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The 2026-05-08 trace caught an audit row with actor=main-pm but
agent_role=cell_pm — the caller had supplied the verb's *expected*
role rather than the actor's actual role. Forensics work that joined
audit_log on agent_role would silently miscategorize the row.
Fix: AuditService now reads the actor's role directly from
agents.role at write time via the new _resolve_actor_role_from_db
helper. Wired into log_task_action_denial,
log_state_transition_denial, and log_notification_denial. The
caller-supplied role param is kept as a best-effort fallback for the
case where the DB lookup fails (singleton-without-DB paths,
permission errors, etc.) so audit writes never block the operation
being audited.
Coverage:
- 3 unit tests (test_audit.py) for the no-DB / invalid-id paths
- 1 unit-with-real-DB test (test_audit_real_query.py) verifying
the persisted row's agent_role is read from DB even when the
caller passes a deliberately-wrong role
- 1 unit-with-real-DB test for the no-row case
Tests: 3135 passing, 100% coverage, ruff clean.