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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>