Cloud Tech Boost: WebAssembly SIMD Cracks 16-Pixel Grayscale Challenge

I finally understood WASM SIMD by writing a real kernel: RGB → grayscale luma, 16 pixels per instruction instead of one at a time. Same math, ~4× faster on a single core. This is the condensed version — the full write-up has every op desugared into plain TypeScript, lane-by-lane ASCII diagrams, and