ui-clock-freezes-at-settle.md left the sweep period ❔ because a validated estimator disagreed between two dwells (515 vs 452 frames). The cause is now measured: captured frame counts are not comparable across runs at all -- 1.947x between two captures of the same animation, with the baseline moving 1.953x alongside. As a ratio the period reproduces to 0.35%. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t