fix(rendering): port retail shared alpha list

Queue translucent world GfxObj batches and scene particles in one stable far-to-near stream using transformed DAT sort centers, then drain it at retail's landscape and final-world boundaries. Preserve authored blend, cull, lighting, opacity, and adjacent-only batching so particles behind lifestones are composited through the crystal instead of overpainting it.

Release build succeeds and all 5,914 tests pass with five intentional skips.

Co-authored-by: OpenAI Codex <codex@openai.com>

src/AcDream.App/Rendering/RetailPViewRenderer.cs

@@ -539,6 +539,11 @@ public sealed class RetailPViewRenderer
         if (!ctx.RootCell.IsOutdoorNode)
             ctx.DrawUnattachedSceneParticles?.Invoke();
 
+        // Retail PView::DrawCells 0x005A4872 drains the landscape alpha list
+        // immediately after LScape::draw and before the optional depth clear.
+        // The queue remains active for the post-clear/final-world scope.
+        ctx.FlushLandscapeAlpha?.Invoke();
+
         // T1: retail clears the FULL depth buffer ONCE between the outside
         // stage and the interior stage (PView::DrawCells, Ghidra 0x005a4840 —
         // Clear gated on portalsDrawnCount; exact gate semantics is a plan
@@ -1105,6 +1110,10 @@ public sealed class RetailPViewDrawContext : IRetailPViewCellDrawContext
     /// end of the landscape stage (pre-clear). Outdoor roots draw them via
     /// GameWindow's dedicated post-frame pass instead.</summary>
     public Action? DrawUnattachedSceneParticles { get; init; }
+    /// <summary>Drains retail's delayed landscape alpha list before the
+    /// optional outside-to-inside depth clear. The same frame-scoped queue
+    /// remains open for the final world alpha scope.</summary>
+    public Action? FlushLandscapeAlpha { get; init; }
     public Action<IReadOnlyList<WorldEntity>>? DrawDynamicsParticles { get; init; }
     public Action<RetailPViewFrameResult>? EmitDiagnostics { get; init; }
 }