best-in-class for Plex/Jellyfin, matching ytdl-sub: each youtube episode now gets a
'<name>-thumb.jpg' (episode art) + a '<name>.nfo' (<episodedetails>: title, plot from
the video description, aired date, season=year, episode=MMDD, channel, youtube uniqueid).
- yt-dlp now writes the thumbnail + an info.json next to the staged video; the import
step renames the thumb, mines the json for the nfo, and cleans both up (so nothing
litters the download folder when a toggle is off).
- gated by the SAME post-processing toggles as movie/TV (save_artwork / write_nfo),
which already exist in Settings → Library; youtube just honours them now.
- flipped save_artwork + write_nfo defaults ON (cheap, local). download_subtitles stays
opt-in (it hits OpenSubtitles — external + rate-limited).
build_episode_nfo + the gated sidecar I/O tested.