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/World/LiveEntityLifecycleStressTests.cs

@@ -564,6 +564,7 @@ public sealed class LiveEntityLifecycleStressTests
                     TypedScripts.Add(type);
                     return true;
                 },
+                new LiveEntityPartArrayEnterWorldPort(_ => { }),
                 liveCenter: () => (1, 1));
             Assert.True(Presentation.OnLiveEntityReady(Guid));