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New xrspatial.sky_view_factor module with all four backends: NumPy (@ngjit), CuPy (@cuda.jit), Dask+NumPy, and Dask+CuPy.
25 tests covering correctness, NaN handling, range validation, cross-backend equivalence (NumPy/Dask/CuPy/Dask+CuPy), and Dataset support. Edge cells now compute with truncated rays instead of returning NaN, keeping numpy and dask paths consistent.
- Add Sky-View Factor entry to docs/source/reference/surface.rst - Add examples/user_guide/22_Sky_View_Factor.ipynb with parameter exploration and hillshade comparison
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