0cd3c3b488
Lets a game define how its state becomes an observation as a plain Python function (module:attr), used identically by GameEnvironment (training) and TrainedPolicy (inference) instead of two independently maintained encoding paths. Removes the egocentric/egocentric_player/ egocentric_radius flags — cropping is now something an observation_function does itself by calling egocentric_board(), and extras_size is discovered from one sampled observation instead of being configured via observe_state_sizes.
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