feat(battle-engine): full Unity/VFX/god-object shims + expanded copy closure (2570 files)

Authored Unity primitive/object-model shim, VFX layer (control-flow-preserving, InstantVfx never invokes its action -- headless suppression), god-object stubs (GameMgr/EffectMgr/UIManager with faithfully-extracted nested enums), View/UI/Touch tree, LitJson+BetterList+Tuple copied, third-party stubs. Discovered Roslyn header-error masking: fixing class-header type errors unmasks body references, so the true copy closure is ~2570 files (was 782 under masking). Errors: masked-25720 -> 268; our shim files compile clean. Remaining: ~50 residual shim/external types, 24 NGUI UI-base overrides, static-type fixes, plus likely 1-2 more unmask waves.

SVSim.BattleEngine/Engine/SkillChoiceSelectFilter.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+
+public class SkillChoiceSelectFilter : ISkillSelectFilter
+{
+	private readonly string _context;
+
+	private int _count = 1;
+
+	public int Count => _count;
+
+	public SkillChoiceSelectFilter(string countText)
+	{
+		_context = countText;
+		bool flag = int.TryParse(_context, out _count);
+		_count = ((!flag) ? 1 : _count);
+	}
+
+	public int CalcCount(SkillOptionValue option)
+	{
+		return option.ParseInt(_context);
+	}
+
+	public IEnumerable<BattleCardBase> Filtering(IEnumerable<BattleCardBase> cards, SkillOptionValue option, SkillConditionCheckerOption checkerOption)
+	{
+		_count = CalcCount(option);
+		return cards;
+	}
+}