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.

tests/AcDream.App.Tests/World/RecallTeleportAnimationTests.cs

@@ -38,6 +38,25 @@ public sealed class RecallTeleportAnimationTests
         Assert.Equal(["objects", "network", "commands", "spatial"], calls);
     }
 
+    [Fact]
+    public void LiveFrame_WhileCellsAreBlocked_DrainsNetworkAndCommandsWithoutWorldTicks()
+    {
+        var calls = new List<string>();
+        var availability = new WorldGenerationAvailabilityState();
+        availability.Begin(1);
+        var frame = new RetailLiveFrameCoordinator(
+            new TestLiveObjectFramePhase(_ => calls.Add("objects")),
+            new GpuWorldState(availability: availability),
+            new TestLiveSessionFramePhase(() => calls.Add("network")),
+            new TestPostNetworkCommandFramePhase(() => calls.Add("commands")),
+            new TestLiveSpatialReconcilePhase(() => calls.Add("spatial")),
+            availability);
+
+        frame.Tick(1f / 60f);
+
+        Assert.Equal(["network", "commands"], calls);
+    }
+
     [Fact]
     public void LiveFrame_InvalidHostDeltaCannotBlockNetworkDispatch()
     {

tests/AcDream.App.Tests/World/UpdateFrameOrchestratorTests.cs

@@ -1,5 +1,6 @@
 using System.Reflection;
 using AcDream.App.Rendering;
+using AcDream.App.Streaming;
 using AcDream.App.Update;
 using AcDream.App.World;
 
@@ -129,6 +130,33 @@ public sealed class UpdateFrameOrchestratorTests
             observed.Camera.Select(value => value.SimulationDeltaSeconds));
     }
 
+    [Fact]
+    public void QuiescedWorld_FreezesScriptClockAndLivenessWhilePortalPhasesContinue()
+    {
+        var calls = new List<string>();
+        var observed = new FrameObservations();
+        var availability = new WorldGenerationAvailabilityState();
+        availability.Begin(7);
+        UpdateFrameOrchestrator frame = Create(
+            calls,
+            observed: observed,
+            availability: availability);
+
+        frame.Tick(new UpdateFrameInput(0.25));
+        frame.Tick(new UpdateFrameInput(0.25));
+        availability.End(7);
+        frame.Tick(new UpdateFrameInput(0.25));
+
+        Assert.Equal([0.0, 0.0, 0.25], observed.PublishedTimes);
+        Assert.Equal(1, calls.Count(call => call == "liveness"));
+        Assert.Equal(3, calls.Count(call => call == "streaming"));
+        Assert.Equal(3, calls.Count(call => call == "network"));
+        Assert.Equal(3, calls.Count(call => call == "teleport"));
+        Assert.Equal(3, calls.Count(call => call == "camera"));
+        Assert.Equal([0.25f, 0.25f, 0.25f], observed.LiveDeltas);
+        Assert.Equal([0.25f, 0.25f, 0.25f], observed.TeleportDeltas);
+    }
+
     [Fact]
     public void Clock_RejectsFiniteDeltaAboveTheSinglePrecisionConsumerRange()
     {
@@ -200,6 +228,7 @@ public sealed class UpdateFrameOrchestratorTests
             typeof(ILocalPlayerTeleportFramePhase),
             typeof(IPlayerModeAutoEntryFramePhase),
             typeof(ICameraFramePhase),
+            typeof(IWorldGenerationAvailability),
         ];
 
         FieldInfo[] fields = typeof(UpdateFrameOrchestrator).GetFields(
@@ -534,7 +563,8 @@ public sealed class UpdateFrameOrchestratorTests
             "new LiveEntityLivenessFramePhase(",
             "session.LocalTeleport,",
             "new PlayerModeAutoEntryFramePhase(",
-            "cameraFrame);");
+            "cameraFrame,",
+            "live.WorldAvailability);");
     }
 
     [Fact]
@@ -860,7 +890,8 @@ public sealed class UpdateFrameOrchestratorTests
         RecordingFailureSink? failureSink = null,
         FrameObservations? observed = null,
         bool teleportPlace = false,
-        bool inboundCreatedPlayer = false)
+        bool inboundCreatedPlayer = false,
+        IWorldGenerationAvailability? availability = null)
     {
         teardown ??= new RecordingTeardown(calls);
         failureSink ??= new RecordingFailureSink();
@@ -875,7 +906,8 @@ public sealed class UpdateFrameOrchestratorTests
             new RecordingLiveness(calls),
             new RecordingTeleport(calls, observed, teleportPlace),
             new RecordingAutoEntry(calls),
-            new RecordingCamera(calls, observed, inboundCreatedPlayer));
+            new RecordingCamera(calls, observed, inboundCreatedPlayer),
+            availability);
     }
 
     private sealed class RecordingTeardown(List<string> calls)