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:de074b1ccde9c1533815630a218ff97e4a61c0ca5f063b8a7e95b04a057191bb
-size 23777
+oid sha256:ca5cd896bf2459b5c8423040fc22773f0d02ae97966c4443a4d8e7c34a8c04a6
+size 24523