refactor(world): extract live entity network updates

Move Position, Vector, State, Movement, and equal-generation CreateObject routing out of GameWindow while preserving per-channel authority, ForcePosition acknowledgement, and motion-runtime ownership. Add adversarial authority and exact-wire coverage so reentrant updates and GUID reuse cannot publish stale state.

src/AcDream.App/World/LiveEntitySameGenerationUpdateRouter.cs

@@ -0,0 +1,48 @@
+using AcDream.Core.Net;
+using AcDream.Core.Net.Messages;
+using AcDream.Core.Physics;
+
+namespace AcDream.App.World;
+
+internal interface ILiveEntitySameGenerationUpdateSink
+{
+    void OnDescription(uint ownerGuid, PhysicsSpawnData description);
+    void OnAppearance(ObjDescEvent.Parsed appearance);
+    void OnParent(CreateParentUpdate parent);
+    void OnPosition(WorldSession.EntityPositionUpdate position);
+    void OnPickup(PickupEvent.Parsed pickup);
+    void OnMovement(WorldSession.EntityMotionUpdate movement);
+    void OnState(SetState.Parsed state);
+    void OnVector(VectorUpdate.Parsed vector);
+}
+
+/// <summary>
+/// Pins the equal-generation <c>CObjectMaint::CreateObject</c> tail order from
+/// retail <c>SmartBox::HandleCreateObject @ 0x00454C80</c>. The leading
+/// PhysicsDesc effect-profile refresh is the isolated AP-119 adaptation; the
+/// retail tail then remains ObjDesc, one Position relation, Movement, State,
+/// and Vector. Each channel still owns an independent timestamp gate.
+/// </summary>
+internal static class LiveEntitySameGenerationUpdateRouter
+{
+    public static void Apply(
+        SameGenerationCreateObjectEvents refresh,
+        ILiveEntitySameGenerationUpdateSink sink)
+    {
+        ArgumentNullException.ThrowIfNull(sink);
+        sink.OnDescription(refresh.Appearance.Guid, refresh.Description);
+        sink.OnAppearance(refresh.Appearance);
+
+        if (refresh.Parent is { } parent)
+            sink.OnParent(parent);
+        else if (refresh.Position is { } position)
+            sink.OnPosition(position);
+        else if (refresh.Pickup is { } pickup)
+            sink.OnPickup(pickup);
+
+        if (refresh.Movement is { } movement)
+            sink.OnMovement(movement);
+        sink.OnState(refresh.State);
+        sink.OnVector(refresh.Vector);
+    }
+}