Add O4 by simoz

Adds O4 by simoz, a Suno-generated song about Omarchy Quattro and developing with four AI agents.

Includes the original MP3, playlist entry, and plain-text lyrics from the embedded metadata. The track is 2:52 and 3.77 MB, with no explicit lyrics.

Validation: npm run build, npm test (1,115 checks passed), and full MP3 decoding with FFmpeg.