Add unlisted CWCW insight review pages

[ajlennon]

Summary

• add a public-but-unlisted review lane for CWCW insight drafts
• copy only the article and publication metadata from private draft packages
• render the event-driven harness article as the first review page
• keep review drafts out of Insights, RSS, sitemap, llms.txt, social metadata and social-card generation
• add visible draft labelling, restrictive robots metadata, safe Markdown rendering and stale-page cleanup

Testing

• npm test
  • privacy gate passed
  • 6 insight tool tests passed
  • 70 Playwright tests passed across desktop and mobile

Disclosure

AI-assisted by Codex. Alex supplied the editorial direction and source material; Codex implemented the review lane and its tests.