Breaking changes:

- Replace the `causa` Node executable with `cs`, which exposes the bootstrap mechanism (see features).

Features:

- Refactor and expose `runCli` such that it can be used it tests. It no longer manipulates the process's exit code and accepts user-provided arguments instead of getting them from `process.argv`.
- Implement the bootstrap logic, looking for the workspace in which the CLI should be run, and initializing it (with its dependencies) if necessary.