feat(network)!: add v2 framing, pooled buffers and bounded dispatch

Adapters~/MessagePack/README.md

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+# Generated MessagePack adapter
+
+独立可选包。Unity 先安装 MessagePack-CSharp 3.1.8（含其生成器及依赖），再通过 UPM 引用本目录。此目录放在 `Adapters~` 下，不让未安装 MessagePack 的项目产生缺失程序集错误。.NET 使用 `ShrinkSDK.Network.MessagePack`。
+
+消息使用 `[MessagePackObject]`、稳定 `[Key(n)]` 和生成的 resolver。构造 `ShrinkNetwork.MessagePack.ShrinkMessagePackNetworkSerializer` 时显式传入 resolver，再为每个消息调用 `Register<T>()`。未注册或没有 formatter 的类型明确报错；不回退到 Contractless／动态 IL／反射调用。
+
+在绑定 transport 前注册；停止使用相关消息后才能撤回 codec。共享合同不能依赖 Unity 对象或引擎专属类型。双方必须使用相同合同与消息编码。
+
+可编译示例与生成式互通测试：Workspace `Tools/AgentSupport/RuntimeTests/NetworkCodecTests.cs`。

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Adapters~/MessagePack/Runtime.meta

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Adapters~/MessagePack/Runtime/ShrinkMessagePackNetworkSerializer.cs

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+#nullable enable
+using System;
+using System.Buffers;
+using MessagePack;
+using MessagePack.Formatters;
+
+namespace ShrinkNetwork.MessagePack
+{
+    /// <summary>Pass a generated-only resolver; register all message types before starting transports.</summary>
+    public sealed class ShrinkMessagePackNetworkSerializer : ShrinkRegisteredNetworkSerializer
+    {
+        private readonly MessagePackSerializerOptions _options;
+        public ShrinkMessagePackNetworkSerializer(IFormatterResolver generatedResolver)
+        {
+            _options = MessagePackSerializerOptions.Standard
+                .WithResolver(global::MessagePack.Resolvers.CompositeResolver.Create(
+                    generatedResolver ?? throw new ArgumentNullException(nameof(generatedResolver)),
+                    global::MessagePack.Resolvers.BuiltinResolver.Instance))
+                .WithSecurity(MessagePackSecurity.UntrustedData);
+        }
+        public void Register<T>() => Register(new FormatterCodec<T>(_options));
+
+        private sealed class FormatterCodec<T> : IShrinkMessageCodec<T>
+        {
+            private readonly IMessagePackFormatter<T> _formatter;
+            private readonly MessagePackSerializerOptions _options;
+            public FormatterCodec(MessagePackSerializerOptions options)
+            {
+                _options = options;
+                _formatter = options.Resolver.GetFormatter<T>() ?? throw new InvalidOperationException($"No generated MessagePack formatter for {typeof(T).FullName}.");
+            }
+            public void Write(IBufferWriter<byte> buffer, T value)
+            {
+                var writer = new MessagePackWriter(buffer);
+                _formatter.Serialize(ref writer, value, _options);
+                writer.Flush();
+            }
+            public T Read(ReadOnlyMemory<byte> payload)
+            {
+                var reader = new MessagePackReader(payload);
+                var result = _formatter.Deserialize(ref reader, _options);
+                if (!reader.End) throw new System.IO.InvalidDataException("Trailing MessagePack payload.");
+                return result;
+            }
+        }
+    }
+}

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Adapters~/MessagePack/Runtime/ShrinkNetwork.MessagePack.asmdef

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+{
+  "name": "ShrinkNetwork.MessagePack",
+  "references": ["ShrinkNetwork.Runtime"],
+  "autoReferenced": true,
+  "noEngineReferences": true
+}

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Adapters~/MessagePack/ShrinkSDK.Network.MessagePack.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <PackageId>ShrinkSDK.Network.MessagePack</PackageId>
+    <Version>0.1.0</Version>
+    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Runtime/**/*.cs" />
+    <PackageReference Include="MessagePack" Version="3.1.8" />
+    <PackageReference Include="ShrinkSDK.Network" Version="0.4.2" />
+  </ItemGroup>
+</Project>

Adapters~/MessagePack/package.json

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+{
+  "name": "com.cneicy.shrink-network-messagepack",
+  "version": "0.1.0",
+  "displayName": "Shrink Network MessagePack",
+  "description": "Explicit generated MessagePack codecs for ShrinkNetwork protocol v2. Requires MessagePack-CSharp 3.1.8.",
+  "unity": "2022.3",
+  "dependencies": {
+    "com.cneicy.shrink-network": "0.4.2"
+  }
+}

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