Guard MASK_SIEGE and regular mob MASK_PET scans were dead code: no mob ever carries either mask. Removed so they cannot start auto-aggroing siege engines if the masks are wired up later. Safehold guards no longer aggro siege engines. Guards still respond to a siege engine damaging a city building. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>