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/MyPageSpecialWinRewardDialog.cs

@@ -9,7 +9,6 @@ namespace Wizard;
 
 public class MyPageSpecialWinRewardDialog : MonoBehaviour
 {
-	private const string GRADE_GAUGE_NAME = "gauge_bg_scale_15";
 
 	private float[] _memoryValue = new float[16]
 	{
@@ -17,8 +16,6 @@ public class MyPageSpecialWinRewardDialog : MonoBehaviour
 		0.67f, 0.738f, 0.806f, 0.875f, 0.943f, 1f
 	};
 
-	private const int TREASURE_BOX_SPRITE_GRADE = 5;
-
 	[SerializeField]
 	private UISprite _boxSprite;
 
@@ -92,8 +89,7 @@ public class MyPageSpecialWinRewardDialog : MonoBehaviour
 
 	private void OnClickBoxReceiveRewards(GameObject g)
 	{
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_LOTTERY_BOX_TOUCH);
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_COMMON_BUTTON);
+
 		MypageReceiveSpecialTreasureTask receiveSpecialTreasureTask = new MypageReceiveSpecialTreasureTask();
 		receiveSpecialTreasureTask.SetParameter();
 		UIManager.GetInstance().StartCoroutine(Toolbox.NetworkManager.Connect(receiveSpecialTreasureTask, delegate
@@ -129,7 +125,7 @@ public class MyPageSpecialWinRewardDialog : MonoBehaviour
 		yield return UIManager.GetInstance().StartCoroutine(Toolbox.ResourcesManager.LoadAssetGroupAsync(list, null));
 		_treasureEffectObj = UnityEngine.Object.Instantiate(Toolbox.ResourcesManager.LoadObject(Toolbox.ResourcesManager.GetAssetTypePath(loadEffectName, ResourcesManager.AssetLoadPathType.Effect2D, isfetch: true)) as GameObject);
 		_treasureEffectObj.transform.parent = _boxOpenEffectObj.transform;
-		GameMgr.GetIns().GetEffectMgr().SetUIParticleShader(_treasureEffectObj, null);
+		/* Pre-Phase-5b: SetUIParticleShader dropped */
 		_boxOpenEffectObj.SetLayer(LayerMask.NameToLayer("SystemUI"), isSetChildren: true);
 		bg.alpha = 0f;
 		box.alpha = 0f;
@@ -147,7 +143,7 @@ public class MyPageSpecialWinRewardDialog : MonoBehaviour
 		yield return new WaitForSeconds(0.8f);
 		TweenAlpha.Begin(label.gameObject, 0.5f, 0f);
 		iTween.MoveTo(box.gameObject, iTween.Hash("x", 0f, "time", 0.7f, "islocal", true, "easetype", iTween.EaseType.easeInOutExpo));
-		GameMgr.GetIns().GetSoundMgr().PlaySe(Se.TYPE.SYS_2PICK_BOX_OPEN);
+
 		yield return new WaitForSeconds(1f);
 		_treasureEffectObj.transform.localPosition = box.transform.localPosition;
 		_treasureEffectObj.transform.localScale = Vector3.one * 320f * 1.75f;