Fix Codex transcript convergence

server/src/session/llama.rs

@@ -497,6 +497,9 @@ fn conversation(path: &Path) -> Vec<Message> {
                 });
             }
             Event::AssistantText { delta } => pending.push_str(&delta),
+            Event::AssistantTextFinal { text } => {
+                pending = text;
+            }
             _ => {}
         }
     }