Add SVD quant for Quark - #957
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The a8w4 kernel referenced kernels.mma.* (old flat layout) which does not exist in the kernels/gemm + kernels/common layout, so the module failed to import. Point the imports at kernels.common.mma.*. Also forward the epilogue kwarg (none/bias/bias_relu/bias_silu/bias_gelu) from compile_preshuffle_gemm_a8w4 to compile_preshuffle_gemm_a8 so Quark's fused-bias w4a8 path works.
Port the fused epilogue (none/bias/bias_relu/bias_silu/bias_gelu, tanh-approx GELU) into launch_gemm: add arg_bias + epilogue constexpr, fold per-N bias and activation into the C store in f32. Bit-identical to the dedicated preshuffle_gemm_a8w4 bias path (cosine 1.0); activations match torch. Add tests/kernels/test_a8w4_preshuffle.py covering the fp8-A path against a bf16 reference (cosine/max/min/abs/pct metrics, ragged M, 3x repeatability) and all epilogue variants. Drop the stale 'fp8-A not yet supported' skip in test_preshuffle_gemm.py (that test only ever launches fp4-A; a8w4 is now covered by the new file). fp8-A works and is bit-exact vs the dedicated a8w4 kernel. Note: tile_n=64 is a known-degraded config (cosine ~0.957 vs bf16) tracked separately; the small-N test case relaxes its cosine floor accordingly.
Provide the gfx950 fused low-rank epilogue required by Quark without expanding the generic MXFP4 GEMM path. Co-authored-by: Cursor <cursoragent@cursor.com>
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