Add reference contracts to extractor metadata

internal/modules/extract/dnd/spells/extractor.go

@@ -45,6 +45,10 @@ func (e *Extractor) SchemaVersion() string {
 	return SchemaVersion
 }
 
+func (e *Extractor) ReferenceSlots() []contracts.ReferenceSlot {
+	return nil
+}
+
 func (e *Extractor) ManifestMetadata() map[string]any {
 	promptMetadata := spellsPromptBundle.Metadata()
 	metadata := map[string]any{

internal/modules/extract/dnd/spells/registry_test.go

@@ -82,6 +82,15 @@ func TestRegisterStoresModuleSpec(t *testing.T) {
 	}
 }
 
+func TestRuntimeReferenceSlotsMatchModuleSpec(t *testing.T) {
+	extractor := New()
+	spec := ModuleSpec()
+
+	if !reflect.DeepEqual(extractor.ReferenceSlots(), spec.ReferenceSlots) {
+		t.Fatalf("ReferenceSlots() = %#v, want spec slots %#v", extractor.ReferenceSlots(), spec.ReferenceSlots)
+	}
+}
+
 func TestRegisterNilRegistryReturnsError(t *testing.T) {
 	err := Register(nil)
 	if err == nil {