SEO: rebalance publishing cadence and crawl paths

[TeoSlayer]

Summary

• redistribute the publication archive from February through August on an approximately every-other-day cadence while preserving dated announcements
• sort blog and feed surfaces by machine-readable publication date
• strengthen crawl paths among setup pages and learning guides
• emit accurate article and sitemap dates for learning content
• add a reusable live indexability audit across every sitemap URL
• replace weak or broken external citations and remove unrelated promotional backlinks
• improve bottom-directory contrast and mobile tap targets

Verification

• npm run check:plain
• npm run build
• npm run check:site
• live audit: 274 URLs, 0 indexability blockers, 0 near-duplicate pairs
• production-preview Lighthouse: 100 performance / 100 accessibility / 100 best practices / 100 SEO on setup and learning templates
• 0 blog metadata/page-date mismatches
• RSS strictly descending from 2026-09-02 to 2026-02-02

[github-actions]

🚀 Preview deployed to Cloudflare Pages

• Commit deploy URL: https://187f5a5c.pilotprotocol.pages.dev
• Branch alias: https://codex/backdate-blog-content.pilotprotocol.pages.dev (may take ~30s to propagate)
• Commit: 587afabdf7c14f13bd860beb487eea8723c0d626