feat(battle-engine): close the AI-simulation subsystem (verbatim)

Copied the 89 uncopied AI*SimulationUtility/extension files defining the
AIVirtualCard/AIVirtualField extension methods; the compile loop then auto-closed
the revealed type deps (~3049 files total, drift-clean). 10.0k -> 62 errors.

SVSim.BattleEngine/Engine/Wizard/UIDestroyUtility.cs

@@ -0,0 +1,14 @@
+using UnityEngine;
+
+namespace Wizard;
+
+public class UIDestroyUtility
+{
+	public static void RemoveChildren(Transform trans)
+	{
+		for (int num = trans.childCount - 1; num >= 0; num--)
+		{
+			Object.DestroyImmediate(trans.GetChild(num).gameObject);
+		}
+	}
+}