The strict cascade steps required the YouTube channel name to contain the artist, so
official uploads on label channels (BANGTANTV, HYBE LABELS, …) were rejected and the
no-channel fallback grabbed a fan reupload instead (observed: BTS "Pied Piper").
Add yt-dlp's music `artist` field as an OR alternative to the channel check in the
strict steps (two --match-filter args = OR). A metadata dump of "BTS Pied Piper"
confirmed only the official upload has artist=BTS (fan/live/lyric reuploads: NA), and
it's the #1 result — so it now passes strict step 2. channel_is_verified was rejected
as a signal: lyric videos and fan MVs also run on verified channels.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>