Fix residual blog metadata from Ahrefs audit

[lawrencecchen]

Stacked on #7888.

Selects complete, route-specific metadata for 11 blog families, /nightly, and /guides across published locales. HTML, Open Graph, Twitter, and article schema use the same selected copy. English-only cmux-omo and gpl URLs now canonicalize instead of publishing fallback duplicates.

Tests: bun test (591 passed, 91 skipped), bun run typecheck, changed-file ESLint.

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Note

Low Risk
Marketing-site SEO, i18n routing, and sitemap/middleware only; no auth or data paths, with broad test coverage for alternates and canonicalization.

Overview
Addresses Ahrefs-style metadata gaps by routing 11 audited blog posts plus /nightly and /guides through shared blogPostSeoCopy / landingPageSeoCopy helpers so titles and descriptions are built from plain post copy (not raw metaDescription + seoDescription alone). Blog pages use title: { absolute: ... }, and BlogSchema accepts seoKey so article JSON-LD matches HTML, Open Graph, and Twitter.

/blog/cmux-omo and /blog/gpl are treated as English-only: englishFallbackContentLocales, per-route fallbackContentRoutes, blogPostsForLocale (index + pager), sitemap/agent-page lists, buildAlternates, and middleware now 301 localized URLs to canonical English paths and emit hreflang only for en.

Tests expand audited SEO coverage (including plainSeoMessageLookup guards) and assert blog discovery and canonical behavior for those posts.

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Summary by cubic

Fixes residual blog metadata from the SEO audit. Switches 11 audited posts and /nightly + /guides to plain‑text, canonical SEO, and hides English‑only posts from localized blog lists.

• Bug Fixes
  • Route audited blog pages through blogPostSeoCopy; set title: { absolute: ... } and pass seoKey to BlogSchema so JSON‑LD uses the same copy.
  • Use landingPageSeoCopy for /nightly and /guides with complete prose and site context.
  • Treat /blog/cmux-omo and /blog/gpl as English‑only: buildAlternates, Link headers, and sitemap emit only en; middleware respects route‑specific locales, chooses the preferred available locale, and 301s non‑canonical locale paths.
  • Hide English‑only posts from non‑English pages: blog index and pager use blogPostsForLocale; agent‑page lists and sitemap align.
  • Enforce plain‑text metadata (reject rich messages and list lead‑ins); small i18n copy tweaks; expanded tests for audited routes, alternates, and canonicalization; stabilized navigation mocks.

^{Written for commit 0fa332e. Summary will update on new commits.}

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[greptile-apps]

Greptile Summary

This PR aligns metadata and locale handling for audited marketing pages. The main changes are:

• Selects route-specific SEO copy for 11 blog posts, /nightly, and /guides.
• Reuses the selected copy across HTML, Open Graph, Twitter, and article schema metadata.
• Canonicalizes two English-only blog posts and removes their unsupported localized variants.
• Filters blog navigation, agent-readable pages, and sitemap entries by available locale.
• Expands tests for metadata selection, alternate links, and locale routing.

Confidence Score: 5/5

This looks safe to merge.

• The latest changes apply locale availability consistently across routing, navigation, sitemap, and agent-readable pages.
• Metadata and article schema now use the same route-specific copy.
• No blocking issue was found in the changed code.

Important Files Changed

Filename	Overview
web/i18n/audited-seo.ts	Adds shared selectors for audited blog and landing-page metadata.
web/i18n/locale-availability.ts	Introduces per-route locale availability, including English-only blog routes.
web/proxy.ts	Uses route-specific locales for negotiation, redirects, rewrites, and alternate Link headers.
web/app/[locale]/(landing)/blog/blog-schema.tsx	Uses the selected audited copy in article JSON-LD.
web/app/[locale]/components/blog-posts.ts	Filters blog entries by the locales in which each post is published.
web/app/sitemap.ts	Limits sitemap entries and alternates for English-only posts.
web/app/lib/agent-page-paths.ts	Limits agent-readable variants for English-only posts.

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