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Superseded by consolidated postal geocoding PR #124. This PR's head commit is retained in the combined branch. Combined CI passes on Node.js 24/26 and static checks.
Summary
Add Portugal postal coordinates for approximate delivery-to-return distance analysis.
Add 197,772 unique full postal codes from 206,942 GeoNames PT rows, retrieved 2026-11-04 (archive export 2026-11-04). Source: https://download.geonames.org/export/zip/PT.zip, CC BY 4.0; attribution and reproducible converter in docs/geocode-PRT.md. Average distinct coordinate pairs per code without weighting duplicate rows. These are estimated representative points, not postal centroids. Mainland, Madeira, and Azores are represented; national completeness is not established.
PRT accepts hyphenated, compact, and single-space-separated full codes. Return values retain legacy string coordinates in longitude/latitude order. Other countries keep their behavior.
Evidence
Merge Danger
Door: two-way
Blast Radius: PRT
No merge or deployment performed. Shared overlap: lib/geocode.js allowlist and country-specific normalization. Full postal codes often share locality coordinates; exact positional accuracy and national completeness were not independently audited. Data adds roughly 20 MB of JSON and lookup remains a linear scan.