Fix push_to_hub: use upload_folder instead (create_model_card kwarg compat)

app.py

@@ -143,7 +143,7 @@ def run_training():
                 api.create_repo("OpenCircuit/bf-router", exist_ok=True)
             except Exception:
                 pass
-            trainer.push_to_hub(repo_id="OpenCircuit/bf-router", token=hf_token)
+            api.upload_folder(folder_path=out_dir, repo_id="OpenCircuit/bf-router", repo_type="model", token=hf_token, commit_message="Upload BF-Router v0.5 QLoRA adapter (Qwen3-4B)")
             log("Model pushed to Hub!")
 
         status["state"] = "complete"