test: port ACME ClientReference + conformance tests
Ports the decompiled AC client ground-truth oracle and exhaustive
conformance test suite from WorldBuilder-ACME-Edition into acdream's
test project.
ClientReference.cs: faithful C# port of CLandBlockStruct.cpp with
IsSWtoNECut, GetPalCode, GetVertexHeight, GetVertexPosition.
ClientConformanceTests.cs verifies acdream's implementations match:
- SplitDirection: 9 spot-checks + 25,600-cell full sweep (0 mismatches)
- PalCode: 5 spot-checks + 256 exhaustive roads + 1M exhaustive types
- Height sampling: flat terrain exact match, vertex corners match,
interpolated points in-range
- TerrainSurface.SampleZ agrees with TerrainBlending split direction
- Constants match (CellSize=24, CellsPerBlock=8, BlockLength=192)
27 new tests. 310 total (201 core + 109 net), all green.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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