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Brings in ffmpeg (probing, extractAudio) and the video operations. The transcribe registration now gets the ffmpeg audio tools, so video is transcribed through extractAudio with the demuxer forced from the MIME type, and long recordings are converted and uploaded in ranges. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u