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.Scripts.Network.Data.TaskData.ItemPurchase/ItemPurchaseBuyTask.cs

@@ -4,9 +4,6 @@ public class ItemPurchaseBuyTask : BaseTask
 {
 	public class ItemPurchaseBuyTaskParam : BaseParam
 	{
-		public int purchase_id;
-
-		public int rest;
 	}
 
 	public ItemPurchaseBuyTask()
@@ -14,14 +11,6 @@ public class ItemPurchaseBuyTask : BaseTask
 		base.type = ApiType.Type.ItemPurchaseBuy;
 	}
 
-	public void SetParameter(int purchaseId, int rest)
-	{
-		ItemPurchaseBuyTaskParam itemPurchaseBuyTaskParam = new ItemPurchaseBuyTaskParam();
-		itemPurchaseBuyTaskParam.purchase_id = purchaseId;
-		itemPurchaseBuyTaskParam.rest = rest;
-		base.Params = itemPurchaseBuyTaskParam;
-	}
-
 	protected override int Parse()
 	{
 		int num = base.Parse();

SVSim.BattleEngine/Engine/Wizard.Scripts.Network.Data.TaskData.ItemPurchase/ItemPurchaseData.cs

@@ -1,30 +0,0 @@
-namespace Wizard.Scripts.Network.Data.TaskData.ItemPurchase;
-
-public class ItemPurchaseData
-{
-	public int purchase_id { get; set; }
-
-	public UserGoods.Type purchase_item_type { get; set; }
-
-	public long PurchaseUserGoodsId { get; set; }
-
-	public int purchase_item_num { get; set; }
-
-	public string purchase_name { get; set; }
-
-	public UserGoods.Type require_item_type { get; set; }
-
-	public long RequireUserGoodsId { get; set; }
-
-	public int require_item_num { get; set; }
-
-	public bool isMonthryReset { get; set; }
-
-	public string purchase_begin_time { get; set; }
-
-	public string purchase_end_time { get; set; }
-
-	public int rest { get; set; }
-
-	public string textureName { get; set; }
-}

SVSim.BattleEngine/Engine/Wizard.Scripts.Network.Data.TaskData.ItemPurchase/ItemPurchaseInfo.cs

@@ -4,7 +4,4 @@ namespace Wizard.Scripts.Network.Data.TaskData.ItemPurchase;
 
 public class ItemPurchaseInfo
 {
-	private List<ItemPurchaseData> _itemPurchaseList = new List<ItemPurchaseData>();
-
-	public List<ItemPurchaseData> itemPurchaseList => _itemPurchaseList;
 }

SVSim.BattleEngine/Engine/Wizard.Scripts.Network.Data.TaskData.ItemPurchase/ItemPurchaseInfoTask.cs

@@ -1,56 +0,0 @@
-using LitJson;
-
-namespace Wizard.Scripts.Network.Data.TaskData.ItemPurchase;
-
-public class ItemPurchaseInfoTask : BaseTask
-{
-	public ItemPurchaseInfoTask()
-	{
-		base.type = ApiType.Type.ItemPurchaseInfo;
-	}
-
-	protected override int Parse()
-	{
-		int num = base.Parse();
-		if (num != 1)
-		{
-			return num;
-		}
-		Wizard.Data.ItemPurchaseInfo.itemPurchaseList.Clear();
-		JsonData jsonData = base.ResponseData["data"]["item_purchase_info"];
-		for (int i = 0; i < jsonData.Count; i++)
-		{
-			ItemPurchaseData itemData = new ItemPurchaseData();
-			itemData.purchase_id = jsonData[i]["purchase_id"].ToInt();
-			itemData.purchase_item_type = (UserGoods.Type)jsonData[i]["purchase_item_type"].ToInt();
-			itemData.PurchaseUserGoodsId = jsonData[i]["purchase_item_id"].ToLong();
-			itemData.purchase_item_num = jsonData[i]["purchase_item_num"].ToInt();
-			itemData.purchase_name = jsonData[i]["purchase_name"].ToString();
-			if (string.IsNullOrEmpty(itemData.purchase_name))
-			{
-				string userGoodsName = UserGoods.getUserGoodsName(itemData.purchase_item_type, itemData.PurchaseUserGoodsId);
-				itemData.purchase_name = Wizard.Data.SystemText.Get("Shop_0132", userGoodsName.ToString(), itemData.purchase_item_num.ToString());
-			}
-			itemData.require_item_type = (UserGoods.Type)jsonData[i]["require_item_type"].ToInt();
-			itemData.RequireUserGoodsId = jsonData[i]["require_item_id"].ToLong();
-			itemData.require_item_num = jsonData[i]["require_item_num"].ToInt();
-			itemData.isMonthryReset = ((jsonData[i]["is_monthly_reset"].ToInt() != 0) ? true : false);
-			itemData.rest = jsonData[i]["rest"].ToInt();
-			if (itemData.purchase_item_type == UserGoods.Type.Item)
-			{
-				itemData.textureName = Wizard.Data.Master.ItemList.Find((Item data) => data.UserGoodsId == itemData.PurchaseUserGoodsId).thumbnail;
-			}
-			else
-			{
-				itemData.textureName = UserGoods.GetUserGoodsImageName(itemData.purchase_item_type, itemData.PurchaseUserGoodsId);
-			}
-			Wizard.Data.ItemPurchaseInfo.itemPurchaseList.Add(itemData);
-		}
-		JsonData jsonData2 = base.ResponseData["data"]["user_card_pack_ticket_list"];
-		for (int num2 = 0; num2 < jsonData2.Count; num2++)
-		{
-			PlayerStaticData.UpdateItemNum(jsonData2[num2]["item_id"].ToInt(), jsonData2[num2]["number"].ToInt());
-		}
-		return num;
-	}
-}