feat: MXFP8 epilogue fusion for SM100 (B200)#1

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gemm_mxfp8_out_tma

Commits on Apr 10, 2026

feat: MXFP8 epilogue fusion — gmem direct write

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perf: replace gmem direct write with TMA store in MXFP8 epilogue

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test: fair comparison with compiled graph baseline (fullgraph=True)

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chore: remove dev artifacts, keep only impl + test + yaml

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