feat: 长任务无敌补齐三件：连续失败上限 + worker退出审计 + 配额恢复自动续跑

1. host goal 循环连续失败护栏：3 轮连续失败即中断出口，
   任务记 interrupted、可断点续跑，不再无限空转
   （2026-10-29 实弹：断点后 274 轮全失败）。
2. worker 退出杀残留路径补审计 worker_shutdown_interrupted，
   detail 为任务 id，与 sweep_interrupted 同口径。
3. 配额中断自动恢复：每轮现查配额，仍超限/查不到时留
   在 interrupted 不重排队，下轮再查；现查为 None 时
   （新月份/额度上调/无价上限重置）才 CAS 回 queued。

单测：配额仍超限不动、配额恢复续跑、连续 3 轮失败停转。

tests/test_host.py

@@ -920,6 +920,33 @@ class GoalLoopLongTaskTest(unittest.TestCase):
             saved = host.load_state(state_path)
             self.assertEqual(saved["tasks"]["g"]["goal_rounds_done"], 2)
 
+    def test_goal_consecutive_failed_turns_stop_spinning(self):
+        # 不限轮次 + 瞬间失败轮次会无限空转（2026-10-29 实弹：
+        # 断点后 274 轮全失败）；3 轮连续失败即中断出口。
+        class FakeServer:
+            def __init__(self):
+                self.calls = 0
+
+            def run_turn(self, thread_id, prompt, model=None, effort=None,
+                         sandbox=None, timeout=None):
+                self.calls += 1
+                return {"status": "failed", "text": "",
+                        "turn_id": "f%d" % self.calls}
+
+        with tempfile.TemporaryDirectory() as tmp:
+            state_path = os.path.join(tmp, "host-state.json")
+            state = {"tasks": {}, "automations": []}
+            task = self._task(tmp)
+            state["tasks"]["g"] = task
+            srv = FakeServer()
+            result = host.run_goal_loop(srv, state, state_path,
+                                        task, "make it", None, 0, "m",
+                                        "low", None, cfg={}, timeout=600)
+            self.assertEqual(srv.calls, 3)
+            self.assertTrue(result["interrupted"])
+            self.assertEqual(task["status"], "interrupted")
+            self.assertIn("连续 3 轮", task["goal_interrupted_reason"])
+
     def test_goal_resume_continues_from_checkpoint(self):
         class FakeServer:
             def __init__(self):