[Vulkan] Keep reductions the reduce shaders cannot handle on CPU - #23245

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mergennachin wants to merge 6 commits into

gh/mergennachin/28/headfrom

gh/mergennachin/29/head

Commits on Sep 29, 2026

[INITIAL] Recreate the Vulkan transformer and conformance stack with ghstack
mergennachin
committed
2131a32

Commits on Oct 3, 2026

[UPDATE] Rebase remaining Vulkan stack onto main after parts 1–3 landed
mergennachin
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e1b9cb7
[UPDATE] Cover exact FP16 halfway rounding in texture reductions
mergennachin
committed
5b423ab
[UPDATE] Match arg-reduction partitioning to the buffer-only last-dimension kernel; rebase after PR 23243 landed
mergennachin
committed
cf96624
[UPDATE] Add exact FP16 zero/subnormal and overflow-threshold coverage
mergennachin
committed
213b59f
[UPDATE] Exercise int32 reduction shaders directly beyond the removed clamp
mergennachin
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59e4479