Document why deleteAll() alone left a freshly-posted entry 404-ing on its
edit-prefill API lookup (regular-pages index keyed on config->checksum, which
survives a create under cache.check.method:folder) and why the fix adds
Cache::invalidateCache(). Note the H1/M8 travelling:true coverage gap as a
tracked residual. Cross-link from bugs-and-fixes.md.
Code review F8 (learnings) + F5 (residual-gap tracking).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mpdu3Dt1iVoozHwAMyjrbn