Validate served model name consistency

src/aituner/spec.py

@@ -576,7 +576,7 @@ class StudySpec:
 
     @classmethod
     def from_dict(cls, data: Mapping[str, Any]) -> "StudySpec":
-        return cls(
+        study = cls(
             study_id=_require_str(data.get("study_id"), context="study_id"),
             hardware=HardwareSpec.from_dict(
                 _require_mapping(data.get("hardware"), context="hardware")
@@ -595,6 +595,14 @@ class StudySpec:
             if data.get("capability_profile_path")
             else None,
         )
+        served_model_name = str(study.engine.base_flags.get("served-model-name") or "").strip()
+        if served_model_name and served_model_name != study.model.served_model_name:
+            raise SpecError(
+                "model.served_model_name must match engine.base_flags['served-model-name'] "
+                f"when both are set. Got model.served_model_name={study.model.served_model_name!r} "
+                f"and engine.base_flags['served-model-name']={served_model_name!r}."
+            )
+        return study
 
 
 @dataclass(frozen=True)