fix(world): restore portal and distant use lifecycles

src/AcDream.App/Input/LocalPlayerRuntimeState.cs

@@ -53,7 +53,9 @@ internal sealed class LocalPlayerControllerSlot
     /// and completes StopCompletely, so its MotionDone relay must reach the
     /// candidate interpreter before the complete controller is published.
     /// </summary>
-    public IDisposable BeginMotionPreparation(PlayerMovementController controller)
+    public IDisposable BeginMotionPreparation(
+        PlayerMovementController controller,
+        Action? drainPriorAnimationQueue = null)
     {
         ArgumentNullException.ThrowIfNull(controller);
         if (_preparingMotionOwner is not null)
@@ -62,6 +64,12 @@ internal sealed class LocalPlayerControllerSlot
                 "A local player motion owner is already being prepared.");
         }
 
+        // The live PartArray exists before the local player controller. Drain
+        // any animation completions produced under that prior ownership while
+        // they still resolve to the prior (or null) interpreter. Publishing
+        // the fresh interpreter first would let those old callbacks pop its
+        // new pending_motions queue and leave an unmatched Ready sentinel.
+        drainPriorAnimationQueue?.Invoke();
         _preparingMotionOwner = controller;
         return new MotionPreparation(this, controller);
     }

src/AcDream.App/Input/PlayerModeController.cs

@@ -368,6 +368,7 @@ internal sealed class PlayerModeController :
             ApplyStepHeights(controller, playerEntity);
             uint initialCellId = ResolveInitialCell(playerGuid, playerEntity);
 
+            Action? drainPriorAnimationQueue = null;
             if (_animations.TryGetValue(playerEntity.Id, out LiveEntityAnimationState? animation)
                 && animation.Sequencer is { } sequencer)
             {
@@ -384,6 +385,7 @@ internal sealed class PlayerModeController :
                     sequencer.Manager.CheckForCompletedMotions;
                 controller.Motion.DefaultSink =
                     new MotionTableDispatchSink(sequencer);
+                drainPriorAnimationQueue = sequencer.Manager.HandleEnterWorld;
             }
 
             // Retail CPhysicsObj owns CMotionInterp and CPartArray throughout
@@ -393,7 +395,9 @@ internal sealed class PlayerModeController :
             // public controller slot remains unpublished until every other
             // player-mode edge has prepared successfully.
             using IDisposable motionPreparation =
-                _controllerSlot.BeginMotionPreparation(controller);
+                _controllerSlot.BeginMotionPreparation(
+                    controller,
+                    drainPriorAnimationQueue);
 
             ResolveResult initial = _physics.Resolve(
                 playerEntity.Position,