checkpoint: preserve cathedral look-in investigation state

src/AcDream.App/Rendering/RetailPViewPassExecutor.cs

@@ -138,6 +138,13 @@ internal sealed partial class RetailPViewPassExecutor :
     private readonly Dictionary<uint, int> _singleCellClipRouting = new(1);
     private readonly Dictionary<uint, int> _noCellClipRouting = new(0);
 
+    // ACDREAM_PROBE_WALK_ROOT / cathedral FW4: observation-only counters.
+    // They distinguish the walk-owned far-Z portal punches from the retired
+    // legacy look-in punch route. RetailPViewRenderer samples them for the
+    // diagnostic comparison after the walk-turn look-in routes have replayed.
+    internal int WalkLookInPunchCountThisFrame { get; private set; }
+    internal int LegacyLookInPunchCountThisFrame { get; private set; }
+
     /// <summary>
     /// Borrowed until the next late landscape pass. The outdoor-root post-world
     /// particle pass consumes this synchronously before another PView frame.
@@ -181,7 +188,11 @@ internal sealed partial class RetailPViewPassExecutor :
     {
         _particleClassifications.BeginFrame();
         if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled)
+        {
             AcDream.Core.Rendering.RenderingDiagnostics.WalkRootPhase = "pre";
+            WalkLookInPunchCountThisFrame = 0;
+            LegacyLookInPunchCountThisFrame = 0;
+        }
     }
 
     /// <summary>Campaign FW3.2b-2: the shared dispatcher, for
@@ -596,8 +607,19 @@ internal sealed partial class RetailPViewPassExecutor :
     public void DrawLookInPortalPunch(
         RetailPViewFrameInput frame,
         RetailPViewCellSliceContext context,
-        int portalIndex) =>
+        int portalIndex)
+    {
+        if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled)
+        {
+            LegacyLookInPunchCountThisFrame++;
+            Console.WriteLine(
+                $"[lookin-punch] source=legacy viewer=0x{frame.ViewerCellId:X8} "
+                + $"root=0x{frame.RootCell.CellId:X8} cell=0x{context.CellId:X8} "
+                + $"portal={portalIndex} planes={context.Slice.Planes.Length} "
+                + $"phase={AcDream.Core.Rendering.RenderingDiagnostics.WalkRootPhase}");
+        }
         DrawPortalDepthWrite(context, frame, forceFarZ: true, portalIndex);
+    }
 
     public void DrawUnattachedSceneParticles(
         RetailPViewFrameInput frame,