Deadlock tests

Tests/Unit/Integration/Node.cs

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+using Esiur.Resource;
+
+namespace Esiur.Tests.Unit.Integration;
+
+/// <summary>
+/// A minimal distributed resource used to build arbitrary reference topologies (cycles,
+/// cross-references, diamonds) for the deadlock integration tests. <see cref="Links"/> holds
+/// references to other nodes; when a node is fetched the client transitively fetches its links,
+/// which is what exercises EpConnection.FetchResource cycle handling.
+/// </summary>
+[Resource]
+public partial class Node
+{
+    [Export] public int Id { get; set; }
+
+    [Export] public Node[]? Links { get; set; }
+}