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:e915a4b28ce2dafeb8c96bba13173d3d71de4909ad3c411e53045d8d5db52d55
-size 28838
+oid sha256:76e6ecd24f34db1246d8c6f69397ee4c7af85dbe965ce84e73cdadebd36b0067
+size 30218