refactor: retire the hand-written site

Deletes the pre-Astro pages, scripts, and stylesheets that the migration
replaced, and moves the ones it did not replace out of the way.

Deleted (32 files): app.js, responsive.css, landing.css, rules/app.js,
rules/styles.css, skills/app.js, the ten route index.html files, and the
root hands-on/ copy, which is byte-identical to public/hands-on/ -- the
one the build actually ships.

Moved to legacy/ (12 files): styles.css, full-guide/audit.css,
chapters.css, skills/styles.css, skills-review/styles.css,
skills-review/change-lens.css, and the skills-review/app.js module graph.
These are not dead. The Astro pages import them and the build fails
without them, which the plan had not accounted for. They go to legacy/
rather than src/ because check-tokens.mjs sweeps src, and these files are
full of raw hex and unnamed breakpoints: moving one into src/ should mean
migrating it to tokens in the same change, not adding a scan exclusion.
The prettier, stylelint, and eslint ignore lists that already named these
files at their old paths now name legacy/ instead.

verify.mjs no longer reads app.js. The 102 Portuguese strings were
extracted from its translations.pt object before deletion into
.agents/snapshots/full-guide-pt.json -- a legacy capture, not a snapshot
of the Astro build, so the assertion still compares against an
independent source. The brace-matching helper's assertion is replaced by
one that rejects an empty snapshot entry, without which trimming the
snapshot would make the presence check pass vacuously. Count stays at 84.

audit-ui.mjs reads the ten pages from dist/ and resolves Astro's
base-absolute hrefs against it.

Before deleting anything, rendered-text-diff was run across all ten
routes plus both Portuguese pages: every one at parity, 0 missing and 0
extra. That comparison is not repeatable once the legacy files are gone.
computed-style-diff on /full-guide/ stays at 32 differences, so the moves
are style-neutral.

Docs updated to match: README, AGENTS.md, GATES.md, the architecture
context, the operations guide's lab instructions, and the three skills
that told you to serve the vanilla site.

Publishing is not part of this commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -15,39 +15,50 @@ skill links to a pinned source with an approval-first installation prompt.
 
 ## Run locally
 
-This is a dependency-free static site:
+This is an Astro static site. It builds to `dist/` and ships no runtime
+dependencies.
 
 ```bash
-python3 -m http.server 4173
+pnpm install
+pnpm run dev        # http://localhost:4321/ai-for-dummies/
+pnpm run build      # writes dist/
+pnpm run preview    # serves the built output
 ```
 
-Then open <http://localhost:4173>.
-
 Verify the content and interaction contracts with:
 
 ```bash
-pnpm run verify
+pnpm run verify     # reads dist/, so build first
+```
+
+The full gate — `astro check`, `astro build`, `verify.mjs`, `audit-ui.mjs`,
+`check-tokens.mjs`, and the assertion-count floor — runs as:
+
+```bash
+bash .agents/scripts/gate.sh
 ```
 
 ## Project structure
 
-- `index.html` — default route map and focused chapter navigation
-- `full-guide/` — the complete bilingual presentation, with responsive audit
-  overrides
-- `styles.css` / `app.js` — editorial visual system and bilingual field-guide
-  interactions
-- `responsive.css` — interactive diagrams and Full HD-to-4K adaptations
+- `src/pages/` — one file per route: the landing route map, the complete
+  bilingual `full-guide`, the chapter pages, `rules`, `skills`, and
+  `skills-review`
+- `src/components/` — blocks and islands; the interactive diagrams, selectors,
+  and the language toggle
+- `src/content/` — the content collections every page renders from
+- `src/styles/tokens.css` — the design tokens
+- `legacy/` — the editorial visual system and the review-desk modules, not yet
+  migrated into components. Still imported by the pages that need them; see
+  `.agents/context/architecture.md`
+- `public/` — assets copied to the site root verbatim: fonts, the hands-on labs,
+  and `submitted-skills/`
 - `docs/references/` — bundled research sources and notes
 - `docs/operations-guide.md` — canonical SilverBullet operations and skills
   guide
-- `hands-on/starter/` — dependency-free Tiny Tasks exercise
-- `hands-on/rules/` — dependency-free Guardrails lab; toggles rule sources into
-  the prompt
-- `rules/` — bilingual case study of skills, CLI ratchets, Husky, and PR review
-- `skills/` — reusable design and rules-case-study skills, plus an interactive
-  package anatomy explorer
-- `skills-review/` — static review desk for submitted skills; its reader vote
-  widget calls the separate `vote-service`
+- `public/hands-on/starter/` — dependency-free Tiny Tasks exercise
+- `public/hands-on/rules/` — dependency-free Guardrails lab; toggles rule
+  sources into the prompt
+- `skills/` — reusable design and rules-case-study skills
 - `vote-service/` — small Go API + Kubernetes manifests backing the
   skills-review vote widget (see `vote-service/README.md`)
 - `GATES.md` — acceptance ledger for the project
@@ -55,7 +66,9 @@ pnpm run verify
 ## Publishing
 
 The Gitea instance has a Pages Server configured to publish a repository’s
-`pages` branch under `pages.marcospaulo.dev.br`. The intended site address is:
+`pages` branch under `pages.marcospaulo.dev.br`. `pages` now carries the
+**built** site — the contents of `dist/` — not a copy of `main`. The intended
+site address is:
 
 <https://netcracker.pages.marcospaulo.dev.br/ai-for-dummies/>
 
@@ -74,7 +87,7 @@ calls a separate stateful service — `vote-service/`, a small Go API on its own
 pod, one vote per visitor enforced server-side by IP (a MAC address is never
 visible to a server across the internet, so it cannot be used). See
 [vote-service/README.md](vote-service/README.md) for the API, the anti-abuse
-design, and the build/push/deploy steps; `skills-review/index.html` sets
+design, and the build/push/deploy steps; `src/pages/skills-review.astro` sets
 `window.SKILLS_REVIEW_VOTE_API` to point at it once deployed.
 
 ## Research