refactor: remove legacy assistant compatibility

backend/tests/test_client_tools.py

@@ -26,6 +26,10 @@ def client_tool() -> RuntimeTool:
             "schema_version": 1,
             "type": "client",
             "config": {
+                "allow_interruptions": True,
+                "execution_mode": "async",
+                "wait_for_response": True,
+                "response_wait_mode": "timeout",
                 "parameters": [
                     {
                         "name": "visible",
@@ -70,10 +74,10 @@ class FakeClientTools:
 
 class ClientToolExecutorTests(unittest.IsolatedAsyncioTestCase):
     def test_response_wait_mode_defaults_and_uses_camel_case(self):
-        legacy = ClientToolConfig()
+        default_config = ClientToolConfig()
         session = ClientToolConfig(responseWaitMode="session")
 
-        self.assertEqual(legacy.response_wait_mode, "timeout")
+        self.assertEqual(default_config.response_wait_mode, "timeout")
         self.assertEqual(session.response_wait_mode, "session")
         self.assertEqual(
             session.model_dump(by_alias=True)["responseWaitMode"],