feat(battle-node): BuildOpponentJudge builder for v1.2 turn-end Judge

Adds the third frame of the burst. Wire shape from prod (spin + resultCode).
OpponentJudgeSpin const next to OpponentTurnStartSpin for consistency.
Single test locks uri, ViewerId, Cat, and body shape.

SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs

@@ -117,6 +117,16 @@ public static class ScriptedLifecycle
     public static MsgEnvelope BuildOpponentTurnEnd() =>
         EnvelopeForPush(NetworkBattleUri.TurnEnd, new TurnEndBody(TurnState: 0));
 
+    /// <summary>
+    /// Server-pushed Judge frame that follows the opponent's TurnEnd and unblocks the
+    /// client's <c>JudgeOperation</c> → <c>ControlTurnStartPlayer</c>, transitioning to the
+    /// player's next turn. Without this frame the client hangs on "Opponent's turn…" —
+    /// see <c>data_dumps/captures/battle-traffic.ndjson</c> line 14 (client emits its own
+    /// Judge then waits forever).
+    /// </summary>
+    public static MsgEnvelope BuildOpponentJudge() =>
+        EnvelopeForPush(NetworkBattleUri.Judge, new JudgeBody(Spin: ScriptedProfiles.OpponentJudgeSpin));
+
     private static IReadOnlyList<PosIdx> BuildPosIdxList(IReadOnlyList<long> hand)
     {
         var list = new List<PosIdx>(hand.Count);

SVSim.BattleNode/Lifecycle/ScriptedProfiles.cs

@@ -51,4 +51,11 @@ internal static class ScriptedProfiles
     // display state. v1 doesn't simulate the opponent — once this lands,
     // the client sits there indefinitely.
     public const int OpponentTurnStartSpin = 100;
+
+    /// <summary>
+    /// Server-pushed Judge frame spin value. Prod varies per push (55, 175, 73, ...) — it's
+    /// an animation seed, not a stateful value. Fixed at 100 here for test stability;
+    /// the client's <c>JudgeOperation</c> doesn't read it.
+    /// </summary>
+    public const int OpponentJudgeSpin = 100;
 }

SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs

@@ -166,6 +166,19 @@ public class ScriptedLifecycleTests
         Assert.That(body.ResultCode, Is.EqualTo(1));
     }
 
+    [Test]
+    public void BuildOpponentJudge_emits_Judge_uri_with_spin_and_default_result_code()
+    {
+        var env = ScriptedLifecycle.BuildOpponentJudge();
+
+        Assert.That(env.Uri, Is.EqualTo(NetworkBattleUri.Judge));
+        Assert.That(env.ViewerId, Is.EqualTo(ScriptedLifecycle.FakeOpponentViewerId));
+        Assert.That(env.Cat, Is.EqualTo(EmitCategory.Battle));
+        var body = (JudgeBody)env.Body;
+        Assert.That(body.Spin, Is.EqualTo(ScriptedProfiles.OpponentJudgeSpin));
+        Assert.That(body.ResultCode, Is.EqualTo(1));
+    }
+
     private static MatchContext FixtureCtx(IReadOnlyList<long>? deck = null) => new(
         SelfDeckCardIds: deck ?? Enumerable.Range(1, 30).Select(i => 100_011_010L).ToList(),
         ClassId: "1", CharaId: "1", CardMasterName: "card_master_node_10015",