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osm_vector.py --dem adds contours from the Terrain Tiles on AWS Open Data (SRTM, ~25 m; tools/maps/dem.py, standard library only: PNG decode, smoothing, marching squares, line joining). Every 100 m from zoom 12, every 20 m from zoom 15; the credit names the elevation source. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>