feat: add session-scoped client tool waits

backend/services/tool_executor.py

@@ -213,6 +213,7 @@ class ToolExecutor:
                 arguments,
                 timeout_seconds=float(config.get("timeout_seconds") or 3),
                 wait_for_response=policy.wait_for_response,
+                response_wait_mode=policy.response_wait_mode,
             )
         except ClientToolError as exc:
             raise ToolExecutionError(str(exc)) from exc