Add RewardBench 2 result: 25.3 average (random floor) with full protocol - the OOD boundary measured on a third-party benchmark

Fix tokenizer_config compatibility: drop list-form extra_special_tokens (crashes transformers 4.x; tokens remain declared in their standard fields)

Add reward_train_max_length: 512 so the calibration regime ships with the weights

Fix usage snippet: pairwise comparison, not absolute score; add chance floor + public baseline rows

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