Add polygonize benchmark comparing xrspatial vs rasterio#1007
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Standalone benchmark script that compares xrspatial polygonize (numpy and cupy backends) against rasterio.features.shapes across 5 raster patterns (few large regions, many small regions, checkerboard, concentric rings, masked blobs) at 4 resolutions. Outputs timing tables, consistency checks (polygon count and area agreement), and a markdown report.
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Closes #1006
Summary
benchmarks/benchmark_polygonize.py, a standalone comparison of xrspatial polygonize againstrasterio.features.shapes(GDAL)benchmarks/POLYGONIZE_BENCHMARKS.mdwith timing tables, ratios, and consistency resultsrasterizer_benchmarks.pyInitial results: xrspatial-numpy is faster than rasterio in all 20 configurations. Consistency is 100% (identical polygon counts and areas).
Test plan
python benchmarks/benchmark_polygonize.pyend to end