Both repos used SigLevel = Optional TrustAll, so unsigned or tampered packages went straight into the ISO. Inherit Required DatabaseOptional from [options] and have build-iso import + lsign both signing keys. Also in build-iso: detach only loop devices backed by the work dir (losetup -D hit every loop on the runner host) and drop the ?token= download fallback that put the API token into access logs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>