Pure helpers for handing a session to an external terminal: the
`--tui --resume <id>` argv, a launcher script that carries the resolved
runtime's command and PYTHONPATH, and per-platform emulator resolution.
macOS opens the .command with no -a so LaunchServices routes it to whichever
app the user bound to shell scripts; Linux leads with Debian's
x-terminal-emulator alternative before the concrete emulators; Windows prefers
Windows Terminal over a cmd console.
Brooklyn Nicholson