Add background audits of the default branch's newest commit

internal/agents/manager.go

@@ -84,6 +84,8 @@ type Manager struct {
 
 	workflowMu sync.Mutex
 
+	auditMu sync.Mutex
+
 	previewMu        sync.Mutex
 	previewListeners map[int]*previewListener
 
@@ -475,6 +477,7 @@ func (m *Manager) Recover(ctx context.Context) error {
 	go m.deliverAllQueued(context.Background())
 	go m.startHeldMerges(context.Background())
 	go m.recoverMergeAfterReviews(context.Background())
+	go m.auditAll(context.Background())
 	return nil
 }