fix: 断点丢失时 goal-resume 拒绝成 failed，阻断自动恢复空转

2026-10-29 长任务实弹：Docker goal 断点续跑在 host-state 里找
不到任务时抛 KeyError，worker 把无结论异常退出判 interrupted，
自动恢复再排队、再 KeyError，12 秒一轮空转 49 次（人工暂停
拦下，第 50 次人工续跑又烧掉），文件 32 章原样未动。
修法：host.py goal-resume 先查任务在不在 state 里，不在就打印
拒绝行、正常退出；sandbox 三处解析（本地、Docker resume、
Docker 断点）见拒绝行即判 failed 终态，不进自动恢复循环。
单测：host 缺任务拒绝不炸 + 三处解析拒绝判 failed。

cloud/sandbox.py

@@ -117,6 +117,19 @@ def _parse_goal_output(stdout):
     return None, None
 
 
+def _goal_resume_refusal(stdout):
+    """host.py goal-resume 的拒绝行（断点丢失时），无则返回 None。
+
+    断点丢失不是可续跑的中断：host-state 里没有任务，任何一次
+    续跑都会原样失败；调用方必须判 failed 终态，绝不能判
+    interrupted——否则 worker 自动恢复会 12 秒一轮空转到上限。
+    """
+    for line in (stdout or "").splitlines():
+        if line.startswith("goal-resume 拒绝："):
+            return line.strip()
+    return None
+
+
 def _goal_interrupted_reason(stdout):
     """goal interrupted 标记行的原因，无标记返回 None。
 
@@ -569,8 +582,13 @@ class LocalExecutor(Executor):
         stderr = getattr(result, "stderr", "") or ""
         met, goal_error = _parse_goal_output(stdout_full)
         interrupted_reason = _goal_interrupted_reason(stdout_full)
+        refusal = _goal_resume_refusal(stdout_full)
         combined = stdout_full + stderr
-        if "已存在" in combined:
+        if refusal is not None and met is None:
+            # 断点丢失拒绝：终态 failed，不进自动恢复（见 helper）。
+            met, goal_error = None, refusal
+            status = "failed"
+        elif "已存在" in combined:
             met, goal_error = None, (
                 "host 任务已存在：goal 失败请用继续而非重试——"
                 "同任务重试会撞已存在 host-state，worker 会先"
@@ -1388,7 +1406,12 @@ class DockerExecutor(Executor):
         stderr = getattr(result, "stderr", "") or ""
         met, goal_error = _parse_goal_output(stdout_full)
         interrupted_reason = _goal_interrupted_reason(stdout_full)
-        if interrupted_reason is not None:
+        refusal = _goal_resume_refusal(stdout_full)
+        if refusal is not None and met is None:
+            # 断点丢失拒绝：终态 failed，不进自动恢复（见 helper）。
+            status = "failed"
+            goal_error = refusal
+        elif interrupted_reason is not None:
             # host 侧已记 interrupted：异常中断不是失败，云端跟
             # 着记 interrupted，任务可 /goal-resume 断点续跑。
             status = "interrupted"
@@ -1484,7 +1507,12 @@ class DockerExecutor(Executor):
         stderr = getattr(result, "stderr", "") or ""
         met, goal_error = _parse_goal_output(stdout_full)
         interrupted_reason = _goal_interrupted_reason(stdout_full)
-        if interrupted_reason is not None:
+        refusal = _goal_resume_refusal(stdout_full)
+        if refusal is not None and met is None:
+            # 断点丢失拒绝：终态 failed，不进自动恢复（见 helper）。
+            status = "failed"
+            goal_error = refusal
+        elif interrupted_reason is not None:
             # host 侧已记 interrupted：异常中断不是失败，云端跟
             # 着记 interrupted，任务可 /goal-resume 断点续跑。
             status = "interrupted"