feat: the duplicate resolver fetches a missing album track list from MusicBrainz to decide a wrong slot, five albums a pass (M498)

20 of the 34 groups left for review had no cached track list for their album:
the catalogue only reads one when the wanted list or the importer needs it.
The resolver now asks catalogue.RefreshReleaseGroup for an album it must
decide and the catalogue has never read, through the shared MusicBrainz pacer,
at most five a pass (hourly). An unreachable MusicBrainz stops the pass's
fetching; a group read and found empty is not asked about again.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/minstrel/main.go

@@ -363,10 +363,11 @@ func run() error {
 
 	// Duplicate resolver (M498, M502): classifies the sweep's groups and, with
 	// the operator's auto-resolve on, merges the copies that are safe to merge.
-	// Started after SetNotifier so its summaries reach admins. See
-	// internal/library/duplicate_resolve.go.
+	// Started after SetNotifier so its summaries reach admins. It asks the
+	// catalogue for the track list of an album whose wrong slot it must
+	// decide, a few a pass. See internal/library/duplicate_resolve.go.
 	go library.NewDuplicateResolveWorker(pool, logger.With("component", "duplicate_resolve"),
-		cfg.Storage.DataDir, fpSettings).Run(ctx)
+		cfg.Storage.DataDir, fpSettings, cat.RefreshReleaseGroup).Run(ctx)
 
 	// Missing-file re-acquisition (milestone #290, M502 #5520). Wants back
 	// albums whose files have been gone longer than the grace window; the