feature: add `kit reset`

[nick1udwig]

Is your feature request related to a problem? Please describe.
kit stores a variety of files in a cache in /tmp/kinode-kit-cache. Rarely, the cache can get messed up.

Describe the solution you'd like
Would be nice to have a kit reset or kit clear-cache or something to rm -rf /tmp/kinode-kit-cache.

Would also be nice to print to consider using it in certain error cases.

Describe alternatives you've considered
In principle the cache should be un-mess-up-able. In practice, its p hard to eliminate all possible edge cases.