Fix LOD terrain tile boundary seam artifact - #83
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Extend tile extraction by one pixel so adjacent tiles share boundary vertices. Previously each tile covered [r0, r0+tile_size) exclusively, leaving a one-pixel gap where no geometry existed, producing visible seam lines in shaded terrain.
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Closes #79
Summary
terrain[r0:r0+tile_size]), leaving a one-pixel gap between adjacent tiles where no geometry existed. This gap showed up as visible seam lines in the shading.r0+tile_size+1) so adjacent tiles share their boundary row/column. The shared vertices make the surface continuous.Test plan
pytest rtxpy/tests/test_lod.py— 30/30 pass