Improve debug: When -v is used, also increases the verbosity of the command running in the subprocess

### Description:

Improve debug: When `-v` is used, also increases the verbosity of the command running in the subprocess.

If a problem occurs in git, debugging the error can be hard.
Maybe to keep the compatibility should good to only increase the verbosity of the subprocess if `-vv` is used

Start by tracing how the CLI handles -v and how it launches subprocess commands, then inspect the existing verbosity behavior. Confirm the intended compatibility difference between -v and -vv, and verify that the selected flag produces the expected subprocess verbosity without changing normal command behavior.

Written by the indexing model from the issue text.