fix(rendering): match empty packed submissions

The production dispatcher forces transparent deferral off when no top-level VAO was resolved, even if the frame alpha queue is active. Carry the same per-draw VAO sentinel into the compare-only packed classifier so its empty-submission state is exact rather than sampling only the later queue state.

tests/AcDream.App.Tests/Rendering/Wb/PackedDispatcherOracleTests.cs

@@ -0,0 +1,23 @@
+using AcDream.App.Rendering.Wb;
+
+namespace AcDream.App.Tests.Rendering.Wb;
+
+public sealed class PackedDispatcherOracleTests
+{
+    [Theory]
+    [InlineData(0u, false, false)]
+    [InlineData(0u, true, false)]
+    [InlineData(7u, false, false)]
+    [InlineData(7u, true, true)]
+    public void TransparentDeferral_MatchesProductionNoVaoEarlyReturn(
+        uint anyVao,
+        bool alphaQueueCollecting,
+        bool expected)
+    {
+        Assert.Equal(
+            expected,
+            WbDrawDispatcher.ShouldDeferPackedTransparent(
+                anyVao,
+                alphaQueueCollecting));
+    }
+}