feat(battle-node): typed Deal/Swap/Ready bodies + PosIdx

SVSim.BattleNode/Protocol/Bodies/DealBody.cs

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+using System.Text.Json.Serialization;
+
+namespace SVSim.BattleNode.Protocol.Bodies;
+
+public sealed record DealBody(
+    [property: JsonPropertyName("self")] IReadOnlyList<PosIdx> Self,
+    [property: JsonPropertyName("oppo")] IReadOnlyList<PosIdx> Oppo,
+    [property: JsonPropertyName("resultCode")] int ResultCode = 1) : IMsgBody;

SVSim.BattleNode/Protocol/Bodies/PosIdx.cs

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+using System.Text.Json.Serialization;
+
+namespace SVSim.BattleNode.Protocol.Bodies;
+
+public sealed record PosIdx(
+    [property: JsonPropertyName("pos")] int Pos,
+    [property: JsonPropertyName("idx")] int Idx);

SVSim.BattleNode/Protocol/Bodies/ReadyBody.cs

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+using System.Text.Json.Serialization;
+
+namespace SVSim.BattleNode.Protocol.Bodies;
+
+public sealed record ReadyBody(
+    [property: JsonPropertyName("self")] IReadOnlyList<PosIdx> Self,
+    [property: JsonPropertyName("oppo")] IReadOnlyList<PosIdx> Oppo,
+    [property: JsonPropertyName("idxChangeSeed")] int IdxChangeSeed,
+    [property: JsonPropertyName("spin")] int Spin,
+    [property: JsonPropertyName("resultCode")] int ResultCode = 1) : IMsgBody;

SVSim.BattleNode/Protocol/Bodies/SwapResponseBody.cs

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+using System.Text.Json.Serialization;
+
+namespace SVSim.BattleNode.Protocol.Bodies;
+
+public sealed record SwapResponseBody(
+    [property: JsonPropertyName("self")] IReadOnlyList<PosIdx> Self,
+    [property: JsonPropertyName("resultCode")] int ResultCode = 1) : IMsgBody;

SVSim.UnitTests/BattleNode/Protocol/Bodies/HandBodiesTests.cs

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+using System.Text.Json;
+using System.Text.Json.Nodes;
+using NUnit.Framework;
+using SVSim.BattleNode.Protocol.Bodies;
+
+namespace SVSim.UnitTests.BattleNode.Protocol.Bodies;
+
+[TestFixture]
+public class HandBodiesTests
+{
+    [Test]
+    public void DealBody_SerializesSelfAndOppoArrays_WithPosIdxKeys()
+    {
+        var body = new DealBody(
+            Self: new[] { new PosIdx(0, 1), new PosIdx(1, 2), new PosIdx(2, 3) },
+            Oppo: new[] { new PosIdx(0, 1), new PosIdx(1, 2), new PosIdx(2, 3) });
+
+        var node = (JsonObject)JsonSerializer.SerializeToNode(body)!;
+        var self = (JsonArray)node["self"]!;
+
+        Assert.That(self.Count, Is.EqualTo(3));
+        Assert.That(((JsonObject)self[0]!)["pos"]!.GetValue<int>(), Is.EqualTo(0));
+        Assert.That(((JsonObject)self[0]!)["idx"]!.GetValue<int>(), Is.EqualTo(1));
+        Assert.That(node["resultCode"]!.GetValue<int>(), Is.EqualTo(1));   // default
+    }
+
+    [Test]
+    public void SwapResponseBody_OnlyContainsSelf_NotOppo()
+    {
+        var body = new SwapResponseBody(
+            Self: new[] { new PosIdx(0, 1), new PosIdx(1, 4), new PosIdx(2, 3) });
+
+        var node = (JsonObject)JsonSerializer.SerializeToNode(body)!;
+
+        Assert.That(node.ContainsKey("self"), Is.True);
+        Assert.That(node.ContainsKey("oppo"), Is.False);
+        Assert.That(((JsonObject)((JsonArray)node["self"]!)[1]!)["idx"]!.GetValue<int>(), Is.EqualTo(4));
+    }
+
+    [Test]
+    public void ReadyBody_SerializesAllFields_IncludingIdxChangeSeedAndSpin()
+    {
+        var body = new ReadyBody(
+            Self: new[] { new PosIdx(0, 1) },
+            Oppo: new[] { new PosIdx(0, 1) },
+            IdxChangeSeed: 771_335_280,
+            Spin: 243);
+
+        var node = (JsonObject)JsonSerializer.SerializeToNode(body)!;
+
+        Assert.That(node["idxChangeSeed"]!.GetValue<int>(), Is.EqualTo(771_335_280));
+        Assert.That(node["spin"]!.GetValue<int>(), Is.EqualTo(243));
+        Assert.That(node["resultCode"]!.GetValue<int>(), Is.EqualTo(1));
+    }
+}