fix(unpack): use atomic renames to flatten nested output and make unpacking more reliable

ts/mod_fs/classes.fshelpers.ts

@@ -130,11 +130,9 @@ export class FsHelpers {
 
   /**
    * Move/rename a file or directory
-   * Uses renameSync for reliability on XFS/mounted filesystems where async
-   * rename can be interrupted by signals from process managers
    */
   public static async move(src: string, dest: string): Promise<void> {
-    fs.renameSync(src, dest);
+    await fs.promises.rename(src, dest);
   }
 
   /**