[WS1] Add batch-invariant h_aggregate kernel - #366

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RL-Align:testfrom

Commits on Sep 1, 2026

feat: add batch-invariant MHC H Aggregate kernel
nodeeeeee
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dc9d4c6
feat: add MHC H Aggregate backward and gtest coverage
nodeeeeee
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1afadb6
fix: align MHC H Aggregate with FP32 contract
nodeeeeee
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38e3f82