* feat: save processor for multimodal models
VL models load via AutoModelForImageTextToText, but only the tokenizer was
saved/pushed, dropping the processor's image/audio preprocessing config.
Save/push it alongside the tokenizer so multimodal models stay complete.
* Update src/heretic/model.py
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
* Adjusted processor type to use ProcessorMixin
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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
