Add scalar diffusion solver#944
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New `diffuse()` function that runs explicit forward-Euler diffusion on a 2D raster. Supports uniform or spatially varying diffusivity, auto CFL time step, and all four backends (numpy, cupy, dask+numpy, dask+cupy).
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Summary
diffuse()function: forward-Euler solver for the 2D diffusion equation (5-point Laplacian stencil)@ngjit), cupy (@cuda.jit), dask+numpy, dask+cupy viamap_overlapChanges
xrspatial/diffusion.py-- new modulexrspatial/tests/test_diffusion.py-- 15 tests (correctness, conservation, NaN handling, dask parity, input validation)xrspatial/__init__.py-- re-exportdiffusexrspatial/accessor.py--.xrs.diffuse()on DataArray and Datasetdocs/source/reference/diffusion.rst-- API docsdocs/source/reference/index.rst-- toctree entryREADME.md-- feature matrix rowexamples/user_guide/16_Diffusion.ipynb-- user guide notebookTest plan
pytest xrspatial/tests/test_diffusion.pypasses (15/15)Closes #940