Simplify image download explanation

README.md

@@ -52,4 +52,4 @@ snapshot_download(
 )
 ```
 
-This downloads the retained tasks and their available cached Apptainer images to `data/`. The `.sif` images are already compressed and can be reused for validation or RL; task-specific setup still runs separately.
+This also downloads the cached build images for the tasks.