perf(streaming): quiesce retired generations and budget teardown

Publish the retail blocking-for-cells edge before deferred recenter work, freeze old-world presentation/simulation/audio, and advance full-window retirement from exact metered entity and owner cursors. This removes synchronous portal teardown without allowing retained owners to remain observable.

src/AcDream.App/Streaming/LocalPlayerTeleportController.cs

@@ -674,6 +674,13 @@ internal sealed class LocalPlayerTeleportController
             + $"new lb=({landblockX},{landblockY}) "
             + $"dist={Vector3.Distance(translated, controller.Position):F1}");
 
+        // Retail SmartBox enters blocking_for_cells before old-world object,
+        // physics, landscape, and ambient owners may advance again. Begin the
+        // reveal generation before a recenter can start detaching that world.
+        _worldReveal.Begin(WorldRevealKind.Portal);
+        if (!IsCurrentLifetime(generation, sequence))
+            return false;
+
         Vector3 worldPosition;
         if (transition.ChangesStreamingCenter)
         {
@@ -707,9 +714,6 @@ internal sealed class LocalPlayerTeleportController
         _pendingCell = position.LandblockId;
         _holdSeconds = 0f;
         _forced = false;
-        _worldReveal.Begin(WorldRevealKind.Portal);
-        if (!IsCurrentLifetime(generation, sequence))
-            return false;
         _streaming.SetPriority(
             StreamingRegion.EncodeLandblockId(landblockX, landblockY),
             NearRingRadius);
@@ -746,7 +750,7 @@ internal sealed class LocalPlayerTeleportController
         _holdSeconds = 0f;
         _forced = false;
 
-        bool originConverged = _streaming.ResetRecenter(clearSession);
+        _streaming.ResetRecenter(clearSession);
         if (_lifetimeGeneration != generation)
             return generation;
 
@@ -763,12 +767,6 @@ internal sealed class LocalPlayerTeleportController
 
         _streaming.ClearPriority();
 
-        if (clearSession && !originConverged)
-        {
-            throw new InvalidOperationException(
-                "The ending session's streaming-origin retirement has not converged.");
-        }
-
         return generation;
     }