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/SpellSkillCollection.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+using System.Linq;
+using Wizard;
+using Wizard.Battle.View.Vfx;
+
+public class SpellSkillCollection : SkillCollectionBase
+{
+	public SpellSkillCollection(BattleCardBase ownerCard)
+		: base(ownerCard)
+	{
+	}
+
+	public override VfxWith<SkillProcessor.ProcessInfo> CreateWhenPlayInfo(BattleCardBase playCard, SkillProcessor skillProcessor, BattlePlayerReadOnlyInfoPair playerInfoPair, SkillConditionCheckerOption option)
+	{
+		SkillProcessor.ProcessInfo value = CreateProcessInfo((SkillBase s) => s.OnWhenPlayStart, skillProcessor, playerInfoPair, option);
+		return new VfxWith<SkillProcessor.ProcessInfo>(NullVfx.GetInstance(), value);
+	}
+
+	public override bool CheckWhenPlayCondition(BattlePlayerReadOnlyInfoPair playerInfoPair, bool isPrePlay)
+	{
+		List<SkillBase> list = _skillList.Where((SkillBase s) => s.IsWhenPlaySkill).ToList();
+		SkillBase item = list.First((SkillBase s) => s is Skill_spell_charge);
+		list.Remove(item);
+		return list.Any((SkillBase s) => s.CheckCondition(playerInfoPair, new SkillConditionCheckerOption(), isPrePlay));
+	}
+}