We think alike!

https://github.com/kzahel/claw-starter

Systemd basic script + markdown + (bring whatever agent CLI)

That's I think basically what you describe. I've been using it for the past two days it's very very basic but it's a I think it gives you everything you actually need sort of the minimal open claw without a custom harness and 5k loc or 50k or w/e. The cool thing is that it can just grow naturally and you can audit as it grows