fix(mcp): 异常面适配真实 bleak——重试/错误码映射覆盖异常全家

- C1: _run_with_retry 捕获面 TransportError → (base+local 两个 TransportError,
  BleakError, OSError, asyncio.TimeoutError)；真实掉线 bleak 裸抛
  BleakError("Not connected") 不再绕过重连重试
- C2/I1a: _map_transport_error 接受异常全家，类型优先（asyncio.TimeoutError、
  BleakDeviceNotFoundError → CONNECT_TIMEOUT）再按中英文消息映射；_call /
  scan_devices / device_status 的 except 同步扩展，device_status 不再把传输层
  错误兜底成 INTERNAL
- I2: _ensure_connected 的 __aenter__ 半途失败补 __aexit__，防半开连接泄漏
- M1: status() 先算 idle_seconds 再 _touch()，读数不再被自身归零
- docstring 校准：scan_devices 返回形状 data.devices；device_status 注明
  触发连接守候且刷新空闲计时
- 新测试 8 个（先红后绿）：raw BleakError 重连成功/耗尽上抛、aenter 清理、
  idle_seconds 语义、local 中文 TransportError 两条映射、raw BleakError 映射、
  device_status 传输错误映射

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

src/ppclock/device_manager.py

@@ -3,15 +3,27 @@
 - 一把 asyncio.Lock 串行所有设备操作（BLE 适配器独占）
 - 首次操作守候连接（connect_timeout 应覆盖设备 30-60s 广播窗口）
 - 操作后保持连接；空闲 idle_timeout 秒自动断开让设备睡眠
-- 操作中 TransportError（连接丢失）→ 重连并重试一次，再失败向上抛
+- 操作中连接丢失（TRANSPORT_ERRORS 全家）→ 重连并重试一次，再失败向上抛
 """
 from __future__ import annotations
 
 import asyncio
 import time
 
+from bleak.exc import BleakError
+
 from .client import PPClient
 from .transports.base import TransportError
+from .transports.local import TransportError as LocalTransportError
+
+# 传输层异常全家（掉线/未连上的全部真实形态）：
+# - transports.base.TransportError：SDK 公开语义异常（bridge/fake 路径）
+# - transports.local.TransportError：真实 BLE 路径 connect/scan/ID 应答的中文异常
+#   （SDK 两个同名类互不继承，历史包袱；MCP 层必须同时覆盖）
+# - bleak.exc.BleakError：写/读路径 bleak 裸抛不包装（如 "Not connected"）
+# - OSError / asyncio.TimeoutError：bleak 后端平台差异形态
+TRANSPORT_ERRORS = (TransportError, LocalTransportError, BleakError,
+                    OSError, asyncio.TimeoutError)
 
 
 class DeviceManager:
@@ -43,12 +55,14 @@ class DeviceManager:
     async def status(self) -> dict:
         async with self._lock:
             await self._ensure_connected()
+            # 先算 idle_seconds 再 _touch：status 自身也是活动，但不能把读数归零
+            idle = (None if self._last_activity is None
+                    else round(time.monotonic() - self._last_activity, 1))
             self._touch()
             info = {
                 "connected": self.connected,
                 "mac": self._mac,
-                "idle_seconds": None if self._last_activity is None
-                else round(time.monotonic() - self._last_activity, 1),
+                "idle_seconds": idle,
                 "connect_count": self._connect_count,
                 "connect_timeout": self._connect_timeout,
                 "idle_timeout": self._idle_timeout,
@@ -71,7 +85,7 @@ class DeviceManager:
         await self._ensure_connected()
         try:
             return await op(self._client)
-        except TransportError:
+        except TRANSPORT_ERRORS:
             await self._drop()
             await self._ensure_connected()
             return await op(self._client)
@@ -80,7 +94,16 @@ class DeviceManager:
         if self._client is not None:
             return
         client = self._factory(self._mac, self._connect_timeout)
-        await client.__aenter__()
+        try:
+            await client.__aenter__()
+        except Exception:
+            # __aenter__ 半途失败（如 connect 后 start_notify 炸）会留下半开连接，
+            # 补一次 __aexit__ 清理；清理自身失败不影响原异常上抛
+            try:
+                await client.__aexit__(None, None, None)
+            except Exception:  # noqa: BLE001
+                pass
+            raise
         self._client = client
         self._connect_count += 1
         if self._mac is None:  # 自动扫描后记住实际地址