.get(1)?.as_f64()?, a.get(2)?.as_f64()?])
+        })
+        .collect();
+    if pts.len() < 8 {
+        return None;
+    }
+    let n = pts.len() as f64;
+    let (cx, cy) = circle_fit(&pts)?;
+    let r: Vec<f64> = pts.iter().map(|p| (p[0] - cx).hypot(p[1] - cy)).collect();
+    let rm = r.iter().sum::<f64>() / n;
+    if rm <= 0.0 || r.iter().any(|x| (x - rm).abs() > 1e-3 * rm) {
+        return None;
+    }
+    // Unwrapped angle and height: both linear along a helix.
+    let mut total = 0.0;
+    let mut prev = (pts[0][1] - cy).atan2(pts[0][0] - cx);
+    let start = prev;
+    for p in pts.iter().skip(1) {
+        let a = (p[1] - cy).atan2(p[0] - cx);
+        let mut d = a - prev;
+        while d > std::f64::consts::PI {
+            d -= std::f64::consts::TAU;
+        }
+        while d < -std::f64::consts::PI {
+            d += std::f64::consts::TAU;
+        }
+        total += d;
+        prev = a;
+    }
+    let turns = total.abs() / std::f64::consts::TAU;
+    let rise = pts.last()?[2] - pts[0][2];
+    if turns < 1e-6 || rise.abs() < 1e-9 {
+        return None;
+    }
+    // The section: a circle in the profile sketch.
+    let prof = f.get("profile").or_else(|| f.get("profiles").and_then(|x| x.get(0)))?;
+    let loop0 = prof.get("loops")?.get(0)?.get("curves")?.get(0)?;
+    let circle = sketch_entity(features, prof.get("sketch")?, loop0)?;
+    let size = 2.0 * circle.get("radius")?.as_f64()?;
+    Some(([cx, cy, pts[0][2]], 2.0 * rm, rise.abs() / turns, turns, start, (total < 0.0) != (rise < 0.0), size))
+}
+
+/// Least-squares circle through the points' (x, y): x² + y² + D x + E y + F = 0 (Kåsa).
+#[allow(clippy::needless_range_loop)]
+fn circle_fit(pts: &[[f64; 3]]) -> Option<(f64, f64)> {
+    let mut m = [[0.0f64; 4]; 3];
+    for p in pts {
+        let row = [p[0], p[1], 1.0];
+        let rhs = -(p[0] * p[0] + p[1] * p[1]);
+        for i in 0..3 {
+            for j in 0..3 {
+                m[i][j] += row[i] * row[j];
+            }
+            m[i][3] += row[i] * rhs;
+        }
+    }
+    // Gauss-Jordan on the 3x4 normal equations.
+    for c in 0..3 {
+        let piv = (c..3).max_by(|a, b| m[*a][c].abs().total_cmp(&m[*b][c].abs()))?;
+        m.swap(c, piv);
+        if m[c][c].abs() < 1e-12 {
+            return None;
+        }
+        for r in 0..3 {
+            if r != c {
+                let f = m[r][c] / m[c][c];
+                for k in c..4 {
+                    m[r][k] -= f * m[c][k];
+                }
+            }
+        }
+    }
+    let (d, e) = (m[0][3] / m[0][0], m[1][3] / m[1][1]);
+    Some((-d / 2.0, -e / 2.0))
+}
+
+pub fn to_script(recipe: &Value) -> Result<Value, String> {
+    let mut out: Vec<Value> = Vec::new();
+    for p in recipe.get("parameters").and_then(Value::as_array).into_iter().flatten() {
+        out.push(json!({"command": "parameters.change", "params": {"name": p.get("name"), "expression": p.get("expression").or(p.get("value")), "unit": p.get("unit").cloned().unwrap_or(json!("mm"))}}));
+    }
+    let features = recipe.get("features").and_then(Value::as_array).ok_or("recipe: missing `features`")?;
+    for f in features {
+        let name = f.get("name").cloned().unwrap_or(Value::Null);
+        let bodies = f.get("result_bodies").cloned().unwrap_or(json!([]));
+        match f.get("op").and_then(Value::as_str) {
+            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});
+                extent(f, &mut p);
+                out.push(json!({"command": "solid.extrude", "params": p}));
+            }
+            Some("combine") => out.push(json!({"command": "solid.combine", "params": {
+                "target": f.get("target_body").or(f.get("target")), "tools": f.get("tool_bodies").or(f.get("tools")),
+                "operation": op(f), "keep_tools": f.get("keep_tools").cloned().unwrap_or(json!(false)), "name": name}})),
+            Some("revolve") => {
+                let axis = match f.get("axis") {
+                    Some(a) if a.get("dir").is_some() => json!({"origin": a.get("origin").cloned().unwrap_or(json!([0, 0, 0])), "dir": a.get("dir")}),
+                    Some(a) => a.get("line").or(a.get("ref")).cloned().unwrap_or_else(|| a.clone()),
+                    None => Value::Null,
+                };
+                out.push(json!({"command": "solid.revolve", "params": {
+                    "sketch": profile_sketch(f), "profiles": profiles_of(f), "axis": axis,
+                    "angle": f.get("angle").cloned().unwrap_or(json!("360 deg")), "operation": op(f), "name": name, "body_names": bodies}}));
+            }
+            Some("rectangular_pattern") => {
+                let d1 = f.get("direction1").cloned().unwrap_or(Value::Null);
+                let d2 = f.get("direction2").cloned().unwrap_or(Value::Null);
+                let mut p = json!({"features": feature_refs(f.get("features")), "dir1": d1.get("axis"), "count1": d1.get("count"), "spacing1": d1.get("spacing"), "name": name});
+                if !d2.is_null() {
+                    p["dir2"] = d2.get("axis").cloned().unwrap_or(Value::Null);
+                    p["count2"] = d2.get("count").cloned().unwrap_or(Value::Null);
+                    p["spacing2"] = d2.get("spacing").cloned().unwrap_or(Value::Null);
+                }
+                out.push(json!({"command": "solid.pattern.rectangular", "params": p}));
+            }
+            Some("circular_pattern") => {
+                let axis = f.get("axis").map(|a| json!({"origin": a.get("origin").cloned().unwrap_or(json!([0, 0, 0])), "dir": a.get("dir")})).unwrap_or(Value::Null);
+                out.push(json!({"command": "solid.pattern.circular", "params": {"features": feature_refs(f.get("features")), "axis": axis, "count": f.get("count"), "angle": f.get("total_angle").cloned().unwrap_or(json!(360)), "name": name}}));
+            }
+            Some("sm_flange") => match f.get("type").and_then(Value::as_str) {
+                Some("edge") => {
+                    let mut p = json!({"type": "edge", "edges": edge_points(f), "height": f.get("height"), "name": name});
+                    if let Some(a) = f.get("angle") {
+                        p["angle"] = a.clone();
+                    }
+                    if f.get("flip").and_then(Value::as_bool) == Some(true) {
+                        p["flip"] = json!(true);
+                    }
+                    out.push(json!({"command": "sheet.flange", "params": p}));
+                }
+                Some("contour") => out.push(json!({"command": "sheet.flange", "params": {
+                    "type": "contour", "sketch": f.get("profile_sketch"), "curves": f.get("profile_curves"), "distance": f.get("distance"), "name": name}})),
+                _ => out.push(json!({"command": "sheet.flange", "params": {
+                    "type": "base", "sketch": profile_sketch(f), "profiles": profiles_of(f), "name": name, "body_names": bodies}})),
+            },
+            Some("sheet_metal_rule_edit") => {
+                let rule = f.get("rule").cloned().unwrap_or(json!("Steel (mm)"));
+                let mut p = json!({"name": rule});
+                if let Some(set) = f.get("set") {
+                    for (from, to) in [("thickness", "thickness"), ("kFactor", "k_factor"), ("bendRadius", "bend_radius")] {
+                        if let Some(v) = set.get(from) {
+                            p[to] = v.clone();
+                        }
+                    }
+                }
+                // "thickness 3 mm (final state…)": the last step of a sequence.
+                if let Some(last) = f.get("sequence").and_then(Value::as_array).and_then(|a| a.last()).and_then(Value::as_str) {
+                    let w: Vec<&str> = last.split_whitespace().collect();
+                    if let (Some(&"thickness"), Some(v), Some(u)) = (w.first(), w.get(1), w.get(2)) {
+                        p["thickness"] = json!(format!("{v} {u}"));
+                    }
+                }
+                out.push(json!({"command": "sheet.manage_rules", "params": p}));
+            }
+            Some("sm_hem") => {
+                let e = f.get("edge").and_then(|e| e.get("point")).cloned().unwrap_or(Value::Null);
+                let mut p = json!({"edges": [e], "length": f.get("length"), "name": name});
+                if f.get("flipped").and_then(Value::as_bool) == Some(true) {
+                    p["flip"] = json!(true);
+                }
+                out.push(json!({"command": "sheet.hem", "params": p}));
+            }
+            Some("sm_unfold") => out.push(json!({"command": "sheet.unfold", "params": {"name": name}})),
+            Some("sm_refold") => out.push(json!({"command": "sheet.refold", "params": {"name": name}})),
+            Some("path_pattern") => {
+                let path = f.get("path").cloned().unwrap_or(Value::Null);
+                let mut p = json!({"path_sketch": path.get("sketch"), "path": path.get("curves"), "count": f.get("count"), "name": name});
+                match f.get("spacing") {
+                    Some(sp) => p["spacing"] = sp.clone(),
+                    None => p["distance"] = f.get("distance").cloned().unwrap_or(Value::Null),
+                }
+                if f.get("pattern_of").and_then(Value::as_str) == Some("bodies") {
+                    p["bodies"] = f.get("bodies").cloned().unwrap_or(Value::Null);
+                } else {
+                    p["features"] = feature_refs(f.get("features"));
+                }
+                out.push(json!({"command": "solid.pattern.path", "params": p}));
+            }
+            Some("loft") => {
+                let sections: Vec<Value> = f
+                    .get("sections")
+                    .and_then(Value::as_array)
+                    .into_iter()
+                    .flatten()
+                    .map(|sec| match sec.get("point") {
+                        Some(pt) => json!({"sketch": sec.get("sketch"), "point": pt}),
+                        None => json!({"sketch": sec.get("sketch"), "profiles": [sec]}),
+                    })
+                    .collect();
+                out.push(json!({"command": "solid.loft", "params": {"sections": sections, "operation": op(f), "name": name, "body_names": bodies}}));
+            }
+            Some("sweep") if helix_path(features, f).is_some() => {
+                // A swept circle along a fitted 3D helix: a coil (the true helix).
+                let Some((base, diameter, pitch, turns, start, cw, size)) = helix_path(features, f) else { continue };
+                out.push(json!({"command": "solid.coil", "params": {
+                    "base": base, "diameter": diameter, "pitch": pitch, "revolutions": turns, "section_size": size,
+                    "start_angle": format!("{start} rad"), "clockwise": cw, "operation": op(f), "name": name, "body_names": bodies}}));
+            }
+            Some("sweep") => {
+                let path = f.get("path").cloned().unwrap_or(Value::Null);
+                out.push(json!({"command": "solid.sweep", "params": {
+                    "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}}));
+            }
+            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}}));
+            }
+            Some("draft") => {
+                let faces: Vec<Value> = f.get("faces").and_then(Value::as_array).into_iter().flatten().filter_map(|x| x.get("point").cloned()).collect();
+                let np = f.get("neutral_plane").cloned().unwrap_or(Value::Null);
+                let n = np.get("plane_normal_outward").or(np.get("normal_at_point_on_face")).cloned().unwrap_or(json!([0, 0, 1]));
+                let neutral = json!({"origin": np.get("point").or(np.get("centroid")).cloned().unwrap_or(json!([0, 0, 0])), "normal": n.clone()});
+                let mut angle = f.get("angle").and_then(Value::as_f64).unwrap_or(0.0);
+                if f.get("flipped").and_then(Value::as_bool).unwrap_or(false) {
+                    angle = -angle;
+                }
+                out.push(json!({"command": "solid.draft", "params": {"faces": faces, "angle": angle, "neutral": neutral, "pull": n, "name": name}}));
+            }
+            Some("thread") => {
+                let face = f.get("face").and_then(|x| x.get("point")).cloned().unwrap_or(Value::Null);
+                let mut p = json!({"face": face, "designation": f.get("designation"), "name": name});
+                if f.get("full_length").and_then(Value::as_bool) == Some(false)
+                    && let Some(l) = f.get("length")
+                {
+                    p["length"] = l.clone();
+                }
+                out.push(json!({"command": "solid.thread", "params": p}));
+            }
+            Some("hole") => {
+                let n = f.get("face").and_then(|fc| fc.get("plane_normal_outward").or(fc.get("normal_at_point_on_face"))).cloned();
+                let mut dir = n.and_then(|n| n.as_array().map(|a| a.iter().map(|x| -x.as_f64().unwrap_or(0.0)).collect::<Vec<f64>>()));
+                // On a cylinder the normal given is at the face's sample point: drill toward the axis.
+                let v3 = |v: Option<&Value>| -> Option<[f64; 3]> {
+                    let a = v?.as_array()?;
+                    Some([a.first()?.as_f64()?, a.get(1)?.as_f64()?, a.get(2)?.as_f64()?])
+                };
+                if let Some(fc) = f.get("face").filter(|fc| fc.get("type").and_then(Value::as_str) == Some("cylinder"))
+                    && let (Some(o), Some(ax), Some(p)) = (v3(fc.get("axis_origin")), v3(fc.get("axis")), v3(f.get("position")))
+                {
+                    let d = [p[0] - o[0], p[1] - o[1], p[2] - o[2]];
+                    let t = d[0] * ax[0] + d[1] * ax[1] + d[2] * ax[2];
+                    let r = [d[0] - t * ax[0], d[1] - t * ax[1], d[2] - t * ax[2]];
+                    let l = (r[0] * r[0] + r[1] * r[1] + r[2] * r[2]).sqrt();
+                    if l > 1e-9 {
+                        dir = Some(vec![-r[0] / l, -r[1] / l, -r[2] / l]);
+                    }
+                }
+                let ty = f.get("hole_type").and_then(Value::as_str).unwrap_or("simple");
+                let mut p = json!({"position": f.get("position"), "diameter": f.get("diameter"), "type": ty, "name": name});
+                // "sketch HolePoints points p1..p6"
+                if let Some(src) = f.get("positions_from").and_then(Value::as_str) {
+                    let w: Vec<&str> = src.split_whitespace().collect();
+                    if let (Some(sk), Some(range)) = (w.iter().position(|x| *x == "sketch").and_then(|i| w.get(i + 1)), w.iter().position(|x| *x == "points").and_then(|i| w.get(i + 1))) {
+                        let ids: Vec<String> = match range.split_once("..") {
+                            Some((a, b)) => {
+                                let pre: String = a.chars().take_while(|c| !c.is_ascii_digit()).collect();
+                                let (lo, hi) = (a[pre.len()..].parse::<u32>().unwrap_or(1), b.trim_start_matches(pre.as_str()).parse::<u32>().unwrap_or(0));
+                                (lo..=hi).map(|k| format!("{pre}{k}")).collect()
+                            }
+                            None => range.split(',').map(str::to_string).collect(),
+                        };
+                        p = json!({"sketch": sk, "points": ids, "diameter": f.get("diameter"), "type": ty, "name": name});
+                    }
+                }
+                if let Some(d) = dir {
+                    p["direction"] = json!(d);
+                }
+                if f.get("extent").and_then(Value::as_str) != Some("through_all") {
+                    p["depth"] = f.get("depth").cloned().unwrap_or(Value::Null);
+                    if let Some(t) = f.get("tip_angle") {
+                        p["tip_angle"] = t.clone();
+                    }
+                }
+                for (k, src) in [("cb_diameter", "counterbore_diameter"), ("cb_depth", "counterbore_depth"), ("cs_diameter", "countersink_diameter"), ("cs_angle", "countersink_angle")] {
+                    if let Some(v) = f.get(src) {
+                        p[k] = v.clone();
+                    }
+                }
+                out.push(json!({"command": "solid.hole", "params": p}));
+            }
+            Some("construction_plane") => match f.get("method").and_then(Value::as_str) {
+                Some("offset") => out.push(json!({"command": "construct.plane.offset", "params": {"base": f.get("base"), "offset": f.get("offset"), "name": name}})),
+                _ => {
+                    // Use the resulting plane as recorded.
+                    let (o, n) = (f.get("result_origin").cloned().unwrap_or(json!([0, 0, 0])), f.get("result_normal").cloned().unwrap_or(Value::Null));
+                    if n.is_null() {
+                        return Err(format!("recipe: construction plane method {:?} without result_normal", f.get("method")));
+                    }
+                    out.push(json!({"command": "construct.plane.offset", "params": {"base": {"origin": o, "normal": n}, "offset": 0, "name": name}}));
+                }
+            },
+            Some("split_body") => out.push(json!({"command": "solid.split_body", "params": {"body": f.get("body"), "plane": f.get("tool"), "name": name}})),
+            Some("mirror") => {
+                let pl = f.get("plane").cloned().unwrap_or(Value::Null);
+                let plane = match pl.get("ref").and_then(Value::as_str) {
+                    Some(r @ ("XY" | "XZ" | "YZ")) => json!(r),
+                    _ => json!({"origin": pl.get("origin").cloned().unwrap_or(json!([0, 0, 0])), "normal": pl.get("normal")}),
+                };
+                let mut p = json!({"features": feature_refs(f.get("features")), "plane": plane, "name": name});
+                if f.get("mirror_of").and_then(Value::as_str) == Some("bodies") {
+                    p = json!({"bodies": f.get("bodies"), "combine": f.get("combine").cloned().unwrap_or(json!(false)), "plane": plane, "name": name});
+                }
+                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}}))
+            }
+            Some("chamfer") => {
+                out.push(json!({"command": "solid.chamfer", "params": {"edges": edge_points(f), "distance": f.get("distance"), "name": name}}))
+            }
+            Some(other) => return Err(format!("recipe: feature op `{other}` is not supported yet")),
+            None => return Err("recipe: feature without `op`".into()),
+        }
+    }
+    Ok(json!({"commands": out}))
+}
+
+fn edge_points(f: &Value) -> Value {
+    Value::Array(
+        f.get("edges")
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+            .map(|e| e.get("point").or(e.get("mid")).cloned().unwrap_or_else(|| e.clone()))
+            .collect(),
+    )
+}
+
+/// A pattern's source features may carry an occurrence suffix ("Hole1 (1)"); the features are
+/// the recipe's own names.
+fn feature_refs(v: Option<&Value>) -> Value {
+    let list: Vec<Value> = v
+        .and_then(Value::as_array)
+        .into_iter()
+        .flatten()
+        .map(|x| match x.as_str() {
+            Some(s) => {
+                let t = s.trim();
+                let base = match t.rfind(" (") {
+                    Some(i) if t.ends_with(')') && t[i + 2..t.len() - 1].chars().all(|c| c.is_ascii_digit()) => &t[..i],
+                    _ => t,
+                };
+                json!(base)
+            }
+            None => x.clone(),
+        })
+        .collect();
+    json!(list)
+}

