Feature request: customizable CLI mascot/theme

Feature Request

What: Allow users to customize the pixel art mascot shown in the CLI header.

Why: The current mascot is hardcoded. It would be great to let users swap it out with their own ASCII/pixel art — make the tool feel personal.

Suggested implementation:

• A mascot key in settings.json pointing to a text file with custom ASCII art, or false to disable it entirely
• Optionally, a spinnerVerbs equivalent for the greeting/completion messages so users can theme the whole experience
• No need to ship alternatives — just make the current one replaceable by the user

Use case: Personalization. Let users make the CLI feel like theirs.

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Submitted on behalf of Hugo Sant'Anna (hsantanna@me.com)