fix(cloud): run runtime initialization outside transaction gate

src/langbot/pkg/core/app.py

@@ -310,12 +310,18 @@ class Application:
             self.logger.warning(f'Plugin runtime unavailable during startup; reconnecting in background: {exc}')
             self.plugin_connector.schedule_reconnect()
 
-    def _start_plugin_runtime_initialization(self):
-        return self.task_mgr.create_task(
+    def _start_plugin_runtime_initialization(self) -> asyncio.Task | None:
+        task = getattr(self, '_plugin_runtime_initialization_task', None)
+        if task is not None and not task.done():
+            return task
+        # This is application lifecycle work, not a request side effect. It must
+        # not wait on PersistenceManager's after-commit gate at boot.
+        task = asyncio.create_task(
             self._initialize_plugin_runtime(),
             name='plugin-runtime-initialization',
-            scopes=[core_entities.LifecycleControlScope.APPLICATION],
         )
+        self._plugin_runtime_initialization_task = task
+        return task
 
     async def run(self):
         self.event_loop_monitor.start()
@@ -544,6 +550,11 @@ class Application:
 
             if self.task_mgr is not None:
                 self.task_mgr.cancel_by_scope(core_entities.LifecycleControlScope.APPLICATION)
+            plugin_runtime_task = getattr(self, '_plugin_runtime_initialization_task', None)
+            if plugin_runtime_task is not None and not plugin_runtime_task.done():
+                plugin_runtime_task.cancel()
+                with contextlib.suppress(asyncio.CancelledError):
+                    await plugin_runtime_task
             with contextlib.suppress(Exception):
                 await self.event_loop_monitor.stop()
             mcp_mount = getattr(self.http_ctrl, 'mcp_mount', None)