fix: Hybrid model - node-specific question spectrums override catalog (Phase 1 requirement)

backend/workflow_executor.py

@@ -250,9 +250,20 @@ async def execute_node(
             # 6. Normalize Signals
             normalized_signals = []
             if parsed["decision_signals"]:
+                # Hybrid Model: Node-spezifische Questions überschreiben Catalog
+                node_catalog = catalog.copy()
+                if node.question_augmentations:
+                    for q in node.question_augmentations:
+                        q_dict = q.model_dump() if hasattr(q, 'model_dump') else q
+                        node_catalog[q_dict['type']] = {
+                            "answer_spectrum": q_dict['answer_spectrum'],
+                            "normalization_rules": None  # Node-Questions haben keine Synonyme
+                        }
+                        logger.debug(f"Node {node.id}: Override catalog for '{q_dict['type']}' with node-specific spectrum")
+
                 normalized_signals = normalize_all_signals(
                     decision_signals=parsed["decision_signals"],
-                    catalog_dict=catalog
+                    catalog_dict=node_catalog
                 )
                 logger.info(f"Node {node.id}: Normalized {len(normalized_signals)} signals")