Ink's exit() calls unmount() which resets terminal modes (kitty keyboard,
mouse, etc.) but does NOT call process.exit(). The Node process stays
alive because stdin is still open (Ink listens on it), so the
process.on('exit') handler in entry.tsx — which sends the final
resetTerminalModes() — never fires.
This left kitty keyboard protocol and other terminal modes enabled in the
parent shell after /quit, Ctrl+C, or Ctrl+D, breaking arrow keys and
other input in subsequent programs.
Add explicit process.exit(0) after exit() in die() so the process
actually terminates and the exit handler runs.
Fixes#19194
9c93fc5775