configure_me: subcommands

Implement subcommands in [`configure_me`](https://github.com/Kixunil/configure_me)

Start by reading the configure_me entry point and its current command-line behavior. The issue does not identify files, tests, or the intended subcommands, so first determine the expected command structure and acceptance criteria from the project context. Done means the requested subcommands are implemented and their behavior is covered by the project's available checks.

Written by the indexing model from the issue text.