README: discovery status → done (ListenBrainz-native, no Spotify); off-by-default
note for the discovery sweep; architecture mentions MusicBrainz+ListenBrainz.
Plan: check off final verification (suites green, whole-branch review passed,
live-API algorithm fix), append the review's deferred items to Notes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>