Amusingly this is an almost-exact description of how I work on my current project, sharc. I'm porting Arc to Common Lisp, and implementing as many HN features as I can. I've been documenting as I go with handoffs: https://github.com/shawwn/sharc/tree/main/docs/agents/handof... (Also thanks partly to dang, who is kind enough to find time to answer an email here and there about their current Arc stack.)

At one point I was working so hard that Claude actually suggested, all on its own, that I should get some sleep.