apps/solidcraft-cli/src/spatial.rs

@@ -0,0 +1,333 @@
+//! Geometry comparison helpers: an STL reader, bounding boxes, volume, centre of mass and principal
+//! second moments of a closed triangle mesh, and a sampled symmetric Hausdorff distance between two
+//! triangle meshes.
+
+use std::collections::HashMap;
+
+/// A triangle soup in mm.
+pub type Tri = [[f64; 3]; 3];
+
+fn sub(a: [f64; 3], b: [f64; 3]) -> [f64; 3] {
+    [a[0] - b[0], a[1] - b[1], a[2] - b[2]]
+}
+fn add(a: [f64; 3], b: [f64; 3]) -> [f64; 3] {
+    [a[0] + b[0], a[1] + b[1], a[2] + b[2]]
+}
+fn scale(a: [f64; 3], s: f64) -> [f64; 3] {
+    [a[0] * s, a[1] * s, a[2] * s]
+}
+fn dot(a: [f64; 3], b: [f64; 3]) -> f64 {
+    a[0] * b[0] + a[1] * b[1] + a[2] * b[2]
+}
+fn cross(a: [f64; 3], b: [f64; 3]) -> [f64; 3] {
+    [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]]
+}
+
+/// Read a binary (or ASCII) STL file.
+pub fn read_stl(path: &str) -> Result<Vec<Tri>, String> {
+    let b = std::fs::read(path).map_err(|e| format!("{path}: {e}"))?;
+    if b.len() >= 84 {
+        let n = u32::from_le_bytes([b[80], b[81], b[82], b[83]]) as usize;
+        if b.len() == 84 + 50 * n {
+            let f = |o: usize| f64::from(f32::from_le_bytes([b[o], b[o + 1], b[o + 2], b[o + 3]]));
+            return Ok((0..n)
+                .map(|i| {
+                    let o = 84 + 50 * i + 12;
+                    let v = |k: usize| [f(o + 12 * k), f(o + 12 * k + 4), f(o + 12 * k + 8)];
+                    [v(0), v(1), v(2)]
+                })
+                .collect());
+        }
+    }
+    let text = String::from_utf8_lossy(&b);
+    let mut verts = Vec::new();
+    for line in text.lines() {
+        let mut it = line.split_whitespace();
+        if it.next() == Some("vertex") {
+            let c: Vec<f64> = it.filter_map(|x| x.parse().ok()).collect();
+            if c.len() == 3 {
+                verts.push([c[0], c[1], c[2]]);
+            }
+        }
+    }
+    if verts.is_empty() || verts.len() % 3 != 0 {
+        return Err(format!("{path}: not an STL file"));
+    }
+    Ok(verts.chunks(3).map(|c| [c[0], c[1], c[2]]).collect())
+}
+
+/// Volume, centre of mass and the principal second moments of volume (mm^5, sorted ascending) of a
+/// closed, outward-oriented triangle soup, by signed tetrahedra from the origin.
+pub fn mass_properties(tris: &[Tri]) -> (f64, [f64; 3], [f64; 3]) {
+    let (mut v6, mut m1) = (0.0, [0.0; 3]);
+    let mut c = [[0.0; 3]; 3]; // ∫ x xᵀ dV
+    for t in tris {
+        let d = dot(t[0], cross(t[1], t[2]));
+        v6 += d;
+        let s = add(add(t[0], t[1]), t[2]);
+        m1 = add(m1, scale(s, d / 24.0));
+        for (i, row) in c.iter_mut().enumerate() {
+            for (j, cell) in row.iter_mut().enumerate() {
+                let vv: f64 = t.iter().map(|p| p[i] * p[j]).sum::<f64>() + s[i] * s[j];
+                *cell += d / 120.0 * vv;
+            }
+        }
+    }
+    let vol = v6 / 6.0;
+    if vol.abs() < 1e-12 {
+        return (0.0, [0.0; 3], [0.0; 3]);
+    }
+    let com = scale(m1, 1.0 / vol);
+    // Central covariance and inertia tensor I = tr(C)·1 − C.
+    let mut cc = c;
+    for (i, row) in cc.iter_mut().enumerate() {
+        for (j, cell) in row.iter_mut().enumerate() {
+            *cell -= vol * com[i] * com[j];
+        }
+    }
+    let tr = cc[0][0] + cc[1][1] + cc[2][2];
+    let mut inertia = [[0.0; 3]; 3];
+    for i in 0..3 {
+        for j in 0..3 {
+            inertia[i][j] = if i == j { tr - cc[i][j] } else { -cc[i][j] };
+        }
+    }
+    let mut ev = eigen_sym3(inertia);
+    ev.sort_by(f64::total_cmp);
+    (vol, com, ev)
+}
+
+/// Eigenvalues of a symmetric 3×3 matrix (Jacobi rotations).
+fn eigen_sym3(mut a: [[f64; 3]; 3]) -> [f64; 3] {
+    for _ in 0..50 {
+        let (mut p, mut q, mut big) = (0, 1, 0.0);
+        for (i, j) in [(0, 1), (0, 2), (1, 2)] {
+            if a[i][j].abs() > big {
+                (p, q, big) = (i, j, a[i][j].abs());
+            }
+        }
+        if big <= 1e-15 * (a[0][0].abs() + a[1][1].abs() + a[2][2].abs()).max(1e-300) {
+            break;
+        }
+        let theta = (a[q][q] - a[p][p]) / (2.0 * a[p][q]);
+        let t = theta.signum() / (theta.abs() + (theta * theta + 1.0).sqrt());
+        let t = if theta == 0.0 { 1.0 } else { t };
+        let (cs, sn) = (1.0 / (t * t + 1.0).sqrt(), t / (t * t + 1.0).sqrt());
+        let mut b = a;
+        for k in 0..3 {
+            b[k][p] = cs * a[k][p] - sn * a[k][q];
+            b[k][q] = sn * a[k][p] + cs * a[k][q];
+        }
+        let mut c2 = b;
+        for k in 0..3 {
+            c2[p][k] = cs * b[p][k] - sn * b[q][k];
+            c2[q][k] = sn * b[p][k] + cs * b[q][k];
+        }
+        a = c2;
+    }
+    [a[0][0], a[1][1], a[2][2]]
+}
+
+/// Axis-aligned bounds of a triangle soup.
+pub fn bounds(tris: &[Tri]) -> ([f64; 3], [f64; 3]) {
+    let (mut lo, mut hi) = ([f64::INFINITY; 3], [f64::NEG_INFINITY; 3]);
+    for p in tris.iter().flatten() {
+        for k in 0..3 {
+            lo[k] = lo[k].min(p[k]);
+            hi[k] = hi[k].max(p[k]);
+        }
+    }
+    (lo, hi)
+}
+
+/// Distance from a point to a triangle (Ericson, Real-Time Collision Detection 5.1.5).
+fn point_tri(p: [f64; 3], t: &Tri) -> f64 {
+    let (a, b, c) = (t[0], t[1], t[2]);
+    let (ab, ac, ap) = (sub(b, a), sub(c, a), sub(p, a));
+    let (d1, d2) = (dot(ab, ap), dot(ac, ap));
+    let q = if d1 <= 0.0 && d2 <= 0.0 {
+        a
+    } else {
+        let bp = sub(p, b);
+        let (d3, d4) = (dot(ab, bp), dot(ac, bp));
+        if d3 >= 0.0 && d4 <= d3 {
+            b
+        } else {
+            let vc = d1 * d4 - d3 * d2;
+            if vc <= 0.0 && d1 >= 0.0 && d3 <= 0.0 {
+                add(a, scale(ab, d1 / (d1 - d3)))
+            } else {
+                let cp = sub(p, c);
+                let (d5, d6) = (dot(ab, cp), dot(ac, cp));
+                if d6 >= 0.0 && d5 <= d6 {
+                    c
+                } else {
+                    let vb = d5 * d2 - d1 * d6;
+                    if vb <= 0.0 && d2 >= 0.0 && d6 <= 0.0 {
+                        add(a, scale(ac, d2 / (d2 - d6)))
+                    } else {
+                        let va = d3 * d6 - d5 * d4;
+                        if va <= 0.0 && (d4 - d3) >= 0.0 && (d5 - d6) >= 0.0 {
+                            add(b, scale(sub(c, b), (d4 - d3) / ((d4 - d3) + (d5 - d6))))
+                        } else {
+                            let den = va + vb + vc;
+                            if den.abs() < 1e-300 { a } else { add(a, add(scale(ab, vb / den), scale(ac, vc / den))) }
+                        }
+                    }
+                }
+            }
+        }
+    };
+    let d = sub(p, q);
+    dot(d, d).sqrt()
+}
+
+/// Uniform grid of triangles for distance queries up to `cap`.
+struct Grid<'a> {
+    tris: &'a [Tri],
+    cell: f64,
+    cells: HashMap<(i64, i64, i64), Vec<u32>>,
+}
+
+impl<'a> Grid<'a> {
+    fn new(tris: &'a [Tri], cell: f64) -> Self {
+        let mut cells: HashMap<(i64, i64, i64), Vec<u32>> = HashMap::new();
+        let key = |x: f64| (x / cell).floor() as i64;
+        for (i, t) in tris.iter().enumerate() {
+            let (lo, hi) = bounds(std::slice::from_ref(t));
+            for x in key(lo[0])..=key(hi[0]) {
+                for y in key(lo[1])..=key(hi[1]) {
+                    for z in key(lo[2])..=key(hi[2]) {
+                        cells.entry((x, y, z)).or_default().push(i as u32);
+                    }
+                }
+            }
+        }
+        Grid { tris, cell, cells }
+    }
+
+    /// Distance from `p` to the nearest triangle, or `cap` if none is that close. Searches shells
+    /// of cells outwards and stops once the nearest hit is closer than the unsearched shells.
+    fn distance(&self, p: [f64; 3], cap: f64, seen: &mut [u32], stamp: u32) -> f64 {
+        let rmax = (cap / self.cell).ceil() as i64;
+        let k = |x: f64| (x / self.cell).floor() as i64;
+        let (cx, cy, cz) = (k(p[0]), k(p[1]), k(p[2]));
+        let mut best = cap;
+        for r in 0..=rmax {
+            for x in cx - r..=cx + r {
+                for y in cy - r..=cy + r {
+                    for z in cz - r..=cz + r {
+                        // only the shell at Chebyshev distance r
+                        if (x - cx).abs() != r && (y - cy).abs() != r && (z - cz).abs() != r {
+                            continue;
+                        }
+                        let Some(list) = self.cells.get(&(x, y, z)) else { continue };
+                        for &i in list {
+                            let Some(slot) = seen.get_mut(i as usize) else { continue };
+                            if *slot == stamp {
+                                continue;
+                            }
+                            *slot = stamp;
+                            if let Some(t) = self.tris.get(i as usize) {
+                                best = best.min(point_tri(p, t));
+                            }
+                        }
+                    }
+                }
+            }
+            // Everything not yet searched is at least r·cell away from p.
+            if best <= r as f64 * self.cell {
+                break;
+            }
+        }
+        best
+    }
+}
+
+/// At most this many sample points per side (larger meshes are sampled with an even stride).
+const MAX_SAMPLES: usize = 250_000;
+
+/// Sample points of a triangle soup: its vertices and triangle centroids (every k-th triangle for
+/// very large meshes).
+fn samples(tris: &[Tri]) -> Vec<[f64; 3]> {
+    let stride = (tris.len() * 4).div_ceil(MAX_SAMPLES).max(1);
+    let mut out: Vec<[f64; 3]> = Vec::with_capacity(tris.len() * 4 / stride + 4);
+    for t in tris.iter().step_by(stride) {
+        out.extend_from_slice(t);
+        out.push(scale(add(add(t[0], t[1]), t[2]), 1.0 / 3.0));
+    }
+    out
+}
+
+/// One-sided sampled distance from `from` to `to`: (max, mean, worst sample point). Distances are
+/// capped at `cap`.
+fn one_sided(from: &[Tri], to: &[Tri], cap: f64) -> (f64, f64, [f64; 3]) {
+    let (lo, hi) = bounds(to);
+    let diag = dot(sub(hi, lo), sub(hi, lo)).sqrt();
+    // Cells about twice the typical triangle size (so a cell holds a handful of triangles), but no
+    // finer than diag/400 (so big flat triangles don't fill too many cells).
+    let area: f64 = to.iter().map(|t| dot(cross(sub(t[1], t[0]), sub(t[2], t[0])), cross(sub(t[1], t[0]), sub(t[2], t[0]))).sqrt() / 2.0).sum();
+    let typical = (area / to.len().max(1) as f64).sqrt();
+    let grid = Grid::new(to, (2.0 * typical).max(diag / 400.0).max(1e-3));
+    let mut seen = vec![0u32; to.len()];
+    let (mut max, mut sum, mut worst, mut n) = (0.0f64, 0.0, [0.0; 3], 0usize);
+    for (i, p) in samples(from).into_iter().enumerate() {
+        let d = grid.distance(p, cap, &mut seen, i as u32 + 1);
+        sum += d;
+        n += 1;
+        if d > max {
+            max = d;
+            worst = p;
+        }
+    }
+    (max, if n > 0 { sum / n as f64 } else { 0.0 }, worst)
+}
+
+/// Sampled symmetric Hausdorff distance between two triangle soups (distances capped at `cap`).
+pub struct Hausdorff {
+    pub a_to_b: f64,
+    pub b_to_a: f64,
+    pub mean: f64,
+    /// Where the larger one-sided distance was found (mm, world).
+    pub worst_at: [f64; 3],
+}
+
+pub fn hausdorff(a_mesh: &[Tri], b_mesh: &[Tri], cap: f64) -> Hausdorff {
+    let (a, am, ap) = one_sided(a_mesh, b_mesh, cap);
+    let (b, bm, bp) = one_sided(b_mesh, a_mesh, cap);
+    Hausdorff { a_to_b: a, b_to_a: b, mean: (am + bm) / 2.0, worst_at: if a >= b { ap } else { bp } }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn cube(s: f64, o: [f64; 3]) -> Vec<Tri> {
+        let v = |x: f64, y: f64, z: f64| [o[0] + x * s, o[1] + y * s, o[2] + z * s];
+        let q = |a: [f64; 3], b: [f64; 3], c: [f64; 3], d: [f64; 3]| vec![[a, b, c], [a, c, d]];
+        let mut t = Vec::new();
+        t.extend(q(v(0., 0., 0.), v(0., 1., 0.), v(1., 1., 0.), v(1., 0., 0.)));
+        t.extend(q(v(0., 0., 1.), v(1., 0., 1.), v(1., 1., 1.), v(0., 1., 1.)));
+        t.extend(q(v(0., 0., 0.), v(1., 0., 0.), v(1., 0., 1.), v(0., 0., 1.)));
+        t.extend(q(v(0., 1., 0.), v(0., 1., 1.), v(1., 1., 1.), v(1., 1., 0.)));
+        t.extend(q(v(0., 0., 0.), v(0., 0., 1.), v(0., 1., 1.), v(0., 1., 0.)));
+        t.extend(q(v(1., 0., 0.), v(1., 1., 0.), v(1., 1., 1.), v(1., 0., 1.)));
+        t
+    }
+
+    #[test]
+    fn box_moments_and_distance() {
+        let c = cube(10.0, [5.0, -3.0, 2.0]);
+        let (v, com, pm) = mass_properties(&c);
+        assert!((v - 1000.0).abs() < 1e-9 && (com[0] - 10.0).abs() < 1e-9 && (com[2] - 7.0).abs() < 1e-9);
+        // V·(a²+b²)/12 for a cube of side 10: 1000·200/12.
+        for m in pm {
+            assert!((m - 1000.0 * 200.0 / 12.0).abs() < 1e-6, "{pm:?}");
+        }
+        let moved = cube(10.0, [5.0, -3.0, 2.3]);
+        let h = hausdorff(&c, &moved, 1.0);
+        assert!((h.a_to_b - 0.3).abs() < 1e-9 && (h.b_to_a - 0.3).abs() < 1e-9);
+        let same = hausdorff(&c, &c, 1.0);
+        assert!(same.a_to_b < 1e-12);
+    }
+}

apps/solidcraft-cli/tests/commands_output.rs

@@ -0,0 +1,26 @@
+//! The registry remains valid JSON and a closed pipeline reader must not cause a panic.
+
+use std::process::{Command, Stdio};
+
+#[test]
+fn registry_output_is_complete_json() {
+    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("commands").output().unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    let registry: serde_json::Value = serde_json::from_slice(&output.stdout).unwrap();
+    let commands = registry.as_array().unwrap();
+    assert!(commands.iter().any(|command| command["id"] == "solid.box"));
+    assert!(commands.iter().any(|command| command["id"] == "engine.commands"));
+    assert!(output.stdout.ends_with(b"\n"));
+    assert!(output.stderr.is_empty());
+}
+
+#[test]
+fn closed_registry_pipe_exits_without_panicking() {
+    let mut child = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("commands").stdout(Stdio::piped()).stderr(Stdio::piped()).spawn().unwrap();
+    // Close our read end before waiting. No sleeps or timing threshold are needed:
+    // the registry is larger than the pipe buffer, so it cannot all be written first.
+    drop(child.stdout.take());
+    let output = child.wait_with_output().unwrap();
+    assert!(output.status.success(), "status: {}; stderr: {}", output.status, String::from_utf8_lossy(&output.stderr));
+    assert!(output.stderr.is_empty(), "{}", String::from_utf8_lossy(&output.stderr));
+}

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

@@ -0,0 +1,26 @@
+# Design file corpus
+
+Designs saved by older SolidCraft builds. `tests/design_corpus.rs` opens each one with the
+current build and checks that it evaluates as it did when saved (the `.expected.json` next to
+it is `solidcraft-cli eval` of that file by the build that saved it: bodies, volumes, areas,
+world bounding boxes), that it is upgraded to the current file format, and that damaged and
+hostile variants of it never panic.
+
+| File | Saved by | Era |
+|---|---|---|
+| `m0-box-fillet-hole` | 3714342 | M0: sketch, parameters, extrude, fillet, cut |
+| `m0-revolve-primitives` | 3714342 | M0: revolve, primitives, combine, chamfer, timeline edit |
+| `components-arm` | 97d03e3 | components and occurrences: move, copy, Paste New, ground |
+| `joints-hinge` | c2309eb | joints: revolute hinge driven by a parameter |
+| `modern-sheet-metal` | bd98035 | sheet metal contour flange (oracle 72) |
+| `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`) |
+| `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) |
+
+The scripts that made them are in `scripts/` (`issue-489-stacked-join` was drawn in the desktop
+app and has none). 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/components-arm.expected.json

@@ -0,0 +1,134 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 700.5299915783324,
+      "bbox": {
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+          10.0,
+          10.0,
+          10.000000000000007
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+        "min": [
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+          -6.080836915950756e-16
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+        4.999999999366269,
+        4.999999996470206
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+      "edges": 14,
+      "face_types": {
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+        "plane": 6
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+      "faces": 7,
+      "kernel": {
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+        "faces": 8,
+        "shells": 1,
+        "vertices": 12
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+      "mass_g": 1.1279207478827844,
+      "material": "Default",
+      "name": "Base",
+      "vertices": 10,
+      "volume_mm3": 874.3571689013833
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+  "body_count": 1,
+  "params": [],
+  "sketches": [
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+      "id": 11,
+      "name": "S1",
+      "profiles": 1,
+      "status": "solved"
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+  "timeline": [
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+      "id": 1,
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+      "name": "Box1",
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+      "type": "BoxFeature",
+      "warning": null
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+    {
+      "error": null,
+      "id": 4,
+      "ms": 1.004123,
+      "name": "Box2",
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+      "type": "BoxFeature",
+      "warning": null
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+    {
+      "error": null,
+      "id": 5,
+      "ms": 6.818065,
+      "name": "Fillet1",
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+      "suppressed": false,
+      "type": "FilletFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 9,
+      "ms": 0.223829,
+      "name": "Box2 (copy)",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "BoxFeature",
+      "warning": null
+    },
+    {
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+      "id": 10,
+      "ms": 6.139636,
+      "name": "Fillet1 (copy)",
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+      "suppressed": false,
+      "type": "FilletFeature",
+      "warning": null
+    },
+    {
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+      "id": 11,
+      "ms": 0.045728,
+      "name": "S1",
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+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
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+      "id": 12,
+      "ms": 1537.323948,
+      "name": "Extrude1",
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+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
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+  ],
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+    "faces": 7,
+    "mass_g": 1.1279207478827844,
+    "vertices": 10,
+    "volume_mm3": 874.3571689013833
+  }
+}

apps/solidcraft-cli/tests/corpus/components-arm.solidcraft

@@ -0,0 +1,263 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Box1",
+      "suppressed": false,
+      "body_names": [
+        "Base"
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+      "corner": [
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+        0.0,
+        0.0
+      ],
+      "length": "10",
+      "width": "10",
+      "height": "10",
+      "operation": "new_body"
+    },
+    {
+      "id": 4,
+      "name": "Box2",
+      "suppressed": false,
+      "body_names": [
+        "ArmBody"
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+      "component": 2,
+      "type": "box",
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+      "length": "10",
+      "width": "4",
+      "height": "4",
+      "operation": "new_body"
+    },
+    {
+      "id": 5,
+      "name": "Fillet1",
+      "suppressed": false,
+      "component": 2,
+      "type": "fillet",
+      "edges": [
+        [
+          25.0,
+          4.0,
+          4.0
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+      "radius": "1"
+    },
+    {
+      "id": 9,
+      "name": "Box2 (copy)",
+      "suppressed": false,
+      "component": 7,
+      "type": "box",
+      "corner": [
+        20.0,
+        0.0,
+        0.0
+      ],
+      "length": "10",
+      "width": "4",
+      "height": "4",
+      "operation": "new_body"
+    },
+    {
+      "id": 10,
+      "name": "Fillet1 (copy)",
+      "suppressed": false,
+      "component": 7,
+      "type": "fillet",
+      "edges": [
+        [
+          25.0,
+          4.0,
+          4.0
+        ]
+      ],
+      "radius": "1"
+    },
+    {
+      "id": 11,
+      "name": "S1",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "c1.center",
+            "pos": [
+              5.0,
+              5.0
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+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "c1",
+            "type": "circle",
+            "c": 1,
+            "r": 2.0,
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+        ],
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+        "counters": {
+          "c": 1
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+    },
+    {
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+      "name": "Extrude1",
+      "suppressed": false,
+      "type": "extrude",
+      "sketch": 11,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "10",
+        "direction": "positive"
+      },
+      "operation": "cut"
+    }
+  ],
+  "next_id": 13,
+  "components": [
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+    {
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+      "name": "Arm (copy)",
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+  ],
+  "occurrences": [
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+      "grounded": true
+    },
+    {
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+      "component": 2,
+      "parent": 0,
+      "name": "Arm:2",
+      "transform": [
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+          0.0,
+          0.0,
+          0.0
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+        [
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+          0.0,
+          1.0,
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+      "grounded": false
+    },
+    {
+      "id": 8,
+      "component": 7,
+      "parent": 0,
+      "name": "Arm (copy):1",
+      "transform": [
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+          0.0,
+          0.0
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+        [
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+          1.0,
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+        [
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+        [
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+          20.0,
+          0.0,
+          1.0
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+      ],
+      "grounded": false
+    }
+  ]
+}

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

@@ -0,0 +1,157 @@
+{
+  "bodies": [
+    {
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+      "bbox": {
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+          0.0
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+        5.524909928104648e-14,
+        -1.0945382096961234e-12,
+        22.366336633663238
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+      "material": "Default",
+      "name": "Body1",
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+      "volume_mm3": 254519.9999999979
+    }
+  ],
+  "body_count": 1,
+  "params": [
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+      "error": null,
+      "expression": "84",
+      "model": true,
+      "name": "d1",
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+      "value": 84.0
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+    {
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+      "error": null,
+      "expression": "70",
+      "model": true,
+      "name": "d2",
+      "unit": "mm",
+      "value": 70.0
+    },
+    {
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+      "error": null,
+      "expression": "62",
+      "model": true,
+      "name": "d4",
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+      "value": 62.0
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+  ],
+  "sketches": [
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+      "id": 1,
+      "name": "Sketch1",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    },
+    {
+      "curves": 10,
+      "dof": 1,
+      "id": 3,
+      "name": "Sketch2",
+      "profiles": 3,
+      "status": "solved",
+      "visible": false
+    }
+  ],
+  "timeline": [
+    {
+      "boolean_diagnostics": {
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+        "truncated": false
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+      "error": null,
+      "id": 1,
+      "ms": 0.131943,
+      "name": "Sketch1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
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+    {
+      "boolean_diagnostics": {
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+      "id": 2,
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+      "name": "Extrude1",
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+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
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+    {
+      "boolean_diagnostics": {
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+      "id": 3,
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+      "type": "Sketch",
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+    {
+      "boolean_diagnostics": {
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+      "id": 4,
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+    "mass_g": 328.33079999999734,
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+    "volume_mm3": 254519.9999999979
+  }
+}

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

@@ -0,0 +1,539 @@
+{
+  "features": [
+    {
+      "id": 1,
+      "name": "Sketch1",
+      "plane": {
+        "name": "XY",
+        "type": "origin"
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+      "sketch": {
+        "constraints": [
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+            "l": 0,
+            "type": "horizontal"
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+          {
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+            "l": 2,
+            "type": "horizontal"
+          },
+          {
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+            "p": 5,
+            "type": "midpoint"
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+          {
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+            "q": 5,
+            "type": "coincident"
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+          {
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+            "l": 1,
+            "param": "d1",
+            "type": "length",
+            "value": 84.0
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+          {
+            "id": "k8",
+            "l": 0,
+            "param": "d2",
+            "type": "length",
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+            "id": "l1",
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+          {
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+            "b": 3,
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+            "id": "l2",
+            "type": "line"
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+          {
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+            "b": 4,
+            "construction": false,
+            "id": "l3",
+            "type": "line"
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+          {
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+            "b": 1,
+            "construction": false,
+            "id": "l4",
+            "type": "line"
+          },
+          {
+            "a": 1,
+            "b": 3,
+            "construction": true,
+            "id": "l5",
+            "type": "line"
+          },
+          {
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+            "b": 4,
+            "construction": true,
+            "id": "l6",
+            "type": "line"
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+        ],
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+          {
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+              -42.0
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+          {
+            "fixed": false,
+            "id": "p3",
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+          {
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+      "param_names": [
+        "d3"
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+      "profiles": {
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+            "l2",
+            "l3",
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+        "type": "curves"
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+      "sketch": 1,
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+      "type": "extrude"
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+    {
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+      "name": "Sketch2",
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+          "component": 0,
+          "coordinates": [
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+            0.0
+          ],
+          "path": [],
+          "target": {
+            "body": "Body1",
+            "certificate": {
+              "high": true,
+              "holes": [],
+              "kind": "extrude_cap",
+              "outer": [
+                "l1",
+                "l2",
+                "l3",
+                "l4"
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+              "sketch": 1
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+            "name": "F2:cap:high:ed6121d9bed14d3fd103f347231990d103349f33b7874ad292d3c4d3539266c3",
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+            "point": [
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+          "y_dir": [
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+            1.0,
+            0.0
+          ]
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+        "type": "face"
+      },
+      "sketch": {
+        "constraints": [
+          {
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+            "l": 4,
+            "type": "horizontal"
+          },
+          {
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+            "l": 6,
+            "type": "horizontal"
+          },
+          {
+            "id": "k3",
+            "l": 5,
+            "type": "vertical"
+          },
+          {
+            "id": "k4",
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+            "type": "vertical"
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+          {
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+            "p": 9,
+            "type": "midpoint"
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+          {
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+            "q": 9,
+            "type": "coincident"
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+          {
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+            "p": 7,
+            "param": "d4",
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+            "id": "l1",
+            "link": "j1",
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+            "b": 1,
+            "construction": false,
+            "id": "l2",
+            "link": "j1",
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+            "id": "l3",
+            "link": "j1",
+            "type": "line"
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+          {
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+            "b": 3,
+            "construction": false,
+            "id": "l4",
+            "link": "j1",
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+          {
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+            "b": 6,
+            "construction": false,
+            "id": "l5",
+            "type": "line"
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+          {
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+            "b": 7,
+            "construction": false,
+            "id": "l6",
+            "type": "line"
+          },
+          {
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+            "b": 8,
+            "construction": false,
+            "id": "l7",
+            "type": "line"
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+          {
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+            "b": 5,
+            "construction": false,
+            "id": "l8",
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+          {
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+            "b": 7,
+            "construction": true,
+            "id": "l9",
+            "type": "line"
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+          {
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+            "b": 8,
+            "construction": true,
+            "id": "l10",
+            "type": "line"
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+        ],
+        "links": [
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+            "face_name": "F2:cap:high:ed6121d9bed14d3fd103f347231990d103349f33b7874ad292d3c4d3539266c3",
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+                30.0
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+              "body": "Body1",
+              "type": "face"
+            }
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+            "id": "origin",
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+            "id": "p1",
+            "link": "j1",
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+              -42.0
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+          },
+          {
+            "fixed": true,
+            "id": "p2",
+            "link": "j1",
+            "pos": [
+              -35.0,
+              42.0
+            ]
+          },
+          {
+            "fixed": true,
+            "id": "p3",
+            "link": "j1",
+            "pos": [
+              35.0,
+              -42.0
+            ]
+          },
+          {
+            "fixed": true,
+            "id": "p4",
+            "link": "j1",
+            "pos": [
+              35.0,
+              42.0
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p5",
+            "pos": [
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+              -31.000000000002185
+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p6",
+            "pos": [
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+          {
+            "fixed": false,
+            "id": "p7",
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+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p8",
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+            ]
+          },
+          {
+            "fixed": false,
+            "id": "p9",
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+              0.0
+            ]
+          }
+        ]
+      },
+      "suppressed": false,
+      "type": "sketch"
+    },
+    {
+      "extent": {
+        "direction": "positive",
+        "distance": "18"
+      },
+      "id": 4,
+      "name": "Extrude2",
+      "operation": "join",
+      "param_names": [
+        "d5"
+      ],
+      "profiles": {
+        "loops": [
+          [
+            "l1",
+            "l5",
+            "l4",
+            "l7"
+          ]
+        ],
+        "type": "curves"
+      },
+      "sketch": 3,
+      "suppressed": false,
+      "type": "extrude"
+    }
+  ],
+  "format": "solidcraft/14",
+  "name": "Untitled",
+  "next_id": 6,
+  "params": [
+    {
+      "expr": "84",
+      "model": true,
+      "name": "d1",
+      "unit": "mm"
+    },
+    {
+      "expr": "70",
+      "model": true,
+      "name": "d2",
+      "unit": "mm"
+    },
+    {
+      "expr": "62",
+      "model": true,
+      "name": "d4",
+      "unit": "mm"
+    }
+  ],
+  "units": "mm"
+}

apps/solidcraft-cli/tests/corpus/joints-hinge.expected.json

@@ -0,0 +1,217 @@
+{
+  "bodies": [
+    {
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+      "bbox": {
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+          30.0,
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+        1.5
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+      "material": "Default",
+      "name": "Body1",
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+      "volume_mm3": 3600.0
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+      "material": "Default",
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+      "volume_mm3": 2010.2853270198937
+    },
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+  "params": [
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+      "expression": "90 deg",
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+    {
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+    {
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+      "id": 8,
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+      "type": "CylinderFeature",
+      "warning": null
+    }
+  ],
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+    "mass_g": 14.474536143711237,
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+    "volume_mm3": 11220.570654039719
+  }
+}

apps/solidcraft-cli/tests/corpus/joints-hinge.solidcraft

@@ -0,0 +1,225 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [
+    {
+      "name": "open_angle",
+      "expr": "90 deg",
+      "unit": "deg",
+      "model": false
+    }
+  ],
+  "features": [
+    {
+      "id": 3,
+      "name": "Box1",
+      "suppressed": false,
+      "param_names": [
+        "d1",
+        "d2",
+        "d3"
+      ],
+      "component": 1,
+      "type": "box",
+      "corner": [
+        0.0,
+        0.0,
+        0.0
+      ],
+      "length": "40",
+      "width": "30",
+      "height": "3",
+      "operation": "new_body"
+    },
+    {
+      "id": 4,
+      "name": "Cylinder1",
+      "suppressed": false,
+      "param_names": [
+        "d4",
+        "d5"
+      ],
+      "component": 1,
+      "type": "cylinder",
+      "base": [
+        0.0,
+        33.0,
+        4.0
+      ],
+      "axis": [
+        1.0,
+        0.0,
+        0.0
+      ],
+      "radius": "4",
+      "height": "40",
+      "operation": "new_body"
+    },
+    {
+      "id": 7,
+      "name": "Box2",
+      "suppressed": false,
+      "param_names": [
+        "d6",
+        "d7",
+        "d8"
+      ],
+      "component": 5,
+      "type": "box",
+      "corner": [
+        0.0,
+        0.0,
+        0.0
+      ],
+      "length": "40",
+      "width": "30",
+      "height": "3",
+      "operation": "new_body"
+    },
+    {
+      "id": 8,
+      "name": "Cylinder2",
+      "suppressed": false,
+      "param_names": [
+        "d9",
+        "d10"
+      ],
+      "component": 5,
+      "type": "cylinder",
+      "base": [
+        0.0,
+        33.0,
+        4.0
+      ],
+      "axis": [
+        1.0,
+        0.0,
+        0.0
+      ],
+      "radius": "4",
+      "height": "40",
+      "operation": "new_body"
+    }
+  ],
+  "next_id": 9,
+  "components": [
+    {
+      "id": 1,
+      "name": "LeafA",
+      "parent": 0
+    },
+    {
+      "id": 5,
+      "name": "LeafB",
+      "parent": 0
+    }
+  ],
+  "occurrences": [
+    {
+      "id": 2,
+      "component": 1,
+      "parent": 0,
+      "name": "LeafA:1",
+      "transform": [
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+          0.0,
+          0.0,
+          0.0
+        ],
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+          1.0,
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+        [
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+          0.0,
+          1.0,
+          0.0
+        ],
+        [
+          0.0,
+          0.0,
+          0.0,
+          1.0
+        ]
+      ],
+      "grounded": true
+    },
+    {
+      "id": 6,
+      "component": 5,
+      "parent": 0,
+      "name": "LeafB:1",
+      "transform": [
+        [
+          1.0,
+          0.0,
+          0.0,
+          0.0
+        ],
+        [
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+          6.123233995736766e-17,
+          -1.0,
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+        ],
+        [
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+          1.0,
+          6.123233995736766e-17,
+          0.0
+        ],
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+          29.000000000000075,
+          37.000000000000064,
+          1.0
+        ]
+      ],
+      "grounded": false
+    }
+  ],
+  "assembly": {
+    "joints": [
+      {
+        "id": 1,
+        "name": "Hinge",
+        "kind": "revolute",
+        "a": {
+          "occurrence": 2,
+          "snap": {
+            "type": "circle_center",
+            "pick": [
+              1.0,
+              37.0,
+              4.0
+            ]
+          }
+        },
+        "b": {
+          "occurrence": 6,
+          "snap": {
+            "type": "circle_center",
+            "pick": [
+              1.0,
+              37.0,
+              4.0
+            ]
+          }
+        },
+        "values": [
+          1.5707963267948966
+        ],
+        "limits": [
+          null
+        ],
+        "offset": 0.0,
+        "angle": 0.0
+      }
+    ]
+  }
+}

