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/NetworkNullLogger.cs

@@ -0,0 +1,31 @@
+using System.Collections;
+using System.Collections.Generic;
+
+public class NetworkNullLogger : INetworkLogger<NetworkLog>, IEnumerable<NetworkLog>, IEnumerable
+{
+	public void LogInfo(string text)
+	{
+	}
+
+	public void LogError(string text)
+	{
+	}
+
+	public void LogWarning(string text)
+	{
+	}
+
+	public void ClearLog()
+	{
+	}
+
+	public IEnumerator<NetworkLog> GetEnumerator()
+	{
+		yield break;
+	}
+
+	IEnumerator IEnumerable.GetEnumerator()
+	{
+		return GetEnumerator();
+	}
+}