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Fix layerwise SGDM matrix decay grouping - #175
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The layerwise SGDM test correctly exposed that a block contains both matrix parameters and bias/LayerNorm parameters, so a single block role cannot have one weight-decay value. Split each LR role into matrix and bias/LayerNorm optimizer groups while preserving the same block LR multiplier. Matrices retain 3e-5 decay; biases/LayerNorm retain zero decay. Update regression assertions accordingly.