Register D&D scene description pipeline

internal/modules/dnd/register/merge.go

@@ -78,6 +78,25 @@ func appendNPCInteractionLists(values []dnd.NPCInteractionList) (dnd.NPCInteract
 	return combined, nil
 }
 
+func appendSceneDescriptionLists(values []dnd.SceneDescriptionList) (dnd.SceneDescriptionList, error) {
+	count := 0
+	present := false
+	for _, value := range values {
+		if value.Scenes != nil {
+			present = true
+		}
+		count += len(value.Scenes)
+	}
+	if !present {
+		return dnd.SceneDescriptionList{}, nil
+	}
+	combined := dnd.SceneDescriptionList{Scenes: make([]dnd.SceneDescription, 0, count)}
+	for _, value := range values {
+		combined.Scenes = append(combined.Scenes, value.Scenes...)
+	}
+	return combined, nil
+}
+
 func cloneCombatTurn(value dnd.CombatTurn) dnd.CombatTurn {
 	clone := value
 	if value.SourceRefs != nil {