feat(trace): allow saving trajectory as trace (#426)

config.d.ts

@@ -94,6 +94,11 @@ export type Config = {
    */
   vision?: boolean;
 
+  /**
+   * Whether to save the Playwright trace of the session into the output directory.
+   */
+  saveTrace?: boolean;
+
   /**
    * The directory to save output files.
    */