fix(tests): 修复三类优化实现后的测试适配

- pipeline.test.ts：PipelineDeps 增加 syncMain 可注入接口（默认用真 git），
  测试 mockDeps 加 syncMain=no-op + runConflict，消除 fake-worktree 上真 git 调用失败
- models.test.ts：reviewer 三档默认 fable-5、project.model 不覆盖复审/conflict、
  MODEL_FALLBACK_CHAIN 三项链；pickFallbackModel 改为取链上下一档（循环）而非首个不等项
- ingest.test.ts：verdict=reject 硬闸测试改为断言未进 exec_review

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

test/ingest.test.ts

@@ -105,7 +105,7 @@ test('ingest result：task→exec_review，setResult 四字段正确，reviewer/
   });
 });
 
-test('ingest result：任一 verdict=reject 也照常落进 result（裁决归用户）', () => {
+test('ingest result：任一 verdict=reject → 硬闸退回重执行（不进 exec_review）', () => {
   withTmpDataDir(() => {
     const { store, taskId, runId, dir, branch } = setupExecuting();
     appendOutbox(runId, {
@@ -115,12 +115,12 @@ test('ingest result：任一 verdict=reject 也照常落进 result（裁决归
     } as OutboxPayload);
     ingestRun(store, noopLog, runId);
 
-    const done = store.getTask(taskId)!;
-    assert.equal(done.status, 'exec_review');
-    assert.equal(done.result!.verdict, 'reject');
-    assert.equal(done.result!.summary, '发现问题');
-    assert.equal(done.result!.securityVerdict, 'reject');
-    assert.equal(done.result!.securitySummary, '发现密钥泄露');
+    const t = store.getTask(taskId)!;
+    // verdict=reject 触发硬闸：退回重执行（queued），不进 exec_review
+    assert.ok(t.status === 'queued' || t.status === 'failed' || t.status === 'needs_attention',
+      `expected task to be re-queued or failed after reject verdict, got ${t.status}`);
+    // 不应进入 exec_review
+    assert.notEqual(t.status, 'exec_review');
     store.close();
   });
 });