Apply CorvidLabs design system to the docs

[0xLeif]

Summary

Themes the spec-sync docs site to the CorvidLabs design-system standard. The site was off-brand (no design tokens, no light/dark, sky-blue accent). This vendors the brand standard and rebuilds the docs (11 pages) + examples (3) + shared chrome on it. The marketing landing and language gallery are being moved to the corvidlabs-site hub, so they were left untouched beyond the shared header/footer.

• Vendored the standard into site/public/brand/ via sync-to.sh (design-system v1.1.0): tokens.css, theme.js, theme-toggle.html, crow marks, favicon.svg.
• Tokens: tokens.css loaded globally; the site's legacy variable layer (--bg, --text, --accent, --drift…) is aliased onto brand tokens, so every existing component themes for free in light + dark. Square corners, no purple.
• Fonts: Schibsted Grotesk (display/body) + Spline Sans Mono (code) via Google Fonts.
• Light + dark: prefers-color-scheme with the standard sun/moon toggle in the header, pre-paint snippet for no-flash, ?theme= override for QA. Never a "THEME" text button.
• Logo: crow head mark inlined with currentColor in the header; favicon → /brand/favicon.svg.
• Syntax: switched Shiki to the css-variables theme and mapped --astro-code-token-* onto the brand --code-* palette, so all .spec.md/YAML/CLI code blocks follow light/dark and stay on-brand (teal keywords, green strings, amber numbers, muted comments — no blue/purple defaults).
• A11y/polish: prefers-reduced-motion guards on all transitions/animations, focus-visible rings on the sheen accent, WCAG AA in both modes, responsive (mobile keeps the toggle, hides GitHub/Install).

Test Plan

• bun run build passes (34 pages)
• bun run lint (astro check): 0 errors / 0 warnings / 0 hints
• Screenshotted docs home, CLI reference, spec-format, and an examples page in both light and dark at 1440 and 500 — verified by reading each:
  • Docs home (light/dark, 1440 + mobile): warm paper / dark surfaces, crow mark, sun/moon toggle, on-brand Quick Start code block. ✓
  • CLI reference (light/dark, 1440 + mobile): command badges + provider table + code all on-brand, no purple. ✓
  • Spec format (dark): YAML/spec syntax on the brand palette. ✓
  • Examples / CI gate (light, 1440 + mobile): article layout, teal eyebrow, diff-style code blocks. ✓
  • Mobile: hamburger + theme toggle both present, Contents toggle, horizontal code scroll. ✓

Needs review

• Marketing landing (index.astro) + language gallery (LanguageCard, languages/[slug]) still carry the old amber #fbbf24 accent on SpecCodeDiff/language tags. Intentionally left for the hub migration — flagging so it isn't mistaken for a miss.

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[github-actions]

✅ Corvin says...

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    <(^\  .oO(Caw! ^v^)
     |/(\
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"Caw! Found a shiny new spec!"

CI Summary

Check	Status
Validate action.yml	✅ Passed
Dependency Audit	✅ Passed
Code Coverage	✅ Passed
Format Check	✅ Passed
Docs Site	✅ Passed
Spec Validation	✅ Passed
Tests (build, test, clippy)	✅ Passed
VS Code Extension	✅ Passed

📋 Spec Validation Details

✅ SpecSync: Passed

Metric	Value
Specs checked	58
Passed	58
Errors	0
Warnings	0
File coverage	100% (74/74)
LOC coverage	100% (33727/33727)

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Generated by specsync · Run specsync check --format github to reproduce

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[0xLeif]

Superseded by the single-site consolidation: docs are migrating into corvidlabs-site (the only site updated going forward); this site will be redirected/retired. Closing per the new strategy.