Support hybrid multi-pass quantization (mxfp8_16 Pass 1 + mxfp4 Pass 2) in QWIX - #372
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…2) in QWIX - Support residual_decompose_hybrid for multi-pass decomposition with heterogeneous precision rules across passes. - Support hybrid_fp8_fp4_multipass_dot using mxfp8_16 (block 16) for coarse Pass 1 and mxfp4 (block 32) for fine Pass 2. - Support multi-pass modes: 'triangular' (3 passes), 'full_cross' (4 passes), 'lhs_high_precision' (2 passes), 'rhs_high_precision' (2 passes), and 'reconstructed'. - Add unit tests verifying hybrid SQNR bounds (>42 dB for triangular, >44 dB for full cross) and residual decomposition accuracy. PiperOrigin-RevId: 981380857
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Support hybrid multi-pass quantization (mxfp8_16 Pass 1 + mxfp4 Pass 2) in QWIX