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/GatheringMatchedRoom.cs

@@ -0,0 +1,15 @@
+namespace Wizard;
+
+public class GatheringMatchedRoom
+{
+	private const string NO_MATCHED_ROOM_ID = "0";
+
+	public string RoomId { get; private set; }
+
+	public bool IsMatched => RoomId != "0";
+
+	public GatheringMatchedRoom(string roomId)
+	{
+		RoomId = roomId;
+	}
+}