- choose_macos_shell answers zsh on Enter, on no terminal and on an
unknown value; MACOS_SHELL=bash still picks bash.
- remote-install.sh hands /dev/tty to install.sh when one can be opened:
piped into bash, stdin was the script, so install.sh saw no terminal
and silently skipped the identity, shell and offer questions.
- remote-install.sh cloned master by default; origin only has main
(the documented raw URL 404s on master, 200 on main). README updated.
