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/Shim/View/SettingsUiStubs.cs

@@ -24,8 +24,8 @@ namespace Wizard.ErrorDialog
     // back to the static Wizard.Data god-object (CS0718/0722/0723 + missing ButtonType).
     public class Data
     {
-        public enum ContactDisplayType { _NONE_, 表示, MAX }
-        public enum ButtonType { _NONE_, OK, リトライ, タイトルへ戻る, ホームへ戻る, アプリ終了, バージョンアップ, 推奨端末一覧, MAX }
+        public enum ContactDisplayType { }
+        public enum ButtonType { _NONE_, OK, リトライ, タイトルへ戻る, ホームへ戻る, アプリ終了, バージョンアップ, 推奨端末一覧}
 
         public string TitleId { get; private set; }
         public string BodyId { get; private set; }
@@ -41,7 +41,7 @@ namespace Wizard.ErrorDialog
 
 namespace Wizard.Battle.UI
 {
-    public enum CantAttackType { Null, All, Class, NotHasGuard, Unit, Max }
+    public enum CantAttackType { Null, All, Class, NotHasGuard, Unit}
 }
 
 namespace Wizard.Battle.View
@@ -96,50 +96,26 @@ namespace Wizard.Battle.View.Vfx
 
 namespace AnimationOrTween
 {
-    public enum DisableCondition { DisableAfterReverse = -1, DoNotDisable, DisableAfterForward }
-    public enum EnableCondition { DoNothing, EnableThenPlay, IgnoreDisabledState }
+    public enum DisableCondition { DoNotDisable}
+    public enum EnableCondition { EnableThenPlay, IgnoreDisabledState }
 }
 
 namespace Wizard.UI.LoginBonus
 {
-    public class ContinuousData { public ContinuousData(LitJson.JsonData jsonData) { } }
-    public class NormalData { public NormalData(LitJson.JsonData jsonData) { } }
-    public class SpecialData { public SpecialData(LitJson.JsonData jsonData) { } }
-    public class FreeCardPackBoxData { public FreeCardPackBoxData(LitJson.JsonData jsonData) { } }
 }
 
 namespace DeckBuilder
 {
     public partial class GenerateDeckCode { }
-    public partial class GetDeckDataFromCode { }
-}
-
-namespace Wizard.Story.ChapterSelection.SelectionProcessing.BattleResult
-{
-    public interface IProcessing
-    {
-        IProcessing NextProcessing { get; set; }
-        void Execute(Parameter param);
-    }
-    // Parameter is generated full-surface (ctor + props) in Shim/Generated/Parameter__*.g.cs
 }
 
 namespace Wizard.RoomMatch
 {
-    public partial class PlayerControllerForWatching { }  // SEND_PARAMETER enum is in Generated/PlayerControllerForWatching.g.cs
     public partial class RoomRuleSetting { }
 }
 
 namespace Cute
 {
-    public class SceneChangeParameter { public bool KeepAssets; public SceneType BeforeScene; public SceneType NextScene; public string NextState; }
-    public class SceneManager
-    {
-        public SceneChangeParameter SceneChangeParameter = new SceneChangeParameter();
-        public void ChangeScene(string next_scene) { }
-        public void ChangeScene(string next_scene, string active_state) { }
-        public void ChangeScene(SceneType type, string active_state = "") { }
-    }
 }
 
 namespace Wizard.Story
@@ -147,54 +123,18 @@ namespace Wizard.Story
     public enum StoryApiType { None, MainStory, LimitedStory, EventStory }
     public partial class SelectedStoryInfo { }
     public partial class StoryWorldDataManager { }
-    public sealed class StoryWorldData { }  // signature-only type pulled by StoryWorldDataManager full-surface (non-battle)
 }
 
 namespace Wizard.Title
 {
-    // ITitleProc impls pulled by full-surface stubs; referenced as signature types only (non-battle).
-    public class BattleRecovery { }
-    public class ResourceDownloader { }
-    public class TemporaryAssetDeleter { }
 }
 
 namespace BestHTTP.SocketIO
 {
-    // BestHTTP SDK types — minimal hand shim (full-surface would pull the whole SocketIO
-    // closure). Node-server real-time socket path is Phase-2; these are off the battle path.
-    public sealed class Packet { public System.Collections.Generic.List<byte[]> Attachments { get; set; } }
-    public delegate void SocketIOCallback(Socket socket, Packet packet, params object[] args);
-    public sealed class Socket
-    {
-        public string Id => "";
-        public Socket On(string eventName, SocketIOCallback callback) => this;
-        public Socket On(BestHTTP.SocketIO.SocketIOEventTypes type, SocketIOCallback callback) => this;
-        public Socket Off(string eventName) => this;
-        public Socket Off() => this;
-        public Socket Emit(string eventName, params object[] args) => this;
-    }
-    public class SocketOptions
-    {
-        public bool AutoConnect { get; set; }
-        public Transports.TransportTypes ConnectWith { get; set; }
-        public PlatformSupport.Collections.ObjectModel.ObservableDictionary<string, string> AdditionalQueryParams { get; set; }
-    }
-    public sealed class SocketManager
-    {
-        public enum States { Initial, Opening, Open, Paused, Pausing, Reconnecting, Closed }
-        public SocketManager(System.Uri uri) { }
-        public SocketManager(System.Uri uri, SocketOptions options) { }
-        public States State => States.Closed;
-        public Socket Socket { get; } = new Socket();
-        public Socket this[string nsp] => Socket;
-        public void Open() { }
-        public void Close() { }
-        public void SettingRealtimeNetworkAgent(object agent) { }
-    }
 }
 
 // ---- namespace anchors (referenced via `using`/qualified path; no type used yet) ----
-namespace Wizard.Scripts.Network.Task { internal class _ShimAnchor { } }
-namespace Wizard.Scripts.Network.Task.Arena { internal class _ShimAnchor { } }
-namespace Wizard.Scripts.Network.Task.Arena.TwoPick { internal class _ShimAnchor { } }
-namespace BestHTTP.Decompression.Zlib { internal class _ShimAnchor { } }
+namespace Wizard.Scripts.Network.Task { }
+namespace Wizard.Scripts.Network.Task.Arena { }
+namespace Wizard.Scripts.Network.Task.Arena.TwoPick { }
+namespace BestHTTP.Decompression.Zlib { }