ucam-eo/geotessera ? reverse-engineered prompt

Build me a Python package called GeoTessera that helps people find and download Tessera geospatial embeddings for a place and year.

I want a simple command line tool and a small Python API. The main things should be: check what data is available with a coverage map, download embeddings for a bounding box or a region file, and save them either as raw NumPy arrays or georeferenced GeoTIFFs. It should work with the precomputed tiles in the public storage, cache the manifest locally, and avoid downloading the same files again if they already exist.

The embeddings are on a 0.1 degree grid, so please handle tile lookup, dequantization from the quantized arrays plus scale files, and basic metadata for each download. If a user asks for GeoTIFF output, include the geospatial transform and landmask information. Also add a few examples and enough tests so the basic download and export flow is reliable.

If you need current library details, look up the latest docs online and match the existing project layout.