Add background audits of the default branch's newest commit

internal/agents/lead.go

@@ -368,6 +368,12 @@ func (m *Manager) Observe(events []api.Event) {
 				go m.promptReady(id, nil)
 			}
 		}
+		switch {
+		case (ev.Kind == "task.merged" || ev.Kind == "task.merged_to_main" || ev.Kind == "task.discarded") && ev.ProjectId != nil:
+			go m.audit(*ev.ProjectId)
+		case ev.Kind == "task.discard_suggested" && ev.TaskId != nil:
+			go m.dismissAudit(*ev.TaskId)
+		}
 		switch ev.Kind {
 		case "inbox.created", "inbox.updated", "task.created", "task.merge_queued", "task.merge_after_review", "task.merge_after_review_cancelled", "task.merge_after_review_dropped", "task.merge_started", "task.merged", "task.discarded", "turn.ended", "task.workflow_stage", "task.workflow_finished", "review.started", "review.finished", "task.state", "task.ready", "task.discard_suggested":
 		case "task.ready_cleared":
@@ -416,6 +422,10 @@ func (m *Manager) signal(ctx context.Context, batch []api.Event) error {
 	if err != nil {
 		return err
 	}
+	batch, err = m.dropBackground(ctx, batch)
+	if err != nil || len(batch) == 0 {
+		return err
+	}
 
 	texts := []string{}
 	for _, ev := range batch {
@@ -464,6 +474,23 @@ func (m *Manager) signal(ctx context.Context, batch []api.Event) error {
 	return nil
 }
 
+func (m *Manager) dropBackground(ctx context.Context, batch []api.Event) ([]api.Event, error) {
+	kept := []api.Event{}
+	for _, ev := range batch {
+		if ev.TaskId != nil {
+			task, err := m.store.GetTask(ctx, *ev.TaskId)
+			if err != nil {
+				return nil, err
+			}
+			if task.Background {
+				continue
+			}
+		}
+		kept = append(kept, ev)
+	}
+	return kept, nil
+}
+
 func quietSignal(ev api.Event) bool {
 	switch ev.Kind {
 	case "task.state", "review.started":