Support bit-exact INT8 matrix multiplication via INT4 building blocks in QWIX - #371
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… in QWIX - Support Karatsuba signed INT8 GEMM (3 native INT4 passes) matching exact INT8 product. - Support Naive signed INT8 GEMM (4 native INT4 passes) matching exact INT8 product. - Support microscaled mxint8 block emulation via INT4 building blocks with block-scale products. - Add unit tests verifying 100% bit-exact equivalence (0 max diff) to signed INT8 GEMM across random and edge-case inputs. PiperOrigin-RevId: 981365884
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Support bit-exact INT8 matrix multiplication via INT4 building blocks in QWIX