Operator decision: Aetheria moves onto CultMath as the best workout GameCult's
math library can get, with gaps filled in CultMath itself. The map no longer
rejects the switch, and Cut 6's Studio drawers target CultMath types only.
Unity.Mathematics stays permitted for tooling supporting a Unity game; CultLib
uses CultMath.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>