Document the trip publish-toggle cache-invalidation finding: an in-place trip.md `published` edit under cache.check.method: folder + APCu driver stays stale because the folder checksum is unchanged AND the web APCu store is unreachable by a CLI clearcache — fixed with apcu_clear_cache() from the web request. Cross-link the sibling grav-deleteall doc (the create/delete case) as necessary-but-not-sufficient here, and add the Published/Draft trip status concept to CONCEPTS.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Mpdu3Dt1iVoozHwAMyjrbn