fix: remove dead code, fix JSON parsing, add facts validation

nanobot/agent/memory_mem0.py

@@ -58,13 +58,9 @@ class Mem0MemoryStore:
             if key in raw_config:
                 mem0_cfg_dict[key] = raw_config[key]
         logger.debug(f"Extracted for MemoryConfig: {list(mem0_cfg_dict.keys())}")
-        logger.debug(f"Custom prompt length: {len(custom_prompt)} chars")
-        mem0_cfg_dict["custom_fact_extraction_prompt"] = custom_prompt
         mem0_config = MemoryConfig(**mem0_cfg_dict)
         logger.debug(f"MemoryConfig created: vector_store={mem0_config.vector_store.provider if mem0_config.vector_store else None}")
-        logger.debug(f"MemoryConfig.custom_fact_extraction_prompt is None: {mem0_config.custom_fact_extraction_prompt is None}")
         self.memory = Memory(config=mem0_config)
-        logger.debug(f"Memory.config.custom_fact_extraction_prompt is None: {self.memory.config.custom_fact_extraction_prompt is None}")
 
         logger.info("Mem0 memory system initialized with custom nanobot prompt")
 
@@ -187,8 +183,12 @@ class Mem0MemoryStore:
                 text = text.split("```")[1]
                 if text.startswith("json"):
                     text = text[4:]
+                text = text.strip()
             data = _json.loads(text)
             facts = data.get("facts", [])
+            if not isinstance(facts, list):
+                logger.warning(f"LLM returned non-list facts: {type(facts)}")
+                return []
             logger.debug(f"Extracted {len(facts)} facts using {model}")
             return facts
         except Exception as e: