Deadlock tests

Tests/Distribution/Deadlock/Server/Node.cs

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+using Esiur.Resource;
+using Esiur.Tests.Deadlock.Server;
+
+/// <summary>
+/// Resource used to build reference topologies (cycles, cross-references) for the distributed
+/// deadlock test. <see cref="Links"/> holds references to other nodes; fetching a node transitively
+/// fetches its links, which is what exercises EpConnection.FetchResource cycle handling.
+/// Property indices are stable: Id = 0, Links = 1.
+/// </summary>
+[Resource]
+public partial class Node
+{
+    [Export] public int Id { get; set; }
+
+    [Export] public Node[]? Links { get; set; }
+
+    [Export] public Resource1[] Resources1 { get; set; }
+    [Export] public Resource2[] Resources2 { get; set; }
+}