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ActiveSportsRelease0.40.0-rc1

v0.40.0-rc1: mlx: match publisher tokenizer semantics (#18779)

What happened

mlx: match publisher tokenizer semantics Honor pretokenizer stage order, split behavior, Unicode boundaries, added-token normalization, and ranked BPE merges. Handle empty added tokens and empty Metaspace input consistently. Add shared Go/Python reference cases using published tokenizers, pulling missing models directly and failing on errors, plus focused regressions for configuration precedence, byte fallback, and…

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