Expand module contracts for references and normalizer LLM access

internal/modules/chunk/dnd/scenes/chunker.go

@@ -34,6 +34,10 @@ func (c *Chunker) Key() string {
 	return Key
 }
 
+func (c *Chunker) ReferenceSlots() []contracts.ReferenceSlot {
+	return nil
+}
+
 func (c *Chunker) ManifestMetadata() map[string]any {
 	promptMetadata := scenesPromptBundle.Metadata()
 	metadata := map[string]any{