apps/solidcraft-cli/tests/corpus/m0-box-fillet-hole.expected.json

@@ -0,0 +1,128 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 5641.5699696719,
+      "bbox": {
+        "max": [
+          40.0,
+          30.0,
+          20.00000000000001
+        ],
+        "min": [
+          0.0,
+          0.0,
+          -2.331468351865795e-15
+        ]
+      },
+      "center_of_mass": [
+        20.0333953680467,
+        15.02475683626249,
+        9.999999936169297
+      ],
+      "edges": 17,
+      "face_types": {
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+        "plane": 6
+      },
+      "faces": 8,
+      "kernel": {
+        "edges": 21,
+        "faces": 9,
+        "shells": 1,
+        "vertices": 14
+      },
+      "name": "Body1",
+      "vertices": 12,
+      "volume_mm3": 22391.21832759239
+    }
+  ],
+  "body_count": 1,
+  "params": [
+    {
+      "comment": "",
+      "error": null,
+      "expression": "40 mm",
+      "model": false,
+      "name": "width",
+      "unit": "mm",
+      "value": 40.0
+    }
+  ],
+  "sketches": [
+    {
+      "curves": 4,
+      "dof": 4,
+      "id": 1,
+      "name": "Sketch1",
+      "profiles": 1,
+      "status": "solved"
+    },
+    {
+      "curves": 1,
+      "dof": 3,
+      "id": 4,
+      "name": "Sketch2",
+      "profiles": 1,
+      "status": "solved"
+    }
+  ],
+  "timeline": [
+    {
+      "error": null,
+      "id": 1,
+      "ms": 0.043782999999999996,
+      "name": "Sketch1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 1.609402,
+      "name": "Extrude1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 3,
+      "ms": 11.196359,
+      "name": "Fillet1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "FilletFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 4,
+      "ms": 0.031249,
+      "name": "Sketch2",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 5,
+      "ms": 1378.231746,
+      "name": "Extrude2",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    }
+  ],
+  "total": {
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+    "edges": 17,
+    "faces": 8,
+    "vertices": 12,
+    "volume_mm3": 22391.21832759239
+  }
+}

apps/solidcraft-cli/tests/corpus/m0-box-fillet-hole.solidcraft

@@ -0,0 +1,208 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [
+    {
+      "name": "width",
+      "expr": "40 mm",
+      "unit": "mm",
+      "model": false
+    }
+  ],
+  "features": [
+    {
+      "id": 1,
+      "name": "Sketch1",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "p1",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p2",
+            "pos": [
+              40.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p3",
+            "pos": [
+              40.0,
+              30.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p4",
+            "pos": [
+              0.0,
+              30.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l5",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l6",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l7",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l8",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [
+          {
+            "id": "k9",
+            "type": "horizontal",
+            "l": 0
+          },
+          {
+            "id": "k10",
+            "type": "horizontal",
+            "l": 2
+          },
+          {
+            "id": "k11",
+            "type": "vertical",
+            "l": 1
+          },
+          {
+            "id": "k12",
+            "type": "vertical",
+            "l": 3
+          }
+        ],
+        "next_id": 13
+      }
+    },
+    {
+      "id": 2,
+      "name": "Extrude1",
+      "suppressed": false,
+      "type": "extrude",
+      "sketch": 1,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "width / 2",
+        "direction": "positive"
+      },
+      "operation": "new_body"
+    },
+    {
+      "id": 3,
+      "name": "Fillet1",
+      "suppressed": false,
+      "type": "fillet",
+      "edges": [
+        [
+          0.0,
+          0.0,
+          10.0
+        ]
+      ],
+      "radius": "3"
+    },
+    {
+      "id": 4,
+      "name": "Sketch2",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "c1.center",
+            "pos": [
+              20.0,
+              15.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "c1",
+            "type": "circle",
+            "c": 1,
+            "r": 5.0,
+            "construction": false
+          }
+        ],
+        "constraints": [],
+        "next_id": 2
+      }
+    },
+    {
+      "id": 5,
+      "name": "Extrude2",
+      "suppressed": false,
+      "type": "extrude",
+      "sketch": 4,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "20",
+        "direction": "positive"
+      },
+      "operation": "cut"
+    }
+  ],
+  "next_id": 6
+}

apps/solidcraft-cli/tests/corpus/m0-revolve-primitives.expected.json

@@ -0,0 +1,155 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 835.4130709318358,
+      "bbox": {
+        "max": [
+          15.0,
+          15.0,
+          5.0
+        ],
+        "min": [
+          -15.0,
+          0.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        -5.1971813422033816e-8,
+        8.063488509334698,
+        2.500000003353729
+      ],
+      "edges": 12,
+      "face_types": {
+        "cylinder": 2,
+        "plane": 4
+      },
+      "faces": 6,
+      "kernel": {
+        "edges": 28,
+        "faces": 14,
+        "shells": 1,
+        "vertices": 16
+      },
+      "name": "Body1",
+      "vertices": 8,
+      "volume_mm3": 981.8090960455798
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+    {
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+        "shells": 1,
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+      "name": "Body2",
+      "vertices": 12,
+      "volume_mm3": 869.3724925404262
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+  "body_count": 2,
+  "params": [],
+  "sketches": [
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+      "dof": 8,
+      "id": 1,
+      "name": "Sketch1",
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+      "status": "solved"
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+  ],
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+      "suppressed": false,
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+      "warning": null
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+    {
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+      "id": 6,
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+  ],
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+    "vertices": 20,
+    "volume_mm3": 1851.181588586006
+  }
+}

apps/solidcraft-cli/tests/corpus/m0-revolve-primitives.solidcraft

@@ -0,0 +1,171 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Sketch1",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XZ"
+      },
+      "sketch": {
+        "points": [
+          {
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+              0.0
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+            "fixed": true
+          },
+          {
+            "id": "l1.start",
+            "pos": [
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+              0.0
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+            "fixed": false
+          },
+          {
+            "id": "l1.end",
+            "pos": [
+              15.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l2.end",
+            "pos": [
+              15.0,
+              5.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l3.end",
+            "pos": [
+              10.0,
+              5.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
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+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [],
+        "next_id": 5
+      }
+    },
+    {
+      "id": 2,
+      "name": "Revolve1",
+      "suppressed": false,
+      "type": "revolve",
+      "sketch": 1,
+      "profiles": {
+        "type": "all"
+      },
+      "axis": {
+        "type": "sketch_axis",
+        "axis": "y"
+      },
+      "angle": "180 deg",
+      "operation": "new_body"
+    },
+    {
+      "id": 3,
+      "name": "Box1",
+      "suppressed": false,
+      "type": "box",
+      "corner": [
+        30.0,
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+        0.0
+      ],
+      "length": "10",
+      "width": "10",
+      "height": "10",
+      "operation": "new_body"
+    },
+    {
+      "id": 4,
+      "name": "Cylinder1",
+      "suppressed": false,
+      "type": "cylinder",
+      "base": [
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+        5.0,
+        -5.0
+      ],
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+        0.0,
+        1.0
+      ],
+      "radius": "(4) / 2",
+      "height": "20",
+      "operation": "new_body"
+    },
+    {
+      "id": 5,
+      "name": "Combine1",
+      "suppressed": false,
+      "type": "combine",
+      "target": "Body2",
+      "tools": [
+        "Body3"
+      ],
+      "operation": "cut",
+      "keep_tools": false
+    },
+    {
+      "id": 6,
+      "name": "Chamfer1",
+      "suppressed": false,
+      "type": "chamfer",
+      "edges": [
+        [
+          30.0,
+          5.0,
+          10.0
+        ]
+      ],
+      "distance": "1"
+    }
+  ],
+  "next_id": 7
+}

apps/solidcraft-cli/tests/corpus/modern-path-pattern.expected.json

@@ -0,0 +1,122 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 16463.932136252846,
+      "bbox": {
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+          60.0,
+          5.0000000000000036
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+        "min": [
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+          0.0,
+          0.0
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+      "center_of_mass": [
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+        29.965234604788655,
+        2.4999999999999867
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+      "edges": 26,
+      "face_types": {
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+        "plane": 6
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+      "faces": 13,
+      "kernel": {
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+        "faces": 20,
+        "shells": 1,
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+      "mass_g": 45.163625870882676,
+      "material": "Default",
+      "name": "Plate",
+      "vertices": 22,
+      "volume_mm3": 35010.56269060673
+    }
+  ],
+  "body_count": 1,
+  "params": [],
+  "sketches": [
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+      "dof": 8,
+      "id": 1,
+      "name": "Plate_sketch",
+      "profiles": 1,
+      "status": "solved"
+    },
+    {
+      "curves": 2,
+      "dof": 6,
+      "id": 3,
+      "name": "PathSketch",
+      "profiles": 1,
+      "status": "solved"
+    }
+  ],
+  "timeline": [
+    {
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+      "id": 1,
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+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 9.166392,
+      "name": "Plate",
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+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
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+      "id": 3,
+      "ms": 0.057569999999999996,
+      "name": "PathSketch",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 4,
+      "ms": 84.237259,
+      "name": "Hole1",
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+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
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+      "id": 5,
+      "ms": 1093.817516,
+      "name": "PathPattern1",
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+      "suppressed": false,
+      "type": "PathPatternFeature",
+      "warning": null
+    }
+  ],
+  "total": {
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+    "faces": 13,
+    "mass_g": 45.163625870882676,
+    "vertices": 22,
+    "volume_mm3": 35010.56269060673
+  }
+}

apps/solidcraft-cli/tests/corpus/modern-path-pattern.solidcraft

@@ -0,0 +1,238 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Plate_sketch",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "l1.start",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l1.end",
+            "pos": [
+              120.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l2.end",
+            "pos": [
+              120.0,
+              60.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l3.end",
+            "pos": [
+              0.0,
+              60.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [],
+        "counters": {}
+      }
+    },
+    {
+      "id": 2,
+      "name": "Plate",
+      "suppressed": false,
+      "body_names": [
+        "Plate"
+      ],
+      "param_names": [
+        "d1"
+      ],
+      "type": "extrude",
+      "sketch": 1,
+      "profiles": {
+        "type": "curves",
+        "loops": [
+          [
+            "l1",
+            "l2",
+            "l3",
+            "l4"
+          ]
+        ]
+      },
+      "extent": {
+        "distance": "5",
+        "direction": "positive"
+      },
+      "operation": "new_body"
+    },
+    {
+      "id": 3,
+      "name": "PathSketch",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "a1.center",
+            "pos": [
+              60.0,
+              3.3333333333333335
+            ],
+            "fixed": false
+          },
+          {
+            "id": "a1.start",
+            "pos": [
+              100.0,
+              15.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "a1.end",
+            "pos": [
+              20.0,
+              15.000000000000002
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "a1",
+            "type": "arc",
+            "c": 1,
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "c1",
+            "type": "circle",
+            "c": 2,
+            "r": 3.0,
+            "construction": false
+          }
+        ],
+        "constraints": [],
+        "counters": {}
+      }
+    },
+    {
+      "id": 4,
+      "name": "Hole1",
+      "suppressed": false,
+      "body_names": [
+        "Plate"
+      ],
+      "param_names": [
+        "d2"
+      ],
+      "type": "extrude",
+      "sketch": 3,
+      "profiles": {
+        "type": "curves",
+        "loops": [
+          [
+            "c1"
+          ]
+        ]
+      },
+      "extent": {
+        "distance": "0",
+        "direction": "positive",
+        "through_all": true
+      },
+      "operation": "cut"
+    },
+    {
+      "id": 5,
+      "name": "PathPattern1",
+      "suppressed": false,
+      "param_names": [
+        "d3",
+        "d4"
+      ],
+      "type": "pattern",
+      "features": [
+        "Hole1"
+      ],
+      "pattern": {
+        "type": "path",
+        "path_sketch": 3,
+        "path": [
+          "a1"
+        ],
+        "count": "7",
+        "spacing": "17.875031"
+      }
+    }
+  ],
+  "next_id": 6
+}

apps/solidcraft-cli/tests/corpus/modern-plastic.expected.json

@@ -0,0 +1,126 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 24280.380636378435,
+      "bbox": {
+        "max": [
+          80.0,
+          50.0,
+          32.0
+        ],
+        "min": [
+          0.0,
+          0.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        39.89510389356416,
+        24.906013036240918,
+        10.936558895792075
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 82,
+      "face_types": {
+        "cone": 1,
+        "cylinder": 1,
+        "plane": 35
+      },
+      "faces": 37,
+      "kernel": {
+        "edges": 90,
+        "faces": 39,
+        "shells": 1,
+        "vertices": 60
+      },
+      "mass_g": 29.716687268283682,
+      "material": "Default",
+      "name": "Body1",
+      "vertices": 56,
+      "volume_mm3": 23036.19168084006
+    }
+  ],
+  "body_count": 1,
+  "params": [
+    {
+      "comment": "",
+      "error": null,
+      "expression": "2 mm",
+      "model": false,
+      "name": "wall",
+      "unit": "mm",
+      "value": 2.0
+    }
+  ],
+  "sketches": [],
+  "timeline": [
+    {
+      "error": null,
+      "id": 1,
+      "ms": 13.671479,
+      "name": "Box1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "BoxFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 15.729548999999999,
+      "name": "Shell1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ShellFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 3,
+      "ms": 136.407014,
+      "name": "Lip1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "LipFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 4,
+      "ms": 530.869306,
+      "name": "Boss1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "BossFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 5,
+      "ms": 176.568115,
+      "name": "Rest1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "RestFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 6,
+      "ms": 260.395779,
+      "name": "SnapFit1",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "SnapFitFeature",
+      "warning": null
+    }
+  ],
+  "total": {
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+    "edges": 82,
+    "faces": 37,
+    "mass_g": 29.716687268283682,
+    "vertices": 56,
+    "volume_mm3": 23036.19168084006
+  }
+}

apps/solidcraft-cli/tests/corpus/modern-plastic.solidcraft

@@ -0,0 +1,158 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [
+    {
+      "name": "wall",
+      "expr": "2 mm",
+      "unit": "mm",
+      "model": false
+    }
+  ],
+  "features": [
+    {
+      "id": 1,
+      "name": "Box1",
+      "suppressed": false,
+      "param_names": [
+        "d1",
+        "d2",
+        "d3"
+      ],
+      "type": "box",
+      "corner": [
+        0.0,
+        0.0,
+        0.0
+      ],
+      "length": "80",
+      "width": "50",
+      "height": "30",
+      "operation": "new_body"
+    },
+    {
+      "id": 2,
+      "name": "Shell1",
+      "suppressed": false,
+      "param_names": [
+        "d4"
+      ],
+      "type": "shell",
+      "faces": [
+        [
+          40.0,
+          25.0,
+          30.0
+        ]
+      ],
+      "thickness": "wall"
+    },
+    {
+      "id": 3,
+      "name": "Lip1",
+      "suppressed": false,
+      "param_names": [
+        "d5",
+        "d6"
+      ],
+      "type": "lip",
+      "face": [
+        1.0,
+        25.0,
+        30.0
+      ],
+      "width": "1",
+      "height": "2"
+    },
+    {
+      "id": 4,
+      "name": "Boss1",
+      "suppressed": false,
+      "param_names": [
+        "d7",
+        "d8",
+        "d9",
+        "d10"
+      ],
+      "type": "boss",
+      "position": [
+        20.0,
+        20.0,
+        2.0
+      ],
+      "direction": [
+        0.0,
+        0.0,
+        1.0
+      ],
+      "diameter": "6",
+      "height": "10",
+      "hole_diameter": "2.5",
+      "draft": "1 deg"
+    },
+    {
+      "id": 5,
+      "name": "Rest1",
+      "suppressed": false,
+      "param_names": [
+        "d11",
+        "d12",
+        "d13",
+        "d14"
+      ],
+      "type": "rest",
+      "position": [
+        60.0,
+        30.0,
+        2.0
+      ],
+      "direction": [
+        0.0,
+        0.0,
+        1.0
+      ],
+      "width": "8",
+      "length": "12",
+      "height": "3",
+      "thickness": "1"
+    },
+    {
+      "id": 6,
+      "name": "SnapFit1",
+      "suppressed": false,
+      "param_names": [
+        "d15",
+        "d16",
+        "d17",
+        "d18",
+        "d19"
+      ],
+      "type": "snap_fit",
+      "position": [
+        40.0,
+        12.0,
+        2.0
+      ],
+      "direction": [
+        0.0,
+        0.0,
+        1.0
+      ],
+      "hook": [
+        0.0,
+        1.0,
+        0.0
+      ],
+      "length": "12",
+      "thickness": "1.5",
+      "width": "6",
+      "catch_depth": "1",
+      "catch_length": "2"
+    }
+  ],
+  "next_id": 7,
+  "plastic": {
+    "active": "ABS (1.5mm)"
+  }
+}

apps/solidcraft-cli/tests/corpus/modern-sheet-metal.expected.json

@@ -0,0 +1,85 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 10411.967792188118,
+      "bbox": {
+        "max": [
+          70.0,
+          50.00000000000002,
+          32.500000000000014
+        ],
+        "min": [
+          0.0,
+          -4.440892098500626e-14,
+          -5.329070518200751e-15
+        ]
+      },
+      "center_of_mass": [
+        36.03765771659564,
+        24.999999999999982,
+        15.08756759282672
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 44,
+      "face_types": {
+        "cylinder": 4,
+        "plane": 10
+      },
+      "faces": 22,
+      "kernel": {
+        "edges": 44,
+        "faces": 22,
+        "shells": 1,
+        "vertices": 24
+      },
+      "mass_g": 15.605746095907175,
+      "material": "Default",
+      "name": "Body1",
+      "sheet_metal": true,
+      "vertices": 24,
+      "volume_mm3": 12097.477593726493
+    }
+  ],
+  "body_count": 1,
+  "params": [],
+  "sketches": [
+    {
+      "curves": 3,
+      "dof": 8,
+      "id": 1,
+      "name": "Contour",
+      "profiles": 0,
+      "status": "solved"
+    }
+  ],
+  "timeline": [
+    {
+      "error": null,
+      "id": 1,
+      "ms": 0.074984,
+      "name": "Contour",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 37.187197,
+      "name": "ContourFlange",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ContourFlangeFeature",
+      "warning": null
+    }
+  ],
+  "total": {
+    "area_mm2": 10411.967792188118,
+    "edges": 44,
+    "faces": 22,
+    "mass_g": 15.605746095907175,
+    "vertices": 24,
+    "volume_mm3": 12097.477593726493
+  }
+}

apps/solidcraft-cli/tests/corpus/modern-sheet-metal.solidcraft

@@ -0,0 +1,120 @@
+{
+  "format": "solidcraft/1",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Contour",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "custom",
+        "plane": {
+          "origin": [
+            0.0,
+            0.0,
+            0.0
+          ],
+          "x_dir": [
+            1.0,
+            0.0,
+            0.0
+          ],
+          "y_dir": [
+            0.0,
+            0.0,
+            -1.0
+          ]
+        }
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "l1.start",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l1.end",
+            "pos": [
+              40.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l2.end",
+            "pos": [
+              40.0,
+              -30.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "l3.end",
+            "pos": [
+              70.0,
+              -30.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          }
+        ],
+        "constraints": [],
+        "counters": {}
+      }
+    },
+    {
+      "id": 2,
+      "name": "ContourFlange",
+      "suppressed": false,
+      "param_names": [
+        "d1"
+      ],
+      "type": "sheet_contour",
+      "sketch": 1,
+      "curves": [
+        "l1",
+        "l2",
+        "l3"
+      ],
+      "distance": "50"
+    }
+  ],
+  "next_id": 3
+}

apps/solidcraft-cli/tests/corpus/naming-split-pieces.expected.json

@@ -0,0 +1,144 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 4078.7680390666596,
+      "bbox": {
+        "max": [
+          40.0,
+          30.000000000000014,
+          12.000000000000002
+        ],
+        "min": [
+          0.0,
+          0.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        19.25890231218174,
+        15.000000010054242,
+        5.04117761026949
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 30,
+      "face_types": {
+        "cylinder": 1,
+        "plane": 11
+      },
+      "faces": 12,
+      "kernel": {
+        "edges": 30,
+        "faces": 12,
+        "shells": 1,
+        "vertices": 20
+      },
+      "mass_g": 14.435720327850033,
+      "material": "Default",
+      "name": "Body1",
+      "vertices": 20,
+      "volume_mm3": 11190.480874302351
+    }
+  ],
+  "body_count": 1,
+  "params": [],
+  "sketches": [
+    {
+      "curves": 4,
+      "dof": 2,
+      "id": 1,
+      "name": "Base",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    },
+    {
+      "curves": 4,
+      "dof": 4,
+      "id": 3,
+      "name": "SlotSketch",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    }
+  ],
+  "timeline": [
+    {
+      "error": null,
+      "id": 1,
+      "ms": 0.09895799999999999,
+      "name": "Base",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 20.768292000000002,
+      "name": "Block",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 3,
+      "ms": 0.057,
+      "name": "SlotSketch",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 4,
+      "ms": 136.28875,
+      "name": "Slot",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 5,
+      "ms": 153.58625,
+      "name": "Round",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "FilletFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 6,
+      "ms": 169.174375,
+      "name": "Bevel",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ChamferFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 7,
+      "ms": 47.772166,
+      "name": "Raise",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "OffsetFacesFeature",
+      "warning": null
+    }
+  ],
+  "total": {
+    "area_mm2": 4078.7680390666596,
+    "edges": 30,
+    "faces": 12,
+    "mass_g": 14.435720327850033,
+    "vertices": 20,
+    "volume_mm3": 11190.480874302351
+  }
+}

apps/solidcraft-cli/tests/corpus/naming-split-pieces.solidcraft

@@ -0,0 +1,373 @@
+{
+  "format": "solidcraft/13",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Base",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "p1",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p2",
+            "pos": [
+              40.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p3",
+            "pos": [
+              40.0,
+              30.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p4",
+            "pos": [
+              0.0,
+              30.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [
+          {
+            "id": "k1",
+            "type": "horizontal",
+            "l": 0
+          },
+          {
+            "id": "k2",
+            "type": "horizontal",
+            "l": 2
+          },
+          {
+            "id": "k3",
+            "type": "vertical",
+            "l": 1
+          },
+          {
+            "id": "k4",
+            "type": "vertical",
+            "l": 3
+          },
+          {
+            "id": "k5",
+            "type": "coincident",
+            "p": 0,
+            "q": 1
+          }
+        ],
+        "counters": {
+          "k": 5,
+          "l": 4,
+          "p": 4
+        }
+      }
+    },
+    {
+      "id": 2,
+      "name": "Block",
+      "suppressed": false,
+      "param_names": [
+        "d1"
+      ],
+      "type": "extrude",
+      "sketch": 1,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "10",
+        "direction": "positive"
+      },
+      "operation": "new_body"
+    },
+    {
+      "id": 3,
+      "name": "SlotSketch",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "p1",
+            "pos": [
+              15.0,
+              -5.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p2",
+            "pos": [
+              25.0,
+              -5.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p3",
+            "pos": [
+              25.0,
+              35.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p4",
+            "pos": [
+              15.0,
+              35.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [
+          {
+            "id": "k1",
+            "type": "horizontal",
+            "l": 0
+          },
+          {
+            "id": "k2",
+            "type": "horizontal",
+            "l": 2
+          },
+          {
+            "id": "k3",
+            "type": "vertical",
+            "l": 1
+          },
+          {
+            "id": "k4",
+            "type": "vertical",
+            "l": 3
+          }
+        ],
+        "counters": {
+          "k": 4,
+          "l": 4,
+          "p": 4
+        }
+      }
+    },
+    {
+      "id": 4,
+      "name": "Slot",
+      "suppressed": false,
+      "param_names": [
+        "d2",
+        "d3"
+      ],
+      "type": "extrude",
+      "sketch": 3,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "10",
+        "direction": "positive",
+        "start_offset": "5"
+      },
+      "operation": "cut"
+    },
+    {
+      "id": 5,
+      "name": "Round",
+      "suppressed": false,
+      "param_names": [
+        "d4"
+      ],
+      "edge_refs": [
+        {
+          "dir": [
+            0.0,
+            -1.0,
+            0.0
+          ],
+          "min": [
+            0.0,
+            0.0,
+            0.0
+          ],
+          "max": [
+            40.0,
+            30.0,
+            10.0
+          ]
+        }
+      ],
+      "edge_names": [
+        "F2:side:l2|F2:top#2"
+      ],
+      "type": "fillet",
+      "edges": [
+        [
+          40.0,
+          15.0,
+          10.0
+        ]
+      ],
+      "radius": "2"
+    },
+    {
+      "id": 6,
+      "name": "Bevel",
+      "suppressed": false,
+      "param_names": [
+        "d5"
+      ],
+      "edge_refs": [
+        {
+          "dir": [
+            0.0,
+            1.0,
+            0.0
+          ],
+          "min": [
+            0.0,
+            0.0,
+            0.0
+          ],
+          "max": [
+            40.0,
+            30.000000000000007,
+            10.0
+          ]
+        }
+      ],
+      "edge_names": [
+        "F2:side:l4|F2:top#1"
+      ],
+      "type": "chamfer",
+      "edges": [
+        [
+          0.0,
+          15.0,
+          10.0
+        ]
+      ],
+      "distance": "1.5"
+    },
+    {
+      "id": 7,
+      "name": "Raise",
+      "suppressed": false,
+      "param_names": [
+        "d6"
+      ],
+      "face_names": [
+        "F2:top#1"
+      ],
+      "type": "offset_face",
+      "faces": [
+        [
+          7.0,
+          15.0,
+          10.0
+        ]
+      ],
+      "distance": "2"
+    }
+  ],
+  "next_id": 8
+}

