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Field lesson from translating a real Motion timeline: the two returned encodings window durations differently, and keyframes at times ~0.9999 are loop-wrap resets, not authored motion. Hand-normalizing across encodings and inventing visible returns produced a render that diverged from Figma. The skill now mandates verbatim single-encoding translation, wrap-via-repeat, and a frame-grid comparison against export_video ground truth before completion. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>