feat(battle-engine M13): M3 spell emits PlayActions headless via OperateMgr -> NetworkBattleSender (O1 read = GO)

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

SVSim.BattleEngine/Shim/View/HeadlessHandViewStub.cs

@@ -0,0 +1,28 @@
+// AUTHORED SHIM (not copied). A non-null no-op HandViewBase the headless emit path needs.
+//
+// On the OperateMgr/network play path, BattlePlayerBase.SetupActionProcessorEvent subscribes an
+// OnBeforePlayCard handler that calls BattleView.HandView.RemoveCardFromView (BattlePlayerBase.cs:1422) —
+// a pure presentation-layer hand-card removal. The m1_stub_gen generated IBattlePlayerView.HandView getter
+// returns default! (null), so the call NREs. The direct-ActionProcessor solo oracles never hit this
+// (SetupActionProcessorEvent is OperateMgr-only). Seed a single shared no-op HandViewBase whose card-view
+// list is non-null so RemoveCardFromView is a safe no-op (the played card is never in this view's list, so
+// the abstract RearrangeHand is never reached). Nothing here touches game state.
+
+using UnityEngine;
+
+namespace Wizard.Battle.View
+{
+    public sealed class HeadlessHandViewStub : HandViewBase
+    {
+        // Shared instance the generated IBattlePlayerView.HandView getters return headless.
+        public static readonly HeadlessHandViewStub Instance = new HeadlessHandViewStub();
+
+        // Base param ctor initializes the protected _battleCardViewList (the default ctor leaves it null,
+        // which RemoveCardFromView would NRE on). CreateHandControl is overridden to a null no-op below.
+        public HeadlessHandViewStub() : base(null, null) { }
+
+        protected override void RearrangeHand(float rearrangeTime, bool isNewReplayMoveTurn = false) { }
+
+        protected override HandControl CreateHandControl(GameObject handGameObject, BattleCamera battleCamera) => null;
+    }
+}