Model Checkpointing

Add checkpoints for the asteroids, so that there is a standard mode where the pre-existing model weights are used, rather than letting asteroids evolve through the gameplay.

Look for the model training and gameplay loop in the codebase, likely in files like train.py or game.py. Understand how asteroids currently evolve and where model weights are stored. Implementing checkpointing will involve saving/loading weights and modifying the game mode to use pre-trained weights instead of evolving during play.

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