ncarnate 2.0.3

Read the Docs site shipped in-tag (fixes RTD's tag-based "stable" build), Markdown README with DOI badge and Documentation URL on PyPI, and fixes adopted from an independent multi-model review: geolocation fill-value guard (interpolation-scoped, NaN-aware), a warning when swath axes are non-leading, accurate CLI --help, and a single StructMetadata parse per file.

Full details: CHANGELOG.md