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/Wizard/SealedLobby.cs

@@ -36,8 +36,6 @@ public class SealedLobby : MonoBehaviour
 	[SerializeField]
 	private CardSelectDialog _cardSelectDialogPrefab;
 
-	private const int BATTLE_MAX_NUM = 5;
-
 	private List<string> _unloadAssetList = new List<string>();
 
 	private ArenaCommonLobby _commonLobby;
@@ -75,7 +73,7 @@ public class SealedLobby : MonoBehaviour
 		bool flag2 = !SealedData.IsCompletedDeck.Value && !flag;
 		_commonLobby.SetDecisionButtonToDark(flag2);
 		UIManager.SetObjectToGrey(_deckCodeGenerateButton.gameObject, flag2);
-		_incompleteDeckIcon.gameObject.SetActive(flag2 || SealedData.DeckData.GetCardIdList().Any((int id) => GameMgr.GetIns().GetDataMgr().IsMaintenanceCard(id)));
+		_incompleteDeckIcon.gameObject.SetActive(flag2 || false /* Pre-Phase-5b: headless has no maintenance card list */);
 	}
 
 	public void Final()
@@ -89,13 +87,13 @@ public class SealedLobby : MonoBehaviour
 
 	private void OnClickDeckEditButton(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		SealedController.GoToSealedDeckEdit();
 	}
 
 	private void OnClickDeckViewButton(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		StartCoroutine(OpenDeckViewerDialogCoroutine());
 	}
 
@@ -127,19 +125,19 @@ public class SealedLobby : MonoBehaviour
 
 	private void OnClickDeckCodeGenerateButton(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		ArenaCommonLobby.GenerateDeckCode(GenerateDeckCodeTask.SubmitDeckType.SEALED, SealedData.SelectedClassId.Value, SealedData.DeckOriginalExcludedPhantomCardList, SealedData.DeckOriginalPhantomCardList);
 	}
 
 	private void OnClickStageSelectButton(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		DialogCreator.CreateStageSelectDialog();
 	}
 
 	private void OnClickRetireButton(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		ArenaCommonLobby.OpenRetireConfirmDialog().onPushButton1 = delegate
 		{
 			StartCoroutine(Toolbox.NetworkManager.Connect(new SealedRetireTask(), delegate
@@ -151,20 +149,17 @@ public class SealedLobby : MonoBehaviour
 
 	private void OnClickBattleButton()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE_TRANS);
-		DataMgr dataMgr = GameMgr.GetIns().GetDataMgr();
+		// Pre-Phase-5b: DataMgr writes for sealed-mode deck selection (battle type, deck id,
+		// chara/deck data). Purely UI-driven pre-battle setup; headless never runs this
+		// coroutine, and Data.CurrentFormat / UIManager view change are the only observable
+		// outputs the surviving caller cares about.
 		Data.CurrentFormat = Format.Sealed;
-		dataMgr.m_BattleType = DataMgr.BattleType.Sealed;
-		dataMgr.SetSelectDeckId(SealedData.EntryId.Value);
-		dataMgr.LastSelectDeckAttributeType = DeckAttributeType.Invalid;
-		dataMgr.SetPlayerCharaIdByClassId(SealedData.SelectedClassId.Value);
-		dataMgr.SetCurrentDeckData(SealedData.SortedDeckOriginalCardList);
 		UIManager.GetInstance().ChangeViewScene(UIManager.ViewScene.RankMatch);
 	}
 
 	private void OnClickRewardReceiveButton()
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 		StartCoroutine(Toolbox.NetworkManager.Connect(new SealedFinishTask(), delegate
 		{
 			ReceiveReward();
@@ -174,11 +169,11 @@ public class SealedLobby : MonoBehaviour
 	private void ReceiveReward()
 	{
 		_commonLobby.ClickProtectionCollider.gameObject.SetActive(value: true);
-		GameMgr.GetIns().GetInputMgr().isBackKeyEnable = false;
+		// Pre-Phase-5b: headless has no InputMgr
 		_commonLobby.TreasureBoxInfo.OpenBox(delegate
 		{
 			_commonLobby.ClickProtectionCollider.gameObject.SetActive(value: false);
-			GameMgr.GetIns().GetInputMgr().isBackKeyEnable = true;
+			// Pre-Phase-5b: headless has no InputMgr
 			if (SealedData.RewardCardCandidates.Count <= 0)
 			{
 				OpenRewardReceiveDialog();
@@ -194,7 +189,7 @@ public class SealedLobby : MonoBehaviour
 	{
 		DialogBase dialogBase = DialogCreator.CreateRewardReceiveDialog(SealedData.RewardList);
 		dialogBase.SetLayer("Loading");
-		dialogBase.ClickSe_Btn1 = Se.TYPE.SYS_BTN_CANCEL_TRANS;
+		dialogBase.ClickSe_Btn1 = 0;
 		dialogBase.OnClose = (Action)Delegate.Combine(dialogBase.OnClose, (Action)delegate
 		{
 			UIManager.GetInstance().ChangeViewScene(UIManager.ViewScene.MyPage);
@@ -220,7 +215,7 @@ public class SealedLobby : MonoBehaviour
 		CardSelectDialog dialogObject = NGUITools.AddChild(dialog.gameObject, _cardSelectDialogPrefab.gameObject).GetComponent<CardSelectDialog>();
 		dialogObject.Init(SealedData.RewardCardCandidates, delegate(int cardId)
 		{
-			GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_BTN_DECIDE);
+
 			OpenCardSelectConfirmDialog(dialog, cardId);
 		}, systemText.Get("Sealed_RewardCardSelect_0002"));
 		while (!dialogObject.IsReady)