fix(runtime): restore interaction completion ownership

Preserve prepublication local motion completion, require the PartArray enter-world lifecycle port, and balance deferred Use busy ownership across dispatch and cancellation. Reconcile the completed GameWindow connected gates and add regression coverage.

Co-authored-by: Codex <codex@openai.com>

tests/AcDream.App.Tests/Physics/RemotePhysicsUpdaterTests.cs

@@ -857,6 +857,7 @@ public sealed class RemotePhysicsUpdaterTests
                 Live,
                 Engine.ShadowObjects,
                 (_, _, _) => true,
+                new LiveEntityPartArrayEnterWorldPort(_ => { }),
                 liveCenter: () => (0, 0));
             RegisterShadow(Entity, Remote);
             Assert.True(_presentation.OnLiveEntityReady(Guid));