Commit full-length compressed exports of both demucs stems

vocals.mp3 (narrator only) and no_vocals.mp3 (background/instrumental
only), 128kbps MP3, so both are viewable/playable directly in Gitea
without needing local playback or GPU-box access.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Y1oQ4h4WE4R9KRvMQLr5Ey

.gitignore

@@ -29,3 +29,7 @@ outputs/
 # Full-size source video — keep locally, commit only compressed derivatives
 media-files/video/*.mp4
 !media-files/video/*-480p.mp4
+
+# Compressed exports of demucs stems — keep committed for review without
+# local playback (the raw separated/*.wav stems stay local, per *.wav above)
+!demucs/*.mp3