Collapse handoff turns in the transcript instead of streaming them

internal/agents/manager.go

@@ -587,6 +587,10 @@ func (m *Manager) message(ctx context.Context, l *live, actor, text string, imag
 	if len(images) > 0 {
 		payload["images"] = images
 	}
+	compacting := isHandoffPrompt(actor, text)
+	if compacting {
+		payload["handoff"] = true
+	}
 	err := m.emit(ctx, l, actor, "user.message", payload)
 	if err != nil {
 		return err
@@ -597,7 +601,7 @@ func (m *Manager) message(ctx context.Context, l *live, actor, text string, imag
 	l.asked = false
 	l.bounced = false
 	l.wantCompact = false
-	l.compacting = isHandoffPrompt(actor, text)
+	l.compacting = compacting
 	l.rateLimited = nil
 	m.mu.Unlock()
 

internal/agents/manager_test.go

@@ -587,6 +587,9 @@ func TestCompactCarriesHandoff(t *testing.T) {
 				t.Fatalf("handoff turn.ended %v: want handoff and no inbox summary", ev.Payload)
 			}
 		}
+		if ev.Kind == "user.message" && ev.Actor == "byre" && *ev.AgentSessionId == old.Id && ev.Payload["handoff"] != true {
+			t.Fatalf("handoff prompt %v: want handoff flag", ev.Payload)
+		}
 	}
 
 	sessions, err := e.store.ListSessions(e.ctx, e.task.Id)