Ryan Malloy dcd75dad44 Fix polar projection bbox transform and image format auto-detection ...

- Add polar stereographic coordinate transform (EPSG:3413/3031) in geo.py
  so geographic bboxes are properly converted to projected meters
- Auto-detect image format: PNG for colormapped layers (preserves exact
  colors for query_point reverse-mapping), JPEG for true-color
- get_imagery format parameter now defaults to "auto" instead of "jpeg"
- Embed NDVI seasonal timelapse and polar stereo images in README
- 96 tests passing

2026-02-19 12:49:24 -07:00

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