hf(esmfold2): patch config.json — type '<unset>' -> 'experimental'

config.json

@@ -86,5 +86,6 @@
     "train_noise_log_mean": -1.2,
     "train_noise_log_std": 1.5
   },
-  "transformers_version": "4.57.6"
-}
+  "transformers_version": "4.57.6",
+  "type": "experimental"
+}