Test xClaw on Marvin

Allows for long running tasks and cron tasks, though need some concrete use cases.

Nanobot seems like most appropriate starting point.

https://medium.com/@gemQueenx/nanobot-vs-nanoclaw-vs-ironclaw-vs-zeroclaw-vs-picoclaw-vs-tinyclaw-which-openclaw-mini-wins-for-9a0537220f3b