feat: 线程等待与状态读取 8 项（wait/read/message/handoff/worktree/pr-checks/automation/sleep）

对照 Codex app：wait_threads 首变+afterCursor+8上限、
read_thread 详情摘要、send_message_to_thread 复活失败任务、
handoff 登记与上报轮询、worktree 派生状态、PR checks JSON+
check-runs 日志与注释、automation GET/PATCH、clock.sleep
（API+host）。诚实边界见 docs/thread-wait-ops.md：无
worktree 阶段流、无 automation 变化静默、无独立测试结果
记录、handoff 服务端不执行迁移、wait 仅数据库级变化检测。

三套件：cloud 940 OK（4 跳过）、host 91 OK、deploy 29 OK

tests/test_host_sleep.py

@@ -0,0 +1,52 @@
+import io
+import json
+import os
+import sys
+import tempfile
+import unittest
+from contextlib import redirect_stdout
+from pathlib import Path
+from unittest import mock
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO_ROOT))
+
+import host
+
+
+class HostSleepTest(unittest.TestCase):
+    def _run(self, cli_args):
+        with tempfile.TemporaryDirectory() as tmp:
+            state_path = os.path.join(tmp, "host-state.json")
+            with open(state_path, "w", encoding="utf-8") as f:
+                json.dump({"tasks": {}, "automations": []}, f)
+            cfg_path = os.path.join(tmp, "cfg.json")
+            with open(cfg_path, "w", encoding="utf-8") as f:
+                json.dump({"state": state_path}, f)
+            argv = ["host.py", "--config", cfg_path,
+                    "--state", state_path] + cli_args
+            out = io.StringIO()
+            code = 0
+            with mock.patch.object(host, "Server",
+                                   lambda **kw: mock.MagicMock()):
+                with mock.patch.object(sys, "argv", argv):
+                    with redirect_stdout(out):
+                        try:
+                            host.main()
+                        except SystemExit as e:
+                            code = e.code if isinstance(e.code, int) else 1
+            return code, out.getvalue()
+
+    def test_sleep_zero(self):
+        code, out = self._run(["sleep", "--seconds", "0"])
+        self.assertEqual(code, 0)
+        self.assertEqual(json.loads(out),
+                         {"slept_seconds": 0.0, "interrupted": False})
+
+    def test_sleep_out_of_range(self):
+        code, _out = self._run(["sleep", "--seconds", "61"])
+        self.assertEqual(code, 1)
+
+
+if __name__ == "__main__":
+    unittest.main()