fix(world): remove non-retail portal exit fade

src/AcDream.App/Streaming/StreamingController.cs

@@ -118,7 +118,7 @@ public sealed class StreamingController
     /// so the player arrives to a near-empty world (the "Fort Tethana only one landblock
     /// loaded" symptom) and their cell-walk can't root into neighbour cells yet (the
     /// transient walk-through-walls). The far ring still drains at the budget. The eager
-    /// apply runs during the teleport hold (behind the fade), so the GPU spike is hidden.
+    /// apply runs while the portal viewport replaces the world, so the GPU spike is hidden.
     /// </summary>
     public int PriorityRadius { get; set; }
 
@@ -377,7 +377,7 @@ public sealed class StreamingController
     /// SYNCHRONOUSLY drop every resident landblock (render slot + physics + state) so none
     /// survives into the next frame stale, and no async unload can race a re-bake, then null
     /// the region so the next <see cref="NormalTick"/> re-bootstraps the WHOLE window fresh at
-    /// the new origin (the near ring is priority-applied behind the fade; the rest streams in).
+    /// the new origin (the near ring is priority-applied during portal travel; the rest streams in).
     /// A sealed-dungeon destination uses <see cref="PreCollapseToDungeon"/> instead.
     /// </summary>
     public void ForceReloadWindow()
@@ -405,7 +405,7 @@ public sealed class StreamingController
     /// (rendering at its old world position as "floating terrain at the horizon"), and rapid
     /// hops accumulated them faster than they cleared — a runaway resident count (951 observed
     /// vs a 625 window) that also dragged FPS. Loads inside the teleport near ring
-    /// (<see cref="PriorityRadius"/>, applied behind the fade) likewise bypass the budget so the
+    /// (<see cref="PriorityRadius"/>, applied during portal travel) likewise bypass the budget so the
     /// player materialises in a loaded world.
     /// </summary>
     private void DrainAndApply()