Use when a terminal UI's rendering is the subject: a TUI, curses, Textual, Rich, Ink or bare-ANSI screen that must be proven to draw — "wrong in a narrow terminal", "the footer wraps", "columns stop lining up at 80", "it redraws garbage", "the box characters are mojibake", "ΓöÇ" — or there is no pty to drive it: no tmux, stdin closed, winpty ASSERT_CONDITION. NOT for a web or native GUI — that is `a11y-toph` and `design-arwen`.
