fix conversation dir creation permissions

multi_agent_chatbot.py

@@ -139,9 +139,19 @@ class MultiAgentRAGChatbot:
         # Build the multi-agent graph
         self.graph = self._build_graph()
         
-        # Conversations directory
-        self.conversations_dir = Path("conversations")
-        self.conversations_dir.mkdir(exist_ok=True)
+        # Conversations directory - use absolute path in /app to ensure writability
+        self.conversations_dir = Path("/app/conversations")
+        try:
+            self.conversations_dir.mkdir(mode=0o755, exist_ok=True)
+        except (PermissionError, OSError) as e:
+            logger.warning(f"Could not create conversations directory at {self.conversations_dir}: {e}")
+            # Fallback to a relative path (current directory)
+            self.conversations_dir = Path("conversations")
+            try:
+                self.conversations_dir.mkdir(mode=0o755, exist_ok=True)
+            except (PermissionError, OSError) as e2:
+                logger.error(f"Could not create conversations directory at {self.conversations_dir}: {e2}")
+                raise RuntimeError(f"Failed to create conversations directory: {e2}")
         
         logger.info("🤖 Multi-Agent RAG Chatbot initialized")