apps/solidcraft-cli/tests/corpus/scripts/components-arm.json

@@ -0,0 +1,15 @@
+{"commands": [
+ {"command": "solid.box", "params": {"length": 10, "width": 10, "height": 10, "body_name": "Base"}},
+ {"command": "component.create", "params": {"name": "Arm"}},
+ {"command": "solid.box", "params": {"corner": [20, 0, 0], "length": 10, "width": 4, "height": 4, "body_name": "ArmBody"}},
+ {"command": "solid.fillet", "params": {"edges": [[25, 4, 4]], "radius": 1}},
+ {"command": "component.activate", "params": {"component": 0}},
+ {"command": "occurrence.move", "params": {"occurrence": 3, "translate": [0, 50, 0]}},
+ {"command": "occurrence.copy", "params": {"component": "Arm", "translate": [0, 20, 0]}},
+ {"command": "component.paste_new", "params": {"component": "Arm", "translate": [0, -30, 0]}},
+ {"command": "occurrence.ground", "params": {"occurrence": 3}},
+ {"command": "sketch.create", "params": {"plane": "XY", "name": "S1"}},
+ {"command": "sketch.circle.center", "params": {"center": [5, 5], "radius": 2}},
+ {"command": "sketch.finish", "params": {}},
+ {"command": "solid.extrude", "params": {"distance": 10, "operation": "cut"}}
+]}

apps/solidcraft-cli/tests/corpus/scripts/joints-hinge.json

@@ -0,0 +1,14 @@
+{"commands": [
+ {"command": "parameters.change", "params": {"name": "open_angle", "expression": "90 deg"}},
+ {"command": "component.create", "params": {"name": "LeafA"}},
+ {"command": "solid.box", "params": {"length": 40, "width": 30, "height": 3, "corner": [0, 0, 0]}},
+ {"command": "solid.cylinder", "params": {"base": [0, 33, 4], "axis": [1, 0, 0], "radius": 4, "height": 40, "operation": "new"}},
+ {"command": "component.activate", "params": {"component": "root"}},
+ {"command": "component.create", "params": {"name": "LeafB"}},
+ {"command": "solid.box", "params": {"length": 40, "width": 30, "height": 3, "corner": [0, 0, 0]}},
+ {"command": "solid.cylinder", "params": {"base": [0, 33, 4], "axis": [1, 0, 0], "radius": 4, "height": 40, "operation": "new"}},
+ {"command": "component.activate", "params": {"component": "root"}},
+ {"command": "occurrence.ground", "params": {"occurrence": 2, "grounded": true}},
+ {"command": "joint.create", "params": {"type": "revolute", "a": {"occurrence": "LeafA", "circle": [1, 37, 4]}, "b": {"occurrence": "LeafB", "circle": [1, 37, 4]}, "name": "Hinge"}},
+ {"command": "joint.drive", "params": {"joint": "Hinge", "value": "open_angle"}}
+]}

apps/solidcraft-cli/tests/corpus/scripts/m0-box-fillet-hole.json

@@ -0,0 +1,12 @@
+{"commands": [
+ {"command": "parameters.change", "params": {"name": "width", "expression": "40 mm"}},
+ {"command": "sketch.create", "params": {"plane": "XY"}},
+ {"command": "sketch.rectangle.two_point", "params": {"p0": [0, 0], "p1": [40, 30]}},
+ {"command": "sketch.finish", "params": {}},
+ {"command": "solid.extrude", "params": {"distance": "width / 2"}},
+ {"command": "solid.fillet", "params": {"edges": [[0, 0, 10]], "radius": 3}},
+ {"command": "sketch.create", "params": {"plane": "XY"}},
+ {"command": "sketch.circle.center", "params": {"center": [20, 15], "radius": 5}},
+ {"command": "sketch.finish", "params": {}},
+ {"command": "solid.extrude", "params": {"distance": 20, "operation": "cut"}}
+]}

apps/solidcraft-cli/tests/corpus/scripts/m0-revolve-primitives.json

@@ -0,0 +1,11 @@
+{"commands": [
+ {"command": "sketch.create", "params": {"plane": "XZ"}},
+ {"command": "sketch.line", "params": {"points": [[10, 0], [15, 0], [15, 5], [10, 5]], "closed": true}},
+ {"command": "sketch.finish", "params": {}},
+ {"command": "solid.revolve", "params": {"axis": "y"}},
+ {"command": "solid.box", "params": {"length": 10, "width": 10, "height": 10, "corner": [30, 0, 0]}},
+ {"command": "solid.cylinder", "params": {"diameter": 4, "height": 20, "base": [35, 5, -5]}},
+ {"command": "solid.combine", "params": {"target": "Body2", "tools": ["Body3"], "operation": "cut"}},
+ {"command": "solid.chamfer", "params": {"edges": [[30, 5, 10]], "distance": 1}},
+ {"command": "timeline.edit", "params": {"feature": "Revolve1", "set": {"angle": "180 deg"}}}
+]}

apps/solidcraft-cli/tests/corpus/scripts/modern-path-pattern.json

@@ -0,0 +1,197 @@
+{
+  "commands": [
+    {
+      "command": "sketch.create",
+      "params": {
+        "name": "Plate_sketch",
+        "plane": "XY"
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l1"
+        ],
+        "points": [
+          [
+            0,
+            0
+          ],
+          [
+            120,
+            0
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l2"
+        ],
+        "points": [
+          "l1.end",
+          [
+            120,
+            60
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l3"
+        ],
+        "points": [
+          "l2.end",
+          [
+            0,
+            60
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l4"
+        ],
+        "points": [
+          "l3.end",
+          "l1.start"
+        ]
+      }
+    },
+    {
+      "command": "sketch.finish",
+      "params": {}
+    },
+    {
+      "command": "solid.extrude",
+      "params": {
+        "body_names": [
+          "Plate"
+        ],
+        "direction": "positive",
+        "distance": 5,
+        "name": "Plate",
+        "operation": "new",
+        "profiles": [
+          {
+            "area_mm2": 7200.0,
+            "centroid_sketch": [
+              60.0,
+              30.0
+            ],
+            "loops": [
+              {
+                "curves": [
+                  "l1",
+                  "l2",
+                  "l3",
+                  "l4"
+                ],
+                "outer": true
+              }
+            ],
+            "sketch": "Plate_sketch"
+          }
+        ],
+        "sketch": "Plate_sketch"
+      }
+    },
+    {
+      "command": "sketch.create",
+      "params": {
+        "name": "PathSketch",
+        "plane": "XY"
+      }
+    },
+    {
+      "command": "sketch.arc.three_point",
+      "params": {
+        "end": [
+          20,
+          15
+        ],
+        "id": "a1",
+        "start": [
+          100,
+          15
+        ],
+        "through": [
+          60,
+          45
+        ]
+      }
+    },
+    {
+      "command": "sketch.circle.center",
+      "params": {
+        "center": "a1.start",
+        "construction": false,
+        "id": "c1",
+        "radius": 3
+      }
+    },
+    {
+      "command": "sketch.finish",
+      "params": {}
+    },
+    {
+      "command": "solid.extrude",
+      "params": {
+        "body_names": [
+          "Plate"
+        ],
+        "direction": "positive",
+        "name": "Hole1",
+        "operation": "cut",
+        "profiles": [
+          {
+            "area_mm2": 28.274334,
+            "centroid_sketch": [
+              100.0,
+              15.0
+            ],
+            "loops": [
+              {
+                "curves": [
+                  "c1"
+                ],
+                "outer": true
+              }
+            ],
+            "sketch": "PathSketch"
+          }
+        ],
+        "sketch": "PathSketch",
+        "through_all": true
+      }
+    },
+    {
+      "command": "solid.pattern.path",
+      "params": {
+        "count": 7,
+        "features": [
+          "Hole1"
+        ],
+        "name": "PathPattern1",
+        "path": [
+          "a1"
+        ],
+        "path_sketch": "PathSketch",
+        "spacing": 17.875031
+      }
+    }
+  ]
+}

apps/solidcraft-cli/tests/corpus/scripts/modern-plastic.json

@@ -0,0 +1,10 @@
+{"commands": [
+ {"command": "parameters.change", "params": {"name": "wall", "expression": "2 mm"}},
+ {"command": "solid.box", "params": {"length": 80, "width": 50, "height": 30}},
+ {"command": "solid.shell", "params": {"faces": [[40, 25, 30]], "thickness": "wall"}},
+ {"command": "plastic.lip", "params": {"face": [1, 25, 30], "width": 1, "height": 2}},
+ {"command": "plastic.boss", "params": {"position": [20, 20, 2], "diameter": 6, "height": 10, "hole_diameter": 2.5, "draft": "1 deg"}},
+ {"command": "plastic.rest", "params": {"position": [60, 30, 2], "width": 8, "length": 12, "height": 3, "thickness": 1}},
+ {"command": "plastic.snap_fit", "params": {"position": [40, 12, 2], "direction": [0, 0, 1], "hook": [0, 1, 0], "length": 12, "thickness": 1.5, "width": 6, "catch_depth": 1, "catch_length": 2}},
+ {"command": "plastic.manage_rules", "params": {"name": "ABS (1.5mm)", "active": true}}
+]}

apps/solidcraft-cli/tests/corpus/scripts/modern-sheet-metal.json

@@ -0,0 +1,96 @@
+{
+  "commands": [
+    {
+      "command": "sketch.create",
+      "params": {
+        "name": "Contour",
+        "plane": {
+          "origin": [
+            0.0,
+            0.0,
+            0.0
+          ],
+          "x_dir": [
+            1.0,
+            0.0,
+            0.0
+          ],
+          "y_dir": [
+            0.0,
+            0.0,
+            -1.0
+          ]
+        }
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l1"
+        ],
+        "points": [
+          [
+            0.0,
+            0.0
+          ],
+          [
+            40.0,
+            0.0
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l2"
+        ],
+        "points": [
+          "l1.end",
+          [
+            40.0,
+            -30.0
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.line",
+      "params": {
+        "construction": false,
+        "ids": [
+          "l3"
+        ],
+        "points": [
+          "l2.end",
+          [
+            70.0,
+            -30.0
+          ]
+        ]
+      }
+    },
+    {
+      "command": "sketch.finish",
+      "params": {}
+    },
+    {
+      "command": "sheet.flange",
+      "params": {
+        "curves": [
+          "l1",
+          "l2",
+          "l3"
+        ],
+        "distance": 50,
+        "name": "ContourFlange",
+        "sketch": "Contour",
+        "type": "contour"
+      }
+    }
+  ]
+}

apps/solidcraft-cli/tests/corpus/scripts/naming-split-pieces.json

@@ -0,0 +1,111 @@
+{
+ "commands": [
+  {
+   "command": "sketch.create",
+   "params": {
+    "plane": "XY",
+    "name": "Base"
+   }
+  },
+  {
+   "command": "sketch.rectangle.two_point",
+   "params": {
+    "p0": [
+     0,
+     0
+    ],
+    "p1": [
+     40,
+     30
+    ]
+   }
+  },
+  {
+   "command": "sketch.finish",
+   "params": {}
+  },
+  {
+   "command": "solid.extrude",
+   "params": {
+    "distance": 10,
+    "name": "Block"
+   }
+  },
+  {
+   "command": "sketch.create",
+   "params": {
+    "plane": "XY",
+    "name": "SlotSketch"
+   }
+  },
+  {
+   "command": "sketch.rectangle.two_point",
+   "params": {
+    "p0": [
+     15,
+     -5
+    ],
+    "p1": [
+     25,
+     35
+    ]
+   }
+  },
+  {
+   "command": "sketch.finish",
+   "params": {}
+  },
+  {
+   "command": "solid.extrude",
+   "params": {
+    "sketch": "SlotSketch",
+    "distance": 10,
+    "start_offset": 5,
+    "operation": "cut",
+    "name": "Slot"
+   }
+  },
+  {
+   "command": "solid.fillet",
+   "params": {
+    "edges": [
+     [
+      40,
+      15,
+      10
+     ]
+    ],
+    "radius": 2,
+    "name": "Round"
+   }
+  },
+  {
+   "command": "solid.chamfer",
+   "params": {
+    "edges": [
+     [
+      0,
+      15,
+      10
+     ]
+    ],
+    "distance": 1.5,
+    "name": "Bevel"
+   }
+  },
+  {
+   "command": "solid.offset_face",
+   "params": {
+    "faces": [
+     [
+      7,
+      15,
+      10
+     ]
+    ],
+    "distance": 2,
+    "name": "Raise"
+   }
+  }
+ ]
+}

apps/solidcraft-cli/tests/corpus/scripts/split-body-pieces.json

@@ -0,0 +1,107 @@
+{
+ "commands": [
+  {
+   "command": "sketch.create",
+   "params": {
+    "plane": "XY",
+    "name": "Base"
+   }
+  },
+  {
+   "command": "sketch.rectangle.two_point",
+   "params": {
+    "p0": [
+     0,
+     0
+    ],
+    "p1": [
+     40,
+     30
+    ]
+   }
+  },
+  {
+   "command": "sketch.finish",
+   "params": {}
+  },
+  {
+   "command": "solid.extrude",
+   "params": {
+    "distance": 10,
+    "name": "Block"
+   }
+  },
+  {
+   "command": "sketch.create",
+   "params": {
+    "plane": "XY",
+    "name": "SlotSketch"
+   }
+  },
+  {
+   "command": "sketch.rectangle.two_point",
+   "params": {
+    "p0": [
+     -5,
+     12
+    ],
+    "p1": [
+     45,
+     18
+    ]
+   }
+  },
+  {
+   "command": "sketch.finish",
+   "params": {}
+  },
+  {
+   "command": "solid.extrude",
+   "params": {
+    "sketch": "SlotSketch",
+    "distance": 10,
+    "operation": "cut",
+    "name": "Slot"
+   }
+  },
+  {
+   "command": "solid.fillet",
+   "params": {
+    "edges": [
+     [
+      20,
+      0,
+      10
+     ]
+    ],
+    "radius": 2,
+    "body": "Body1 (1)",
+    "name": "NearRound"
+   }
+  },
+  {
+   "command": "solid.chamfer",
+   "params": {
+    "edges": [
+     [
+      20,
+      30,
+      10
+     ]
+    ],
+    "distance": 1.5,
+    "body": "Body1",
+    "name": "FarBevel"
+   }
+  },
+  {
+   "command": "appearance.assign",
+   "params": {
+    "bodies": [
+     "Body1 (1)"
+    ],
+    "color": "#cc3333"
+   }
+  }
+ ]
+}

apps/solidcraft-cli/tests/corpus/split-body-pieces.expected.json

@@ -0,0 +1,171 @@
+{
+  "bodies": [
+    {
+      "area_mm2": 1962.6028137423857,
+      "bbox": {
+        "max": [
+          40.0,
+          30.0,
+          10.0
+        ],
+        "min": [
+          0.0,
+          18.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        20.0,
+        23.94794952681388,
+        4.957413249211356
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 15,
+      "face_types": {
+        "plane": 7
+      },
+      "faces": 7,
+      "kernel": {
+        "edges": 15,
+        "faces": 7,
+        "shells": 1,
+        "vertices": 10
+      },
+      "mass_g": 6.13395,
+      "material": "Default",
+      "name": "Body1",
+      "vertices": 10,
+      "volume_mm3": 4755.0
+    },
+    {
+      "area_mm2": 1963.9401350108699,
+      "bbox": {
+        "max": [
+          40.00000000000002,
+          12.000000000000002,
+          10.0
+        ],
+        "min": [
+          -8.881784197001252e-15,
+          0.0,
+          0.0
+        ]
+      },
+      "center_of_mass": [
+        20.00000000000079,
+        6.040035701025577,
+        4.967173993940324
+      ],
+      "density_g_cm3": 1.29,
+      "edges": 15,
+      "face_types": {
+        "cylinder": 1,
+        "plane": 6
+      },
+      "faces": 7,
+      "kernel": {
+        "edges": 15,
+        "faces": 7,
+        "shells": 1,
+        "vertices": 10
+      },
+      "mass_g": 6.147677129601969,
+      "material": "Default",
+      "name": "Body1 (1)",
+      "vertices": 10,
+      "volume_mm3": 4765.64118573796
+    }
+  ],
+  "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": "SlotSketch",
+      "profiles": 1,
+      "status": "solved",
+      "visible": false
+    }
+  ],
+  "timeline": [
+    {
+      "error": null,
+      "id": 1,
+      "ms": 0.07066700000000001,
+      "name": "Base",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 2,
+      "ms": 0.7462909999999999,
+      "name": "Block",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 3,
+      "ms": 0.035125,
+      "name": "SlotSketch",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "Sketch",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 4,
+      "ms": 9.647208000000001,
+      "name": "Slot",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ExtrudeFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 5,
+      "ms": 3.443708,
+      "name": "NearRound",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "FilletFeature",
+      "warning": null
+    },
+    {
+      "error": null,
+      "id": 6,
+      "ms": 3.947834,
+      "name": "FarBevel",
+      "rolled_back": false,
+      "suppressed": false,
+      "type": "ChamferFeature",
+      "warning": null
+    }
+  ],
+  "total": {
+    "area_mm2": 3926.5429487532556,
+    "edges": 30,
+    "faces": 14,
+    "mass_g": 12.281627129601969,
+    "vertices": 20,
+    "volume_mm3": 9520.64118573796
+  }
+}

apps/solidcraft-cli/tests/corpus/split-body-pieces.solidcraft

@@ -0,0 +1,366 @@
+{
+  "format": "solidcraft/13",
+  "name": "Untitled",
+  "units": "mm",
+  "params": [],
+  "features": [
+    {
+      "id": 1,
+      "name": "Base",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "p1",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p2",
+            "pos": [
+              40.0,
+              0.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p3",
+            "pos": [
+              40.0,
+              30.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p4",
+            "pos": [
+              0.0,
+              30.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [
+          {
+            "id": "k1",
+            "type": "horizontal",
+            "l": 0
+          },
+          {
+            "id": "k2",
+            "type": "horizontal",
+            "l": 2
+          },
+          {
+            "id": "k3",
+            "type": "vertical",
+            "l": 1
+          },
+          {
+            "id": "k4",
+            "type": "vertical",
+            "l": 3
+          },
+          {
+            "id": "k5",
+            "type": "coincident",
+            "p": 0,
+            "q": 1
+          }
+        ],
+        "counters": {
+          "k": 5,
+          "l": 4,
+          "p": 4
+        }
+      }
+    },
+    {
+      "id": 2,
+      "name": "Block",
+      "suppressed": false,
+      "param_names": [
+        "d1"
+      ],
+      "type": "extrude",
+      "sketch": 1,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "10",
+        "direction": "positive"
+      },
+      "operation": "new_body"
+    },
+    {
+      "id": 3,
+      "name": "SlotSketch",
+      "suppressed": false,
+      "type": "sketch",
+      "plane": {
+        "type": "origin",
+        "name": "XY"
+      },
+      "sketch": {
+        "points": [
+          {
+            "id": "origin",
+            "pos": [
+              0.0,
+              0.0
+            ],
+            "fixed": true
+          },
+          {
+            "id": "p1",
+            "pos": [
+              -5.0,
+              12.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p2",
+            "pos": [
+              45.0,
+              12.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p3",
+            "pos": [
+              45.0,
+              18.0
+            ],
+            "fixed": false
+          },
+          {
+            "id": "p4",
+            "pos": [
+              -5.0,
+              18.0
+            ],
+            "fixed": false
+          }
+        ],
+        "curves": [
+          {
+            "id": "l1",
+            "type": "line",
+            "a": 1,
+            "b": 2,
+            "construction": false
+          },
+          {
+            "id": "l2",
+            "type": "line",
+            "a": 2,
+            "b": 3,
+            "construction": false
+          },
+          {
+            "id": "l3",
+            "type": "line",
+            "a": 3,
+            "b": 4,
+            "construction": false
+          },
+          {
+            "id": "l4",
+            "type": "line",
+            "a": 4,
+            "b": 1,
+            "construction": false
+          }
+        ],
+        "constraints": [
+          {
+            "id": "k1",
+            "type": "horizontal",
+            "l": 0
+          },
+          {
+            "id": "k2",
+            "type": "horizontal",
+            "l": 2
+          },
+          {
+            "id": "k3",
+            "type": "vertical",
+            "l": 1
+          },
+          {
+            "id": "k4",
+            "type": "vertical",
+            "l": 3
+          }
+        ],
+        "counters": {
+          "k": 4,
+          "l": 4,
+          "p": 4
+        }
+      }
+    },
+    {
+      "id": 4,
+      "name": "Slot",
+      "suppressed": false,
+      "param_names": [
+        "d2"
+      ],
+      "type": "extrude",
+      "sketch": 3,
+      "profiles": {
+        "type": "all"
+      },
+      "extent": {
+        "distance": "10",
+        "direction": "positive"
+      },
+      "operation": "cut"
+    },
+    {
+      "id": 5,
+      "name": "NearRound",
+      "suppressed": false,
+      "param_names": [
+        "d3"
+      ],
+      "edge_refs": [
+        {
+          "dir": [
+            -1.0,
+            0.0,
+            0.0
+          ],
+          "min": [
+            0.0,
+            0.0,
+            0.0
+          ],
+          "max": [
+            40.0,
+            12.000000000000002,
+            10.0
+          ]
+        }
+      ],
+      "edge_names": [
+        "F2:side:l1|F2:top"
+      ],
+      "type": "fillet",
+      "edges": [
+        [
+          20.0,
+          0.0,
+          10.0
+        ]
+      ],
+      "radius": "2",
+      "body": "Body1 (1)"
+    },
+    {
+      "id": 6,
+      "name": "FarBevel",
+      "suppressed": false,
+      "param_names": [
+        "d4"
+      ],
+      "edge_refs": [
+        {
+          "dir": [
+            1.0,
+            0.0,
+            0.0
+          ],
+          "min": [
+            0.0,
+            18.0,
+            0.0
+          ],
+          "max": [
+            40.0,
+            30.0,
+            10.0
+          ]
+        }
+      ],
+      "edge_names": [
+        "F2:side:l3|F2:top"
+      ],
+      "type": "chamfer",
+      "edges": [
+        [
+          20.0,
+          30.0,
+          10.0
+        ]
+      ],
+      "distance": "1.5",
+      "body": "Body1"
+    }
+  ],
+  "next_id": 7,
+  "appearances": {
+    "bodies": {
+      "Body1 (1)": {
+        "name": "Custom",
+        "color": [
+          204,
+          51,
+          51
+        ],
+        "opacity": 1.0
+      }
+    }
+  }
+}

