Enemy computer keepers imprison player minions indefinitely

[cerwym]

Game Logic Flaw:
Enemy computer keepers in campaigns imprison the player's minions, which prevents them from ever dying. This creates an unbalanced gameplay experience.

Issues observed:

1. Enemy computer keepers imprison player's minions (unless there's a cfg option for the level to disable it)
2. Enemy computer keeper prisons never lose health
3. Enemy keepers don't attempt to move imprisoned minions to the torture chamber

Expected Behavior:
Unless explicitly enabled via a level cfg option, enemy computer keepers should not imprison player minions. Additionally, imprisoned creatures should be properly managed (tortured, prison health should degrade, etc.).