fix(motion): restore retail object manager order

Process animation completion at the retail process_hooks boundary, then run targeting, movement, PartArray completion, and PositionManager in the named UpdateObjectInternal order for local, remote, hidden, and position-less animated objects. Retire TS-42 with deterministic conformance coverage.\n\nCo-authored-by: OpenAI Codex <codex@openai.com>

src/AcDream.Core/Physics/RetailObjectManagerTail.cs

@@ -0,0 +1,28 @@
+namespace AcDream.Core.Physics;
+
+/// <summary>
+/// Executes the manager tail of retail
+/// <c>CPhysicsObj::UpdateObjectInternal</c> (<c>0x005156B0</c>).
+/// </summary>
+/// <remarks>
+/// The order is observable. In particular, animation completion hooks have
+/// already run when this tail begins, so MoveTo may react to a completion in
+/// the same object quantum. A null callback represents an absent retail
+/// manager; it is not a separate execution path.
+/// </remarks>
+public static class RetailObjectManagerTail
+{
+    public static void Run(
+        Action? checkDetection,
+        Action? handleTargeting,
+        Action? movementUseTime,
+        Action? partArrayHandleMovement,
+        Action? positionUseTime)
+    {
+        checkDetection?.Invoke();
+        handleTargeting?.Invoke();
+        movementUseTime?.Invoke();
+        partArrayHandleMovement?.Invoke();
+        positionUseTime?.Invoke();
+    }
+}