feat: add gemma4-assistant arch — Gemma-4 MTP drafter for --spec-type draft-mtp#32

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lalalune wants to merge 7 commits into

fix/metal-tbq3-tbq4-attn-scorefrom

feat/gemma4-assistant-arch

Commits on Jun 24, 2026

feat(gemma4-assistant): add arch, tensors, hparams, model file, ctx_other seam

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claude
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feat(gemma4-assistant): KV-cache sharing seam + model dispatch + rope-type

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claude
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feat(gemma4-assistant): wire ctx_other=ctx_tgt for draft-mtp contexts

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claude
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fix(gemma4-assistant): correct MTP hidden-state feedback for real speedup

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chore(gemma4-assistant): drop now-unused n_embd local in output_reserve

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fix(fused-ffi): set ctx_other on the MTP draft context (gemma4-assistant)

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claude
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fix(diarizer): read pyannote LSTM gates in ONNX IOFC order, not PyTorch IFGO
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