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:c7eebf116e107473a84c4c5d6abe2aee7f0fcb14e43bfa582f007e191e90ea52
-size 492897
+oid sha256:e789c5d86b41bf6d17cf483286c7d2dbc5b09d95ca9da448896eb3d8d38e2efd
+size 492941