Add `agent.pt` and tag the environment

This commit adds a model that is compatible with the [🥇 Open RL Leaderboard 🥇](https://huggingface.co/spaces/open-rl-leaderboard/leaderboard).

agent.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:860d291561cecc79aa966cb7928e32a2bba1f5a27ba86453612c7f18a4cba67d
+oid sha256:5f5d018f118618e4c4d52f27e42f9331c3ee3277191e0969d5d458b99f7a2401
 size 6981705