SEO: centralize canonical URLs

[MaggieAppleton]

Summary

• centralize canonical URL construction at the fixed public origin and emit exactly one canonical tag through the shared Layout
• preserve ordinary version-like filenames while canonicalizing only true folder-version archives
• remove the accidental Colophon fragment route and explicitly noindex the Diagram Preview utility
• extend the fast HTML verifier to 18 real routes with exact canonical, Open Graph, noindex, and absent-route contracts

Stack

• Depends on SEO: enforce one publication boundary #246
• Base branch: codex/seo-aeo-publication-boundary
• Exact base SHA: 9c528c0
• Eventual target: main, reviewed and merged oldest-first

Verification

• node --test tests/*.test.mjs: 88/88 passing
• npm run generate-links: clean generated output
• npx tsx src/scripts/generate-topics.ts: clean generated output
• npm run verify:html: 18/18 routes verified without requesting images
• npx astro check: 0 errors, 0 warnings, 28 pre-existing hints
• git diff --check 9c528c0..HEAD: clean
• two independent final reviews: clean

The full production image build was not repeated for this metadata-only slice. PR #246 records the successful exact-base build at 195 pages and 7,647 optimized images. A disposable copy-on-write dependency directory was used here to avoid the Astro cache-path issue caused by an absolute node_modules worktree symlink; no dependency download or image generation was required.

No merge or deploy is authorized by this PR.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
maggieappleton-com-v3	Ignored		Sep 7, 2026 10:55am UTC