cli: reset cache command

## Summary

The Quartz CLI should include a command which resets the cache for a given project.

`quartz clean`

Is `clean` good? Would it be confused with `cargo clean`? (we already include a `cargo` replacement for `build` and arguably `run`)

## Acceptance Criteria

Start by locating the Quartz CLI command entry point and the existing cache handling, then compare the proposed `clean` name with the current `build` and `run` command replacements. Done means an agreed command resets the cache for a specified project and its name and behavior are documented by tests or acceptance criteria.

Written by the indexing model from the issue text.