feat(battle-engine-port): M2 step 1 — SingleBattleMgr constructs headless

First green of the M2 go/no-go probe: `new SingleBattleMgr(StandardBattleMgr-
ContentsCreator)` now builds the two-player pair fully headless against the shim,
no Unity runtime. Verdict: headless construction is feasible; every blocker was a
mechanical no-op shim fill or data seam, not a Unity/logic wall.

Shim fills (authored):
- GameMgr: lazy non-null DataMgr/PrefabMgr/InputMgr/SoundMgr/BattleControl.
- GameObject: lazy cached component model so GetComponent<T>/AddComponent<T> return
  non-null no-op instances for Component-derived T (F1: unguarded view touches).
- Resources.Load(string): cached non-null GameObject so the prefab->Instantiate->
  GetComponent chain (UnityEventAgent) yields a real object.
- ClassBattleCardViewBase: re-attach dropped IClassBattleCardView (no-op members);
  ClassBattleCardBase.Setup casts the created view to it.

Engine copy (DP1/DP3 mis-cut fix):
- CardIconControl.cs copied verbatim (manifested) + generated null-stub deleted.
  SplitAndCompleteIconStr is pure string logic on the resolution path that M1 had
  wrongly stubbed as "View" -> null deref in SkillCreator.CreateBuildInfo.

Test harness (SVSim.BattleEngine.Tests, authored fixture):
- HeadlessContentsCreator/HeadlessPhaseCreator: deterministic replica of the solo
  practice init (StandardBattleMgrContentsCreator + SingleBattlePhaseCreator) with
  no-op recovery/replay managers.
- HeadlessCardMaster: reflects the loader cards.json dump into CardMaster.
- HeadlessMasterData: minimal Data.Master (class-character list, empty collections)
  + Data.Load + player/enemy chara ids.
- ConstructionProbeTests.SingleBattleMgr_constructs_headless — GREEN.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/Generated/CardIconControl.g.cs

@@ -1,10 +0,0 @@
-// AUTO-GENERATED no-op stubs (m1_stub_gen) from Shadowverse_Code_2026-05-23\Wizard.Battle.View\CardIconControl.cs
-using System;
-namespace Wizard.Battle.View
-{
-public partial class CardIconControl
-{
-        public static string[] SplitAndCompleteIconStr(string iconStr, string[] skillTypeStr) => default!;
-        public static string CompleteIconDefaultParam(int skillCount) => default!;
-}
-}

SVSim.BattleEngine/Shim/GodObjects/GodObjects.cs

@@ -110,12 +110,15 @@ public class GameMgr
     private NetworkUserInfoData _netUser;
 
     public EffectMgr GetEffectMgr() => _effect ??= new EffectMgr();
-    public SoundMgr GetSoundMgr() => _sound;
-    public DataMgr GetDataMgr() => _data;
+    public SoundMgr GetSoundMgr() => _sound ??= new SoundMgr();
+    // Headless: hand back non-null no-op instances. The copied manager types are pure
+    // data/dictionary/no-op holders (no Unity in their ctors); the resolution-path ctor
+    // dereferences these immediately (CreateBackgroundId / CreateManager / UnityEventAgent wiring).
+    public DataMgr GetDataMgr() => _data ??= new DataMgr();
     public GameObjMgr GetGameObjMgr() => _gameObj;
-    public PrefabMgr GetPrefabMgr() => _prefab;
-    public InputMgr GetInputMgr() => _input;
-    public BattleControl GetBattleCtrl() => _battleCtrl;
+    public PrefabMgr GetPrefabMgr() => _prefab ??= new PrefabMgr();
+    public InputMgr GetInputMgr() => _input ??= new InputMgr();
+    public BattleControl GetBattleCtrl() => _battleCtrl ??= new BattleControl();
     public NetworkUserInfoData GetNetworkUserInfoData() => _netUser;
     public void SetNetworkUserInfoData(NetworkUserInfoData infoData) => _netUser = infoData;
     public Wizard.MailTopTask GetMailTopTask() => null;

