Verify Motion

1#!/usr/bin/env node
2/**
3 * Objective fidelity gate for figma-motion imports (skill step 2b).
4 *
5 * Compares the HyperFrames render against Figma's own `export_video` output
6 * using MOTION-ENERGY deltas: for each sample window [t, t+interval], the
7 * frame difference ref(t+i)-ref(t) is compared (PSNR) against
8 * render(t+i)-render(t). Static import divergence (fonts, rasterized edges,
9 * subpixel geometry — the hybrid-fidelity ceiling) cancels out of both
10 * deltas, so the score isolates choreography: trajectories, timing, easing.
11 *
12 * Calibration (SDS "Unlocked" card, 2026-07): a faithful translation scored
13 * min 20.3dB / mean 27.7dB; a diverging one (invented retract keyframes,
14 * wrong durations) scored min 5.0dB / mean 23.1dB. Default threshold 15dB