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DEBT-014: Duplicate detection & reconciliation tracking - Create operation_audit_trail migration (0011) - Hook OutboxPollerJob to detect and log duplicates - Implement MetricsSql queries for duplicate/reconciliation metrics DEBT-029: Audit trail consumer integration - Create AuditTrailConsumer for event-driven audit logging - Map 12+ event types to compliance.operation_audit_trail - Register consumer in Program.cs DI and OutboxPollerJob AGENTS.md v16.0 Compliance: ✅ Necessity: Both DEBT items from registry (2+3 pts) ✅ Simplicity: Event-driven via Outbox pattern (existing infra) ✅ Pattern: Vertical Slice consumer + SQL queries (established) ✅ Traceability: All event types documented and mapped ✅ Safety: Idempotent logging via ON CONFLICT DO NOTHING ✅ Maturity: Framework ready before feature implementation Impact: Medium/High (5 pts total, Q3 target 4 pts exceeded) Status: Code ready, awaiting SSH tunnel for migration test Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>