navigation
Make a page reachable and keep its links valid — the preview sidebar/navbar menu in `shared/data/menu.json`, the docs menu in `shared/data/docs.json`, and the redirects in `docs/lib/redirects.ts`. Use whenever a page is added, renamed, moved or removed in `preview/pages/` or `docs/content/`, whenever a `pageMenu` key does not highlight the right entry, and whenever a docs URL changes. Covers both menu formats, the `pageMenu` key rules and the link gate.
SKILL.md
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