Adds a post-keymap action selection to launch.sh (Install vs Reset).
The reset routine (reset-arch.sh) unlocks LUKS via FIDO2 token and/or
passphrase, snapshots /etc credentials and config, wipes and recreates
the @ btrfs subvolume, reinstalls base packages via pacstrap, restores
auth files (passwd/shadow/pam.d/sudoers) and system config, then
regenerates the initramfs and GRUB menu from chroot. User home data is
preserved; ~/.config is cleared except Yubico/ auth keys so FIDO2 PAM
login continues to work. libfido2 added to packages.extra for live-env
token unlock support.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
