Expand module contracts for references and normalizer LLM access

internal/modules/normalize/noop/normalizer.go

@@ -25,6 +25,10 @@ func (n *Normalizer) Key() string {
 	return Key
 }
 
+func (n *Normalizer) ReferenceSlots() []contracts.ReferenceSlot {
+	return nil
+}
+
 func (n *Normalizer) Normalize(ctx context.Context, req contracts.NormalizeRequest) (contracts.NormalizeResult, error) {
 	if n == nil {
 		return contracts.NormalizeResult{}, normalizerErrorf("normalizer must not be nil")

internal/modules/normalize/noop/normalizer_test.go

@@ -34,6 +34,13 @@ func TestModuleSpecAndRegister(t *testing.T) {
 	if !reflect.DeepEqual(spec, want) {
 		t.Fatalf("registered spec = %#v, want %#v", spec, want)
 	}
+	normalizer, err := registry.Build(Key)
+	if err != nil {
+		t.Fatalf("Build(%q) error = %v, want nil", Key, err)
+	}
+	if slots := normalizer.ReferenceSlots(); len(slots) != 0 {
+		t.Fatalf("ReferenceSlots() = %#v, want none", slots)
+	}
 }
 
 func TestNormalizePassesThroughOrderAndValues(t *testing.T) {