Both tools: yt-dlp calls via spawn (honor DRY_RUN; --dry-run prints the
command and skips dep checks), -o/--output, --no-playlist, --cookies (with
file check), clean ffmpeg/yt-dlp guards, POS_FLAGS for completion, full
embedded metadata (--embed-metadata --embed-chapters --embed-thumbnail
--no-overwrites; mp3 adds --convert-thumbnails jpg + artist-from-uploader
parse-metadata). mp3 gains --by-artist (~/Music/<artist>/<title>.mp3).
mp4: -f <id>/--best/--worst skip the prompt (mutual-exclusion validated),
and the interactive picker now shows a curated [audio]/[video]/[combo]
format table on stderr (stdout carries only the chosen id — ui_pick
lesson), validates the id against the real -F output, and defaults empty
input to best. Docs: howto/media.md rewritten.
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