[API] Support np.where via ILKernelGenerator#606

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Nucs wants to merge 3 commits intomasterfrom

Commits on Apr 12, 2026

feat(where): Add IL-generated SIMD optimization for np.where(condition, x, y)
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perf(where): AVX2/SSE4.1 optimize mask expansion in np.where kernel
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perf(where): inline mask creation in IL - 5.4x faster kernel
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