feat(retry+decompose): 范围型驳回不重试 + 拆解 prompt 补 scope 铁律

- ingest：复审 reject 时若任务有 scopeFiles 且理由命中越界/范围外/声明范围等标记 → 判为范围型驳回，调 store.failScopeReject 直接转 needs_attention（清退避、不进重试链），因 executor 碰不了范围外文件、重试必然同样被驳回；- store.failScopeReject：补记 failed run 承载原因 + 直转 needs_attention（带单测）；- runner 拆解 prompt：加「files 范围铁律」——覆盖全跨层足迹 / 后端能力别塞前端范围 / 宁空勿窄 / 全或空。

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

test/store.test.ts

@@ -163,6 +163,25 @@ test('markReeval（规则13）：executing → needs_attention，收尾 run 为
   s.close();
 });
 
+test('failScopeReject（范围型驳回）：直接 needs_attention、不进重试链、清退避，记一条 failed run 承载原因', () => {
+  const s = freshStore();
+  const p = s.createProject({ name: 'scoperej', repoPath: '/tmp/scoperej-' + Math.random() });
+  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'easy', scopeFiles: ['design/**'] });
+  s.setOperations(t.id, 'op');
+  s.transition(t.id, 'queued');
+  s.transition(t.id, 'executing');
+
+  const after = s.failScopeReject(t.id, '复审因范围不足驳回（停止重试）：Scope A entirely undone');
+  assert.equal(after.status, 'needs_attention', '范围型驳回应直接转 needs_attention（不重试）');
+  assert.equal(after.nextEligibleAt, null, '应清退避、不进重试链');
+
+  // 补记一条 failed executor run 承载原因（供 UI lastRunError 兜底）
+  const failed = s.listRuns(t.id).filter((r) => r.kind === 'executor' && r.status === 'failed');
+  assert.equal(failed.length, 1, '应补记一条 failed executor run');
+  assert.match(failed[0].error ?? '', /范围不足/);
+  s.close();
+});
+
 test('reconcileInterrupted：执行中被 cancel 的任务仍挂 started run → 仅收尾不崩（绝不非法 cancelled→failed）', () => {
   const s = freshStore();
   const p = s.createProject({ name: 'recon', repoPath: '/tmp/recon-' + Math.random() });