Expand module contracts for references and normalizer LLM access

internal/framework/pipeline/chunker_registry_test.go

@@ -330,6 +330,10 @@ func (chunker registryChunker) Key() string {
 	return chunker.key
 }
 
+func (chunker registryChunker) ReferenceSlots() []contracts.ReferenceSlot {
+	return nil
+}
+
 func (chunker registryChunker) Chunk(ctx context.Context, req contracts.ChunkRequest) (contracts.ChunkResult, error) {
 	return contracts.ChunkResult{}, nil
 }
@@ -354,6 +358,10 @@ func (normalizer registryNormalizer) Key() string {
 	return normalizer.key
 }
 
+func (normalizer registryNormalizer) ReferenceSlots() []contracts.ReferenceSlot {
+	return nil
+}
+
 func (normalizer registryNormalizer) Normalize(ctx context.Context, req contracts.NormalizeRequest) (contracts.NormalizeResult, error) {
 	return contracts.NormalizeResult{}, nil
 }