apps/solidcraft-cli/tests/design_corpus.rs

@@ -0,0 +1,458 @@
+//! Designs saved by older SolidCraft builds (tests/corpus, see its README) open and evaluate as
+//! they did when they were saved; damaged and hostile design files never panic.
+
+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
+}
+
+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
+}
+
+/// Differences that are deliberate behaviour changes made before the file format had versions
+/// (no migration can tell those files apart): (file, check, why).
+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",
+    ),
+    ("components-arm", "body_count", "Measure counted only the root component's bodies then; it measures every placed body now"),
+];
+
+fn known(file: &str, check: &str) -> bool {
+    KNOWN.iter().any(|(f, c, _)| *f == file && *c == check)
+}
+
+/// Volumes and areas then came from coarser tessellation (and curved booleans and fillets have
+/// become exact since): the same part within this relative tolerance (the oracle's).
+const REL: f64 = 1e-3;
+
+fn close(a: f64, b: f64, rel: f64) -> bool {
+    (a - b).abs() <= rel * b.abs().max(1.0)
+}
+
+#[test]
+fn old_designs_open_and_evaluate_as_saved() {
+    let mut problems = Vec::new();
+    for p in corpus() {
+        let name = p.file_stem().unwrap_or_default().to_string_lossy().to_string();
+        let want: Value = serde_json::from_slice(&std::fs::read(p.with_extension("expected.json")).unwrap()).unwrap();
+        let mut s = open(&p);
+        for r in &s.model.results {
+            if let Some(e) = &r.error {
+                problems.push(format!("{name}: feature {}: {e}", r.id));
+            }
+        }
+        assert_eq!(s.doc.format, solidcraft_engine::doc::format::format_string(solidcraft_engine::doc::format::FORMAT), "{name}: upgraded");
+        let got = s.execute("inspect.measure", &json!({})).unwrap();
+        if got["body_count"] != want["body_count"] && !known(&name, "body_count") {
+            problems.push(format!("{name}: {} bodies, saved with {}", got["body_count"], want["body_count"]));
+        }
+        for w in want["bodies"].as_array().into_iter().flatten() {
+            let bname = w["name"].as_str().unwrap_or_default();
+            let Some(g) = got["bodies"].as_array().into_iter().flatten().find(|g| g["name"] == w["name"]) else {
+                problems.push(format!("{name}: body {bname} missing"));
+                continue;
+            };
+            for k in ["volume_mm3", "area_mm2"] {
+                let (a, b) = (g[k].as_f64().unwrap_or(f64::NAN), w[k].as_f64().unwrap_or(f64::NAN));
+                if !close(a, b, REL) {
+                    problems.push(format!("{name}: {bname} {k} {a} (saved {b})"));
+                }
+            }
+            if known(&name, &format!("{bname} bbox")) {
+                continue;
+            }
+            for (end, i) in [("min", 0), ("min", 1), ("min", 2), ("max", 0), ("max", 1), ("max", 2)] {
+                let (a, b) = (g["bbox"][end][i].as_f64().unwrap_or(f64::NAN), w["bbox"][end][i].as_f64().unwrap_or(f64::NAN));
+                if (a - b).abs() > 1e-3 * b.abs().max(1.0) {
+                    problems.push(format!("{name}: {bname} bbox {end}[{i}] {a} (saved {b})"));
+                }
+            }
+        }
+        // Saved again, it reads back the same.
+        let again = solidcraft_engine::doc::Document::from_json(&s.doc.to_json()).unwrap();
+        assert_eq!(again, *s.doc, "{name}: round trip");
+        let package = solidcraft_engine::io::write_design_container(&s.doc).unwrap();
+        let packaged = solidcraft_engine::io::read_design(&package).unwrap();
+        assert_eq!(packaged, *s.doc, "{name}: container round trip after migration");
+    }
+    assert!(problems.is_empty(), "{}", problems.join("\n"));
+}
+
+/// Names saved before format 14 were worked out from geometry, pieces of a split face numbered by
+/// where their centres lay (`F2:top#2`). They keep naming the faces they named: marked as such,
+/// they are found as the build that saved them found them, without new notes.
+#[test]
+fn names_saved_before_exact_history_find_the_faces_they_named() {
+    let path = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/corpus/naming-split-pieces.solidcraft");
+    let s = open(&path);
+    let feature = |name: &str| s.doc.features.iter().find(|f| f.name == name).unwrap_or_else(|| panic!("{name}"));
+    assert_eq!(feature("Round").edge_names, vec!["?F2:side:l2|F2:top#2".to_string()]);
+    assert_eq!(feature("Bevel").edge_names, vec!["?F2:side:l4|F2:top#1".to_string()]);
+    assert_eq!(feature("Raise").face_names, vec!["?F2:top#1".to_string()]);
+    for r in &s.model.results {
+        assert!(r.error.is_none() && r.warning.is_none(), "{}: {:?} {:?}", r.name, r.error, r.warning);
+    }
+    // The raised piece is the left one, as saved (the stored point is on it).
+    let state = s.model.state();
+    let solid = |p: [f64; 3]| state.bodies.iter().any(|b| b.body.contains(solidcraft_engine::geom::Vec3::new(p[0], p[1], p[2])));
+    assert!(solid([7.0, 15.0, 11.0]) && !solid([32.0, 15.0, 11.0]));
+}
+
+/// Body names saved before format 14 name the pieces of a split body in the kernel's shell order.
+/// The features after the split that refer to a piece by its body name still find that piece:
+/// the far one stays `Body1` (chamfered), the near one `Body1 (1)` (filleted, coloured).
+#[test]
+fn body_names_saved_before_exact_history_keep_their_pieces() {
+    let path = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/corpus/split-body-pieces.solidcraft");
+    let s = open(&path);
+    assert!(s.doc.features.iter().all(|f| f.shell_piece_order), "every saved feature keeps the shell order");
+    for r in &s.model.results {
+        assert!(r.error.is_none() && r.warning.is_none(), "{}: {:?} {:?}", r.name, r.error, r.warning);
+    }
+    let state = s.model.state();
+    let piece = |name: &str| state.bodies.iter().find(|b| b.name == name).unwrap_or_else(|| panic!("{name}"));
+    let solid = |name: &str, p: [f64; 3]| piece(name).body.contains(solidcraft_engine::geom::Vec3::new(p[0], p[1], p[2]));
+    assert!(solid("Body1", [20.0, 24.0, 5.0]) && solid("Body1 (1)", [20.0, 6.0, 5.0]));
+    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); 9] = [
+    ("issue-489-stacked-join", "Body1", Some(&[([1., 0., 0.], 35.), ([-1., 0., 0.], 35.)]), 491),
+    ("issue-489-stacked-join", "Body1", Some(&[([0., 0., 1.], 30.)]), 492),
+    ("m0-revolve-primitives", "Body2", Some(&[([-FRAC_1_SQRT_2, 0., FRAC_1_SQRT_2], -21. * FRAC_1_SQRT_2)]), 493),
+    ("split-body-pieces", "Body1", Some(&[([0., FRAC_1_SQRT_2, FRAC_1_SQRT_2], 38.5 * FRAC_1_SQRT_2), ([0., -1., 0.], -18.)]), 493),
+    ("split-body-pieces", "Body1 (1)", Some(&[([0., 1., 0.], 12.)]), 493),
+    ("m0-revolve-primitives", "Body1", None, 494),
+    ("naming-split-pieces", "Body1", None, 494),
+    ("modern-plastic", "Body1", None, 494),
+    ("modern-sheet-metal", "Body1", None, 495),
+];
+use std::f64::consts::FRAC_1_SQRT_2;
+
+/// 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 #491 is fixed"]
+fn a_side_face_join_merged_from_two_extrudes_takes_an_attached_sketch() {
+    known_faces_attach(491);
+}
+
+#[test]
+#[ignore = "fails until #492 is fixed"]
+fn a_face_split_into_pieces_by_a_later_feature_takes_an_attached_sketch() {
+    known_faces_attach(492);
+}
+
+#[test]
+#[ignore = "fails until #493 is fixed"]
+fn cut_walls_and_chamfer_faces_take_an_attached_sketch() {
+    known_faces_attach(493);
+}
+
+#[test]
+#[ignore = "fails until #494 is fixed"]
+fn faces_after_revolve_offset_face_and_boss_take_an_attached_sketch() {
+    known_faces_attach(494);
+}
+
+#[test]
+#[ignore = "fails until #495 is fixed"]
+fn sheet_metal_thickness_faces_take_an_attached_sketch() {
+    known_faces_attach(495);
+}
+
+/// A small deterministic generator (xorshift).
+struct Rng(u64);
+impl Rng {
+    fn next(&mut self) -> u64 {
+        self.0 ^= self.0 << 13;
+        self.0 ^= self.0 >> 7;
+        self.0 ^= self.0 << 17;
+        self.0
+    }
+    fn below(&mut self, n: usize) -> usize {
+        (self.next() % n.max(1) as u64) as usize
+    }
+}
+
+const HOSTILE: [&str; 14] =
+    ["0", "-1", "1e308", "-1e308", "1e9", "4294967297", "\"\"", "\"1/0\"", "\"((((1\"", "null", "true", "[]", "{}", "\"nope\""];
+
+/// Every JSON value in a document, as a path of keys and indices.
+fn paths(v: &Value, at: &mut Vec<Value>, out: &mut Vec<Vec<Value>>) {
+    out.push(at.clone());
+    match v {
+        Value::Object(m) => {
+            for (k, x) in m {
+                at.push(json!(k));
+                paths(x, at, out);
+                at.pop();
+            }
+        }
+        Value::Array(a) => {
+            for (i, x) in a.iter().enumerate() {
+                at.push(json!(i));
+                paths(x, at, out);
+                at.pop();
+            }
+        }
+        _ => {}
+    }
+}
+
+fn at_mut<'a>(v: &'a mut Value, path: &[Value]) -> Option<&'a mut Value> {
+    let mut cur = v;
+    for k in path {
+        cur = match k {
+            Value::String(s) => cur.get_mut(s.as_str())?,
+            Value::Number(n) => cur.get_mut(n.as_u64()? as usize)?,
+            _ => return None,
+        };
+    }
+    Some(cur)
+}
+
+/// Open a file's bytes as File → Open does and evaluate them; any panic is a failure.
+fn try_bytes(bytes: &[u8]) {
+    if let Ok(doc) = solidcraft_engine::io::read_design(bytes) {
+        let mut s = Session::new(doc);
+        let _ = s.execute("inspect.measure", &json!({}));
+        let _ = s.execute("document.inspect", &json!({}));
+    }
+}
+
+/// Hostile shapes that no mutation of a saved file produces: plane references that close a
+/// cycle, which resolve through the model and back into the document.
+fn generated() -> Vec<(String, Vec<u8>)> {
+    let to = |name: &str| json!({"type": "plane", "plane": {"type": "construction", "name": name}});
+    let plane = |id: u64, name: &str, side: Value| {
+        json!({"id": id, "name": name, "suppressed": false, "type": "construction_plane",
+               "plane": {"type": "midplane", "a": side, "b": {"type": "plane", "plane": {"type": "origin", "name": "XZ"}}}})
+    };
+    let design = |name: &str, features: Value| {
+        json!({"format": "solidcraft/11", "name": name, "units": "mm", "params": [], "next_id": 9, "features": features}).to_string().into_bytes()
+    };
+    // A sketch past the caps interactive editing enforces: solving it would size dense matrices
+    // by the point count and abort on the allocation.
+    let point = json!({"id": "p1", "pos": [0.0, 0.0], "fixed": false});
+    let oversized = json!([{"id": 1, "name": "Sketch1", "suppressed": false, "type": "sketch",
+                            "plane": {"type": "origin", "name": "XY"},
+                            "sketch": {"points": vec![point; 200_000], "curves": [], "constraints": []}}]);
+    vec![
+        ("construction plane is its own side".into(), design("selfplane", json!([plane(1, "P1", to("P1"))]))),
+        ("two construction planes refer to each other".into(), design("twoplanes", json!([plane(1, "P1", to("P2")), plane(2, "P2", to("P1"))]))),
+        ("sketch with 200,000 points".into(), design("bigsketch", oversized)),
+    ]
+}
+
+#[test]
+fn damaged_and_hostile_design_files_never_panic() {
+    let mut rng = Rng(0x5eed_cafe_f00d_d00d);
+    // The cases come from one seeded sequence; trying them is independent, so threads share it.
+    let mut all_cases: Vec<(String, String, Vec<u8>)> = Vec::new();
+    for p in corpus() {
+        let name = p.file_name().unwrap_or_default().to_string_lossy().to_string();
+        let bytes = std::fs::read(&p).unwrap();
+        let doc: Value = serde_json::from_slice(&bytes).unwrap();
+        let mut all = Vec::new();
+        paths(&doc, &mut Vec::new(), &mut all);
+        let mut cases: Vec<(String, Vec<u8>)> = Vec::new();
+        // Truncated and bit-flipped files.
+        for _ in 0..8 {
+            let cut = rng.below(bytes.len());
+            cases.push((format!("truncated at {cut}"), bytes[..cut].to_vec()));
+            let mut b = bytes.clone();
+            let i = rng.below(b.len());
+            b[i] ^= 1 << rng.below(8);
+            cases.push((format!("bit flip at {i}"), b));
+        }
+        // Values replaced by hostile ones, and keys removed.
+        for _ in 0..25 {
+            let path = &all[rng.below(all.len())];
+            let mut v = doc.clone();
+            let h = HOSTILE[rng.below(HOSTILE.len())];
+            if let Some(slot) = at_mut(&mut v, path) {
+                *slot = serde_json::from_str(h).unwrap();
+            }
+            cases.push((format!("{path:?} = {h}"), v.to_string().into_bytes()));
+            let mut v = doc.clone();
+            if let Some((last, parent)) = path.split_last()
+                && let (Some(Value::Object(m)), Value::String(k)) = (at_mut(&mut v, parent), last)
+            {
+                m.remove(k);
+            }
+            cases.push((format!("{path:?} removed"), v.to_string().into_bytes()));
+        }
+        // Features repeated many times; deep nesting; not JSON at all.
+        let mut v = doc.clone();
+        if let Some(Value::Array(fs)) = v.get_mut("features") {
+            let copy = fs.clone();
+            for _ in 0..2 {
+                fs.extend(copy.iter().cloned());
+            }
+        }
+        cases.push(("features repeated".into(), v.to_string().into_bytes()));
+        cases.push(("deep nesting".into(), format!("{}{}", "[".repeat(100_000), "]".repeat(100_000)).into_bytes()));
+        cases.push(("binary".into(), (0..4096u32).map(|i| (i.wrapping_mul(2_654_435_761) >> 24) as u8).collect()));
+        all_cases.extend(cases.into_iter().map(|(what, b)| (name.clone(), what, b)));
+    }
+    all_cases.extend(generated().into_iter().map(|(what, b)| ("generated".to_string(), what, b)));
+    let next = std::sync::atomic::AtomicUsize::new(0);
+    let threads = std::thread::available_parallelism().map_or(4, |n| n.get());
+    let failures: Vec<String> = std::thread::scope(|scope| {
+        let workers: Vec<_> = (0..threads)
+            .map(|_| {
+                scope.spawn(|| {
+                    let mut failures = Vec::new();
+                    while let Some((name, what, b)) = all_cases.get(next.fetch_add(1, std::sync::atomic::Ordering::Relaxed)) {
+                        if std::env::var_os("CORPUS_TRACE").is_some() {
+                            eprintln!("{name}: {what}");
+                        }
+                        if std::panic::catch_unwind(|| try_bytes(b)).is_err() {
+                            failures.push(format!("{name}: {what}"));
+                        }
+                    }
+                    failures
+                })
+            })
+            .collect();
+        workers.into_iter().flat_map(|w| w.join().unwrap()).collect()
+    });
+    assert!(failures.is_empty(), "panics:\n{}", failures.join("\n"));
+}

apps/solidcraft-cli/tests/fuzz_range.rs

@@ -0,0 +1,31 @@
+//! Seed ranges must not crash or wrap, including at the last representable seed.
+
+use std::process::Command;
+
+#[test]
+fn overflowing_seed_range_is_an_error_not_a_panic() {
+    let output =
+        Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(["fuzz", "--from", "18446744073709551615", "--count", "2"]).output().unwrap();
+    assert_eq!(output.status.code(), Some(1));
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    assert!(stderr.contains("seed range exceeds u64::MAX"), "{stderr}");
+    assert!(!stderr.contains("panicked"), "{stderr}");
+}
+
+#[test]
+fn empty_seed_range_at_maximum_is_valid() {
+    let output =
+        Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).args(["fuzz", "--from", "18446744073709551615", "--count", "0"]).output().unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    assert!(String::from_utf8_lossy(&output.stdout).starts_with("0 seeds, 0 design steps,"));
+}
+
+#[test]
+fn maximum_seed_runs_once_without_wrapping() {
+    let output = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli"))
+        .args(["fuzz", "--from", "18446744073709551615", "--count", "1", "--steps", "0", "--timeout", "0"])
+        .output()
+        .unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    assert!(String::from_utf8_lossy(&output.stdout).starts_with("1 seeds,"));
+}

apps/solidcraft-cli/tests/kill_mid_save.rs

@@ -0,0 +1,55 @@
+//! Kill the process while it saves: the design file is always the old version or the new one,
+//! whole, and opens.
+
+use std::process::Command;
+use std::time::Duration;
+
+fn round_of(path: &std::path::Path) -> Option<String> {
+    let bytes = std::fs::read(path).ok()?;
+    let doc = solidcraft_engine::io::read_design(&bytes).ok()?;
+    doc.params.iter().find(|p| p.name == "save_round").map(|p| p.expr.clone())
+}
+
+#[test]
+fn killed_mid_save_the_old_file_survives() {
+    let exe = env!("CARGO_BIN_EXE_solidcraft-cli");
+    let dir = std::env::temp_dir().join(format!("solidcraft-kill-mid-save-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(&dir).unwrap();
+    let path = dir.join("design.solidcraft");
+    let ok = Command::new(exe).args(["save-stress", &path.to_string_lossy(), "1"]).status().unwrap();
+    assert!(ok.success());
+    assert_eq!(round_of(&path).as_deref(), Some("0"));
+    let mut kills = 0;
+    let mut seen = std::collections::BTreeSet::new();
+    let modified = || std::fs::metadata(&path).and_then(|m| m.modified()).ok();
+    for i in 0..25u64 {
+        let before = modified();
+        let mut child = Command::new(exe).args(["save-stress", &path.to_string_lossy(), "100000"]).spawn().unwrap();
+        // Wait until it is in its save loop (its first save replaced the file) and has reached a
+        // round that varies from kill to kill, however busy the machine is; then kill it a
+        // varying while later.
+        let target = i % 10;
+        let reached = || modified() != before && round_of(&path).and_then(|r| r.parse::<u64>().ok()).is_some_and(|r| r >= target);
+        let t0 = std::time::Instant::now();
+        while !reached() && t0.elapsed() < Duration::from_secs(20) && child.try_wait().unwrap().is_none() {
+            std::thread::sleep(Duration::from_millis(2));
+        }
+        std::thread::sleep(Duration::from_millis((i * 7) % 30));
+        if child.try_wait().unwrap().is_none() {
+            child.kill().unwrap();
+            kills += 1;
+        }
+        let _ = child.wait();
+        let round = round_of(&path);
+        assert!(round.is_some(), "after kill {i} the design file is torn or missing");
+        seen.insert(round);
+        let bak = solidcraft_engine::io::backup_path(&path);
+        if bak.exists() {
+            assert!(round_of(&bak).is_some(), "after kill {i} the backup is torn");
+        }
+    }
+    assert!(kills > 20, "the saver was killed while running ({kills})");
+    assert!(seen.len() > 5, "the saver got to saving before it was killed ({seen:?})");
+    let _ = std::fs::remove_dir_all(&dir);
+}

apps/solidcraft-cli/tests/legacy_alias.rs

@@ -0,0 +1,20 @@
+//! The `solvecraft-cli` compatibility alias forwards to `solidcraft-cli`.
+use std::process::Command;
+
+#[test]
+fn legacy_alias_forwards_with_a_deprecation_note() {
+    let out = Command::new(env!("CARGO_BIN_EXE_solvecraft-cli")).arg("--version").output().unwrap();
+    assert!(out.status.success(), "{out:?}");
+    let stdout = String::from_utf8_lossy(&out.stdout);
+    assert_eq!(stdout.trim(), format!("solidcraft-cli {}", env!("CARGO_PKG_VERSION")));
+    let stderr = String::from_utf8_lossy(&out.stderr);
+    assert!(stderr.contains("deprecated") && stderr.contains("solidcraft-cli"), "{stderr}");
+}
+
+#[test]
+fn legacy_alias_passes_the_exit_status_through() {
+    let alias = Command::new(env!("CARGO_BIN_EXE_solvecraft-cli")).arg("no-such-command").output().unwrap();
+    let real = Command::new(env!("CARGO_BIN_EXE_solidcraft-cli")).arg("no-such-command").output().unwrap();
+    assert_eq!(alias.status.code(), real.status.code());
+    assert_eq!(alias.stdout, real.stdout);
+}

apps/solidcraft-cli/tests/mcp_connect.rs

@@ -0,0 +1,18 @@
+//! `mcp --connect` to a port where no app listens tells the user how to start one (#270).
+
+use std::net::TcpListener;
+use std::process::{Command, Stdio};
+
+#[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()
+        .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}");
+}

apps/solidcraft-cli/tests/run_results.rs

@@ -0,0 +1,134 @@
+//! Result reporting must not skip requested files or execute a script twice.
+
+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-run-results-{}-{}", std::process::id(), NEXT.fetch_add(1, Ordering::Relaxed)));
+        std::fs::create_dir(&dir).unwrap();
+        Self(dir)
+    }
+
+    fn script(&self) -> PathBuf {
+        let path = self.0.join("box.json");
+        std::fs::write(&path, json!({"commands": [{"command": "solid.box", "params": {"length": 2, "width": 3, "height": 4}}]}).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 json_output(output: Output) -> Value {
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    serde_json::from_slice(&output.stdout).unwrap()
+}
+
+fn body_count(path: &Path) -> Value {
+    json_output(cli().arg("eval").arg(path).output().unwrap())["body_count"].clone()
+}
+
+#[test]
+fn cli_loads_both_design_encodings_by_contents() {
+    let dir = Scratch::new();
+    for extension in ["solidcraft", "solvecraft", "json"] {
+        let saved = dir.0.join(format!("box.{extension}"));
+        json_output(cli().arg("run").arg(dir.script()).arg("--save").arg(&saved).output().unwrap());
+        let bytes = std::fs::read(&saved).unwrap();
+        assert_eq!(solidcraft_engine::io::is_design_container(&bytes), extension != "json");
+        let renamed = dir.0.join(format!("{extension}.unusual"));
+        std::fs::write(&renamed, bytes).unwrap();
+        let measured = json_output(cli().arg("eval").arg(&renamed).output().unwrap());
+        assert_eq!(measured["body_count"], 1);
+        assert!((measured["bodies"][0]["volume_mm3"].as_f64().unwrap() - 24.0).abs() < 1e-6);
+    }
+}
+
+#[test]
+fn results_still_save_and_export_the_script_once() {
+    let dir = Scratch::new();
+    // JSON is explicit here because the fixture edits its saved format tag.
+    let saved = dir.0.join("box.json");
+    let stl = dir.0.join("box.stl");
+    let obj = dir.0.join("box.obj");
+    let result = json_output(
+        cli().arg("run").arg(dir.script()).arg("--results").arg("--save").arg(&saved).arg("--out").arg(&stl).arg("--out").arg(&obj).output().unwrap(),
+    );
+    assert_eq!(result.as_array().unwrap().len(), 1);
+    assert_eq!(body_count(&saved), 1);
+    for exported in [&stl, &obj] {
+        assert!(std::fs::metadata(exported).unwrap().len() > 0);
+        assert_eq!(body_count(exported), 1);
+    }
+}
+
+#[test]
+fn results_with_base_design_and_quiet_still_report_and_save() {
+    let dir = Scratch::new();
+    let script = dir.script();
+    let base = dir.0.join("base.solidcraft");
+    let saved = dir.0.join("combined.solidcraft");
+    json_output(cli().arg("run").arg(&script).arg("--save").arg(&base).output().unwrap());
+    let result = json_output(cli().args(["run", "--results", "--quiet", "--in"]).arg(&base).arg(&script).arg("--save").arg(&saved).output().unwrap());
+    assert_eq!(result.as_array().unwrap().len(), 1);
+    assert_eq!(body_count(&saved), 2);
+    assert_eq!(body_count(&base), 1);
+}
+
+#[test]
+fn results_propagate_output_errors() {
+    let dir = Scratch::new();
+    for flag in ["--save", "--out"] {
+        let path = dir.0.join("missing").join(if flag == "--save" { "box.solidcraft" } else { "box.stl" });
+        let output = cli().arg("run").arg(dir.script()).arg("--results").arg(flag).arg(&path).output().unwrap();
+        assert_eq!(output.status.code(), Some(1));
+        assert!(!output.stderr.is_empty());
+        assert!(output.stdout.is_empty());
+        assert!(!path.exists());
+    }
+}
+
+#[test]
+fn results_without_script_still_fail() {
+    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 output = cli().args(["run", "--results", "--in"]).arg(&base).output().unwrap();
+    assert_eq!(output.status.code(), Some(1));
+    assert!(String::from_utf8_lossy(&output.stderr).contains("--results needs a script"));
+}
+
+/// Compatibility shim (docs/compatibility.md): a design saved before the rename, with the
+/// legacy extension and format tag, still opens; re-saving writes the current tag.
+#[test]
+fn legacy_extension_and_format_tag_still_open() {
+    let dir = Scratch::new();
+    // JSON is explicit here because the fixture edits its saved format tag.
+    let saved = dir.0.join("box.json");
+    json_output(cli().arg("run").arg(dir.script()).arg("--save").arg(&saved).output().unwrap());
+    let text = std::fs::read_to_string(&saved).unwrap();
+    assert!(text.contains("\"solidcraft/"), "new designs carry the current tag");
+    let legacy = dir.0.join("old.solvecraft");
+    std::fs::write(&legacy, text.replace("\"solidcraft/", "\"solvecraft/")).unwrap();
+    assert_eq!(body_count(&legacy), 1);
+    let resaved = dir.0.join("resaved.solidcraft");
+    json_output(cli().args(["run", "--in"]).arg(&legacy).arg(dir.script()).arg("--save").arg(&resaved).output().unwrap());
+    assert_eq!(body_count(&resaved), 2);
+    let reopened = solidcraft_engine::io::read_design(&std::fs::read(&resaved).unwrap()).unwrap();
+    assert!(reopened.to_json().contains("\"solidcraft/"));
+}

apps/solidcraft-cli/tests/run_strict.rs

@@ -0,0 +1,90 @@
+//! A timeline feature that fails fails `run`, and nothing is written: the bodies lack what the
+//! feature should have made, and handing them out with exit 0 hides the failure.
+
+use std::path::PathBuf;
+use std::process::Command;
+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-run-strict-{}-{}", std::process::id(), NEXT.fetch_add(1, Ordering::Relaxed)));
+        std::fs::create_dir(&dir).unwrap();
+        Self(dir)
+    }
+
+    /// 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"))
+}
+
+#[test]
+fn a_failing_feature_fails_the_run_and_writes_nothing() {
+    let dir = Scratch::new();
+    let script = dir.broken_script();
+    let (step, saved) = (dir.0.join("part.step"), dir.0.join("part.solidcraft"));
+    for extra in [&[][..], &["--results"][..], &["--quiet"][..]] {
+        let output = cli().arg("run").arg(&script).args(extra).arg("--out").arg(&step).arg("--save").arg(&saved).output().unwrap();
+        assert_eq!(output.status.code(), Some(1), "{extra:?}");
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert!(stderr.contains("Fillet1") && stderr.contains("nothing was written"), "{stderr}");
+        assert!(output.stdout.is_empty(), "{extra:?}");
+        assert!(!step.exists() && !saved.exists(), "{extra:?}");
+    }
+}
+
+#[test]
+fn allow_errors_writes_anyway_and_a_saved_design_keeps_failing() {
+    let dir = Scratch::new();
+    let (step, saved) = (dir.0.join("part.step"), dir.0.join("part.solidcraft"));
+    let output = cli().arg("run").arg(dir.broken_script()).arg("--allow-errors").arg("--out").arg(&step).arg("--save").arg(&saved).output().unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    let measured: Value = serde_json::from_slice(&output.stdout).unwrap();
+    assert_eq!(measured["total"]["volume_mm3"], json!(4000.0), "the box without its fillet");
+    assert!(std::fs::metadata(&step).unwrap().len() > 0);
+    // The saved design still holds the failing feature: running it fails too, `eval` reports it.
+    let again = dir.0.join("again.step");
+    let output = cli().arg("run").arg(&saved).arg("--out").arg(&again).output().unwrap();
+    assert_eq!(output.status.code(), Some(1));
+    assert!(!again.exists());
+    let output = cli().arg("eval").arg(&saved).output().unwrap();
+    assert!(output.status.success());
+    let report: Value = serde_json::from_slice(&output.stdout).unwrap();
+    assert!(report["timeline"].as_array().unwrap().iter().any(|f| f["error"].is_string()), "{}", report["timeline"]);
+}
+
+#[test]
+fn a_clean_timeline_still_writes() {
+    let dir = Scratch::new();
+    let script = dir.0.join("box.json");
+    std::fs::write(&script, json!({"commands": [{"command": "solid.box", "params": {"length": 2, "width": 3, "height": 4}}]}).to_string()).unwrap();
+    let step = dir.0.join("box.step");
+    let output = cli().arg("run").arg(&script).arg("--out").arg(&step).arg("--quiet").output().unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    assert!(std::fs::metadata(&step).unwrap().len() > 0);
+}

apps/solidcraft-web/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "solidcraft-web"
+description = "SolidCraft in the browser (eframe web runner, WebGPU with WebGL2 fallback)"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+publish = false
+
+[lints]
+workspace = true
+
+[[bin]]
+name = "solidcraft-web"
+path = "src/main.rs"
+
+[dependencies]
+solidcraft-engine = { workspace = true }
+solidcraft-ui-egui = { workspace = true }
+egui = { workspace = true }
+log = { workspace = true }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+eframe = { workspace = true, features = ["default_fonts", "wgpu", "accesskit"] }
+wasm-bindgen = "0.2"
+wasm-bindgen-futures = "0.4"
+js-sys = "0.3"
+serde_json = { workspace = true }
+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",
+] }

apps/solidcraft-web/Trunk.toml

@@ -0,0 +1,10 @@
+# Build with: trunk build --release   (from apps/solidcraft-web)
+[build]
+target = "index.html"
+dist = "../../dist/web"
+public_url = "./"
+filehash = true
+
+[serve]
+addresses = ["127.0.0.1"]
+port = 8781

apps/solidcraft-web/fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2022 The BIZ UDGothic Project Authors (https://github.com/googlefonts/morisawa-biz-ud-mincho)
+
+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:
+https://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.

