Looks pretty nice. I think a lot of devs have been making similar tools, I've written my own thing that does a work review loop. I like the interface you've made. I'll probably give it a go, but I'm also reluctant to relinquish the control I have when it's my own code doing orchestration.
Oh ya, lots of tools out there orchestrating these days, and just writing a script is a valid option. On the control bit, note that if you `cook init` in your project, it generates a COOK.md that lets you template the meta prompt. Claude could probably take a look at how you've been doing it and port it over to COOK.md so it's similar to the prompts you've been using.