Sprint SPRINT_20260408_004 AUDIT-004 documentation criterion.
docs/modules/timeline/audit-retention.md covers:
- Four-rung classification ladder and the "narrowest wins" rule
- Retention table structure, platform defaults, per-tenant overrides,
and legal holds via compliance_hold
- AuditRetentionPurgeService config + operator recommendations
- Right-to-erasure endpoint contract, hash-chain integrity guarantees,
and the idempotency semantics via pii_redacted_at
- Sequence-chain gap behaviour after purge and how chain verification
should window its checks
- Compliance checklist for operators
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
44195cd7af