Move lead delivery and the Merge & continue hold onto the coordinator

internal/agents/compact.go

@@ -33,16 +33,20 @@ func (m *Manager) Compact(ctx context.Context, sessionID, model string) (api.Age
 	if err != nil {
 		return api.AgentSession{}, err
 	}
+	err = m.startRunning(ctx, sess, "byre")
+	if err != nil {
+		return api.AgentSession{}, err
+	}
+	return m.launchCompaction(ctx, sess, task, model)
+}
+
+func (m *Manager) launchCompaction(ctx context.Context, sess api.AgentSession, task api.Task, model string) (api.AgentSession, error) {
 	prompt := handoffPrompt
 	if sess.Owner != "" {
 		prompt = leadHandoffPrompt
 	}
-	err = m.startRunning(ctx, sess, task.Id, "byre")
-	if err != nil {
-		return api.AgentSession{}, err
-	}
 	m.mu.Lock()
-	m.handoffModel[sessionID] = model
+	m.handoffModel[sess.Id] = model
 	m.mu.Unlock()
 	return m.launch(ctx, sess, task, "byre", prompt, "", "", nil)
 }