fix(render): apply retail marker admission to the walk

src/AcDream.App/Rendering/Wb/WbDrawDispatcher.DirectionalShadows.cs

@@ -1270,6 +1270,9 @@ public sealed partial class WbDrawDispatcher
         // directly", correct for the non-Setup flat-MeshRef caller below.
         bool? entityHasCutoutSubsetOverride = null)
     {
+        if (_meshAdapter.IsRuntimeHiddenMarker(meshRef.GfxObjId))
+            return;
+
         bool entityHasCutoutSubset = entityHasCutoutSubsetOverride ?? renderData.HasCutoutSubset;
         for (int batchIndex = 0;
              batchIndex < renderData.Batches.Count;

src/AcDream.App/Rendering/Wb/WbDrawDispatcher.WalkClassify.cs

@@ -223,6 +223,9 @@ public sealed partial class WbDrawDispatcher
         for (int partIndex = 0; partIndex < meshRefs.Count; partIndex++)
         {
             MeshRef meshRef = meshRefs[partIndex];
+            if (_meshAdapter.IsRuntimeHiddenMarker(meshRef.GfxObjId))
+                continue;
+
             ObjectRenderData? renderData = _meshAdapter.TryGetRenderData(meshRef.GfxObjId);
             if (renderData is null)
             {
@@ -246,6 +249,9 @@ public sealed partial class WbDrawDispatcher
                 for (int setupPartIndex = 0; setupPartIndex < renderData.SetupParts.Count; setupPartIndex++)
                 {
                     (ulong gfxObjId, Matrix4x4 partTransform) = renderData.SetupParts[setupPartIndex];
+                    if (_meshAdapter.IsRuntimeHiddenMarker((uint)gfxObjId))
+                        continue;
+
                     ObjectRenderData? partData = _meshAdapter.TryGetRenderData(gfxObjId);
                     if (partData is null)
                     {

src/AcDream.App/Rendering/Wb/WbDrawDispatcher.cs

@@ -3314,6 +3314,9 @@ public sealed partial class WbDrawDispatcher : IDisposable
         // a non-Setup single-mesh entity (see the flat MeshRef call site).
         bool? entityHasCutoutSubsetOverride = null)
     {
+        if (_meshAdapter.IsRuntimeHiddenMarker(meshRef.GfxObjId))
+            return true;
+
         bool entityHasCutoutSubset = entityHasCutoutSubsetOverride ?? renderData.HasCutoutSubset;
         bool allTexturesReady = true;
         for (int batchIdx = 0; batchIdx < renderData.Batches.Count; batchIdx++)

src/AcDream.App/Rendering/Wb/WbMeshAdapter.cs

@@ -49,6 +49,7 @@ public sealed class WbMeshAdapter
     private readonly IMeshPipelineDevice? _graphicsDevice;
     private readonly ObjectMeshManager? _meshManager;
     private readonly AcDream.App.Rendering.IGpuResourceRetirementQueue? _resourceRetirement;
+    private readonly Func<uint, bool> _runtimeHiddenMarker;
     private readonly IPreparedAssetSource? _ownedPreparedAssets;
     private readonly MeshUploadFrameBudget _ordinaryUploadBudget =
         CreateUploadBudget(MaximumUploadsPerFrame);
@@ -83,6 +84,15 @@ public sealed class WbMeshAdapter
     internal (int Count, long Bytes) CpuMeshCacheDiagnostics =>
         _meshManager?.CpuCacheDiagnostics ?? default;
 
+    /// <summary>
+    /// Retail's statically decidable degrade-to-nothing admission. Marker
+    /// meshes whose only real level ends at distance zero never reach a draw
+    /// at runtime; the walk classifier and shadow caster share this exact
+    /// memoized predicate.
+    /// </summary>
+    internal bool IsRuntimeHiddenMarker(uint gfxObjId) =>
+        _runtimeHiddenMarker(gfxObjId);
+
     internal void SetDestinationRevealUploadPriority(bool enabled) =>
         _destinationRevealUploadPriority = enabled;
 
@@ -182,6 +192,15 @@ public sealed class WbMeshAdapter
         ArgumentNullException.ThrowIfNull(budgets);
 
         _resourceRetirement = resourceRetirement;
+        var hiddenMarkerMemo =
+            new System.Collections.Concurrent.ConcurrentDictionary<uint, bool>();
+        _runtimeHiddenMarker = gfxObjId =>
+            hiddenMarkerMemo.GetOrAdd(
+                gfxObjId,
+                static (id, source) =>
+                    AcDream.Core.Meshing.GfxObjDegradeResolver
+                        .IsRuntimeHiddenMarker(source, id),
+                dats);
         var resources = new AcDream.App.Rendering.ResourceCleanupGroup();
         IMeshPipelineDevice? graphicsDevice = null;
         IPreparedAssetSource? resolvedPreparedAssets = preparedAssets;
@@ -295,6 +314,7 @@ public sealed class WbMeshAdapter
         // Uninitialized constructor — only for tests / flag-off cases where
         // the caller wants a Dispose-safe no-op instance.
         _isUninitialized = true;
+        _runtimeHiddenMarker = static _ => false;
     }
 
     /// <summary>Test/init helper — produces a Dispose-safe instance with no