ansi color

Help text could use ansi colors if the output stream is a tty? `clap` suports this, for example. Let me know if you are interested and I'l put together a PR.

<img width="654" height="561" alt="Image" src="https://github.com/user-attachments/assets/09dda7ff-0fe0-49ab-9bb1-f58dbe8340ff" />