Fix docs SEO metadata and crawlability

[blove]

Summary

• add shared site metadata, canonical URLs, Open Graph/Twitter metadata, robots.txt, and sitemap.xml
• derive docs page descriptions from MDX content and add tests for sitemap coverage, duplicate descriptions, and broken internal docs links
• fix stale Agent docs links, docs table accessibility/scrolling, and production llms-full API reference output

Verification

• PATH=/tmp/codex-node-bin:node_modules/.bin:/Users/blove/.cargo/bin:/Users/blove/.codex/tmp/arg0/codex-arg03ZsBnM:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Codex.app/Contents/Resources /tmp/codex-node-unsigned node_modules/vitest/vitest.mjs run apps/website/src/lib/docs.spec.ts
• PATH=/tmp/codex-node-bin:node_modules/.bin:/Users/blove/.cargo/bin:/Users/blove/.codex/tmp/arg0/codex-arg03ZsBnM:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Codex.app/Contents/Resources nx lint website
• PATH=/tmp/codex-node-bin:node_modules/.bin:/Users/blove/.cargo/bin:/Users/blove/.codex/tmp/arg0/codex-arg03ZsBnM:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Codex.app/Contents/Resources nx build website
• PATH=/tmp/codex-node-bin:node_modules/.bin:/Users/blove/.cargo/bin:/Users/blove/.codex/tmp/arg0/codex-arg03ZsBnM:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Codex.app/Contents/Resources BASE_URL=http://127.0.0.1:4308 nx e2e website --skipInstall
• production smoke: /llms-full.txt, /robots.txt, /sitemap.xml on nx serve website --configuration=production --port=4310

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 16, 2026 6:50pm