[WIP] GPU support through KernelAbstractions#51

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lkdvos wants to merge 17 commits intomainfrom

Commits on Mar 15, 2026

Add GPU mapreduce support via KernelAbstractions kernel

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Add GPU mapreduce tests using JLArrays

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Fix GPU mapreduce: scalar indexing, output type, test expectations

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Use GPUArrays.neutral_element for _mapreduce init value

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Extend GPU mapreduce tests with nontrivial strides and offsets

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Restrict GPU _mapreduce_fuse! dispatch to all-GPU input arrays

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Introduce GPUStridedView type alias to reduce verbosity

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