Fork with checkpoint-to-file extension

Hi Matt — I forked your grill-me skill and extended it to checkpoint every answer to a capture file on disk as the interview happens, rather than holding the session in context. Useful for longer brainstorms where context fills up before the interview's done. Fork: https://github.com/eshaanjain26/grill-me Credited and MIT-licensed per your original. Wanted to flag it in case it's useful to you or worth linking from your repo. No action needed on your end. — Eshaan