Save Handoff

This lets you create a checkpoint summary of your Cursor session that you can resume later, but only when you explicitly ask for it. Under the hood it tries to use `nmem` to save a structured handoff with your goals, decisions, modified files, and next steps. The author is refreshingly honest here: Cursor doesn't have real thread import yet, so this isn't saving your actual transcript. It's more like leaving yourself a good sticky note about where you left off. If `nmem` isn't installed, it just tells you that instead of faking it. Useful if you context switch a lot and want breadcrumbs back to your work.