fix: Restore proper logging in _find_relevant_policies() exception handler

- Fix bug where exceptions were swallowed without logging in context_retriever.py
- Restore warning log for policy search failures with sanitized category
- Ensure compliance with PR Compliance ID 3 for robust error handling
- Prevent silent failures that hinder debugging and mask missing policy coverage

semantica/context/context_retriever.py

@@ -2134,6 +2134,7 @@ Answer:"""
             except Exception as e:
                 # Sanitize category for logging (remove sensitive data)
                 safe_category = category[:20] if category else "unknown"
+                self.logger.warning(f"Failed to find policies for {safe_category}: {type(e).__name__}")
                 return policies
 
     # Decision Retrieval Methods