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CHANGELOG: stop presenting the service-worker API cache as an active offline store (/api is NetworkOnly) — describe it as a defensive purge of the legacy api-get-cache from older clients; add an explicit upgrade note that the new CORS allowlist rejects previously-allowed cross-domain REST clients until their origin is added to CORS_ALLOWED_ORIGINS. test(offline): cover make-offline ancestor-walk + dedup — a real-ancestor case exercising the ancestorId===pageId guard (page warmed once), the dedup of repeated tree failures into a single "tree" label, and the "breadcrumbs" label when the breadcrumbs lookup rejects. test(auth): cover clearOfflineCache in handleLogout — purged exactly once before window.location.replace, and a thrown purge error does not block the redirect. conventions: use pageKeys.detail() instead of raw ["pages", …] literals in title-editor and use-page-collab-providers. cleanup: remove the dead emit() in title-editor (the gateway ignores it; the cross-user tree refresh is server-side via the Yjs title fragment); drop the trivial Array.isArray(tiptapExtensions) test (schema is exercised transitively). refactor: extract the shared page.<id> Yjs doc-name convention into pageYdocName()/PAGE_YDOC_NAME_PREFIX so the editor providers, offline warm, and offline purge can no longer drift apart. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>