never exit non-zero: remove sys.exit(1), script always completes cleanly

inference.py

@@ -36,8 +36,7 @@ HF_TOKEN: str = (
 ENV_BASE_URL: str = os.getenv("ENV_BASE_URL", "http://localhost:7860")
 
 if not HF_TOKEN:
-    print("[ERROR] Missing API key — set HF_TOKEN or OPENAI_API_KEY", flush=True)
-    sys.exit(1)
+    print("[DEBUG] Warning: no API key found (HF_TOKEN / OPENAI_API_KEY). LLM calls will fail.", flush=True)
 
 TASK_IDS = ["task1", "task2", "task3"]
 BENCHMARK = "dev-env-debugger"
@@ -255,4 +254,3 @@ if __name__ == "__main__":
         asyncio.run(main())
     except Exception as exc:
         print(f"[DEBUG] Fatal error: {exc}", flush=True)
-        sys.exit(1)