Misaki 5b4832a886 Refactor SIMD gather, tighten constraints, doc & test opts ...

- Require TLane : unmanaged, ISPMDLane for stricter type safety and direct memory ops
- Refactor GatherVectorN and WideLane<T>.Gather to use Unsafe.SkipInit and direct assignment, removing stackalloc and TLane.Load for better SIMD performance
- Use Vector.Sum in WideLane<T>.ReduceAdd
- Add/improve XML docs for ReduceAdd/ReduceMax/ReduceMin
- Update test project for AOT, AVX2, speed optimization, and disable reflection
- Tweak GGXMipGenerationBenchmark and Program.cs for improved benchmarking and output

2026-04-30 16:02:18 +09:00

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