apps/solidcraft-web/index.html

@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <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://bherbruck.github.io/solidcraft/app/">
+  <meta property="og:image" content="https://bherbruck.github.io/solidcraft/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://bherbruck.github.io/solidcraft/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>
+</head>
+<body>
+  <canvas id="solidcraft_canvas"></canvas>
+  <div id="solidcraft_loading">Loading SolidCraft&hellip;</div>
+</body>
+</html>

apps/solidcraft-web/src/files.rs

@@ -0,0 +1,498 @@
+//! Files in the browser. Designs are kept in the origin private file system (OPFS): read into
+//! 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.
+
+use std::cell::{Cell, RefCell};
+use std::rc::Rc;
+
+use js_sys::{Array, Function, Object, Reflect, Uint8Array};
+use solidcraft_engine::io::vfs;
+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/";
+/// Paths written here are handed to the user as downloads.
+pub const DOWNLOADS: &str = "/downloads/";
+/// Files brought in from the computer.
+pub const UPLOAD: &str = "/upload/";
+/// The autosave of unsaved work (in OPFS: `recovery.solidcraft` and `recovery.json`).
+const RECOVERY: &str = "recovery.solidcraft";
+/// The autosave earlier releases kept (compatibility shim, docs/compatibility.md): recovered
+/// when there is no current one.
+const LEGACY_RECOVERY: &str = "recovery.solvecraft";
+const RECOVERY_META: &str = "recovery.json";
+
+/// What to do with a file brought in from the computer.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Intent {
+    /// Open it (a design, or STEP/mesh as a new design).
+    Open,
+    /// Add its bodies to the open design (STEP, 3MF, STL).
+    Insert,
+}
+
+/// A stored design, as the file panel lists it.
+#[derive(Clone, Debug)]
+pub struct Entry {
+    pub name: String,
+    pub size: u64,
+    /// Last written (ms since 1970; 0 when unknown).
+    pub modified: f64,
+}
+
+/// State shared between the async browser calls and the app's frames.
+#[derive(Default)]
+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)>>,
+    /// Messages for the status line (errors and confirmations).
+    pub messages: RefCell<Vec<(String, bool)>>,
+    /// The stored designs are loaded (the app may open them).
+    pub ready: Cell<bool>,
+    /// The file panel is open.
+    pub panel: Cell<bool>,
+    /// An autosave left by an earlier session: its design's name and file.
+    pub recovery: RefCell<Option<(String, Option<String>)>>,
+    /// The app's context, to wake it when a browser call finishes.
+    pub ctx: RefCell<Option<egui::Context>>,
+}
+
+impl Files {
+    fn say(&self, text: impl Into<String>, error: bool) {
+        self.messages.borrow_mut().push((text.into(), error));
+        self.wake();
+    }
+
+    /// A file arrived from the computer.
+    fn arrive(&self, name: String, bytes: Vec<u8>, intent: Intent) {
+        self.incoming.borrow_mut().push((name, bytes, intent));
+        self.wake();
+    }
+
+    /// Run a frame (the app sleeps until something happens).
+    fn wake(&self) {
+        if let Some(c) = self.ctx.borrow().as_ref() {
+            c.request_repaint();
+        }
+    }
+}
+
+thread_local! {
+    /// The private file system isn't there (an insecure page: http on a network address, or an
+    /// old browser): designs are kept in local storage instead.
+    static LOCAL: Cell<bool> = const { Cell::new(false) };
+}
+
+/// Local storage keys of stored files.
+const LOCAL_PREFIX: &str = "solidcraft.file.";
+/// Local-storage files kept by earlier releases (compatibility shim, docs/compatibility.md):
+/// still listed and opened; removing one removes either key.
+const LEGACY_LOCAL_PREFIX: &str = "solvecraft.file.";
+
+fn local() -> Result<web_sys::Storage, String> {
+    web_sys::window().and_then(|w| w.local_storage().ok().flatten()).ok_or_else(|| "this browser keeps no local storage".to_string())
+}
+
+/// Text as is, anything else as hex (local storage holds strings).
+fn encode(bytes: &[u8]) -> String {
+    match std::str::from_utf8(bytes) {
+        Ok(t) => format!("t{t}"),
+        Err(_) => {
+            let mut s = String::with_capacity(bytes.len() * 2 + 1);
+            s.push('x');
+            for b in bytes {
+                s.push_str(&format!("{b:02x}"));
+            }
+            s
+        }
+    }
+}
+
+fn decode(s: &str) -> Vec<u8> {
+    if let Some(t) = s.strip_prefix('t') {
+        return t.as_bytes().to_vec();
+    }
+    let h = s.strip_prefix('x').unwrap_or("");
+    (0..h.len() / 2).filter_map(|i| h.get(2 * i..2 * i + 2).and_then(|x| u8::from_str_radix(x, 16).ok())).collect()
+}
+
+/// Is the browser's storage local storage (no OPFS here)?
+pub fn local_only() -> bool {
+    LOCAL.with(Cell::get)
+}
+
+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:?}"))
+}
+
+/// The browser's storage manager: missing on insecure pages (http on a network address) and in
+/// old browsers, where calling into it would throw.
+fn storage_manager() -> Option<web_sys::StorageManager> {
+    let nav = web_sys::window()?.navigator();
+    let sm = Reflect::get(&nav, &"storage".into()).ok().filter(|v| v.is_object())?;
+    Some(sm.unchecked_into())
+}
+
+/// Does the storage manager have `method`?
+fn has(sm: &web_sys::StorageManager, method: &str) -> bool {
+    Reflect::get(sm, &method.into()).is_ok_and(|f| f.is_function())
+}
+
+async fn root() -> Result<FileSystemDirectoryHandle, String> {
+    let sm = storage_manager().filter(|sm| has(sm, "getDirectory")).ok_or("this page has no private file storage (it needs https or localhost)")?;
+    let dir = JsFuture::from(sm.get_directory()).await.map_err(err)?;
+    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> {
+    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
+}
+
+async fn blob_bytes(b: &web_sys::Blob) -> Result<Vec<u8>, String> {
+    let buf = JsFuture::from(b.array_buffer()).await.map_err(err)?;
+    Ok(Uint8Array::new(&buf).to_vec())
+}
+
+async fn file_handle(dir: &FileSystemDirectoryHandle, name: &str, create: bool) -> Result<FileSystemFileHandle, String> {
+    let opts = FileSystemGetFileOptions::new();
+    opts.set_create(create);
+    JsFuture::from(dir.get_file_handle_with_options(name, &opts)).await.map_err(err)?.dyn_into().map_err(|_| "not a file".to_string())
+}
+
+async fn write_file(name: &str, bytes: &[u8]) -> Result<(), String> {
+    if local_only() {
+        return local()?
+            .set_item(&format!("{LOCAL_PREFIX}{name}"), &encode(bytes))
+            .map_err(|e| format!("local storage is full or blocked: {}", err(e)));
+    }
+    let dir = root().await?;
+    let h = file_handle(&dir, name, true).await?;
+    let w: FileSystemWritableFileStream =
+        JsFuture::from(h.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 remove_file(name: &str) -> Result<(), String> {
+    if local_only() {
+        let st = local()?;
+        st.remove_item(&format!("{LEGACY_LOCAL_PREFIX}{name}")).map_err(err)?;
+        return st.remove_item(&format!("{LOCAL_PREFIX}{name}")).map_err(err);
+    }
+    let dir = root().await?;
+    JsFuture::from(dir.remove_entry(name)).await.map_err(err)?;
+    Ok(())
+}
+
+/// Every stored file in local storage.
+fn read_local() -> Result<Vec<(String, Vec<u8>, f64)>, String> {
+    let st = local()?;
+    let mut out = Vec::new();
+    for i in 0..st.length().unwrap_or(0).min(10_000) {
+        let Some(k) = st.key(i).ok().flatten() else { continue };
+        let Some(name) = k.strip_prefix(LOCAL_PREFIX).or_else(|| k.strip_prefix(LEGACY_LOCAL_PREFIX)) else { continue };
+        if let Some(v) = st.get_item(&k).ok().flatten() {
+            out.push((name.to_string(), decode(&v), 0.0));
+        }
+    }
+    Ok(out)
+}
+
+/// Every stored file: (name, bytes). Without OPFS, local storage takes over from here on.
+async fn read_all() -> Result<Vec<(String, Vec<u8>, f64)>, String> {
+    let dir = match root().await {
+        Ok(d) => d,
+        Err(e) => {
+            log::warn!("no OPFS ({e}): designs go to local storage");
+            LOCAL.with(|l| l.set(true));
+            return read_local();
+        }
+    };
+    let iter: JsValue = dir.values().into();
+    let next: Function = Reflect::get(&iter, &"next".into()).map_err(err)?.dyn_into().map_err(|_| "no iterator".to_string())?;
+    let mut out = Vec::new();
+    for _ in 0..10_000 {
+        let step = JsFuture::from(js_sys::Promise::resolve(&next.call0(&iter).map_err(err)?)).await.map_err(err)?;
+        if Reflect::get(&step, &"done".into()).ok().and_then(|d| d.as_bool()).unwrap_or(true) {
+            break;
+        }
+        let Ok(h) = Reflect::get(&step, &"value".into()).map_err(err)?.dyn_into::<FileSystemFileHandle>() else { continue };
+        let file =
+            match JsFuture::from(h.get_file()).await.map_err(err).and_then(|f| f.dyn_into::<web_sys::File>().map_err(|_| "not a file".to_string())) {
+                Ok(f) => f,
+                Err(e) => {
+                    log::warn!("{}: {e}", h.name());
+                    continue;
+                }
+            };
+        match blob_bytes(&file).await {
+            Ok(b) => out.push((h.name(), b, file.last_modified())),
+            Err(e) => log::warn!("{}: {e}", h.name()),
+        }
+    }
+    Ok(out)
+}
+
+/// Ask the browser to keep the storage (not evict it under pressure), then load every stored
+/// file into the engine's files.
+pub fn start(files: &Rc<Files>) {
+    if let Some(sm) = storage_manager().filter(|sm| has(sm, "persist"))
+        && let Ok(p) = sm.persist()
+    {
+        spawn_local(async move {
+            let _ = JsFuture::from(p).await;
+        });
+    }
+    let files = files.clone();
+    spawn_local(async move {
+        match read_all().await {
+            Ok(all) => {
+                if local_only() {
+                    files.say("This page can't use the browser's file storage (it needs https or localhost): designs are kept in local storage, a few MB at most.", false);
+                }
+                let mut entries = Vec::new();
+                let has_recovery = all.iter().any(|(n, _, _)| n == RECOVERY);
+                for (name, bytes, modified) in all {
+                    if name == LEGACY_RECOVERY {
+                        if !has_recovery {
+                            vfs::insert(&format!("{OPFS}{RECOVERY}"), bytes);
+                        }
+                        continue;
+                    }
+                    if name == RECOVERY_META {
+                        let meta: serde_json::Value = serde_json::from_slice(&bytes).unwrap_or_default();
+                        let n = meta["name"].as_str().unwrap_or("Untitled").to_string();
+                        *files.recovery.borrow_mut() = Some((n, meta["path"].as_str().map(str::to_string)));
+                        continue;
+                    }
+                    if name != RECOVERY {
+                        entries.push(Entry { name: name.clone(), size: bytes.len() as u64, modified });
+                    }
+                    vfs::insert(&format!("{OPFS}{name}"), bytes);
+                }
+                entries.sort_by_key(|a| a.name.to_lowercase());
+                *files.entries.borrow_mut() = entries;
+                // An autosave without its design file is nothing to recover.
+                if !vfs::exists(&format!("{OPFS}{RECOVERY}")) {
+                    *files.recovery.borrow_mut() = None;
+                }
+            }
+            Err(e) => files.say(format!("browser storage: {e}"), true),
+        }
+        files.ready.set(true);
+        files.wake();
+    });
+}
+
+/// 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());
+                }
+            }
+            let files = files.clone();
+            spawn_local(async move {
+                if let Err(e) = write_file(&name, &bytes).await {
+                    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);
+        }
+    }
+}
+
+/// Hand `bytes` to the user as a download named `name`.
+pub fn download(name: &str, bytes: &[u8]) -> Result<(), String> {
+    let doc = web_sys::window().and_then(|w| w.document()).ok_or("no document")?;
+    let parts = Array::new();
+    parts.push(&Uint8Array::from(bytes));
+    let opts = web_sys::BlobPropertyBag::new();
+    opts.set_type("application/octet-stream");
+    let blob = web_sys::Blob::new_with_u8_array_sequence_and_options(&parts, &opts).map_err(err)?;
+    let url = web_sys::Url::create_object_url_with_blob(&blob).map_err(err)?;
+    let a: web_sys::HtmlAnchorElement = doc.create_element("a").map_err(err)?.dyn_into().map_err(|_| "no anchor".to_string())?;
+    a.set_href(&url);
+    a.set_download(name);
+    a.click();
+    // Let the browser start the download before the URL goes.
+    let revoke = Closure::once_into_js(move || {
+        let _ = web_sys::Url::revoke_object_url(&url);
+    });
+    if let Some(w) = web_sys::window() {
+        let _ = w.set_timeout_with_callback_and_timeout_and_arguments_0(revoke.unchecked_ref(), 10_000);
+    }
+    Ok(())
+}
+
+/// Delete a stored design.
+pub fn delete(files: &Rc<Files>, name: &str) {
+    let _ = vfs::remove(&format!("{OPFS}{name}"));
+    files.entries.borrow_mut().retain(|e| e.name != name);
+    let (files, name) = (files.clone(), name.to_string());
+    spawn_local(async move {
+        if let Err(e) = remove_file(&name).await {
+            files.say(format!("{name}: {e}"), true);
+        }
+    });
+}
+
+/// Rename a stored design (a copy under the new name, then the old one goes: not every browser
+/// can move OPFS files).
+pub fn rename(files: &Rc<Files>, from: &str, to: &str) -> Result<(), String> {
+    let to = to.trim();
+    if to.is_empty() || to.contains('/') || to.contains('\\') || to.len() > 200 {
+        return Err("give a file name without slashes".into());
+    }
+    if files.entries.borrow().iter().any(|e| e.name == to) {
+        return Err(format!("there is already a file named {to}"));
+    }
+    let bytes = vfs::read(&format!("{OPFS}{from}"), solidcraft_engine::io::MAX_DESIGN_BYTES).map_err(|e| e.to_string())?;
+    vfs::write(&format!("{OPFS}{to}"), &bytes).map_err(|e| e.to_string())?;
+    delete(files, from);
+    flush(files);
+    Ok(())
+}
+
+/// Keep (or drop) the autosave of the open design.
+pub fn autosave(files: &Rc<Files>, doc: Option<(&solidcraft_engine::doc::Document, Option<&str>)>) {
+    let files = files.clone();
+    match doc {
+        Some((d, path)) => {
+            let bytes = match solidcraft_engine::io::write_design_container(d) {
+                Ok(bytes) => bytes,
+                Err(e) => {
+                    files.say(format!("autosave: {e}"), true);
+                    return;
+                }
+            };
+            let meta = serde_json::json!({"name": d.name, "path": path, "saved_at": js_sys::Date::now()}).to_string();
+            spawn_local(async move {
+                let r = async {
+                    write_file(RECOVERY, &bytes).await?;
+                    write_file(RECOVERY_META, meta.as_bytes()).await
+                };
+                if let Err(e) = r.await {
+                    files.say(format!("autosave: {e}"), true);
+                }
+            });
+        }
+        None => spawn_local(async move {
+            let _ = remove_file(RECOVERY).await;
+            let _ = remove_file(LEGACY_RECOVERY).await;
+            let _ = remove_file(RECOVERY_META).await;
+        }),
+    }
+}
+
+/// A stored path for `name` that no stored file has: `name`, else `name (2)`, `name (3)`…
+pub fn free_name(name: &str) -> String {
+    let (stem, ext) = name.rsplit_once('.').map(|(s, e)| (s.to_string(), format!(".{e}"))).unwrap_or((name.to_string(), String::new()));
+    for i in 1..1000 {
+        let n = if i == 1 { name.to_string() } else { format!("{stem} ({i}){ext}") };
+        let p = format!("{OPFS}{n}");
+        if !vfs::exists(&p) {
+            return p;
+        }
+    }
+    format!("{OPFS}{stem} ({}){ext}", js_sys::Date::now() as u64)
+}
+
+/// The autosaved design's path (in the engine's files) for opening it.
+pub fn recovery_path() -> String {
+    format!("{OPFS}{RECOVERY}")
+}
+
+/// Pick files on the computer: the File System Access picker where there is one, else an
+/// `<input type=file>`. Read files arrive in `files.incoming`.
+pub fn pick_from_disk(files: &Rc<Files>, intent: Intent) {
+    let Some(window) = web_sys::window() else { return };
+    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);
+            let promise = f.call1(&window, &opts);
+            let files = files.clone();
+            spawn_local(async move {
+                let r = async {
+                    let p: js_sys::Promise = promise.map_err(err)?.dyn_into().map_err(|_| "no promise".to_string())?;
+                    let handles: Array = JsFuture::from(p).await.map_err(err)?.dyn_into().map_err(|_| "no files".to_string())?;
+                    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);
+                    }
+                    Ok::<(), String>(())
+                };
+                match r.await {
+                    Ok(()) => {}
+                    // Closing the picker is no error.
+                    Err(e) if e.contains("abort") || e.contains("Abort") => {}
+                    Err(e) => files.say(format!("open: {e}"), true),
+                }
+            });
+        }
+        None => input_picker(files, intent),
+    }
+}
+
+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");
+    // 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() {
+        let _ = body.append_child(&input);
+    }
+    let (files, el) = (files.clone(), input.clone());
+    let on_change = Closure::once_into_js(move || {
+        el.remove();
+        let Some(list) = el.files() else { return };
+        for i in 0..list.length() {
+            let Some(f) = list.get(i) else { continue };
+            let files = files.clone();
+            spawn_local(async move {
+                match blob_bytes(&f).await {
+                    Ok(b) => files.arrive(f.name(), b, intent),
+                    Err(e) => files.say(format!("{}: {e}", f.name()), true),
+                }
+            });
+        }
+    });
+    input.set_onchange(Some(on_change.unchecked_ref()));
+    input.click();
+}
+
+/// Read files dropped on the page.
+pub fn take_drops(files: &Rc<Files>, raw: &mut egui::RawInput) {
+    for f in std::mem::take(&mut raw.dropped_files) {
+        let files = files.clone();
+        spawn_local(async move {
+            let name = f.path().file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "dropped".into());
+            match f.bytes_async().await {
+                Ok(b) => files.arrive(name, b, Intent::Insert),
+                Err(e) => files.say(format!("{name}: {e}"), true),
+            }
+        });
+    }
+}

