fix(rendering): carry retail SetSurface state to detail draws

Resolve exact SetSurface blend, alpha-test, and fog state once during extraction and preserve it through recipe-10 prepared payloads, Wb/EnvCell command data, Vulkan pipelines, push constants, and both ordinary/atmospheric one-pass shaders. Preserve AP-240 Wb pure-Clip immediate opaque/A2C while EnvCell uses retail premultiplied Clip; detail-off routing remains unchanged. Correct AP-232 and register the remaining detail-off state divergence.

Mutation first failures (all restored):
- raw Add->SRCALPHA/ONE: WalkStaticStreamPopulatorTests.ImmediateBuildingDetail_UsesExactResolvedSetSurfaceState line 1278, expected wb-mesh-raw-additive-1x.
- inverse-add->alpha-add: same test line 1278, expected wb-mesh-inverse-additive-1x.
- remove Env inverse: EnvCellAlphaDrawSourceTests.DetailOn_EveryEnvCellFamilyDrawsOnceInPlaceWithAuthoredOpacity line 132, expected envcell-inverse.
- raw IsAdditive precedence: same test line 132, Translucent|Clip|Additive expected envcell-alpha.
- Wb paletted ParamB=0: OrderPreservingSubmitterTests line 333, expected 0.392156869.
- Wb DDS ParamB=0.05: same test line 333, expected 0.784313738.
- disable Alpha+Clip test: WalkStaticStreamPopulatorTests line 1286, expected 0.784313738.
- always fog raw Add: same test line 1287, expected no-fog true.
- disable fog non-Add: same test line 1287, expected no-fog false.
- X=a*qA: RetailDetailTextureContractTests line 261, shared squared-alpha substring absent.
- X includes base alpha: same test line 262, forbidden baseTexel.a present.
- CLIP uses 0.05: EnvCellAlphaDrawSourceTests.ClipShaders_UseGreaterEqualForThePerRangeReference line 367.
- second detail draw: EnvCell detail-on line 131, collection contained 2 draws.
- straight-alpha substitute: Wb immediate line 1278, expected wb-mesh-additive-1x.
- omit ordered detail arm: OrderPreservingSubmitterTests line 318, expected (77,3.5), got (0,0).
- omit atmospheric combine: RetailDetailTextureContractTests line 260, shared include absent.
- drop serialized opacity: ObjectMeshDataSerializerTests line 292, expected opacity bits, got 1.0.
- stale detail arm: atmospheric adjacency line 402, expected slot 0, got 77.
- per-frame surface map: EnvCell warmed allocation line 285, expected 0 B, got 204800 B.

tests/AcDream.Content.Tests/ObjectMeshDataSerializerTests.cs

@@ -192,6 +192,10 @@ public class ObjectMeshDataSerializerTests {
                 Indices = new List<ushort> { 0, 1, 2 },
                 CullMode = CullMode.Clockwise,
                 Translucency = TranslucencyKind.Opaque,
+                MaterialState = new RetailSetSurfaceMaterialState(
+                    RetailSetSurfaceBlend.InverseAdditive,
+                    RetailSetSurfaceAlphaTest.Paletted,
+                    FogEnabled: false),
                 IsTransparent = false,
                 IsAdditive = false,
                 HasWrappingUVs = false,
@@ -290,6 +294,37 @@ public class ObjectMeshDataSerializerTests {
             BitConverter.SingleToInt32Bits(read.SurfaceOpacity));
     }
 
+    [Theory]
+    [InlineData(0, 0, true)]
+    [InlineData(1, 0, true)]
+    [InlineData(2, 1, true)]
+    [InlineData(3, 2, false)]
+    [InlineData(4, 0, true)]
+    [InlineData(5, 1, false)]
+    [InlineData(6, 2, true)]
+    public void SetSurfaceState_RoundTripsEveryPackedFieldDeterministically(
+        int blendValue,
+        int alphaTestValue,
+        bool fogEnabled) {
+        ObjectMeshData data = WithCellShellSubset();
+        TextureBatchData batch = Assert.Single(Assert.Single(data.TextureBatches).Value);
+        batch.MaterialState = new RetailSetSurfaceMaterialState(
+            (RetailSetSurfaceBlend)blendValue,
+            (RetailSetSurfaceAlphaTest)alphaTestValue,
+            fogEnabled);
+
+        using var first = new MemoryStream();
+        ObjectMeshDataSerializer.Write(data, first);
+        using var second = new MemoryStream();
+        ObjectMeshDataSerializer.Write(data, second);
+
+        Assert.Equal(first.ToArray(), second.ToArray());
+        TextureBatchData read = Assert.Single(Assert.Single(
+            ObjectMeshDataSerializer.Read(first.ToArray()).TextureBatches).Value);
+        Assert.Equal(batch.MaterialState, read.MaterialState);
+        Assert.Equal(batch.MaterialState.ToPackedByte(), read.MaterialState.ToPackedByte());
+    }
+
     // ---- determinism -----------------------------------------------------
 
     [Fact]