#19194's fix added process.exit(0) to die()/dieWithCode() with a comment
relying on a process.on('exit') handler in entry.tsx that resets terminal
modes — but that handler was never installed. So /quit, Ctrl+C, Ctrl+D and
every process.exit() path left DEC mouse tracking (?1000/1002/1003/1006)
armed in the parent shell. The terminal then kept emitting mouse reports
into stdin — read as keystrokes by the shell or a freshly relaunched TUI —
surfacing as ...;...M garbage in the input box.
Install the missing handler. 'exit' fires once on real termination and runs
synchronous code only; resetTerminalModes() writes via writeSync, so the
disable sequence lands before the process is gone.
Fixes#28419
fd1e7c2bc3