Legacy: instantARCH (bash)

instantARCH is the older bash-based installer built around instantmenu. It is still what the instantos.io/install script runs and what older instantOS ISOs ship with.

• Run from an Arch live ISO with bash <(curl -L instantos.io/install)
• Debug mode: set INSTALLDEBUG=1 or create /tmp/installdebug
• Optional log tag: put an identifier in /tmp/debugname

For deeper development notes, see instantARCH development docs.