Add run-scoped skill and prompt asset management

backend/services/gateway.py

@@ -219,6 +219,8 @@ class Gateway:
                     await self._send_initial_state(websocket)
                 elif msg_type == "start_backtest":
                     await self._handle_start_backtest(data)
+                elif msg_type == "reload_runtime_assets":
+                    await self._handle_reload_runtime_assets()
 
         except websockets.ConnectionClosed:
             pass
@@ -236,6 +238,19 @@ class Gateway:
             task.add_done_callback(self._handle_backtest_exception)
             self._backtest_task = task
 
+    async def _handle_reload_runtime_assets(self):
+        """Reload prompt assets and active skills without restarting the server."""
+        result = self.pipeline.reload_runtime_assets()
+        await self.state_sync.on_system_message(
+            "Runtime assets reloaded.",
+        )
+        await self.broadcast(
+            {
+                "type": "runtime_assets_reloaded",
+                **result,
+            },
+        )
+
     async def broadcast(self, message: Dict[str, Any]):
         """Broadcast message to all connected clients"""
         if not self.connected_clients: