feat(mosstank): add VTank-style automation PoC

tests/AcDream.App.Tests/Plugins/LocalPluginPeerRegistryTests.cs

@@ -0,0 +1,73 @@
+using AcDream.App.Plugins;
+using AcDream.Plugin.Abstractions;
+
+namespace AcDream.App.Tests.Plugins;
+
+public sealed class LocalPluginPeerRegistryTests
+{
+    [Fact]
+    public void PublishesRemoteClientsIgnoresSelfAndExpiresStaleHeartbeat()
+    {
+        string root = Path.Combine(
+            Path.GetTempPath(),
+            $"acdream-plugin-peers-{Guid.NewGuid():N}");
+        var time = new ManualTimeProvider(
+            new DateTimeOffset(2026, 8, 27, 12, 0, 0, TimeSpan.Zero));
+        try
+        {
+            using var first = new LocalPluginPeerRegistry(
+                root,
+                time,
+                Guid.Parse("11111111-1111-1111-1111-111111111111"));
+            using var second = new LocalPluginPeerRegistry(
+                root,
+                time,
+                Guid.Parse("22222222-2222-2222-2222-222222222222"));
+            first.Publish(Client(first.ClientId, 10u, "Alpha", ["one"]));
+            second.Publish(Client(second.ClientId, 20u, "Beta", ["two"]));
+
+            PluginNetworkClient remote = Assert.Single(
+                first.CaptureRemoteClients());
+            Assert.Equal(second.ClientId, remote.ClientId);
+            Assert.Equal("Beta", remote.Name);
+            Assert.Equal(["two"], remote.Tags);
+            Assert.Equal(33.5d, remote.Position.EastWest);
+
+            time.Advance(LocalPluginPeerRegistry.StaleAfter
+                + TimeSpan.FromMilliseconds(1));
+            Assert.Empty(first.CaptureRemoteClients());
+        }
+        finally
+        {
+            if (Directory.Exists(root))
+                Directory.Delete(root, recursive: true);
+        }
+    }
+
+    private static PluginNetworkClient Client(
+        uint clientId,
+        uint playerId,
+        string name,
+        IReadOnlyList<string> tags) => new(
+            clientId,
+            playerId,
+            name,
+            "Coldeve",
+            new PluginNavigationPosition(
+                0x7F7F0001u, 33.5d, -72.8d, 1d, 90f, true),
+            tags,
+            90u,
+            70u,
+            80u,
+            100u,
+            100u,
+            100u,
+            90f);
+
+    private sealed class ManualTimeProvider(DateTimeOffset utcNow) : TimeProvider
+    {
+        private DateTimeOffset _utcNow = utcNow;
+        public override DateTimeOffset GetUtcNow() => _utcNow;
+        public void Advance(TimeSpan elapsed) => _utcNow += elapsed;
+    }
+}