fix(terminal): remove duplicate WebSocket read loop, let terminal_manager handle I/O

apps/api/src/api/terminal.py

@@ -1,5 +1,6 @@
 """WebSocket terminal endpoint for tool instances."""
 
+import asyncio
 import logging
 import uuid
 
@@ -82,16 +83,10 @@ async def terminal_websocket(
         # Send connected status
         await websocket.send_json({"type": "status", "status": "connected"})
 
-        # Keep connection alive until closed
-        while True:
-            try:
-                message = await websocket.receive()
-                if message["type"] == "websocket.disconnect":
-                    break
-            except WebSocketDisconnect:
-                break
-            except RuntimeError:
-                break
+        # Keep connection alive until session ends
+        # The terminal_manager handles I/O loops, we just wait here
+        while session.is_alive() and not session._closed:
+            await asyncio.sleep(0.5)
 
     except Exception as exc:
         logger.error("Terminal session error for instance %s: %s", instance_id, str(exc), exc_info=True)