onnxruntime

c5aa86e1 - [WebNN EP] Support 8-bit MatMulNBits (#29025)

[WebNN EP] Support 8-bit MatMulNBits (#29025) Add support for 8-bit quantized weights (bits=8) in the MatMulNBits op builder. Previously only 4-bit was supported. The 8-bit path uses uint8 block size and scales the dequantized values appropriately.