Natural Earth physical regions pack

Offline named-region polygons for the voice-annotation resolver (src/data/naturalEarthRegions.js) — "outline the Alps" resolves to the real range geometry with no network dependency.

Source: Natural Earth 10m physical vectors, via the canonical nvkelso/natural-earth-vector GitHub repo, commit ca96624a56bd078437bca8184e78163e5039ad19 (fetched 2026-07-28T01:36:39Z — exact provenance is in each file's meta header).

License: public domain (https://www.naturalearthdata.com/about/terms-of-use/). No attribution legally required; we credit "Made with Natural Earth" anyway. See DATA_SOURCES.md.

Curation (script not committed — parameters recorded in meta.curation):

• Named features only; the Dragons-be-here joke feature ("Null Island") dropped.
• Outer rings only (holes are irrelevant at country-scale outline zoom).
• Douglas-Peucker simplification at 0.01°, coordinates rounded to 3 decimals (~110 m), rings stored open (no closing duplicate vertex).
• MultiPolygon crumbs under 20 km² dropped (largest part always kept); rings that survive with fewer than 8 distinct vertices are midpoint-densified (shape-identical) so every ring has ≥8 vertices.
• Zero-area sliver artifacts dropped. Two marine features are ONLY slivers in the source and are therefore absent: Drake Passage and Luzon Strait.
• Result: 7.3 MB source → 2.5 MB pack (budget ≤3 MB, enforced by src/data/naturalEarthRegions.test.mjs).

Duplicate names exist upstream (two "Cordillera Oriental", a sliver + real "Canadian Shield", …); the lookup module resolves ties by largest area.