refactor(animation): extract live PartArray presenter

Move final live part composition, exact-incarnation schedule handoff, MotionDone binding, and presentation diagnostics out of GameWindow while preserving the retail frame order. Reject stale schedule and completion ABA at the new owner boundary.

Co-Authored-By: OpenAI Codex <codex@openai.com>

src/AcDream.App/Rendering/ILiveStaticPartFrameSource.cs

@@ -0,0 +1,21 @@
+using AcDream.App.World;
+using AcDream.Core.Physics;
+using AcDream.Core.World;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Late presentation handoff from retail's separate
+/// <c>static_animating_objects</c> workset. Every take is bound to the exact
+/// live incarnation that prepared the frames.
+/// </summary>
+internal interface ILiveStaticPartFrameSource
+{
+    bool TryTakeLivePartFrames(
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation,
+        ulong objectClockEpoch,
+        ulong projectionMutationVersion,
+        out IReadOnlyList<PartTransform> frames);
+}