[wasm] Enable Vector128 fast paths on Wasm via PackedSimd: hex/Guid, UTF-8, SearchValues, Teddy, Adler32/XXH3#129838

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lewing:wasm-vector128-fastpaths

Commits on Jun 25, 2026

Add Wasm PackedSimd path to Vector128.UnpackLow/UnpackHigh

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Enable Vector128 hex/Guid format fast path on Wasm

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Vectorize Utf8Utility.Validation ASCII fast path on Wasm

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Vectorize Utf8Utility.Transcoding ASCII fast path on Wasm

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Enable Teddy multi-string search on Wasm

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Enable ProbabilisticMap vectorized SearchValues<char> on Wasm

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Use PackedSimd horizontal ops in Adler32 and XXH3 on Wasm

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Replace PackedSimd.Shuffle with ShuffleNative+OR in Vector128.UnpackLow/UnpackHigh

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Call PackedSimd.Swizzle directly in Vector128.Unpack and TeddyHelper.RightShift

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Update Utf8Utility.Validation comment for Wasm

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Drop redundant '&& BitConverter.IsLittleEndian' from PackedSimd gate

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