perf(tests): isolate network E2E and await QUIC cleanup

backend/agent/src/MoShiro.Agent/AgentApp.cs

@@ -11,7 +11,7 @@ using MoShiro.Protocol;
 namespace MoShiro.Agent;
 
 /// <summary>Agent 的组装点：数据面、点对点监听、与 Backend 的链路都在这里接起来。没有全局状态，测试可以在同一进程里启动多个。</summary>
-public sealed class AgentApp : IDisposable
+public sealed class AgentApp : IDisposable, IAsyncDisposable
 {
     public const string Version = MoShiro.Protocol.BuildInfo.Version;
 
@@ -40,6 +40,7 @@ public sealed class AgentApp : IDisposable
     private readonly TaskManager _tasks;
     private readonly TestRunner _tests;
     private readonly FleetLink _link;
+    private int _disposed;
 
     /// <param name="dataDirectory">配置目录（容器里的 <c>/etc/moshiro</c>）：宿主机更新器和节点在这里交换清单、请求和状态。</param>
     public AgentApp(AgentConfig config, LoadedNodeIdentity identity, string dataDirectory, TimeProvider time, INodeLog log, RestartController? restart = null)
@@ -113,10 +114,26 @@ public sealed class AgentApp : IDisposable
 
     public void Dispose()
     {
+        if (Interlocked.Exchange(ref _disposed, 1) != 0)
+        {
+            return;
+        }
+
         _datagrams.Dispose();
         _ownedRestart?.Dispose();
     }
 
+    public async ValueTask DisposeAsync()
+    {
+        if (Interlocked.Exchange(ref _disposed, 1) != 0)
+        {
+            return;
+        }
+
+        await _datagrams.DisposeAsync().ConfigureAwait(false);
+        _ownedRestart?.Dispose();
+    }
+
     internal StreamRegistry Streams => _streams;
 
     public IReadOnlyList<int> QuicPorts => _datagrams.BoundPorts;

backend/agent/src/MoShiro.Agent/Program.cs

@@ -43,7 +43,7 @@ catch (Exception ex) when (ex is IOException or InvalidDataException or InvalidO
 using var restartScope = restart;
 using (identity)
 {
-    using var app = new AgentApp(config, identity, Path.GetDirectoryName(Path.GetFullPath(configPath))!, time, log, restart);
+    await using var app = new AgentApp(config, identity, Path.GetDirectoryName(Path.GetFullPath(configPath))!, time, log, restart);
     await ServiceShell.RunAsync(app.RunAsync, log, restart, time);
 }