- Use pacman -Syu instead of -Sy to prevent partial upgrades (Arch footgun)
- Run manual AUR build in subshell to avoid leaving cwd in temp dir
- Use append_if_missing for flatpak.conf instead of overwriting
- Show warning on test Flatpak install failure instead of silent suppression
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>