Add model card and usage instructions

README.md

@@ -118,7 +118,8 @@ The released core was recovered from git commit
 `65c18ee5868ced87a27d048261e237632ad5d704`, with network naming adjusted to LTF.
 This verifies checkpoint identity and runtime compatibility, not bit-for-bit
 reproduction of the original training process. This Hub adaptation adds
-tensor-only checkpoint loading and removes a machine-specific dataset path.
+tensor-only checkpoint loading, preserves the model root in symlink-based Hub
+caches, and removes a machine-specific dataset path.
 
 ## Limitations