Add anaconda-summary-hub.glade file, a customized copy of anaconda 45.8's summary.glade without the "We won't touch your disks…" disclaimer label at the bottom of the hub.
This file is placed in a neutral path (usr/local/share/fws/) because mkarchiso applies the airootfs before pacstrap. Placing it at the anaconda package path would cause pacman to refuse installation due to filesystem conflicts. The live environment's .xinitrc copies this file to /usr/share/anaconda/ui/hubs/summary.glade during boot.