Sprint SPRINT_20260408_004. AUDIT-004 flipped TODO → DOING with the first three completion criteria checked. Migration 005, classifier, retention purge host, and right-to-erasure endpoint all shipped across commits 44c0e2b34..AUDIT-004 (migration + store + endpoint) and the purge background host. Docs dossier + Doctor check deferred. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>