Validate served model name consistency

tests/test_core_flow.py

@@ -256,6 +256,25 @@ class CoreFlowTests(unittest.TestCase):
             self.assertIn("There is no TTFT SLO for this study.", prompt)
             self.assertIn("decode-only", prompt)
 
+    def test_load_study_spec_rejects_mismatched_served_model_name(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            tmp_path = Path(tmp)
+            study_path = _write_study_assets(
+                tmp_path,
+                engine_overrides={
+                    "base_flags": {
+                        "host": "127.0.0.1",
+                        "port": 8000,
+                        "served-model-name": "engine-name",
+                    }
+                },
+            )
+            payload = json.loads(study_path.read_text(encoding="utf-8"))
+            payload["model"]["served_model_name"] = "trace-name"
+            study_path.write_text(json.dumps(payload), encoding="utf-8")
+            with self.assertRaisesRegex(SpecError, "must match engine.base_flags"):
+                load_study_spec(study_path)
+
     def test_bailian_endpoint_defaults(self) -> None:
         endpoint = LLMEndpointSpec.from_dict({"provider": "bailian", "model": "qwen-plus"})
         self.assertEqual(endpoint.provider, "bailian")