verify-pixels

From README

Prove pixels unchanged Choose the gate Byte-exact: the change keeps the same decoded data and the same shading math, so every pixel must match. Side-by-side review: the change alters sampled values, random order, precision, or where math runs. Report it as "not byte-gateable" and show old and new at each pose; do not invent thresholds. Make frames deterministic Load every asset and match camera, canvas size, lighting, and animation time between builds. Seed incidental randomness. Drive animated shaders from one app-owned time value, not Date.now() or performance.now(). app.timeScale = 0 makes dt zero, but update still runs; anything counting frames or reading wall-clock time still advances. Set app.autoRender = false, then app.renderNextFrame = true before each frame to capture. Capture and compare WebGL: await (device as WebglGraphicsDevice).readPixelsAsync(x, y, w, h, pixels). WebGPU: render into a RenderTarget and read its colorBuffer with Texture#read().