feat(content): S1 exact CellStruct surface-index construction, recipe 8

Campaign OVERHAUL S1 chunk A. Retail's D3DPolyRender::ConstructMesh
@0x0059DFA0 is ported as one pure Core descriptor plus the Content
extraction that consumes it:

- side candidates come only from sides_type (0/1/2); NoPos/NoNeg mean
  UV-array absence only and never suppress a side (CPolygon::UnPack
  @0x00538650);
- ST_DOUBLE's second copy is reversed with a negative normal; ST_BOTH's
  negative side has a negative normal and forward fan order (reverse is on
  the copy ordinal, not the side ordinal);
- an absent UV-index array is UV index 0 (ConstructMesh @0x0059E691
  xor ebx,ebx, arbitrated on the PDB-paired binary); copyVert @0x0059C080
  zeroes coordinates only for a negative or out-of-range index or a vertex
  without UVs, never by clamping to slot 0;
- the subset owner is the source surface-array index, emitted in ascending
  slot order with retail's per-slot mask (2 > 8 > 4 precedence, positive
  surface OR on signed stippling > 0);
- built-EnvCell admission is (Surface.Type & (BASE1_IMAGE|BASE1_CLIPMAP))
  != 0 after surface resolution (DrawEnvCell @0x0059F170 -> DrawMesh
  @0x0059D4A0 arg4=1); untextured slots are constructed but not emitted;
- cell batches carry SourceSurfaceIndex, RetailSurfaceMask, RawSurfaceType,
  IsCellShell, and fixed clockwise raster cull (RenderMeshSubset
  @0x0059CA10); authored sides_type is no longer stored as GPU cull.

Prepared-mesh serializer gains the four fields; bake recipe 7 -> 8 with a
FullRebuild migration; pak format stays 2 (pinned). Ordinary GfxObj
extraction is unchanged. AP-234's register row and CellMesh unification
land in chunk B.

Core: 32 descriptor tests. Content: 170/170. Bake: 18/18. Launcher.Core:
365/365 (Lane!=Linux). Solution Release build 0 warnings / 0 errors.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/AcDream.Launcher.Core.Tests/Installation/ContentMigrationCatalogTests.cs

@@ -27,4 +27,30 @@ public sealed class ContentMigrationCatalogTests
         Assert.Contains("pak v2", plan.Reason, StringComparison.OrdinalIgnoreCase);
         Assert.Contains("DrawingBSP", plan.Reason, StringComparison.OrdinalIgnoreCase);
     }
+
+    [Fact]
+    public void RecipeSevenToEightRequiresOneExplicitFullRebuild()
+    {
+        // OH2/S1: exact CellStruct surface-index subset construction.
+        ContentMigrationPlan plan = ContentMigrationCatalog.Resolve(7, 8);
+
+        Assert.Equal(ContentWorkKind.FullRebuild, plan.Kind);
+        Assert.Equal(7u, plan.FromRecipeVersion);
+        Assert.Equal(8u, plan.TargetRecipeVersion);
+        Assert.Contains("CellStruct", plan.Reason, StringComparison.OrdinalIgnoreCase);
+        Assert.Empty(plan.EffectiveDatIds);
+        Assert.Empty(plan.EffectiveLandblocks);
+    }
+
+    [Fact]
+    public void AnyOlderRecipeToEightCollapsesToOneFullRebuild()
+    {
+        ContentMigrationPlan plan = ContentMigrationCatalog.Resolve(1, 8);
+
+        Assert.Equal(ContentWorkKind.FullRebuild, plan.Kind);
+        Assert.Equal(8u, plan.TargetRecipeVersion);
+        Assert.Contains("pak v2", plan.Reason, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("DrawingBSP", plan.Reason, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("CellStruct", plan.Reason, StringComparison.OrdinalIgnoreCase);
+    }
 }