feat(rendering): establish current-path scene referee

Capture deterministic, landblock-aware fingerprints from the accepted partition only during lifecycle automation. This gives the F/G shadow scene an independent oracle without changing normal draw decisions or adding disabled-path per-entity cost.

src/AcDream.App/Rendering/RetailPViewRenderer.cs

@@ -12,6 +12,7 @@ namespace AcDream.App.Rendering;
 /// </summary>
 public sealed class RetailPViewRenderer
 {
+    private readonly InteriorEntityPartition.IObserver? _partitionObserver;
     private readonly PortalVisibilityFrame _mainPortalFrameScratch = new();
     private readonly ClipFrameAssembly _clipAssemblyScratch = new();
     private readonly ViewconeCuller _viewconeScratch = new();
@@ -63,6 +64,16 @@ public sealed class RetailPViewRenderer
     private readonly HashSet<uint> _drawableCellsScratch = new();
     private readonly RetailPViewScratchRetention _scratchRetention = new();
 
+    public RetailPViewRenderer()
+    {
+    }
+
+    internal RetailPViewRenderer(
+        InteriorEntityPartition.IObserver? partitionObserver)
+    {
+        _partitionObserver = partitionObserver;
+    }
+
     // T2 (BR-4): retail has NO distance constant on the flood-admission chain
     // (DrawBuilding → portal walk → ConstructView: viewconeCheck + side test +
     // GetClip + GetVisible only). The old 48 m seed cap is replaced by the
@@ -156,7 +167,11 @@ public sealed class RetailPViewRenderer
 
         passes.PrepareCellBatches(ctx, prepareCells);
 
-        InteriorEntityPartition.Partition(_partitionResult, prepareCells, ctx.LandblockEntries);
+        InteriorEntityPartition.Partition(
+            _partitionResult,
+            prepareCells,
+            ctx.LandblockEntries,
+            _partitionObserver);
         var partition = _partitionResult;
         RetailPViewFrameResult result = _frameResultScratch.Reset(
             pvFrame,