feat: implement AuditRepository for security audit log persistence #260
Description
Summary
The AuditLog exists in-memory (security/audit.py) but has no persistence via the PersistenceBackend. An AuditRepository protocol is planned.
Design Spec Reference
- §7.6 Entities Persisted table — Audit entries row (planned M7)
Scope
AuditRepositoryprotocol definition- SQLite implementation
- Integration with
PersistenceBackendprotocol - Queries: by agent, by action type, time range