refactor(runtime): close simulation ownership

Move remote-motion construction, CreateObject vector initialization, final simulation-component retirement, and the combined J5 ownership ledger into Runtime. Delete App compatibility views and moved-state reconstruction while preserving the existing graphical projection and retail update order.

src/AcDream.Runtime/Entities/RuntimeEntityObjectLifetime.cs

@@ -32,7 +32,29 @@ public readonly record struct RuntimeEntityObjectOwnershipSnapshot(
     bool HasLastStreamDispatchFailure,
     int PendingDispatchCount,
     bool IsDispatching,
-    bool IsSessionClearInProgress);
+    bool IsSessionClearInProgress,
+    bool IsDisposed)
+{
+    public bool IsConverged =>
+        IsDisposed
+        && ActiveEntityCount == 0
+        && TeardownEntityCount == 0
+        && ClaimedLocalIdCount == 0
+        && AcceptedSnapshotCount == 0
+        && UnresolvedParentRelationCount == 0
+        && StagedParentRelationCount == 0
+        && RecoveryParentRelationCount == 0
+        && CommittedParentRelationCount == 0
+        && ObjectCount == 0
+        && ContainerCount == 0
+        && ContainerProjectionCount == 0
+        && EquipmentOwnerCount == 0
+        && PendingMoveCount == 0
+        && StreamSubscriberCount == 0
+        && PendingDispatchCount == 0
+        && !IsDispatching
+        && !IsSessionClearInProgress;
+}
 
 /// <summary>
 /// One exact DeleteObject acceptance issued by a
@@ -140,7 +162,8 @@ public sealed class RuntimeEntityObjectLifetime : IDisposable
             Events.LastDispatchFailure is not null,
             Events.PendingDispatchCount,
             Events.IsDispatching,
-            _sessionClearInProgress);
+            _sessionClearInProgress,
+            _disposed);
     }
 
     public void BindEventContext(
@@ -355,17 +378,7 @@ public sealed class RuntimeEntityObjectLifetime : IDisposable
             Entities.RetainTeardown(canonical);
             try
             {
-                Physics.RemoveSpatialProjection(canonical);
-                Entities.SetRemoteMotion(canonical, null);
-                Entities.SetRemoteMotionBindingInProgress(canonical, false);
-                Entities.SetProjectile(canonical, null);
-                Entities.SetProjectileBindingInProgress(canonical, false);
-                Entities.SetRequiresRemotePlacementRuntime(canonical, false);
-                Entities.SetPhysicsHost(canonical, null);
-                Entities.SetPhysicsBody(canonical, null);
-                Entities.SetPhysicsBodyAcquisitionInProgress(canonical, false);
-                Entities.SetHasPartArray(canonical, false);
-                Entities.ReleaseLocalId(canonical);
+                CompleteProjectionRetirement(canonical);
             }
             finally
             {
@@ -379,6 +392,30 @@ public sealed class RuntimeEntityObjectLifetime : IDisposable
         }
     }
 
+    /// <summary>
+    /// Completes the presentation acknowledgement for one retained
+    /// incarnation. Runtime retires every presentation-independent component
+    /// and releases its local identity only after the graphical host has
+    /// finished using those exact components for ExitWorld teardown.
+    /// </summary>
+    internal void CompleteProjectionRetirement(
+        RuntimeEntityRecord canonical)
+    {
+        EnsureNotDisposed();
+        ArgumentNullException.ThrowIfNull(canonical);
+        Physics.RemoveSpatialProjection(canonical);
+        Entities.SetRemoteMotion(canonical, null);
+        Entities.SetRemoteMotionBindingInProgress(canonical, false);
+        Entities.SetProjectile(canonical, null);
+        Entities.SetProjectileBindingInProgress(canonical, false);
+        Entities.SetRequiresRemotePlacementRuntime(canonical, false);
+        Entities.SetPhysicsHost(canonical, null);
+        Entities.SetPhysicsBody(canonical, null);
+        Entities.SetPhysicsBodyAcquisitionInProgress(canonical, false);
+        Entities.SetHasPartArray(canonical, false);
+        Entities.ReleaseLocalId(canonical);
+    }
+
     /// <summary>
     /// Applies the retained-object half of an accepted CreateObject while the
     /// exact canonical incarnation and its integration version remain current.

src/AcDream.Runtime/Entities/RuntimeEntityObjectViews.cs

@@ -85,6 +85,7 @@ internal sealed class RuntimeEntityObjectViews
         : IRuntimeEntityView
     {
         public int Count => owner.Count;
+        public int MaterializedCount => owner.ClaimedLocalIdCount;
 
         public bool TryGet(
             uint serverGuid,