apps/solidcraft-web/src/main.rs

@@ -0,0 +1,483 @@
+//! SolidCraft in the browser.
+//!
+//! 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.
+#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
+
+#[cfg(target_arch = "wasm32")]
+mod files;
+
+#[cfg(target_arch = "wasm32")]
+mod web {
+    use std::rc::Rc;
+
+    use solidcraft_engine::Session;
+    use solidcraft_engine::io::vfs;
+    use solidcraft_ui_egui::{Services, SolveApp};
+    use wasm_bindgen::JsCast as _;
+
+    use crate::files::{self, Files, Intent};
+
+    const CANVAS_ID: &str = "solidcraft_canvas";
+    const LOADING_ID: &str = "solidcraft_loading";
+    const DEPTH_BITS: u8 = 24;
+
+    /// Seconds between autosaves of unsaved work.
+    const AUTOSAVE_S: f64 = 30.0;
+
+    thread_local! {
+        /// An open design has unsaved changes: leaving the page asks first.
+        static UNSAVED: std::cell::Cell<bool> = const { std::cell::Cell::new(false) };
+    }
+
+    /// The browser's "leave site? changes you made may not be saved" prompt while a design has
+    /// unsaved changes (the page can't show its own dialog when it is being closed).
+    fn ask_before_unload(window: &web_sys::Window) {
+        let on_unload = wasm_bindgen::closure::Closure::<dyn FnMut(web_sys::BeforeUnloadEvent)>::new(|e: web_sys::BeforeUnloadEvent| {
+            if UNSAVED.with(std::cell::Cell::get) {
+                e.prevent_default();
+                e.set_return_value("unsaved");
+            }
+        });
+        let _ = window.add_event_listener_with_callback("beforeunload", on_unload.as_ref().unchecked_ref());
+        // The listener lives as long as the page.
+        on_unload.forget();
+    }
+
+    const JAPANESE_FONT_PATH: &str = "./fonts/BIZUDPGothic-Regular.ttf";
+
+    type FontLoadResult = Rc<std::cell::RefCell<Option<Result<Vec<u8>, String>>>>;
+
+    struct Shell {
+        app: SolveApp,
+        files: Rc<Files>,
+        /// When the last autosave was (seconds), and the revision it holds (none stored: `None`).
+        autosaved_at: f64,
+        autosaved: Option<u64>,
+        /// A stored design being renamed: (its name, the new name).
+        renaming: Option<(String, String)>,
+        /// The rename field takes the keyboard when it appears.
+        rename_focus: bool,
+        /// The start page's recent designs were filled from the stored ones.
+        recents_synced: bool,
+        /// On-demand CJK font: fetched only when a CJK language is selected.
+        font: solidcraft_ui_egui::fonts::CjkFontLoader,
+        font_result: FontLoadResult,
+    }
+
+    impl Shell {
+        /// Files from the computer, writes to store, messages and the autosave.
+        fn files_tick(&mut self, ctx: &egui::Context) {
+            if self.files.ctx.borrow().is_none() {
+                *self.files.ctx.borrow_mut() = Some(ctx.clone());
+            }
+            files::flush(&self.files);
+            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();
+            for (name, bytes, intent) in incoming {
+                let design = solidcraft_engine::io::is_design_path(&name);
+                let path = if design && intent == Intent::Open {
+                    // A design from the computer is kept in the browser (a copy), so Save works.
+                    let path = files::free_name(&name);
+                    if let Err(e) = vfs::write(&path, &bytes) {
+                        self.app.set_status(e.to_string(), true);
+                    }
+                    files::flush(&self.files);
+                    path
+                } else {
+                    let path = format!("{}{name}", files::UPLOAD);
+                    vfs::insert(&path, bytes);
+                    path
+                };
+                match intent {
+                    Intent::Open => self.app.open_path(&path),
+                    Intent::Insert => self.app.drop_path(&path),
+                }
+                self.files.panel.set(false);
+            }
+            if self.files.ready.get() && !self.recents_synced {
+                self.recents_synced = true;
+                self.sync_recents();
+            }
+            let now = ctx.input(|i| i.time);
+            // Unsaved work is kept (at most every AUTOSAVE_S); saved work needs no autosave.
+            if self.files.ready.get() && self.files.recovery.borrow().is_none() {
+                let s = &self.app.session;
+                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())));
+                    self.autosaved = Some(s.revision);
+                    self.autosaved_at = now;
+                } else if changed {
+                    // Come back for it even when nothing else happens.
+                    ctx.request_repaint_after(std::time::Duration::from_secs_f64(wait));
+                } else if !s.is_dirty() && self.autosaved.is_some() {
+                    files::autosave(&self.files, None);
+                    self.autosaved = None;
+                }
+            }
+            if !self.files.ready.get() || !self.files.incoming.borrow().is_empty() {
+                ctx.request_repaint_after(std::time::Duration::from_millis(100));
+            }
+        }
+
+        /// The start page's recent designs are the stored ones: the remembered order first (those
+        /// still stored), then the others, newest first.
+        fn sync_recents(&mut self) {
+            let mut entries = self.files.entries.borrow().clone();
+            entries.sort_by(|a, b| b.modified.total_cmp(&a.modified));
+            let recent = &mut self.app.home.recent;
+            recent.retain(|p| vfs::exists(p));
+            for e in entries.iter().filter(|e| solidcraft_engine::io::is_design_path(&e.name)) {
+                let p = format!("{}{}", files::OPFS, e.name);
+                if !recent.contains(&p) {
+                    recent.push(p);
+                }
+            }
+            recent.truncate(solidcraft_ui_egui::home::MAX_RECENT);
+        }
+
+        /// The stored designs: open, insert, rename, delete, download; open from the computer.
+        fn file_panel(&mut self, ctx: &egui::Context) {
+            if !self.files.panel.get() {
+                return;
+            }
+            let mut open = true;
+            let mut act: Option<(&'static str, String)> = None;
+            egui::Window::new("Files in this browser")
+                .open(&mut open)
+                .collapsible(false)
+                .resizable(true)
+                .default_width(520.0)
+                .pivot(egui::Align2::CENTER_CENTER)
+                .default_pos(ctx.content_rect().center())
+                .show(ctx, |ui| {
+                    ui.horizontal(|ui| {
+                        if ui.button("Open from computer…").clicked() {
+                            files::pick_from_disk(&self.files, Intent::Open);
+                        }
+                        if ui.button("Insert from computer…").on_hover_text("STEP, 3MF or STL into the open design").clicked() {
+                            files::pick_from_disk(&self.files, Intent::Insert);
+                        }
+                        if ui.button("Download open design").clicked() {
+                            act = Some(("download_open", String::new()));
+                        }
+                    });
+                    ui.separator();
+                    if !self.files.ready.get() {
+                        ui.horizontal(|ui| {
+                            ui.spinner();
+                            ui.label("Reading the browser's storage…");
+                        });
+                        return;
+                    }
+                    let entries = self.files.entries.borrow().clone();
+                    if entries.is_empty() {
+                        ui.label("Designs you save appear here. They stay in this browser.");
+                    }
+                    egui::ScrollArea::vertical().max_height(360.0).show(ui, |ui| {
+                        egui::Grid::new("opfs_files").num_columns(3).spacing([12.0, 6.0]).show(ui, |ui| {
+                            for e in &entries {
+                                match &mut self.renaming {
+                                    Some((from, to)) if *from == e.name => {
+                                        let r = ui.add(egui::TextEdit::singleline(to).desired_width(200.0));
+                                        if std::mem::take(&mut self.rename_focus) {
+                                            r.request_focus();
+                                        }
+                                        if r.lost_focus() {
+                                            act = Some(if ui.input(|i| i.key_pressed(egui::Key::Enter)) {
+                                                ("rename", to.clone())
+                                            } else {
+                                                ("rename_cancel", String::new())
+                                            });
+                                        }
+                                    }
+                                    _ => {
+                                        ui.label(&e.name);
+                                    }
+                                }
+                                ui.label(format!("{:.1} KB", e.size as f64 / 1024.0));
+                                ui.horizontal(|ui| {
+                                    if ui.small_button("Open").clicked() {
+                                        act = Some(("open", e.name.clone()));
+                                    }
+                                    let design = solidcraft_engine::io::is_design_path(&e.name);
+                                    if !design && ui.small_button("Insert").on_hover_text("Into the open design (STEP, 3MF, STL)").clicked() {
+                                        act = Some(("insert", e.name.clone()));
+                                    }
+                                    if ui.small_button("Rename").clicked() {
+                                        self.renaming = Some((e.name.clone(), e.name.clone()));
+                                        self.rename_focus = true;
+                                    }
+                                    if ui.small_button("Download").clicked() {
+                                        act = Some(("download", e.name.clone()));
+                                    }
+                                    if ui.small_button("Delete").clicked() {
+                                        act = Some(("delete", e.name.clone()));
+                                    }
+                                });
+                                ui.end_row();
+                            }
+                        });
+                    });
+                });
+            if !open {
+                self.files.panel.set(false);
+                self.renaming = None;
+            }
+            let Some((what, name)) = act else { return };
+            let path = format!("{}{name}", files::OPFS);
+            match what {
+                "open" => {
+                    self.app.open_path(&path);
+                    self.files.panel.set(false);
+                }
+                "insert" => {
+                    self.app.insert_path(&path);
+                    self.files.panel.set(false);
+                }
+                "download" => match vfs::read(&path, solidcraft_engine::io::MAX_DESIGN_BYTES) {
+                    Ok(b) => {
+                        if let Err(e) = files::download(&name, &b) {
+                            self.app.set_status(e, true);
+                        }
+                    }
+                    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)
+                        .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 {
+                        self.app.set_status(e, true);
+                    }
+                }
+                "delete" => {
+                    files::delete(&self.files, &name);
+                    self.app.home.recent.retain(|r| *r != path);
+                }
+                "rename_cancel" => self.renaming = None,
+                "rename" => {
+                    if let Some((from, _)) = self.renaming.take() {
+                        match files::rename(&self.files, &from, &name) {
+                            Ok(()) => {
+                                // Recent designs follow the new name.
+                                let (old, new) = (format!("{}{from}", files::OPFS), format!("{}{name}", files::OPFS));
+                                for r in &mut self.app.home.recent {
+                                    if *r == old {
+                                        *r = new.clone();
+                                    }
+                                }
+                            }
+                            Err(e) => self.app.set_status(e, true),
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        /// Offer the autosave an earlier session left.
+        fn recovery_prompt(&mut self, ctx: &egui::Context) {
+            let Some((name, path)) = self.files.recovery.borrow().clone() else { return };
+            let mut answer = None;
+            egui::Window::new("Recover unsaved work?").collapsible(false).resizable(false).anchor(egui::Align2::CENTER_CENTER, [0.0, 0.0]).show(
+                ctx,
+                |ui| {
+                    ui.label(format!("“{name}” had unsaved changes when this page last closed."));
+                    ui.horizontal(|ui| {
+                        if ui.button("Recover").clicked() {
+                            answer = Some(true);
+                        }
+                        if ui.button("Discard").clicked() {
+                            answer = Some(false);
+                        }
+                    });
+                },
+            );
+            let Some(recover) = answer else { return };
+            *self.files.recovery.borrow_mut() = None;
+            if recover {
+                self.app.open_path(&files::recovery_path());
+                // It belongs to its own file again (saving goes there); it is unsaved.
+                self.app.session.path = path;
+                self.app.session.doc_mut().name = name;
+                self.app.session.mark_unsaved();
+                self.app.home.open = false;
+            }
+            files::autosave(&self.files, None);
+        }
+
+        /// Fetch and install the CJK font when a CJK language is selected. If that fails, this
+        /// session falls back to English (no tofu); the saved language preference is kept.
+        fn tick_font(&mut self, ctx: &egui::Context) {
+            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),
+                    Err(err) => {
+                        log::warn!("failed to fetch CJK font from {JAPANESE_FONT_PATH}: {err}");
+                        false
+                    }
+                };
+                if installed {
+                    log::info!("loaded web CJK font from {JAPANESE_FONT_PATH}");
+                } else {
+                    log::warn!("CJK font unavailable; showing English for this session");
+                }
+                self.font.finished(installed, &mut self.app.preferences.language);
+                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();
+                });
+            }
+        }
+    }
+
+    impl eframe::App for Shell {
+        fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+            self.tick_font(ctx);
+            self.app.logic(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) {
+            files::take_drops(&self.files, raw);
+            self.app.raw_input_hook(raw);
+        }
+        fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
+            self.app.ui(ui);
+            let ctx = ui.ctx().clone();
+            self.file_panel(&ctx);
+            self.recovery_prompt(&ctx);
+        }
+        fn save(&mut self, storage: &mut dyn eframe::Storage) {
+            // Persist the user's own language, not a session-only English fallback.
+            let saved = self.font.persisted_language(&self.app.preferences.language).to_owned();
+            let live = std::mem::replace(&mut self.app.preferences.language, saved);
+            storage.set_string(solidcraft_ui_egui::prefs::STORAGE_KEY, self.app.prefs());
+            self.app.preferences.language = live;
+        }
+    }
+
+    fn query() -> String {
+        web_sys::window().and_then(|w| w.location().search().ok()).unwrap_or_default()
+    }
+
+    /// 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")?;
+        let resp_val = wasm_bindgen_futures::JsFuture::from(window.fetch_with_str(url)).await.map_err(|e| format!("{e:?}"))?;
+        let resp: web_sys::Response = resp_val.dyn_into().map_err(|_| "response cast failed")?;
+        if !resp.ok() {
+            return Err(format!("HTTP {}", resp.status()));
+        }
+        let ab_val = wasm_bindgen_futures::JsFuture::from(resp.array_buffer().map_err(|e| format!("{e:?}"))?).await.map_err(|e| format!("{e:?}"))?;
+        let uint8_arr = js_sys::Uint8Array::new(&ab_val);
+        Ok(uint8_arr.to_vec())
+    }
+
+    pub fn start() {
+        eframe::WebLogger::init(log::LevelFilter::Info).ok();
+        wasm_bindgen_futures::spawn_local(async {
+            let Some(window) = web_sys::window() else { return };
+            ask_before_unload(&window);
+            let Some(document) = window.document() else { return };
+            let Some(canvas) = document.get_element_by_id(CANVAS_ID).and_then(|e| e.dyn_into::<web_sys::HtmlCanvasElement>().ok()) else {
+                log::error!("missing <canvas id=\"{CANVAS_ID}\">");
+                return;
+            };
+            let mut options = eframe::WebOptions { depth_buffer: DEPTH_BITS, ..Default::default() };
+            if query().contains("webgl")
+                && let eframe::egui_wgpu::WgpuSetup::CreateNew(create) = &mut options.wgpu_options.wgpu_setup
+            {
+                create.instance_descriptor.backends = eframe::wgpu::Backends::GL;
+            }
+            let result = eframe::WebRunner::new()
+                .start(
+                    canvas,
+                    options,
+                    Box::new(move |cc| {
+                        solidcraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
+                        let files = Rc::new(Files::default());
+                        files::start(&files);
+                        let panel = files.clone();
+                        let services = Services {
+                            // Open shows the browser's files (and the computer's, from there).
+                            pick_open: Some(Box::new(move || {
+                                panel.panel.set(true);
+                                None
+                            })),
+                            // Designs are kept in the browser; everything else is downloaded.
+                            pick_save: Some(Box::new(|name: &str, exts: &[&str]| {
+                                let design = exts.contains(&solidcraft_engine::io::DESIGN_EXT);
+                                Some(format!("{}{name}", if design { files::OPFS } else { files::DOWNLOADS }))
+                            })),
+                            ..Default::default()
+                        };
+                        let mut app = SolveApp::new(Session::default(), services);
+                        if let Some(p) = cc.storage.and_then(|s| solidcraft_ui_egui::prefs::stored(|k| s.get_string(k))) {
+                            app.load_prefs(&p);
+                        }
+                        if let Some(rs) = &cc.wgpu_render_state {
+                            // eframe's web painter has no stencil buffer.
+                            app.set_wgpu(rs, DEPTH_BITS, 0, 1);
+                        }
+                        if query().contains("sample") {
+                            if let Err(e) = app.session.run_script(&solidcraft_engine::sample::script()) {
+                                app.set_status(format!("sample: {e}"), true);
+                            }
+                            app.session.doc_mut().name = "Sample Plate".into();
+                            app.session.mark_saved();
+                        }
+                        if !query().contains("sample") {
+                            let rev = app.session.revision;
+                            app.home.show(rev);
+                        }
+                        Ok(Box::new(Shell {
+                            app,
+                            files,
+                            autosaved_at: f64::NEG_INFINITY,
+                            autosaved: None,
+                            renaming: None,
+                            rename_focus: false,
+                            recents_synced: false,
+                            font: Default::default(),
+                            font_result: Rc::new(std::cell::RefCell::new(None)),
+                        }))
+                    }),
+                )
+                .await;
+            if let Some(el) = document.get_element_by_id(LOADING_ID) {
+                match result {
+                    Ok(()) => el.remove(),
+                    Err(e) => {
+                        el.set_inner_html(&format!("<p>SolidCraft failed to start: {e:?}</p><p>A browser with WebGPU or WebGL2 is required.</p>"))
+                    }
+                }
+            }
+        });
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    web::start();
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+fn main() {
+    eprintln!("solidcraft-web only runs in the browser: build it with `trunk build --release` in apps/solidcraft-web");
+}

apps/solidcraft/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "solidcraft"
+description = "SolidCraft desktop app"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+publish = false
+default-run = "solidcraft"
+
+[lints]
+workspace = true
+
+[dependencies]
+solidcraft-engine = { workspace = true }
+solidcraft-ui-egui = { 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 }
+
+[target.'cfg(any(target_os = "windows", target_os = "linux"))'.dependencies]
+quick-xml = { workspace = true }
+
+[target.'cfg(target_os = "windows")'.dependencies]
+hidapi = { version = "2.6.7", default-features = false, features = ["windows-native"] }
+
+[target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
+winit = { version = "0.30", default-features = false, features = ["x11"] }
+
+[build-dependencies]
+embed-resource = "3.0.11"

apps/solidcraft/build.rs

@@ -0,0 +1,61 @@
+#![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");
+    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 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.
+    embed_resource::compile_for(&rc, ["solidcraft"], embed_resource::NONE).manifest_required()?;
+    Ok(())
+}

apps/solidcraft/src/control_server.rs

@@ -0,0 +1,170 @@
+//! Loopback JSON-lines control server: one request per line, one reply per line.
+//! Agents and tests drive the app through it (adapted from CADCraft, MIT OR Apache-2.0).
+
+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::time::Duration;
+
+use serde_json::{Value, json};
+use solidcraft_engine::MAX_LINE;
+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.
+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);
+
+pub fn start(port: u16, ctx: egui::Context) -> Receiver<ControlRequest> {
+    let (tx, rx) = channel::<ControlRequest>();
+    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;
+        }
+    };
+    eprintln!("solidcraft: control server listening on 127.0.0.1:{port}");
+    std::thread::spawn(move || {
+        for stream in listener.incoming().flatten() {
+            if OPEN.fetch_add(1, Ordering::Relaxed) >= MAX_CONNECTIONS {
+                OPEN.fetch_sub(1, Ordering::Relaxed);
+                let mut refused = stream;
+                let _ = writeln!(refused, "{}", json!({"ok": false, "error": "too many connections"}));
+                continue;
+            }
+            let tx = tx.clone();
+            let ctx = ctx.clone();
+            std::thread::spawn(move || {
+                serve(stream, tx, ctx);
+                OPEN.fetch_sub(1, Ordering::Relaxed);
+            });
+        }
+    });
+    rx
+}
+
+/// One line without its newline, or `None` at the end of the stream. A client that sends
+/// gigabytes with no newline would otherwise make this thread allocate until the process is
+/// killed, so the line is refused as soon as it passes `max`.
+fn read_line(r: &mut impl BufRead, max: usize) -> std::io::Result<Option<Vec<u8>>> {
+    let mut line = Vec::new();
+    loop {
+        let (done, used) = {
+            let available = r.fill_buf()?;
+            if available.is_empty() {
+                return Ok((!line.is_empty()).then_some(line));
+            }
+            match available.iter().position(|b| *b == b'\n') {
+                Some(i) => {
+                    line.extend_from_slice(available.get(..i).unwrap_or(&[]));
+                    (true, i + 1)
+                }
+                None => {
+                    line.extend_from_slice(available);
+                    (false, available.len())
+                }
+            }
+        };
+        r.consume(used);
+        if done {
+            return Ok(Some(line));
+        }
+        if line.len() > max {
+            return Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "request too large"));
+        }
+    }
+}
+
+fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
+    let Ok(read) = stream.try_clone() else { return };
+    let mut out = stream;
+    let mut reader = BufReader::new(read);
+    let mut bad = 0usize;
+    loop {
+        let line = match read_line(&mut reader, MAX_LINE) {
+            Ok(Some(l)) => String::from_utf8_lossy(&l).into_owned(),
+            Ok(None) => break,
+            Err(e) => {
+                let _ = writeln!(out, "{}", json!({"ok": false, "error": e.to_string()}));
+                break;
+            }
+        };
+        if line.trim().is_empty() {
+            continue;
+        }
+        let reply = match serde_json::from_str::<Value>(&line) {
+            Ok(msg) => {
+                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"}));
+                if let Some(o) = r.as_object_mut() {
+                    o.insert("id".into(), id);
+                }
+                r
+            }
+            Err(e) => {
+                bad += 1;
+                json!({"ok": false, "error": format!("bad JSON: {e}")})
+            }
+        };
+        if writeln!(out, "{reply}").is_err() {
+            break;
+        }
+        if bad >= MAX_BAD_LINES {
+            break;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// A request longer than the cap is refused instead of allocated.
+    #[test]
+    fn lines_past_the_cap_are_refused() {
+        let flood = vec![b'A'; MAX_LINE + 2];
+        let mut r = BufReader::new(flood.as_slice());
+        let e = read_line(&mut r, MAX_LINE).unwrap_err();
+        assert_eq!(e.kind(), std::io::ErrorKind::InvalidData);
+        assert!(e.to_string().contains("request too large"), "{e}");
+    }
+
+    /// Ordinary framing: lines split on newlines, blank lines kept, no trailing newline needed.
+    #[test]
+    fn lines_split_on_newlines() {
+        let text = b"{\"a\":1}\n\n{\"b\":2}\nlast".to_vec();
+        let mut r = BufReader::new(text.as_slice());
+        let mut got = Vec::new();
+        while let Some(line) = read_line(&mut r, MAX_LINE).unwrap() {
+            got.push(String::from_utf8(line).unwrap());
+        }
+        assert_eq!(got, vec!["{\"a\":1}", "", "{\"b\":2}", "last"]);
+        assert!(read_line(&mut r, MAX_LINE).unwrap().is_none());
+    }
+
+    /// A line that spans several reads of the underlying stream still arrives whole.
+    #[test]
+    fn lines_longer_than_one_buffer_arrive_whole() {
+        let long = "x".repeat(200_000);
+        let text = format!("{long}\n{long}\n").into_bytes();
+        let mut r = BufReader::with_capacity(64, text.as_slice());
+        assert_eq!(read_line(&mut r, MAX_LINE).unwrap().unwrap().len(), long.len());
+        assert_eq!(read_line(&mut r, MAX_LINE).unwrap().unwrap().len(), long.len());
+        assert!(read_line(&mut r, MAX_LINE).unwrap().is_none());
+        // The same line against a smaller cap is refused.
+        let mut r = BufReader::with_capacity(64, text.as_slice());
+        assert!(read_line(&mut r, 1000).is_err());
+    }
+}

apps/solidcraft/src/main.rs

@@ -0,0 +1,434 @@
+//! SolidCraft desktop app.
+//!
+//! Usage: `solidcraft [--control <port>] [--sample] [--crash-log] [design.solidcraft | part.step]`
+//!
+//! 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.
+//!
+//! `--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)]
+
+#[cfg(not(target_os = "macos"))]
+#[path = "../../app_icon.rs"]
+mod app_icon;
+mod control_server;
+#[cfg(any(target_os = "windows", target_os = "linux"))]
+mod space_mouse;
+
+use solidcraft_engine::{Session, io};
+use solidcraft_ui_egui::{Services, SolveApp};
+
+struct App {
+    solve: SolveApp,
+    #[cfg(any(target_os = "windows", target_os = "linux"))]
+    space_mouse: space_mouse::SpaceMouse,
+}
+
+impl eframe::App for App {
+    fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        // 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
+        // designs first; the window closes once they are answered (`quit_requested`).
+        if ctx.input(|i| i.viewport().close_requested()) && !self.solve.quit_requested {
+            ctx.send_viewport_cmd(egui::ViewportCommand::CancelClose);
+            solidcraft_ui_egui::documents::request_quit(&mut self.solve);
+        }
+        self.solve.logic(ctx);
+        #[cfg(any(target_os = "windows", target_os = "linux"))]
+        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) {
+        self.solve.raw_input_hook(raw);
+    }
+    fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
+        self.solve.ui(ui);
+    }
+    fn save(&mut self, storage: &mut dyn eframe::Storage) {
+        storage.set_string(solidcraft_ui_egui::prefs::STORAGE_KEY, self.solve.prefs());
+    }
+    fn on_exit(&mut self) {
+        solidcraft_ui_egui::recovery_ui::close(&mut self.solve);
+        solidcraft_engine::crash::end_session();
+    }
+}
+
+fn services() -> Services {
+    Services {
+        pick_open: Some(Box::new(|| {
+            rfd::FileDialog::new()
+                .add_filter(
+                    "Designs, STEP, IGES and meshes",
+                    &[
+                        io::DESIGN_EXT,
+                        io::LEGACY_DESIGN_EXT,
+                        "json",
+                        "step",
+                        "stp",
+                        "STEP",
+                        "STP",
+                        "igs",
+                        "iges",
+                        "IGS",
+                        "IGES",
+                        "3mf",
+                        "3MF",
+                        "stl",
+                        "STL",
+                    ],
+                )
+                .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("Sketch drawings (DXF, SVG)", &["dxf", "DXF", "svg", "SVG"])
+                .add_filter("All files", &["*"])
+                .pick_file()
+                .map(|p| p.to_string_lossy().to_string())
+        })),
+        pick_save: Some(Box::new(|name: &str, exts: &[&str]| {
+            let dialog = rfd::FileDialog::new().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])
+                } else {
+                    dialog.add_filter("SolidCraft container", &[io::DESIGN_EXT]).add_filter("Plain JSON design", &["json"])
+                }
+            } else {
+                dialog.add_filter("File", exts)
+            };
+            dialog.save_file().map(|p| p.to_string_lossy().to_string())
+        })),
+        graphics_path: graphics_path().map(|p| p.to_string_lossy().to_string()),
+        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") {
+                "explorer"
+            } else if cfg!(target_os = "macos") {
+                "open"
+            } else {
+                "xdg-open"
+            });
+            command.arg(folder);
+            #[cfg(target_os = "windows")]
+            {
+                use std::os::windows::process::CommandExt;
+                command.creation_flags(0x08000000);
+            }
+            let _ = command.spawn();
+        })),
+    }
+}
+
+/// 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")
+}
+
+/// The anti-aliasing preference, kept next to eframe's storage (it is needed before the
+/// window opens).
+fn graphics_path() -> Option<std::path::PathBuf> {
+    settings_dir().map(|d| d.join("graphics.json"))
+}
+
+/// 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.
+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()) {
+        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<()> {
+    let fresh = !current.exists();
+    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)?;
+        let new = current.join("app.ron");
+        if !new.exists() {
+            std::fs::copy(old, new)?;
+        }
+    }
+    Ok(())
+}
+
+/// 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())
+        .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))
+        .unwrap_or(MSAA)
+}
+
+/// Windows and Linux: no OS title bar; the application bar is the title bar
+/// (`solidcraft_ui_egui::titlebar`). macOS keeps its traffic lights over the integrated bar.
+const CUSTOM_TITLEBAR: bool = !cfg!(target_os = "macos");
+
+const DEPTH_BITS: u8 = 24;
+/// The section cap marks where it shows in the stencil.
+const STENCIL_BITS: u8 = 8;
+const MSAA: u16 = 4;
+
+fn app_viewport() -> Result<egui::ViewportBuilder, eframe::Error> {
+    // Let macOS use the bundle's layered icon; eframe's default bitmap would replace it.
+    #[cfg(target_os = "macos")]
+    let icon = egui::IconData::default();
+    #[cfg(not(target_os = "macos"))]
+    let icon =
+        egui::IconData { rgba: app_icon::rgba(64).map_err(|e| eframe::Error::AppCreation(std::io::Error::other(e).into()))?, width: 64, height: 64 };
+    Ok(egui::ViewportBuilder::default()
+        .with_title("SolidCraft")
+        .with_icon(icon)
+        .with_inner_size([1600.0, 1000.0])
+        .with_min_inner_size([960.0, 600.0])
+        .with_drag_and_drop(true)
+        .with_decorations(!CUSTOM_TITLEBAR)
+        .with_fullsize_content_view(true)
+        .with_titlebar_shown(false)
+        .with_title_shown(false)
+        .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";
+
+fn main() -> eframe::Result {
+    adopt_legacy_settings();
+    let samples = msaa();
+    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;
+    let mut args = std::env::args().skip(1);
+    while let Some(a) = args.next() {
+        match a.as_str() {
+            "--control" => control_port = args.next().and_then(|p| p.parse().ok()),
+            "--sample" => sample = true,
+            "--version" | "-V" => {
+                println!("solidcraft {}", env!("CARGO_PKG_VERSION"));
+                return Ok(());
+            }
+            "--crash-log" => {
+                match solidcraft_engine::crash::default_dir() {
+                    Some(dir) => {
+                        println!("crash reports: {}", dir.display());
+                        for r in solidcraft_engine::crash::list(&dir).iter().take(5) {
+                            println!("  {}  {}  {}", r.id, r.kind, r.message);
+                        }
+                        println!("more: solidcraft-cli crashes");
+                    }
+                    None => println!("no crash folder on this system"),
+                }
+                return Ok(());
+            }
+            "--help" | "-h" => {
+                println!("usage: solidcraft [--control PORT] [--sample] [--crash-log] [design.solidcraft | part.step]");
+                return Ok(());
+            }
+            _ => files.push(a),
+        }
+    }
+    // Crashes leave a report in the crash folder (solidcraft_engine::crash, docs/crash-reports.md).
+    let crashed = solidcraft_engine::crash::default_dir()
+        .map(|dir| {
+            let build = solidcraft_engine::crash::Build {
+                version: solidcraft_ui_egui::help::VERSION,
+                commit: solidcraft_ui_egui::help::COMMIT,
+                built: solidcraft_ui_egui::help::BUILD_DATE,
+            };
+            solidcraft_engine::crash::install(dir, build)
+        })
+        .unwrap_or_default();
+    let options = eframe::NativeOptions {
+        viewport: app_viewport()?,
+        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")),
+        ..Default::default()
+    };
+    #[cfg(all(unix, not(target_os = "macos")))]
+    let mut options = options;
+    #[cfg(all(unix, not(target_os = "macos")))]
+    if prefer_x11(
+        std::env::var_os("DISPLAY").is_some(),
+        std::env::var_os("WAYLAND_DISPLAY").is_some(),
+        std::env::var("XDG_CURRENT_DESKTOP").ok().as_deref(),
+        solidcraft_engine::geom::env::var("WAYLAND").as_deref(),
+    ) {
+        options.event_loop_builder = Some(Box::new(|b| {
+            use winit::platform::x11::EventLoopBuilderExtX11;
+            b.with_x11();
+        }));
+    }
+    eframe::run_native(
+        "SolidCraft",
+        options,
+        Box::new(move |cc| {
+            solidcraft_ui_egui::fonts::setup_fonts(&cc.egui_ctx);
+            let mut app = SolveApp::new(Session::default(), services());
+            app.custom_titlebar = CUSTOM_TITLEBAR;
+            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.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);
+                // 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();
+                solidcraft_engine::crash::set_environment(&format!(
+                    "Renderer: {:?} {} ({}), MSAA {}x",
+                    info.backend, info.name, info.driver, rs.msaa_samples
+                ));
+            }
+            if let Some(port) = control_port {
+                let rx = control_server::start(port, cc.egui_ctx.clone());
+                app = app.with_control(rx);
+            }
+            if sample {
+                if let Err(e) = app.session.run_script(&solidcraft_engine::sample::script()) {
+                    app.set_status(format!("sample: {e}"), true);
+                }
+                app.session.doc_mut().name = "Sample Plate".into();
+                app.session.mark_saved();
+                app.session.undo.clear();
+            }
+            for f in &files {
+                app.open_path_async(f);
+            }
+            // 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() {
+                let rev = app.session.revision;
+                app.home.show(rev);
+            }
+            // Autosave, and offer what crashed sessions left behind.
+            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)));
+            }
+            // 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"))]
+            let space_mouse = space_mouse::SpaceMouse::start(&cc.egui_ctx);
+            Ok(Box::new(App {
+                solve: app,
+                #[cfg(any(target_os = "windows", target_os = "linux"))]
+                space_mouse,
+            }))
+        }),
+    )
+}
+
+/// Whether to run through XWayland rather than native Wayland. winit has no file drag-and-drop
+/// on Wayland (only on X11), so dropping files from the file manager showed a "no" cursor: use
+/// XWayland when it's there. Except on niri, whose XWayland (xwayland-satellite) breaks window
+/// management (maximize/restore), so it stays on native Wayland and gives up file drops.
+/// `SOLIDCRAFT_WAYLAND=1` keeps native Wayland, `SOLIDCRAFT_WAYLAND=0` forces XWayland.
+#[cfg(all(unix, not(target_os = "macos")))]
+fn prefer_x11(display: bool, wayland_display: bool, desktop: Option<&str>, wayland_override: Option<&str>) -> bool {
+    match wayland_override.map(str::trim) {
+        Some("0") => return display,
+        Some(_) => return false,
+        None => {}
+    }
+    let niri = desktop.is_some_and(|d| d.split(':').any(|name| name.trim().eq_ignore_ascii_case("niri")));
+    display && !(niri && wayland_display)
+}
+
+#[cfg(all(test, unix, not(target_os = "macos")))]
+mod backend_tests {
+    use super::prefer_x11;
+
+    #[test]
+    fn xwayland_by_default_native_wayland_on_niri_and_the_override_wins() {
+        // XWayland whenever there's an X display, for file drag-and-drop.
+        assert!(prefer_x11(true, true, Some("GNOME"), None));
+        assert!(prefer_x11(true, false, None, None));
+        assert!(!prefer_x11(false, true, Some("KDE"), None));
+        // niri (alone or in a desktop list) under Wayland stays native.
+        assert!(!prefer_x11(true, true, Some("niri"), None));
+        assert!(!prefer_x11(true, true, Some("niri:GNOME"), None));
+        // niri without a Wayland socket (nested X session) still uses X11.
+        assert!(prefer_x11(true, false, Some("niri"), None));
+        // SOLIDCRAFT_WAYLAND: anything but 0 keeps Wayland, 0 forces XWayland (when present).
+        assert!(!prefer_x11(true, true, Some("GNOME"), Some("1")));
+        assert!(!prefer_x11(true, true, Some("GNOME"), Some("")));
+        assert!(prefer_x11(true, true, Some("niri"), Some("0")));
+        assert!(!prefer_x11(false, true, Some("niri"), Some("0")));
+    }
+}
+
+#[cfg(test)]
+mod icon_tests {
+    #[cfg(target_os = "macos")]
+    #[test]
+    fn macos_preserves_the_bundle_icon_instead_of_setting_a_runtime_bitmap() {
+        let viewport = super::app_viewport().expect("viewport");
+        assert_eq!(viewport.icon.as_deref(), Some(&eframe::egui::IconData::default()));
+        assert_eq!(viewport.app_id.as_deref(), Some(super::APP_ID));
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    #[test]
+    fn desktop_viewport_supplies_the_original_mark_to_the_window() {
+        let viewport = super::app_viewport().expect("viewport");
+        let icon = viewport.icon.expect("running window must have an icon");
+        assert_eq!((icon.width, icon.height), (64, 64));
+        assert_eq!(icon.rgba, super::app_icon::rgba(64).expect("original mark"));
+        assert_eq!(viewport.app_id.as_deref(), Some(super::APP_ID));
+    }
+}
+
+#[cfg(test)]
+mod msaa_tests {
+    #[test]
+    fn first_launch_adopts_the_previous_release_settings() {
+        let d = std::env::temp_dir().join(format!("solidcraft-adopt-settings-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&d);
+        let (current, legacy, legacy_eframe) = (d.join("solidcraft"), d.join("solvecraft"), d.join("ai.storyteller.solvecraft"));
+        std::fs::create_dir_all(&legacy).unwrap();
+        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();
+        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();
+        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);
+    }
+
+    #[test]
+    fn saved_multisampling_uses_the_selected_backend_policy() {
+        use eframe::wgpu::Backend;
+        for requested in [1, 2, 4, 8] {
+            assert_eq!(eframe::egui_wgpu::effective_msaa_samples(Backend::Gl, requested), 1);
+            for backend in [Backend::Vulkan, Backend::Dx12, Backend::Metal] {
+                assert_eq!(eframe::egui_wgpu::effective_msaa_samples(backend, requested), requested);
+            }
+        }
+    }
+}

