docs(discovery/crawler): clarify unused year param in parseDateAttr

backend/internal/domain/discovery/crawler/festival_alarm.go

@@ -120,10 +120,13 @@ func parseFestivalAlarm(data []byte, sourceURL string, year int) ([]RawEvent, er
 	return events, nil
 }
 
-// parseDateAttr reads the content="YYYY-MM-DD" attribute from a span and
-// returns a *time.Time in UTC. Falls back to year for the year component if
-// the attribute is absent or malformed (shouldn't happen in practice).
+// parseDateAttr reads the content="YYYY-MM-DD" attribute from an itemprop
+// span and returns a *time.Time in UTC. Returns nil if absent or malformed.
+// The year parameter is accepted for signature symmetry with future sources
+// that may not include full dates in their markup; it is intentionally unused
+// here because festival-alarm always emits complete ISO dates.
 func parseDateAttr(s *goquery.Selection, year int) *time.Time {
+	_ = year
 	content, exists := s.Attr("content")
 	if !exists || content == "" {
 		return nil
@@ -132,7 +135,5 @@ func parseDateAttr(s *goquery.Selection, year int) *time.Time {
 	if err != nil {
 		return nil
 	}
-	// The site always includes the correct year in the attribute; just validate.
-	_ = year
 	return &t
 }