perf(streaming): reserve destination reveal capacity

Join destination scheduling to the canonical reveal generation, protect its share across every typed frame-budget dimension, and prevent stale work from clearing a replacement reservation. Remove forced incomplete materialization and project retail's centered portal wait cue while the authored tunnel remains active.

Tests: Release build clean; 91 focused reservation/reveal tests; full solution 8,158 passed, 5 skipped.

Co-authored-by: Codex <noreply@openai.com>

src/AcDream.App/Composition/LivePresentationComposition.cs

@@ -829,6 +829,20 @@ internal sealed class LivePresentationCompositionPhase
             "portal depth mask",
             () => new PortalDepthMaskRenderer(d.Gl),
             static value => value.Dispose());
+        CompositionAcquisitionScope.CompositionAcquisitionLease<
+            PortalWaitNoticeController>? portalWaitNoticeLease = null;
+        if (interaction.RetainedUi is { } portalRetainedUi)
+        {
+            portalWaitNoticeLease = scope.Acquire(
+                "portal wait notice",
+                () => new PortalWaitNoticeController(
+                    portalRetainedUi.Host.Root),
+                static value => value.Dispose());
+        }
+        Action<string?>? displayPortalWaitNotice =
+            portalWaitNoticeLease is { } waitNoticeLease
+                ? waitNoticeLease.Resource.Set
+                : null;
         PortalTunnelPresentation portalTunnel;
         try
         {
@@ -840,7 +854,9 @@ internal sealed class LivePresentationCompositionPhase
                     d.HookRouter,
                     dispatcherLease.Resource,
                     foundation.SceneLighting,
-                    foundation.MeshAdapter),
+                    foundation.MeshAdapter,
+                    displayPortalWaitNotice,
+                    portalWaitNoticeLease?.Resource),
                 static tunnel => tunnel.PrepareResources());
         }
         catch (Exception acquisitionFailure)
@@ -1006,6 +1022,7 @@ internal sealed class LivePresentationCompositionPhase
         clipFrameLease.Transfer();
         portalDepthLease.Transfer();
         portalTunnelLease.Transfer();
+        portalWaitNoticeLease?.Transfer();
         skyLease.Transfer();
         skyShaderLease.Transfer();
         particleLease.Transfer();

src/AcDream.App/Composition/SessionPlayerComposition.cs

@@ -339,7 +339,8 @@ internal sealed class SessionPlayerCompositionPhase
             live.DrawDispatcher.InvalidateCompositeWarmupReadiness,
             spawnClaimClassifier.IsUnhydratable,
             d.Log,
-            worldQuiescence);
+            worldQuiescence,
+            streaming);
         Fault(SessionPlayerCompositionPoint.WorldRevealCreated);
 
         return CompleteSessionPlayer(