Add WebGPU N-Body Galaxy demo#79
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Adds a real-time gravitational N-body galaxy to the Demos section. Every body attracts every other one, a brute-force O(N²) sum recomputed each frame in a WebGPU compute shader (tiled into shared memory, symplectic integration so the disk holds its shape). No server, no precompute.
Runs in Chrome/Edge, Safari 18+, and recent Firefox.
Live: https://dakerboul.github.io/nbody-webgpu/
Source: https://github.com/DaKerboul/nbody-webgpu