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
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-size 508109
+oid sha256:003a3a0c8be2a369f192ed7cdcd5648406fbf1b307e52f65da1ba9044ba31893
+size 508173