SVSim.BattleEngine/Shim/UnityEngine/UnityRuntime.cs

@@ -50,8 +50,19 @@ namespace UnityEngine
     {
         public static T Load<T>(string path) where T : Object => null;
         public static T Load<T>(string path, Type t) where T : Object => null;
-        public static Object Load(string path) => null;
-        public static Object Load(string path, Type t) => null;
+        // Headless: the non-generic Load is used by the copied PrefabMgr to back a prefab
+        // dictionary that the resolution-path ctor then Instantiate()s + GetComponent()s
+        // (e.g. Prefab/Game/UnityEventAgent). Return a cached no-op GameObject per path so that
+        // chain yields a non-null object. Typed asset loads go through the generic Load<T> (null).
+        private static readonly System.Collections.Generic.Dictionary<string, GameObject> _loaded
+            = new System.Collections.Generic.Dictionary<string, GameObject>();
+        public static Object Load(string path)
+        {
+            if (string.IsNullOrEmpty(path)) return null;
+            if (!_loaded.TryGetValue(path, out var go)) { go = new GameObject(path); _loaded[path] = go; }
+            return go;
+        }
+        public static Object Load(string path, Type t) => Load(path);
         public static T[] LoadAll<T>(string path) where T : Object => new T[0];
         public static Object[] LoadAll(string path) => new Object[0];
         public static ResourceRequest LoadAsync<T>(string path) where T : Object => null;

SVSim.BattleEngine/Shim/UnityEngine/UnityShim.cs

@@ -185,8 +185,25 @@ namespace UnityEngine
         public int layer { get; set; }
         public string tag { get; set; }
         public void SetActive(bool value) { }
-        public T GetComponent<T>() => default;
-        public Component GetComponent(Type t) => null;
+
+        // Headless component model: the resolution-path ctor (and copied views) acquire components
+        // off prefab GameObjects and use them unguarded (F1). Lazily create + cache a no-op instance
+        // per concrete Component-derived type so those touches resolve harmlessly instead of NRE.
+        // Non-Component T or abstract/uninstantiable T still returns default (null).
+        private System.Collections.Generic.Dictionary<Type, object> _components;
+        private object GetOrAddComponent(Type t)
+        {
+            if (t == null || t.IsAbstract || !typeof(Component).IsAssignableFrom(t)) return null;
+            _components ??= new System.Collections.Generic.Dictionary<Type, object>();
+            if (_components.TryGetValue(t, out var c)) return c;
+            object inst;
+            try { inst = Activator.CreateInstance(t); }
+            catch { return null; }
+            _components[t] = inst;
+            return inst;
+        }
+        public T GetComponent<T>() => (T)(GetOrAddComponent(typeof(T)) ?? default(T));
+        public Component GetComponent(Type t) => (Component)GetOrAddComponent(t);
         public Component GetComponent(string t) => null;
         public T GetComponentInChildren<T>() => default;
         public T GetComponentInChildren<T>(bool includeInactive) => default;
@@ -196,8 +213,8 @@ namespace UnityEngine
         public T GetComponentInParent<T>(bool includeInactive) => default;
         public T[] GetComponents<T>() => new T[0];
         public Component[] GetComponents(Type t) => new Component[0];
-        public T AddComponent<T>() where T : Component => default;
-        public Component AddComponent(Type t) => null;
+        public T AddComponent<T>() where T : Component => (T)(GetOrAddComponent(typeof(T)) ?? default(T));
+        public Component AddComponent(Type t) => (Component)GetOrAddComponent(t);
         public void SendMessage(string method) { }
         public void SendMessage(string method, object value) { }
         public void SendMessage(string method, object value, SendMessageOptions options) { }

SVSim.BattleEngine/Shim/View/SettingsUiStubs.cs

@@ -48,7 +48,18 @@ namespace Wizard.Battle.View
 {
     // Decomp bases (dropped by the hand stub): both derive from BattleCardView, which
     // carries the IBattleCardView impl — so they convert to IBattleCardView via it.
-    public abstract class ClassBattleCardViewBase : BattleCardView { }
+    // The decomp ClassBattleCardViewBase also implements IClassBattleCardView; the resolution
+    // path casts the created view to it (ClassBattleCardBase.Setup), so re-attach the dropped
+    // interface here with no-op members (the leaf PlayerClassBattleCardView inherits them).
+    public abstract class ClassBattleCardViewBase : BattleCardView, IClassBattleCardView
+    {
+        public virtual Wizard.Battle.Player.ClassCharacter.IClassCharacter ClassCharacter => null;
+        public virtual void StartOutFrame() { }
+        public virtual void StartIntoFrame() { }
+        public virtual float GetCurrentClipTime() => 0f;
+        public virtual bool GetCurrentClipIsName(global::ClassCharaPrm.MotionType motionType) => false;
+        public virtual void ClearSpineObject() { }
+    }
     public class NullBattleCardView : BattleCardView { public NullBattleCardView() { } public NullBattleCardView(BuildInfo buildInfo) { } public static void ReleaseSharedDummy() { } }
 }