refactor(streaming): complete landblock presentation cutover

Remove the legacy GameWindow apply path and make the concrete render, physics, and static publishers the only production owner graph. Serialize full-window retirement with shared-origin teleport and session boundaries so old coordinate-frame resources cannot survive into a new world or login.

src/AcDream.Core/Physics/PhysicsEngine.cs

@@ -127,7 +127,8 @@ public sealed class PhysicsEngine
         DataCache?.RemoveBuildingsForLandblock(landblockId);
 
         // #145: if the player's current cell belonged to the landblock being removed (a teleport
-        // drops the stale source center via OnLivePositionUpdated), clear it. Otherwise CurrCell
+        // retires the stale source through StreamingOriginRecenterCoordinator and the presentation
+        // pipeline), clear it. Otherwise CurrCell
         // dangles on an orphaned cell and the dungeon-streaming gate — keyed on CurrCell — keeps
         // streaming collapsed onto the gone landblock, so the destination never streams in and
         // only the skybox renders. Clearing it lets the gate read "not in a dungeon" → the