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 sha256:8f20fefc89d01bf4b150a9016cc8c1028bae195eade7294c0761b25386b7c60a
-size 508129
+oid sha256:0e8389bdfe107aa70bc8c7413e8785b83579a2fbb4c0e867306e4725692ac19a
+size 508109