feat(render #53): inject EntityClassificationCache into WbDrawDispatcher

Adds the cache as a constructor parameter on WbDrawDispatcher and a
private field on GameWindow. The cache is passed through but not yet
consumed by Draw — that wires up in Task 9 (cache miss / populate) and
Task 10 (cache hit / fast path).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -159,6 +159,17 @@ public sealed class GameWindow : IDisposable
     /// </summary>
     private readonly Dictionary<uint, AnimatedEntity> _animatedEntities = new();
 
+    /// <summary>
+    /// Tier 1 cache (#53): per-entity classification results for static
+    /// entities (those NOT in <see cref="_animatedEntities"/>). Conceptually
+    /// paired with <see cref="_animatedEntities"/> — that dictionary is the
+    /// gating predicate, this cache is the lookup that depends on it.
+    /// Passed to <see cref="AcDream.App.Rendering.Wb.WbDrawDispatcher"/> at
+    /// construction time. Tasks 9-10 of the cache plan wire the per-entity
+    /// miss-populate / hit-fast-path through the dispatcher's loop.
+    /// </summary>
+    private readonly AcDream.App.Rendering.Wb.EntityClassificationCache _classificationCache = new();
+
     private sealed class AnimatedEntity
     {
         public required AcDream.Core.World.WorldEntity Entity;
@@ -1604,7 +1615,8 @@ public sealed class GameWindow : IDisposable
             _worldState = new AcDream.App.Streaming.GpuWorldState(wbSpawnAdapter, wbEntitySpawnAdapter);
 
             _wbDrawDispatcher = new AcDream.App.Rendering.Wb.WbDrawDispatcher(
-                _gl, _meshShader!, _textureCache!, _wbMeshAdapter!, _wbEntitySpawnAdapter, _bindlessSupport!);
+                _gl, _meshShader!, _textureCache!, _wbMeshAdapter!, _wbEntitySpawnAdapter, _bindlessSupport!,
+                _classificationCache);
             // A.5 T22.5: apply A2C gate from quality preset.
             _wbDrawDispatcher.AlphaToCoverage = _resolvedQuality.AlphaToCoverage;
         }

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

@@ -68,6 +68,12 @@ public sealed unsafe class WbDrawDispatcher : IDisposable
 
     private readonly BindlessSupport _bindless;
 
+    // Tier 1 cache (#53): per-entity classification results for static
+    // entities (those NOT in GameWindow._animatedEntities). Wired here in
+    // Task 7 for plumbing only — Tasks 9-10 wire the per-entity
+    // miss-populate / hit-fast-path through the loop.
+    private readonly EntityClassificationCache _cache;
+
     /// <summary>
     /// A.5 T22.5: gate for GL_SAMPLE_ALPHA_TO_COVERAGE around the opaque pass.
     /// Default true matches T20 behavior. Set false for Low/Medium presets that
@@ -139,25 +145,32 @@ public sealed unsafe class WbDrawDispatcher : IDisposable
     private int _gpuSampleCursor;
     private bool _gpuQueriesInitialized;
 
-    public WbDrawDispatcher(
+    // Constructor accessibility is internal because EntityClassificationCache
+    // is internal — a public ctor with an internal-typed parameter would be
+    // an inconsistent-accessibility error. The dispatcher is constructed
+    // exclusively from GameWindow (same assembly), so internal is fine.
+    internal WbDrawDispatcher(
         GL gl,
         Shader shader,
         TextureCache textures,
         WbMeshAdapter meshAdapter,
         EntitySpawnAdapter entitySpawnAdapter,
-        BindlessSupport bindless)
+        BindlessSupport bindless,
+        EntityClassificationCache classificationCache)
     {
         ArgumentNullException.ThrowIfNull(gl);
         ArgumentNullException.ThrowIfNull(shader);
         ArgumentNullException.ThrowIfNull(textures);
         ArgumentNullException.ThrowIfNull(meshAdapter);
         ArgumentNullException.ThrowIfNull(entitySpawnAdapter);
+        ArgumentNullException.ThrowIfNull(classificationCache);
 
         _gl = gl;
         _shader = shader;
         _textures = textures;
         _meshAdapter = meshAdapter;
         _entitySpawnAdapter = entitySpawnAdapter;
+        _cache = classificationCache;
 
         _bindless = bindless ?? throw new ArgumentNullException(nameof(bindless));
         _instanceSsbo   = _gl.GenBuffer();