Use the extra-iterable npm package already available in /app to compute set differences and write the…

Use the extra-iterable npm package already available in /app to compute set differences and write the…: a task in rts-1k-rootless-apptainer: RTS-1K: offline rootless Apptainer release (Harbor dataset). What the agent is asked, how it is graded, what it runs in, and its files.