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/ScenarioPart.cs

@@ -0,0 +1,8 @@
+namespace Wizard;
+
+public enum ScenarioPart
+{
+	None,
+	FirstHalf,
+	SecondHalf
+}