Skin
Domain: Configuration
Motivation
Visual theme for the TUI. Controls colors, borders, and layout. Configured in display section.
Concrete Example
display.skin: default. Or: minimal, dark, retro. Each skin changes how the TUI looks. Colors, borders, status bar style - all controlled by skin.
Analogy
A phone case - you pick a color and style. The phone works the same, but looks different. Skins change how Hermes looks, not how it works.