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Per plan Task 7. Every frame now a keyframe (verified 93/93 I-frames on a sample), so the scrub interaction seeks to arbitrary frames smoothly. Total transitions 173M -> 504M; largest clip ~5.8M (well under the 25MB LFS/proxy ceiling). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>