feat: add resilient reconnect and catch-up replay

tests/SuiteLink.Client.Tests/Transport/SuiteLinkTcpTransportTests.cs

@@ -114,6 +114,38 @@ public sealed class SuiteLinkTcpTransportTests
             async () => await listener.AcceptTcpClientAsync(secondAcceptCts.Token));
     }
 
+    [Fact]
+    public async Task ResetConnectionAsync_AfterConnect_AllowsReconnect()
+    {
+        using var listener = new TcpListener(IPAddress.Loopback, 0);
+        listener.Start();
+
+        var endpoint = (IPEndPoint)listener.LocalEndpoint;
+        await using var transport = new SuiteLinkTcpTransport();
+
+        await transport.ConnectAsync(endpoint.Address.ToString(), endpoint.Port);
+        using var accepted1 = await listener.AcceptTcpClientAsync();
+
+        await transport.ResetConnectionAsync();
+        Assert.False(transport.IsConnected);
+
+        await transport.ConnectAsync(endpoint.Address.ToString(), endpoint.Port);
+        using var accepted2 = await listener.AcceptTcpClientAsync();
+
+        Assert.True(transport.IsConnected);
+    }
+
+    [Fact]
+    public async Task ResetConnectionAsync_LeaveOpenTrue_DoesNotDisposeInjectedStream()
+    {
+        var stream = new TrackingStream();
+        await using var transport = new SuiteLinkTcpTransport(stream, leaveOpen: true);
+
+        await transport.ResetConnectionAsync();
+
+        Assert.False(stream.WasDisposed);
+    }
+
     private sealed class PartialReadStream : Stream
     {
         private readonly MemoryStream _inner;