Add MiniMax H3 support and ConvRot validation
Introduce MODEL_TYPE_MINIMAX_H3, keep-float/int4-sensitive presets, and automatic adapter detection; bump package version to 2.1.0 and update changelog. Add robust ConvRot group-size validation (_validate_convrot_group_size), stricter Hadamard shape checks, and improved error handling when loading/saving native INT8 ConvRot metadata. Add unit tests covering ConvRot metadata round-trips, invalid metadata rejection, save-time consistency checks, and MiniMax H3 detection.
ThereforeGames
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