Merge branch 'main' into last

inference.py

@@ -65,9 +65,9 @@ except ImportError:
 
 # ── Env-var config (checklist-specified names) ────────────────────────────────
 API_BASE_URL = os.environ.get("API_BASE_URL", "https://api.openai.com/v1")
-MODEL_NAME   = os.environ.get("MODEL_NAME", "gpt-4o-mini")  # or gpt-4o
-HF_TOKEN     = os.environ.get("HF_TOKEN",     "")
-OPENAI_API_KEY = os.environ.get("OPENAI_API_KEY", "no-key-set")
+MODEL_NAME   = os.environ.get("MODEL_NAME",   "gpt-4o")
+HF_TOKEN     = os.environ.get("HF_TOKEN")
+_API_KEY     = HF_TOKEN or os.environ.get("OPENAI_API_KEY", "no-key-set")
 
 # ── Task registry ─────────────────────────────────────────────────────────────
 _TASKS: Dict[str, Dict[str, Any]] = {
@@ -386,4 +386,4 @@ if __name__ == "__main__":
     args = p.parse_args()
 
     task_list = [args.task] if args.task else ["easy", "medium", "hard"]
-    run_baseline(tasks=task_list, num_episodes=args.n, seed_offset=args.seed)
+    run_baseline(tasks=task_list, num_episodes=args.n, seed_offset=args.seed)