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.Scripts.Network.Task.Arena/ArenaRetireTaskBase.cs

@@ -0,0 +1,22 @@
+using Wizard.Scripts.Network.Task.Arena.TwoPick;
+
+namespace Wizard.Scripts.Network.Task.Arena;
+
+public abstract class ArenaRetireTaskBase : BaseTask
+{
+	public ArenaRetireTaskBase()
+	{
+	}
+
+	public abstract void SetParameter();
+
+	public static ArenaRetireTaskBase GetTaskInstance(int mode)
+	{
+		ArenaRetireTaskBase result = null;
+		if (mode == 1)
+		{
+			result = new RetireTask();
+		}
+		return result;
+	}
+}