Record M01-M15 at 1280x720 H.264/AAC (187s each), fix the UV and Spreadsheet recording actions, embed each module video with poster and VTT in the generated course, and record the verified 15/15 checker result. M01 is re-recorded; M06/M13 were retried after action fixes. Co-Authored-By: Claude Code <noreply@anthropic.com>