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/DeckDecisionUI.cs

@@ -9,17 +9,6 @@ using Wizard.RoomMatch;
 
 public class DeckDecisionUI : MonoBehaviour
 {
-	[SerializeField]
-	private UILabel _textForOneLine;
-
-	[SerializeField]
-	private UILabel _descTextLabel;
-
-	[SerializeField]
-	private UILabel _deckNameTextLabel;
-
-	[SerializeField]
-	private ItemToggle m_simpleStageToggle;
 
 	[SerializeField]
 	private GameObject _uiCardListPrefab;
@@ -27,17 +16,10 @@ public class DeckDecisionUI : MonoBehaviour
 	[SerializeField]
 	private GameObject _cardDetailPrefab;
 
-	[SerializeField]
-	private UILabel _optionLabel;
-
 	protected List<string> _loadCardAssetList;
 
-	private bool _textSetEnd;
-
 	protected static int DetailLayer;
 
-	protected const float CARD_DETAIL_Z = -300f;
-
 	private ConventionDeckList conventionDeckList;
 
 	public bool IsCanShowQRCode = true;
@@ -48,8 +30,6 @@ public class DeckDecisionUI : MonoBehaviour
 
 	public string DeckName { get; set; }
 
-	public UILabel OptionLabel => _optionLabel;
-
 	public Action<UICardList> CardListCustomize { get; set; }
 
 	protected CardDetailUI CardDetail { get; set; }
@@ -67,74 +47,6 @@ public class DeckDecisionUI : MonoBehaviour
 		_formatBehavior = FormatBehaviorManager.Create(deck.Format, deckList);
 	}
 
-	public virtual void Start()
-	{
-		DetailLayer = LayerMask.NameToLayer("MyPage");
-		UIWidget component = GetComponent<UIWidget>();
-		if (!_textSetEnd)
-		{
-			_descTextLabel.text = Data.SystemText.Get("Card_0006");
-			_deckNameTextLabel.text = Data.SystemText.Get("Card_0299", DeckName);
-			SetTextLabelesState(string.IsNullOrEmpty(_descTextLabel.text), string.IsNullOrEmpty(_deckNameTextLabel.text));
-		}
-		if (IsShowSimpleStageOption)
-		{
-			SettingToggle_SimpleStage();
-			component.pivot = UIWidget.Pivot.Center;
-		}
-		else
-		{
-			m_simpleStageToggle.gameObject.SetActive(value: false);
-			component.pivot = UIWidget.Pivot.Bottom;
-		}
-	}
-
-	public void SetText(string descText, string cardDeckText)
-	{
-		_textForOneLine.text = descText;
-		_descTextLabel.text = descText;
-		_deckNameTextLabel.text = cardDeckText;
-		SetTextLabelesState(string.IsNullOrEmpty(descText), string.IsNullOrEmpty(cardDeckText));
-		_textSetEnd = true;
-	}
-
-	protected void OnDestroy()
-	{
-		if (_loadCardAssetList != null)
-		{
-			Toolbox.ResourcesManager.RemoveAssetGroup(_loadCardAssetList);
-			_loadCardAssetList = null;
-		}
-		if (UiCardList != null)
-		{
-			UnityEngine.Object.Destroy(UiCardList.gameObject);
-			UiCardList = null;
-		}
-		if (CardDetail != null)
-		{
-			UnityEngine.Object.Destroy(CardDetail.gameObject);
-			CardDetail = null;
-		}
-	}
-
-	protected ItemToggle SettingToggle_SimpleStage(bool isSperatorUse = true)
-	{
-		SystemText systemText = Data.SystemText;
-		ItemToggle item = m_simpleStageToggle;
-		item.SetTitleLabel(systemText.Get("OtherConfig_0022"));
-		item.SetValue(PlayerPrefsWrapper.GetBool(PlayerPrefsWrapper.SIMPLE_STAGE));
-		item.AddChangeCallback(delegate
-		{
-			bool value = item.GetValue();
-			PlayerPrefsWrapper.SetBool(PlayerPrefsWrapper.SIMPLE_STAGE, value);
-		});
-		if (isSperatorUse)
-		{
-			item.SetActive_SeparatorLine(isActive: true);
-		}
-		return item;
-	}
-
 	public void OnClickCreateCardList()
 	{
 		CheckTimeSlipRotationPeriodTask task = new CheckTimeSlipRotationPeriodTask();
@@ -223,23 +135,4 @@ public class DeckDecisionUI : MonoBehaviour
 	{
 		UIManager.GetInstance().ActiveChangeDialogAll(inDisp);
 	}
-
-	private void SetTextLabelesState(bool noDescText, bool noDeckNameText)
-	{
-		if (noDescText && noDeckNameText)
-		{
-			_textForOneLine.gameObject.SetActive(value: false);
-			_descTextLabel.gameObject.SetActive(value: false);
-			_deckNameTextLabel.gameObject.SetActive(value: false);
-		}
-		else if (noDeckNameText)
-		{
-			_descTextLabel.gameObject.SetActive(value: false);
-			_deckNameTextLabel.gameObject.SetActive(value: false);
-		}
-		else
-		{
-			_textForOneLine.gameObject.SetActive(value: false);
-		}
-	}
 }