apps/solidcraft/src/space_mouse.rs

@@ -0,0 +1,604 @@
+//! 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.
+
+mod hid_descriptor;
+#[cfg(target_os = "linux")]
+mod hidraw;
+
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
+
+use egui::Context;
+use hid_descriptor::Layout;
+#[cfg(target_os = "windows")]
+use hidapi::{DeviceInfo, HidApi};
+use quick_xml::Reader;
+use quick_xml::events::Event;
+use solidcraft_engine::render::Camera;
+use solidcraft_ui_egui::SolveApp;
+
+const STALE_AFTER: Duration = Duration::from_millis(150);
+const RETRY_AFTER: Duration = Duration::from_secs(2);
+const MAX_PROFILE_BYTES: u64 = 1024 * 1024;
+
+#[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]] }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default)]
+struct ProfileAxis {
+    input: Option<usize>,
+    output: Option<usize>,
+    enabled: bool,
+    reversed: bool,
+    scale: f64,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum ProfilePart {
+    Input,
+    Output,
+}
+
+fn axis_index(name: &str) -> Option<usize> {
+    match name.trim() {
+        "HIDMultiAxis_X" => Some(0),
+        "HIDMultiAxis_Y" => Some(1),
+        "HIDMultiAxis_Z" => Some(2),
+        "HIDMultiAxis_Rx" => Some(3),
+        "HIDMultiAxis_Ry" => Some(4),
+        "HIDMultiAxis_Rz" => Some(5),
+        _ => None,
+    }
+}
+
+/// 3DxWare stores the active KMJ application's axis selection, swapping, inversion and speed in
+/// `%APPDATA%/3Dconnexion/3DxWare/Cfg/<app>-KMJ.xml`. Direct HID reads bypass the driver, so apply
+/// that profile explicitly when it exists. Unknown or incomplete fields retain the raw HID axis.
+fn parse_driver_mapping(xml: &[u8]) -> Option<DriverMapping> {
+    let mut reader = Reader::from_reader(xml);
+    reader.config_mut().trim_text(true);
+    let mut buf = Vec::new();
+    let mut mapping = DriverMapping::default();
+    let mut axis: Option<ProfileAxis> = None;
+    let mut part = None;
+    let mut field = Vec::new();
+    let mut found = false;
+    loop {
+        match reader.read_event_into(&mut buf).ok()? {
+            Event::Start(start) => match start.local_name().as_ref() {
+                b"Axis" => axis = Some(ProfileAxis { enabled: true, scale: 1.0, ..Default::default() }),
+                b"Input" => part = Some(ProfilePart::Input),
+                b"Output" => part = Some(ProfilePart::Output),
+                name @ (b"ActionID" | b"Enabled" | b"Reversed" | b"Scale" | b"OverallScale") => field = name.to_vec(),
+                _ => {}
+            },
+            Event::Text(text) => {
+                let value = String::from_utf8_lossy(text.as_ref());
+                match field.as_slice() {
+                    b"ActionID" => {
+                        if let Some(current) = axis.as_mut() {
+                            match part {
+                                Some(ProfilePart::Input) => current.input = axis_index(&value),
+                                Some(ProfilePart::Output) => current.output = axis_index(&value),
+                                None => {}
+                            }
+                        }
+                    }
+                    b"Enabled" => {
+                        if let Some(current) = axis.as_mut() {
+                            current.enabled = value.trim().eq_ignore_ascii_case("true");
+                        }
+                    }
+                    b"Reversed" => {
+                        if part == Some(ProfilePart::Output)
+                            && let Some(current) = axis.as_mut()
+                        {
+                            current.reversed = value.trim().eq_ignore_ascii_case("true");
+                        }
+                    }
+                    b"Scale" => {
+                        if part == Some(ProfilePart::Output)
+                            && let Some(scale) = value.trim().parse::<f64>().ok().filter(|scale| scale.is_finite())
+                            && let Some(current) = axis.as_mut()
+                        {
+                            current.scale = scale.clamp(0.0, 10.0);
+                        }
+                    }
+                    b"OverallScale" => {
+                        if let Some(scale) = value.trim().parse::<f64>().ok().filter(|scale| scale.is_finite()) {
+                            mapping.overall_scale = scale.clamp(0.0, 10.0);
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Event::End(end) => match end.local_name().as_ref() {
+                b"Axis" => {
+                    if let Some(current) = axis.take()
+                        && let (Some(input), Some(output)) = (current.input, current.output)
+                    {
+                        mapping.axes[input] = AxisRule { output, enabled: current.enabled, reversed: current.reversed, scale: current.scale };
+                        found = true;
+                    }
+                }
+                b"Input" | b"Output" => part = None,
+                b"ActionID" | b"Enabled" | b"Reversed" | b"Scale" | b"OverallScale" => field.clear(),
+                _ => {}
+            },
+            Event::Eof => break,
+            _ => {}
+        }
+        buf.clear();
+    }
+    found.then_some(mapping)
+}
+
+fn load_driver_mapping() -> Option<DriverMapping> {
+    let cfg = std::path::PathBuf::from(std::env::var_os("APPDATA")?).join("3Dconnexion").join("3DxWare").join("Cfg");
+    // The driver names the profile after the executable; one made for the pre-rename executable
+    // still applies until the driver writes a new one (compatibility shim).
+    let profile = ["solidcraft-KMJ.xml", "solvecraft-KMJ.xml"].into_iter().map(|n| cfg.join(n)).find(|p| p.is_file())?;
+    if std::fs::metadata(&profile).ok()?.len() > MAX_PROFILE_BYTES {
+        log::warn!("3D mouse: ignoring oversized 3DxWare profile {}", profile.display());
+        return None;
+    }
+    let xml = std::fs::read(&profile).ok()?;
+    parse_driver_mapping(&xml)
+}
+
+#[derive(Clone, Copy)]
+struct Reading {
+    axes: Axes,
+    translation_at: Instant,
+    rotation_at: Instant,
+}
+
+impl Reading {
+    fn new(now: Instant) -> Self {
+        Self { axes: Axes::default(), translation_at: now, rotation_at: now }
+    }
+
+    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 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 HID usage excludes ordinary Logitech mice and the keyboard interfaces of SpaceMice.
+#[cfg(target_os = "windows")]
+fn is_3d_mouse(info: &DeviceInfo) -> bool {
+    is_3d_mouse_vendor(info.vendor_id()) && 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.
+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
+        }
+        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,
+    }
+}
+
+/// Publishes one input report from the device to the egui thread.
+fn publish(ctx: &Context, shared: &Mutex<Reading>, layout: Layout, report: &[u8]) {
+    if let Ok(mut reading) = shared.lock()
+        && decode_report(report, layout, &mut reading, Instant::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() {
+        *reading = Reading::new(Instant::now());
+    }
+    ctx.request_repaint();
+}
+
+#[cfg(target_os = "windows")]
+fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
+    let Ok(mut api) = HidApi::new() else {
+        log::warn!("3D mouse: HID initialization failed");
+        return;
+    };
+    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];
+            loop {
+                match device.read_timeout(&mut report, 100) {
+                    Ok(0) => {}
+                    Ok(size) => publish(&ctx, &shared, layout, report.get(..size).unwrap_or_default()),
+                    Err(error) => {
+                        log::info!("3D mouse disconnected: {error}");
+                        break;
+                    }
+                }
+            }
+            reset(&ctx, &shared);
+        }
+        std::thread::sleep(RETRY_AFTER);
+    }
+}
+
+/// 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 {
+    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
+        }
+    }
+}
+
+/// 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() {
+            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];
+                    loop {
+                        match file.read(&mut report) {
+                            Ok(0) => break,
+                            Ok(size) => publish(&ctx, &shared, device.layout, report.get(..size).unwrap_or_default()),
+                            Err(error) if error.kind() == std::io::ErrorKind::Interrupted => {}
+                            Err(error) => {
+                                log::info!("3D mouse disconnected: {error}");
+                                break;
+                            }
+                        }
+                    }
+                    reset(&ctx, &shared);
+                }
+                // Say so once per device node, not every retry.
+                Err(error) if denied.as_ref() != Some(&device.path) => {
+                    log::warn!("3D mouse: cannot open {}: {error}. A udev rule granting the logged-in user access is needed.", device.path.display());
+                    denied = Some(device.path);
+                }
+                Err(_) => {}
+            }
+        }
+        std::thread::sleep(RETRY_AFTER);
+    }
+}
+
+pub struct SpaceMouse {
+    shared: Arc<Mutex<Reading>>,
+    last_frame: Instant,
+    driver_mapping: DriverMapping,
+    mapping_checked_at: Instant,
+}
+
+impl SpaceMouse {
+    pub fn start(ctx: &Context) -> Self {
+        let now = Instant::now();
+        let shared = Arc::new(Mutex::new(Reading::new(now)));
+        let worker_state = Arc::clone(&shared);
+        let worker_ctx = ctx.clone();
+        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 }
+    }
+
+    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.last_frame = now;
+        if now.duration_since(self.mapping_checked_at) >= RETRY_AFTER {
+            let updated = load_driver_mapping().unwrap_or_default();
+            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);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn raw(axes: Axes) -> Motion {
+        DriverMapping::default().apply(axes)
+    }
+
+    #[test]
+    fn decodes_separate_reports_without_stale_motion_or_padding_interference() {
+        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 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] });
+    }
+
+    #[test]
+    fn combined_report_one_carries_translation_and_rotation_together() {
+        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] });
+    }
+
+    #[test]
+    fn combined_layout_ignores_short_and_other_reports() {
+        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] });
+    }
+
+    #[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);
+    }
+
+    #[test]
+    fn applies_3dxware_axis_swaps_and_reversals() {
+        let profile = 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_Z</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Z</ActionID></Input><Output><ActionID>HIDMultiAxis_Y</ActionID><Reversed>true</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>false</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 mapping = parse_driver_mapping(profile).expect("valid 3DxWare profile");
+        let motion = mapping.apply(Axes { translation: [350, 0, 350], rotation: [350, 0, 350] });
+        assert_eq!(motion.translation, [1.0, -1.0, 0.0]);
+        assert_eq!(motion.rotation, [1.0, -1.0, 0.0]);
+    }
+
+    #[test]
+    fn mapped_roll_and_spin_reach_distinct_camera_rotations() {
+        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>
+              <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 mapping = parse_driver_mapping(profile).expect("valid 3DxWare profile");
+        let before = Camera::default();
+
+        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);
+
+        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));
+    }
+}

apps/solidcraft/src/space_mouse/hid_descriptor.rs

@@ -0,0 +1,253 @@
+//! 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

@@ -0,0 +1,57 @@
+//! 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.
+
+use std::path::{Path, PathBuf};
+
+use super::hid_descriptor::{Descriptor, Layout};
+
+const SYSFS: &str = "/sys/class/hidraw";
+const DEV: &str = "/dev";
+
+pub struct Device {
+    pub path: PathBuf,
+    pub layout: Layout,
+}
+
+/// 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.
+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();
+    names.into_iter().find_map(|name| probe(&Path::new(SYSFS).join(&name), Path::new(DEV).join(&name)))
+}
+
+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() })
+}
+
+#[cfg(test)]
+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:?}");
+        }
+    }
+}

assets/README.md

@@ -0,0 +1,41 @@
+# SolidCraft macOS icon
+
+`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.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
+```
+
+`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.
+
+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.
+
+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.

assets/SolidCraft.icon/Assets/02-grid-dark.svg

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <defs>
+    <radialGradient id="radial-gradient-1" cx="0" cy="0" r="699.707" gradientTransform="matrix(1 0 0 0.5 512 740.159)" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#81ace1"/>
+      <stop offset="0.3" stop-color="#81ace1" stop-opacity="0.9"/>
+      <stop offset="0.65" stop-color="#81ace1" stop-opacity="0.35"/>
+      <stop offset="1" stop-color="#81ace1" stop-opacity="0"/>
+    </radialGradient>
+  </defs>
+  <title>SolidCraft macOS application icon</title>
+  <g id="Experiment___faint_origin_grid" data-name="Experiment • faint origin grid">
+    <path id="Grid___elliptical_radial_alpha_beneath_solid" data-name="Grid • elliptical radial alpha beneath solid" d="M-19.692 -364.359 L1043.692 248.564 M-19.692 248.564 L1043.692 -364.359 M-19.692 -250.351 L1043.692 362.572 M-19.692 362.572 L1043.692 -250.351 M-19.692 -136.343 L1043.692 476.58 M-19.692 476.58 L1043.692 -136.343 M-19.692 -22.335 L1043.692 590.588 M-19.692 590.588 L1043.692 -22.335 M-19.692 91.673 L1043.692 704.596 M-19.692 704.596 L1043.692 91.673 M-19.692 205.681 L1043.692 818.604 M-19.692 818.604 L1043.692 205.681 M-19.692 319.689 L1043.692 932.612 M-19.692 932.612 L1043.692 319.689 M-19.692 547.705 L1043.692 1160.628 M-19.692 1160.628 L1043.692 547.705 M-19.692 661.713 L1043.692 1274.636 M-19.692 1274.636 L1043.692 661.713 M-19.692 775.721 L1043.692 1388.644 M-19.692 1388.644 L1043.692 775.721 M-19.692 889.729 L1043.692 1502.652 M-19.692 1502.652 L1043.692 889.729 M-19.692 1003.737 L1043.692 1616.66 M-19.692 1616.66 L1043.692 1003.737 M-19.692 1117.745 L1043.692 1730.668 M-19.692 1730.668 L1043.692 1117.745" fill="none" stroke="url(#radial-gradient-1)" stroke-width="3.2" stroke-miterlimit="10" opacity="0.28"/>
+    <path id="Origin_axes___shared_elliptical_radial_alpha" data-name="Origin axes • shared elliptical radial alpha" d="M-19.692 433.697 L1043.692 1046.62 M-19.692 1046.62 L1043.692 433.697" fill="none" stroke="url(#radial-gradient-1)" stroke-width="3.6" stroke-miterlimit="10" opacity="0.28"/>
+  </g>
+</svg>

assets/SolidCraft.icon/Assets/02-grid.svg

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <defs>
+    <radialGradient id="radial-gradient-1" cx="0" cy="0" r="699.707" gradientTransform="matrix(1 0 0 0.5 512 740.159)" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#507eaa"/>
+      <stop offset="0.3" stop-color="#507eaa" stop-opacity="0.9"/>
+      <stop offset="0.65" stop-color="#507eaa" stop-opacity="0.35"/>
+      <stop offset="1" stop-color="#507eaa" stop-opacity="0"/>
+    </radialGradient>
+  </defs>
+  <title>Untitled-2</title>
+  <g id="_02_Grid" data-name="02 Grid">
+    <path id="Grid___elliptical_radial_alpha_beneath_solid" data-name="Grid • elliptical radial alpha beneath solid" d="M-19.692 -364.359 L1043.692 248.564 M-19.692 248.564 L1043.692 -364.359 M-19.692 -250.351 L1043.692 362.572 M-19.692 362.572 L1043.692 -250.351 M-19.692 -136.343 L1043.692 476.58 M-19.692 476.58 L1043.692 -136.343 M-19.692 -22.335 L1043.692 590.588 M-19.692 590.588 L1043.692 -22.335 M-19.692 91.673 L1043.692 704.596 M-19.692 704.596 L1043.692 91.673 M-19.692 205.681 L1043.692 818.604 M-19.692 818.604 L1043.692 205.681 M-19.692 319.689 L1043.692 932.612 M-19.692 932.612 L1043.692 319.689 M-19.692 547.705 L1043.692 1160.628 M-19.692 1160.628 L1043.692 547.705 M-19.692 661.713 L1043.692 1274.636 M-19.692 1274.636 L1043.692 661.713 M-19.692 775.721 L1043.692 1388.644 M-19.692 1388.644 L1043.692 775.721 M-19.692 889.729 L1043.692 1502.652 M-19.692 1502.652 L1043.692 889.729 M-19.692 1003.737 L1043.692 1616.66 M-19.692 1616.66 L1043.692 1003.737 M-19.692 1117.745 L1043.692 1730.668 M-19.692 1730.668 L1043.692 1117.745" fill="none" stroke="url(#radial-gradient-1)" stroke-width="3.938" stroke-miterlimit="10" opacity="0.28"/>
+    <path id="Origin_axes___shared_elliptical_radial_alpha" data-name="Origin axes • shared elliptical radial alpha" d="M-19.692 433.697 L1043.692 1046.62 M-19.692 1046.62 L1043.692 433.697" fill="none" stroke="url(#radial-gradient-1)" stroke-width="4.431" stroke-miterlimit="10" opacity="0.28"/>
+  </g>
+</svg>

assets/SolidCraft.icon/Assets/03-solid-blue-cutout.svg

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <defs>
+    <linearGradient id="linear-gradient-1" x1="619.14" y1="179.734" x2="694.687" y2="396.761" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#1d63c6"/>
+      <stop offset="1" stop-color="#15499e"/>
+    </linearGradient>
+    <linearGradient id="linear-gradient-2" x1="619.14" y1="413.244" x2="790.839" y2="605.547" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#459fff"/>
+      <stop offset="1" stop-color="#2379e7"/>
+    </linearGradient>
+    <linearGradient id="linear-gradient-3" x1="632.876" y1="399.508" x2="783.971" y2="968.175" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#1b66cf"/>
+      <stop offset="1" stop-color="#124596"/>
+    </linearGradient>
+    <linearGradient id="linear-gradient-4" x1="207.063" y1="303.357" x2="426.837" y2="968.175" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#258df5"/>
+      <stop offset="1" stop-color="#1461da"/>
+    </linearGradient>
+    <linearGradient id="linear-gradient-5" x1="385.63" y1="53.364" x2="522.989" y2="510.769" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#51adff"/>
+      <stop offset="1" stop-color="#2b83f1"/>
+    </linearGradient>
+  </defs>
+  <title>SolidCraft • blue cutout 36 pt</title>
+  <g id="Layer_1" data-name="Layer 1">
+    <path id="Inner___upper_step___36_pt_cutout" data-name="Inner • upper step • 36 pt cutout" d="M547.883 282.66 L709.797 188.211 L709.797 375.985 Z" fill="url(#linear-gradient-1)"/>
+    <path id="Top___lower_step___36_pt_cutout" data-name="Top • lower step • 36 pt cutout" d="M727.797 593.626 L727.797 407.136 L889.571 500.381 Z" fill="url(#linear-gradient-2)"/>
+    <path id="Right___milled_recess___36_pt_cutout" data-name="Right • milled recess • 36 pt cutout" d="M530 521.17 L691.797 427.912 L691.797 655.928 L907.594 531.545 L907.594 740.159 L530 957.8 Z" fill="url(#linear-gradient-3)"/>
+    <path id="Left___stepped_face___36_pt_cutout" data-name="Left • stepped face • 36 pt cutout" d="M116.406 510.769 L116.406 303.529 L494 521.17 L494 957.8 L314.203 854.167 L314.203 624.777 Z" fill="url(#linear-gradient-4)"/>
+    <path id="Top___extruded_profile___36_pt_cutout" data-name="Top • extruded profile • 36 pt cutout" d="M134.374 272.334 L512 53.364 L691.828 157.015 L476.117 282.846 L673.752 396.761 L512 489.993 Z" fill="url(#linear-gradient-5)"/>
+  </g>
+</svg>

assets/SolidCraft.icon/icon.json

@@ -0,0 +1,109 @@
+{
+  "fill" : "system-light",
+  "groups" : [
+    {
+      "layers" : [
+        {
+          "glass-specializations" : [
+            {
+              "appearance" : "tinted",
+              "value" : true
+            }
+          ],
+          "image-name" : "03-solid-blue-cutout.svg",
+          "name" : "03-solid-blue-cutout",
+          "position" : {
+            "scale" : 0.9,
+            "translation-in-points" : [
+              0,
+              0
+            ]
+          }
+        }
+      ],
+      "name" : "03 Solid",
+      "shadow" : {
+        "kind" : "none",
+        "opacity" : 0
+      },
+      "specular" : true,
+      "translucency" : {
+        "enabled" : false,
+        "value" : 0.3
+      }
+    },
+    {
+      "layers" : [
+        {
+          "blend-mode-specializations" : [
+            {
+              "appearance" : "dark",
+              "value" : "normal"
+            }
+          ],
+          "fill" : "none",
+          "glass-specializations" : [
+            {
+              "value" : false
+            },
+            {
+              "appearance" : "dark",
+              "value" : false
+            },
+            {
+              "appearance" : "tinted",
+              "value" : true
+            }
+          ],
+          "hidden" : false,
+          "image-name-specializations" : [
+            {
+              "value" : "02-grid.svg"
+            },
+            {
+              "appearance" : "dark",
+              "value" : "02-grid-dark.svg"
+            }
+          ],
+          "name" : "02-grid",
+          "opacity-specializations" : [
+            {
+              "value" : 1
+            },
+            {
+              "appearance" : "dark",
+              "value" : 1
+            },
+            {
+              "appearance" : "tinted",
+              "value" : 1
+            }
+          ],
+          "position" : {
+            "scale" : 0.9,
+            "translation-in-points" : [
+              0,
+              0
+            ]
+          }
+        }
+      ],
+      "name" : "02 Grid",
+      "shadow" : {
+        "kind" : "none",
+        "opacity" : 0
+      },
+      "specular" : false,
+      "translucency" : {
+        "enabled" : false,
+        "value" : 0.3
+      }
+    }
+  ],
+  "supported-platforms" : {
+    "circles" : [
+      "watchOS"
+    ],
+    "squares" : "shared"
+  }
+}