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/EpSetModifier.cs

@@ -0,0 +1,16 @@
+public class EpSetModifier : ICardEpModifier
+{
+	private readonly int m_ep;
+
+	public bool IsClearBeforeModifier => true;
+
+	public EpSetModifier(int ep)
+	{
+		m_ep = ep;
+	}
+
+	public int CalcEp(int baseEp)
+	{
+		return m_ep;
+	}
+}