fix: thread/unarchive 不再预 resume（已归档 thread 直接调 thread/unarchive）

host.py

@@ -2694,8 +2694,11 @@ def main():
                 print(json.dumps({"error": str(e)}, ensure_ascii=False))
                 raise SystemExit(1)
         elif args.cmd == "thread-unarchive":
+            # 与 archive 一致：不 resume，直接调 thread/unarchive。
+            # 已归档 thread 先 resume 会失败（thread/resume 报错 →
+            # CLI 退出 1 → 服务端回 502），而 unarchive 本身只认
+            # threadId，不需要先恢复会话。
             try:
-                srv.resume_thread(args.thread_id)
                 resp = srv.request("thread/unarchive",
                                    {"threadId": args.thread_id},
                                    timeout=60)

tests/test_host_thread_cli.py

@@ -151,7 +151,7 @@ class ThreadCliTest(unittest.TestCase):
         calls = self._calls_before_close(fake)
         self.assertEqual(calls, [("archive", "th-1")])
 
-    def test_unarchive_resume_first(self):
+    def test_unarchive_no_resume(self):
         fake = FakeServer()
         code, out, _ = self._run(
             fake, ["thread-unarchive", "--thread-id", "th-1"])
@@ -159,7 +159,21 @@ class ThreadCliTest(unittest.TestCase):
         self.assertEqual(json.loads(out), {"thread": {"id": "th-1"}})
         calls = self._calls_before_close(fake)
         self.assertEqual(calls, [
-            ("resume", "th-1"),
+            ("request", "thread/unarchive", {"threadId": "th-1"}),
+        ])
+
+    def test_unarchive_resume_failure_does_not_block(self):
+        # 回归：已归档 thread 的 resume 会失败；unarchive 不再调
+        # resume，所以 resume 失败也不应挡住 unarchive（此前
+        # resume 抛错 → CLI 退出 1 → 服务端回 502）。
+        fake = FakeServer()
+        fake.resume_error = True
+        code, out, _ = self._run(
+            fake, ["thread-unarchive", "--thread-id", "th-1"])
+        self.assertEqual(code, 0)
+        self.assertEqual(json.loads(out), {"thread": {"id": "th-1"}})
+        calls = self._calls_before_close(fake)
+        self.assertEqual(calls, [
             ("request", "thread/unarchive", {"threadId": "th-1"}),
         ])