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Quantize BF16 dispatch payloads to FP8 E4M3 with format-defined block scales while preserving BF16 expert outputs for combine. Clean up the sender structure, payload metadata, vector conversions, Python API, and multi-rank coverage. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: efbacae6-f679-430b-bc16-b45ae162fc76