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kernel-fusion demonstrator

this route is the pure-WebGPU path. real-time 3DGS via fused compute dispatches lands here when one of the candidates below ships an ESM bundle that loads via importmap (no build step). for now: a single fused compute dispatch renders sky + ground + cars in one pass and writes straight to the swap-chain. zero three.js, zero postprocessing addons, zero npm.

waiting on Visionary — WebGPU 3DGS engine, Apr 2026, requires Vite build, no CDN/ESM bundle yet
waiting on Spark WebGPU backend — v2.0 (Apr 14 2026) is still WebGL2
fallbacks Scthe / Marcus are .splat-only, not libraries; would need clone+build

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