refactor(net): cut GameWindow over to session owner

tests/AcDream.App.Tests/Net/GameWindowLiveSessionOwnershipTests.cs

@@ -0,0 +1,37 @@
+using System.Reflection;
+using AcDream.App.Rendering;
+using AcDream.App.Net;
+using AcDream.Core.Net;
+
+namespace AcDream.App.Tests.Net;
+
+public sealed class GameWindowLiveSessionOwnershipTests
+{
+    private const BindingFlags PrivateInstance =
+        BindingFlags.Instance | BindingFlags.NonPublic;
+
+    [Fact]
+    public void GameWindowRetainsOnlyTheLifecycleControllerSessionOwner()
+    {
+        FieldInfo[] fields = typeof(GameWindow).GetFields(PrivateInstance);
+
+        Assert.Contains(
+            fields,
+            field => field.Name == "_liveSessionController"
+                && field.FieldType == typeof(LiveSessionController));
+        Assert.DoesNotContain(fields, field => field.Name == "_liveSession");
+        Assert.DoesNotContain(fields, field => field.FieldType == typeof(WorldSession));
+        Assert.DoesNotContain(fields, field => field.Name == "_liveSessionEvents");
+        Assert.DoesNotContain(fields, field => field.Name == "_liveSessionCommands");
+    }
+
+    [Theory]
+    [InlineData("TryStartLiveSession")]
+    [InlineData("ClearInboundEntityState")]
+    [InlineData("WireLiveSessionEvents")]
+    [InlineData("DisposeLiveSessionRouting")]
+    public void DisplacedLifecycleBodiesAreAbsent(string methodName)
+    {
+        Assert.Null(typeof(GameWindow).GetMethod(methodName, PrivateInstance));
+    }
+}