Correct active intervention engine provenance

runs/active-intervention-v0/prepare_prospective.py

@@ -28,6 +28,7 @@ REPLAY_TIME_SCALE = 0.5
 OFFERED_RATE_PER_GPU = 2.75
 TARGET_COUNT = round(OFFERED_RATE_PER_GPU * DURATION_S * TP)
 WINDOW_ID = "chat_w20260313_1000"
+ENGINE_VERSION = "0.24.1.dev3+g668cfb7e2"
 
 
 def atomic_json(path: Path, payload: Any) -> None:
@@ -140,7 +141,7 @@ def materialize_study(
     payload = json.loads(base_study.read_text(encoding="utf-8"))
     payload["study_id"] = f"active-intervention-trace13-rep{repetition}"
     payload["hardware"]["host_candidates"] = ["dash0"]
-    payload["engine"]["engine_version"] = "0.24.1.dev3+opprof"
+    payload["engine"]["engine_version"] = ENGINE_VERSION
     trace = payload["trace"]
     trace.update(
         {