feat: surface disputed extracted values to critic and specialist prompts

backend/agents/disputes.py

@@ -12,7 +12,7 @@ from typing import Dict, List
 
 
 def _norm(value) -> str:
-    return re.sub(r"\s+", " ", str(value or "").strip().lower())
+    return re.sub(r"\s+", " ", ("" if value is None else str(value)).strip().lower())
 
 
 def find_disputes(assertions: List[Dict]) -> List[Dict]: