engine cleanup passes 4-7 + multi-instancing ambient rip

Squashes 146 commits from battle-engine-extraction. Net: 2,045 files changed,
+11,896 / -158,687 lines. Ships engine passes 4-7 (dead-code cull, view-layer
stub, receive-path shrink) plus the Phase-5 AsyncLocal ambient deletion that
turns concurrent battles into a type-system property rather than a scope
contract.

## What landed

**Passes 4-7 (chunks 1-34):** Extended the Phase-4 const-false collapse into a
cascading cull across the skill graph, view layer, and receive-path periphery.
Six mode flags (IsWatchBattle/IsReplayBattle/IsAdmin/IsAdminWatch/IsPuzzleQuest/
IsAINetwork) became `const false`, every guarded block deleted. Field*.cs
subclass ctors + BackGroundBase + ObjectChecker culled to no-ops. Mulligan
family reworked to take a mgr param through IMulliganMgr.InitMulligan.
Emotion/Recovery/Resource clusters null-stubbed. Prediction/OperationSimulator/
skill filters converted from static ambient reads to per-mgr reads via
SkillPrm.ownerCard.SelfBattlePlayer.BattleMgr / ins.BattleMgr / this.BattleMgr.

**Phase-5 ambient rip (chunks 35-47):** Deleted BattleAmbient / BattleAmbient-
Context / TestBattleScope in full. Every per-battle mutable slot now lives on
the mgr instance itself:
  mgr.InstanceIsForecast / InstanceIsRandomDraw / InstanceRecoveryInfo /
  InstanceViewerId / InstanceNetworkAgent / GameMgr
BattleManagerBase.GetIns() returns null unconditionally; the residual static
flags + 3 façades (Certification.ViewerId, Data.BattleRecoveryInfo,
ToolboxGame.RealTimeNetworkAgent) are null-tolerant defaults kept for the
handful of engine-internal readers that still reference their types. Zero
BattleAmbient references anywhere in engine + node + tests.

Added pre-seeded GameMgr ctor overload threaded through the mgr chain
(BattleManagerBase → SingleBattleMgr / NetworkBattleManagerBase → NetworkStandard-
BattleMgr → HeadlessBattleMgr / HeadlessNetworkBattleMgr). Fixtures build a
GameMgr, seed it via HeadlessEngineEnv.SeedCharaIds/SeedNetUser, and pass it
to the mgr's ctor — no ambient reach.

Node side (SVSim.BattleNode/SessionBattleEngine): _ctx replaced with a plain
GameMgr field; 34 `using var _ambient = BattleAmbient.Enter(_ctx)` scope wraps
ripped from every accessor and mutator; EngineGlobalInit.WirePerSessionGameMgr
takes GameMgr as a param and runs from SessionBattleEngine.SetupInternal
BEFORE mgr construction.

Test side: TestBattleScope deleted; 18 fixture [SetUp]s migrated to
`HeadlessEngineEnv.EnsureProcessGlobals()`; MultiInstanceEngineTests rewritten
around per-mgr construction (GetIns() → null is the pinned invariant).

## Regression fixes

- **chunk-48** (MulliganCtrl): chunk-35's `= null` stubs on card lookups broke
  the live receive-driven Deal path (BattlePlayerBase.DrawCard NRE'd downstream
  of NetworkPlayerMulliganCtrl.StartMulliganVfx). Restored the three lookups
  via `_battlePlayer.BattleMgr.GetBattleCardIdx`. Engine tests were satisfied
  by the WireMulliganPhase seam; unit tests exposed the live-path gap.

## Ship state

- SVSim.BattleEngine.Tests: 56/56 pass, 2 skip
- SVSim.UnitTests: 1554/1554 pass (was 1523/31-fail before chunk 48)
- Solution build: 0 source warnings (40 pre-existing NU1902 MessagePack CVEs
  in SVSim.EmulatedEntrypoint, unrelated)
- Sequential PVP smoke: verified live (two back-to-back battles, no regression
  on cleanup/spinup)
- Concurrent PVP smoke: verified live

Adds tools/engine-port/ClosureAnalyzer/ — the Roslyn transitive-type-closure
analyzer needed to make future cascade cleanup safe (per feedback memory
"Engine cleanup needs closure tool" from the 2026-06-28 pass-3 failure).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.BattleEngine/Engine/DeckListMenuUI.cs

@@ -35,10 +35,6 @@ public class DeckListMenuUI : MonoBehaviour
 		Lock
 	}
 
-	private const int MAXNUM_DECK_PER_TABLE = 9;
-
-	private const int PAGE_SHOW_LABEL_BORDER = 11;
-
 	[SerializeField]
 	private DeckUI _deckFrameOriginal;
 
@@ -78,8 +74,6 @@ public class DeckListMenuUI : MonoBehaviour
 
 	private bool _isChangePage;
 
-	private float _timeChangePage;
-
 	private List<DeckUI> _deckUIList = new List<DeckUI>();
 
 	private Action _onMultiDeckDelete;
@@ -219,19 +213,6 @@ public class DeckListMenuUI : MonoBehaviour
 		});
 	}
 
-	private void Update()
-	{
-		if (_isChangePage)
-		{
-			_timeChangePage += Time.deltaTime;
-			if (_timeChangePage >= 0.2f)
-			{
-				_isChangePage = false;
-				_timeChangePage = 0f;
-			}
-		}
-	}
-
 	public void UpdateDeckList(DeckGroup deckGroup, Action onFinish)
 	{
 		if (deckGroup != null)
@@ -254,7 +235,7 @@ public class DeckListMenuUI : MonoBehaviour
 		_resourcePathList = new List<string>();
 		List<int> list = new List<int>();
 		List<long> list2 = new List<long>();
-		DataMgr dataMgr = GameMgr.GetIns().GetDataMgr();
+		DataMgr dataMgr = null; // Pre-Phase-5b: headless has no DataMgr
 		for (int i = 1; i < 9; i++)
 		{
 			int skin_id = dataMgr.GetCharaPrmByClassId(i).skin_id;
@@ -679,15 +660,6 @@ public class DeckListMenuUI : MonoBehaviour
 		return true;
 	}
 
-	private IEnumerator DeleteWaitCoroutine()
-	{
-		while (_loadCoroutine != null)
-		{
-			yield return null;
-		}
-		DeleteResource();
-	}
-
 	private void Delete()
 	{
 		if (_loadCoroutine != null)
@@ -757,7 +729,7 @@ public class DeckListMenuUI : MonoBehaviour
 	{
 		if (ChangePage(_currentPage + 1))
 		{
-			GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_SLIDE_BTN);
+
 		}
 	}
 
@@ -765,7 +737,7 @@ public class DeckListMenuUI : MonoBehaviour
 	{
 		if (ChangePage(_currentPage - 1))
 		{
-			GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_SLIDE_BTN);
+
 		}
 	}
 
@@ -791,7 +763,7 @@ public class DeckListMenuUI : MonoBehaviour
 			switch (_editMode)
 			{
 			case EditMode.Default:
-				GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_COMMON_BUTTON);
+
 				this.OnSelectDeck.Call(deckDisplay.Deck);
 				break;
 			case EditMode.MultiDelete:
@@ -811,7 +783,7 @@ public class DeckListMenuUI : MonoBehaviour
 
 	private void OnClickDeckSortStart()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		SetSortMode();
 	}
 
@@ -819,7 +791,7 @@ public class DeckListMenuUI : MonoBehaviour
 	{
 		if (!IsSortDragging && !IsPlayingSortAnimation)
 		{
-			GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_CANCEL);
+
 			SetDefaultMode();
 			List<DeckFrame> list = new List<DeckFrame>();
 			for (int i = 0; i < _deckFrameDefaultList.Count; i++)
@@ -835,7 +807,7 @@ public class DeckListMenuUI : MonoBehaviour
 	{
 		if (!IsSortDragging && !IsPlayingSortAnimation)
 		{
-			GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 			SaveDeckOrder(delegate
 			{
 				SetDefaultMode();
@@ -871,12 +843,6 @@ public class DeckListMenuUI : MonoBehaviour
 		}
 	}
 
-	private void OnDestroy()
-	{
-		_isOnDestroy = true;
-		UIManager.GetInstance().StartCoroutine(DeleteWaitCoroutine());
-	}
-
 	public DeckData GetDeckDataSamePage(DeckData targetDeck)
 	{
 		foreach (PageData page in _pageList)
@@ -908,7 +874,7 @@ public class DeckListMenuUI : MonoBehaviour
 
 	private void OnClickMultiDeckDeleteStartButton()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		SaveDeckOrder(delegate
 		{
 			SetMultiDeleteMode();
@@ -917,7 +883,7 @@ public class DeckListMenuUI : MonoBehaviour
 
 	private void OnClickDeckForMultiDeckDelete(DeckUI deckDisplay)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		deckDisplay.SetVisibleCheckMark(!deckDisplay.IsCheckeMark);
 		deckDisplay.SetColorToGrey(deckDisplay.IsCheckeMark);
 		RefreshMultiDeleteDecideButtonEnable();
@@ -1020,13 +986,13 @@ public class DeckListMenuUI : MonoBehaviour
 
 	private void OnClickMultiDeckDeleteCancelButton()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_CANCEL);
+
 		SetSortMode();
 	}
 
 	private void OnClickMultiDeckDeleteDecideButton()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		ClearBackButtonAction();
 		SystemText systemText = Data.SystemText;
 		DialogBase dialogBase = UIManager.GetInstance().CreateDialogClose();