refactor(box): launch box runtime via the lbp CLI subcommand

Mirror the plugin runtime: box is now started through the same CLI entry
point (langbot_plugin.cli) instead of the box module directly.

- docker-compose.yaml: langbot_box command runs `langbot_plugin.cli ... box`
  (WebSocket is the default transport, no flag needed — matches `rt`).
- box/connector.py: both subprocess launch sites (_start_local_stdio and
  the Windows _start_subprocess_then_ws path) invoke
  `langbot_plugin.cli.__init__ box`, using `-s` for the stdio transport.
- docs/review: update stale `-m langbot_plugin.box[.server]` references.

Pairs with the SDK change that removes box's direct-launch entry points
(python -m langbot_plugin.box / .box.server) and the legacy --mode flag.

docker/docker-compose.yaml

@@ -43,7 +43,12 @@ services:
       # The Box runtime does NOT read box.local.* from config.yaml or env; it
       # receives its configuration from LangBot via the INIT RPC action.
       # Do not add LANGBOT_BOX_* / BOX__* here — they would be silently ignored.
-    command: ["uv", "run", "--no-sync", "-m", "langbot_plugin.box", "--mode", "ws"]
+    # Launched through the same CLI entry point as the plugin runtime
+    # (`langbot_plugin.cli.__init__ <subcommand>`). WebSocket is the default
+    # control transport — mirrors `rt`, which also runs with no flag. Pass
+    # `-s` / `--stdio-control` only for the stdio mode LangBot uses outside
+    # containers.
+    command: ["uv", "run", "--no-sync", "-m", "langbot_plugin.cli.__init__", "box"]
     networks:
       - langbot_network
 

docs/review/box-architecture.md

@@ -142,7 +142,7 @@ BoxService
 
 管理与 Box Runtime 的通信连接：
 
-- **本地 stdio**: Unix/macOS 默认路径，fork `python -m langbot_plugin.box --port {port}` 子进程
+- **本地 stdio**: Unix/macOS 默认路径，fork `python -m langbot_plugin.cli.__init__ box -s --ws-control-port {port}` 子进程（与 plugin runtime 统一走 `lbp` CLI 入口）
 - **本地 subprocess + WS**: Windows 本地（asyncio ProactorEventLoop 不支持 stdio pipe）
 - **远程 WebSocket**: Docker 部署 / `box.runtime.endpoint` 显式配置时，连接 `ws://{host}:{port}/rpc/ws`
 - **同步等待**: `asyncio.Event` + `wait_for(timeout=30s)` 模式确认连接

docs/review/box-vs-plugin-runtime.md

@@ -75,7 +75,7 @@ else:
 ```
 connector._start_local_stdio()
   ├─ connected = asyncio.Event()
-  ├─ ctrl = StdioClientController(python, ['-m', 'langbot_plugin.box.server', '--port', N])
+  ├─ ctrl = StdioClientController(python, ['-m', 'langbot_plugin.cli.__init__', 'box', '-s', '--ws-control-port', N])
   ├─ _ctrl_task = create_task(ctrl.run(callback))
   │    callback:
   │      handler = Handler(connection)          ← 基础 Handler, 无 disconnect_callback

src/langbot/pkg/box/connector.py

@@ -181,7 +181,10 @@ class BoxRuntimeConnector(ManagedRuntimeConnector):
 
         ctrl = StdioClientController(
             command=python_path,
-            args=['-m', 'langbot_plugin.box.server', '--stdio-control', '--ws-control-port', str(self._relay_port)],
+            # Launched through the same CLI entry point as the plugin runtime
+            # (cli.__init__ <subcommand>); `-s` selects the stdio transport,
+            # mirroring `rt -s`.
+            args=['-m', 'langbot_plugin.cli.__init__', 'box', '-s', '--ws-control-port', str(self._relay_port)],
             env=env,
         )
         self._ctrl_task = asyncio.create_task(
@@ -207,10 +210,13 @@ class BoxRuntimeConnector(ManagedRuntimeConnector):
             env['LANGBOT_BOX_CONFIG'] = json.dumps(self._filtered_box_config)
 
         python_path = sys.executable
+        # Launched through the same CLI entry point as the plugin runtime
+        # (cli.__init__ <subcommand>); no flag => WebSocket transport.
         self.runtime_subprocess = await asyncio.create_subprocess_exec(
             python_path,
             '-m',
-            'langbot_plugin.box.server',
+            'langbot_plugin.cli.__init__',
+            'box',
             '--ws-control-port',
             str(self._relay_port),
             env=env,