Enable stationary auto-attack state for pets in Pet Shelter

Pets function normally and attack hostiles when equipped in the active player slot. However, when a pet is unequipped and stationed in the Pet Shelter, its combat logic fails to trigger. The stationed pet plays its ambient/idle animation correctly but completely ignores nearby enemies within its aggro range.

Expected Behavior: Stationed pets should act as active sentries, automatically targeting and attacking enemies that enter the shelter's radius.
Actual Behavior: Stationed pets remain in an idle state and do not attack nearby enemies.

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