fix(orchestrator): 拆解未批准前冻结子任务——父任务 plan_review/analyzing 期间子任务不可领取

修复 bug：auto-approved 项目里 planner 拆解后子任务立即被领取执行，而父任务还在
plan_review 等人审批，导致拆解若被驳回则子任务已白跑。claimable 加闸：子任务的父任务
处于 plan_review(待审拆解)或 analyzing(拆解中)时冻结，批准(decomposed)后放行。
仅冻结这两态，不影响 todo-sync 等其它带 parentId 的流程。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/orchestrator.test.ts

@@ -415,6 +415,23 @@ test('claimable 纳入 analyzing：hard 任务派 planner-decompose', () => {
   store.close();
 });
 
+test('子任务在父任务 plan_review 期间不可领取，拆解批准（decomposed）后放行', () => {
+  const { store, projectId } = setup('auto-approved');
+  const parent = store.createTask({ projectId, title: 'epic', complexity: 'hard' });   // → analyzing
+  const child = store.createTask({ projectId, parentId: parent.id, title: 'sub', complexity: 'easy' });  // → ready
+  store.transition(parent.id, 'plan_review', { by: 'test' });   // 模拟拆解完成待审
+  const state = freshState();
+  const { deps } = mockDeps(state);
+  const orch = createOrchestrator(store, noopLog, deps);
+  orch.claimTick();
+  assert.equal(state.spawned.length, 0, '父任务 plan_review（拆解待审）期间，子任务不应被领取');
+  store.transition(parent.id, 'decomposed', { by: 'test' });    // 批准拆解
+  orch.claimTick();
+  assert.equal(state.spawned.length, 1, '拆解批准后子任务放行可领取');
+  assert.equal(store.listRuns(child.id).length, 1, '被领取的是该子任务');
+  store.close();
+});
+
 test('auto-easy 不做规划：medium(speccing) 不被领取', () => {
   const { store, projectId } = setup('auto-easy');
   const t = store.createTask({ projectId, title: 'feat', complexity: 'medium' });  // → speccing