PortalJS — Add Geo

Overview

Turn one geospatial upload into a dual-tier PortalJS dataset entirely on the user's machine — no server-side container compute, keeping the zero-backend bet end-to-end. From a single source the skill derives two serverless tiers plus the preserved original:

• PMTiles (render tier) — a vector-tile archive <MapPreview> renders with MapLibre GL over HTTP range requests; any dataset size pans and zooms with no tile server.
• GeoParquet (query tier) — a GeoParquet 1.1 file (covering bbox column, Hilbert-sorted) <GeoQuery> runs spatial SQL over in place via DuckDB-Wasm.
• Original — the untouched upload in its native CRS, kept downloadable.

All three land on Cloudflare R2 (Git LFS → Giftless), and the skill appends one datasets.json entry whose resources[] match the shape the showcase auto-renders (the @reference/world-boundaries demo, PR #1647): pmtiles → <MapPreview>, geoparquet → <GeoQuery>, original → download. No page edits are needed. It automates the manual tippecanoe/duckdb recipes in the template README.