Granite Speech 4.1 2B NAR Portable INT4 for Taurscribe

This artifact is derived from IBM Granite Speech 4.1 2B NAR:

  https://huggingface.co/ibm-granite/granite-speech-4.1-2b-nar

Original model provider:
  IBM Granite Team

Original license:
  Apache License 2.0

Taurscribe modifications:
  - Copied the Granite ONNX model bundle and tokenizer assets.
  - Applied INT4 weight-only MatMulNBits quantization to selected MatMul weights.
  - Patched editor.onnx to output token_ids through in-graph ArgMax.
  - Flattened rank-5 windowed-attention MatMul operations to equivalent rank-3 operations for DirectML.
  - Baked fixed-bucket shape calculations as ONNX initializers and pruned dead shape nodes.
  - Replaced two-output GLU Split operations with equivalent Slice pairs for DirectML correctness.
  - Packaged the artifact for Taurscribe's ONNX Runtime DirectML and CPU paths.

No additional training or fine-tuning was performed by Taurscribe.