reinstate-seo-cilisted

# Reinstate SEO CI ## Required checks ### Build - production build succeeds - generated routes match expectations ### Metadata For every indexable HTML page: - exactly one title - exactly one description - exactly one canonical - exactly one H1 - valid robots directive - Open Graph image and alt - Twitter image and alt ### Canonicals - absolute HTTPS - correct host - status 200 - no redirect - no fragment - unique ### Sitemap - valid XML - canonical URLs only - no draft, preview, API, redirect, 404, or `noindex` URL ### Structured data - parseable JSON - safe serialization - valid absolute URLs - valid dates - no prohibited fabricated fields - visible-content match ### Content - required frontmatter - unique slug - updated date - no future publication unless scheduled - related links resolve - no placeholder copy - current product claims ### Links - internal links - anchors - assets - canonical destinations ### Performance - Lighthouse SEO score 1.0 as a smoke test - accessibility regression warning - LCP lab warning above 2500 ms - CLS warning above 0.1 - field INP tracked separately ## Workflow 1. Inspect existing CI. 2. choose minimal maintained tools. 3. add scripts. 4. add a representative route list. 5. create actionable failure messages. 6. avoid flaky network dependence where possible. 7. run locally. 8. run in CI. 9. document how to update baselines.