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

src/AcDream.Core/World/PhysicsDatBundle.cs

@@ -6,11 +6,10 @@ using DatEnvironment = DatReaderWriter.DBObjs.Environment;
 namespace AcDream.Core.World;
 
 /// <summary>
-/// The parsed dat objects <c>ApplyLoadedTerrainLocked</c> needs, pre-read by the
-/// streaming worker under <c>_datLock</c> so the apply makes ZERO DatCollection
-/// calls and the update thread never blocks on the worker's lock (the FPS
-/// 30↔200 swing was that lock-wait). Keyed by the same dat id the apply would
-/// have passed to <c>_dats.Get&lt;T&gt;</c>.
+/// Parsed DAT closure produced by <c>LandblockBuildFactory</c> under the shared
+/// reader gate and consumed by the render-thread presentation publishers.
+/// Publication makes zero DatCollection calls, so the update thread never
+/// blocks on worker DAT access. Entries retain their original DAT IDs.
 /// </summary>
 public sealed record PhysicsDatBundle(
     LandBlockInfo? Info,