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Fix MX block quantization: row-local blocking, OCP shared exponent, element rounding - #321

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fix/mx-block-quantization

Commits on Aug 7, 2026
- Pad MX blocks per row so blocks never straddle row boundaries
  Shreyas8612
  committed
  af8c70d
- Use OCP-conformant shared exponents for MXFP and MXINT
  Shreyas8612
  committed
  eac1f5d
- Round minifloat elements directly instead of through a bit encoding
  Shreyas8612
  committed
  d56270c
- Add regression tests for MX block quantization
  Shreyas8612
  committed
  8ef03e4
- Apply black formatting
  Shreyas8612
  committed
  577a48f