docs: the history phrases the id sweep missed, restated as present-tense facts or traps (#6277)

A wider pass for "previous", "before the fix", "we shipped" and the
like. The chi double-subtree, uppercase Vorbis key and stopPropagation
comments now describe the trap they guard; commit hashes, CI run
numbers and a deleted file name are gone; uuidString's comment says
what it returns.

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

internal/coverart/enricher.go

@@ -362,7 +362,7 @@ func (e *Enricher) RetryAlbum(ctx context.Context, albumID pgtype.UUID) error {
 	return e.EnrichAlbum(ctx, albumID)
 }
 
-// uuidString carries over from the previous enricher.
+// uuidString renders a UUID as text for logs, or "<nil>" when it is not set.
 func uuidString(u pgtype.UUID) string {
 	if !u.Valid {
 		return "<nil>"