Re-implement FlashAttention with new Xe atoms#547

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petercad wants to merge 11 commits intomainfrom

petercad/rearch_sdpa

Commits on Oct 4, 2025

[Umbrella commit] Re-implement FlashAttention with new Xe atoms
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Commits on Oct 13, 2025

GQA indexing fix
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Commits on Oct 16, 2025

Commits on Oct 21, 2025

Fix NaNs in out-of-bounds k blocks
petercad
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Commits on Oct 24, 2025

More C++17 build fixes, misc changes
petercad
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