feat(render) Campaign FW3.2b-2 step 1b: walk registry plumbing to the renderer

LandblockPresentationPipeline exposes its render publisher;
FrameRootComposition hands the publisher's WalkBuildings/WalkLandscape
registries (FW3.1, published/retired per landblock) into
RetailPViewRenderer via two additive constructor parameters. Nothing
reads them yet - the static cutover flip is the next commit, executing
the plan section FW3.2b-2 design with the carve points now surveyed:
the EARLY per-slice sky/terrain/static loop, the look-in barrier +
DrawBuildingLookIns, the LATE dynamics phase, and the shells/cell-
statics passes.

Suites: full Release build 0 warnings; hermetic 6,753/0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Composition/FrameRootComposition.cs

@@ -512,7 +512,12 @@ internal sealed class FrameRootCompositionPhase
                 new WorldScenePViewRenderer(
                     new RetailPViewRenderer(
                         currentRenderSceneOracle,
-                        renderFrameProduct),
+                        renderFrameProduct,
+                        // Campaign FW3.2b-2: the walk's production world
+                        // data, published/retired with each landblock by the
+                        // render publisher (FW3.1).
+                        live.LandblockPipeline.RenderPublisher?.WalkBuildings,
+                        live.LandblockPipeline.RenderPublisher?.WalkLandscape),
                     retailPViewPassExecutor,
                     retailPViewPassExecutor),
                 retailPViewCells,

src/AcDream.App/Rendering/RetailPViewRenderer.cs

@@ -93,10 +93,21 @@ public sealed class RetailPViewRenderer
     {
     }
 
+    // Campaign FW3.2b-2: the walk's production world-data registries
+    // (published/retired by LandblockRenderPublisher) plus the per-frame
+    // driver state. Null until the composition passes them; the static
+    // cutover requires both.
+    private readonly Walk.WalkBuildingRegistry? _walkBuildings;
+    private readonly Walk.WalkLandscapeAssembler? _walkLandscape;
+
     internal RetailPViewRenderer(
         InteriorEntityPartition.IObserver? partitionObserver,
-        RenderScenePViewFrameProductController? sceneFrameProduct = null)
+        RenderScenePViewFrameProductController? sceneFrameProduct = null,
+        Walk.WalkBuildingRegistry? walkBuildings = null,
+        Walk.WalkLandscapeAssembler? walkLandscape = null)
     {
+        _walkBuildings = walkBuildings;
+        _walkLandscape = walkLandscape;
         _partitionObserver = partitionObserver;
         _candidateObserver = partitionObserver as ICurrentRenderPViewObserver;
         _sceneFrameProduct = sceneFrameProduct;

src/AcDream.App/Streaming/LandblockPresentationPipeline.cs

@@ -76,6 +76,11 @@ public sealed class LandblockPresentationPipeline
     private readonly Action<LandblockBuild, LandblockMeshData>?
         _publishBeforeSpatialCommit;
     private readonly LandblockRenderPublisher? _renderPublisher;
+
+    /// <summary>Campaign FW3.2b-2: the render publisher, exposed so the
+    /// frame composition can hand its walk world-data registries
+    /// (<c>WalkBuildings</c>/<c>WalkLandscape</c>) to the PView renderer.</summary>
+    internal LandblockRenderPublisher? RenderPublisher => _renderPublisher;
     private readonly LandblockPhysicsPublisher? _physicsPublisher;
     private readonly LandblockStaticPresentationPublisher? _staticPublisher;
     private readonly GpuWorldState _state;