docs(plan): add M5b quarantine workflow implementation plan
16 tasks covering migration 0011, Lidarr client extensions (LookupArtistByMBID, LookupAlbumByMBID, DeleteAlbum), library.DeleteTrackFile, lidarrquarantine.Service (Flag/Unflag/ListMine/ListAdminQueue + Resolve/DeleteFile/DeleteViaLidarr), soft-hide enforcement on user-context track-list reads, /api/quarantine + admin endpoints, and frontend (TrackMenu/FlagPopover, /library/hidden, /admin/quarantine, sidebar promotion). Mirrors the M5a plan cadence.
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