[MLAS][KleidiAI] Add MLAS Arm64 half GEMM and convolution support#28786

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Laan33 wants to merge 10 commits into

microsoft:mainfrom

Laan33:fp16-split/02-mlas-half-api-squashed

Commits on Jul 13, 2026

Fix KleidiAI conv LHS pointer cache lookup

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Adjust fp16 MatMulNBits tolerance

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Exclude EPs without fp16 Resize coverage

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Loosen NHWC fp16 fused-conv tolerance

Laan33
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Constrain NHWC fp16 pool tests to owning EPs

Laan33
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JonathanC-ARM
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Add MLAS Arm64 half API support

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Validate HalfGemm packed-B edge cases

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Initialize HalfConv layout flags

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Address review comments
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Address review feedback
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