[PascalNun]

What changes

Sources that provide an API landing page, split features into pages, or publish direct files/terrain ATOM feeds previously needed manual work or could stop at one page. This adds the five highest-priority items from the compatibility audit through the existing components:

• Follow supported WFS/OGC API pagination with deliberate caps, deduplication and explicit completeness/failure diagnostics; retain raw GML for buildings.
• Discover OGC API collections from root/metadata links and expose them through the existing layer list and vector loader.
• Load validated direct GeoJSON/Shapefile ZIPs and CityJSON/CityGML building downloads with bounded caching and archive checks.
• Load terrain ATOM tiles into an aligned, cropped raster mosaic, preserving NoData and the shared elevation baseline.
• Read ATOM/API reference metadata to orient Spatial Context, retaining saved-selection priority.

Also fixes projected Shapefile WKT authority selection, which could previously take a nested datum/ellipsoid EPSG code. The audit, implementation plan, exact source URLs, bounds and copyable example recipes are saved in the repository.

Validation

• Release solution build: zero warnings/errors.
• All seven deterministic suites passed, including 26 new source-compatibility checks; the new suite is included in CI.
• Manifest JSON, unique source ids, diff whitespace, component GUIDs and parameter names/order checked against 0.4.0.
• Live probes: 16 API collections; five unique lakes across five capped pages; Berlin DGM1 single-tile 400 x 400 and two-tile 200 x 200 Core meshes; Natural Earth GeoJSON (177 features) and Shapefile ZIP (three sample features); cjio Delft CityJSON (160 buildings).
• Older Delft-hosted CityJSON failed TLS from this machine; a maintainer fixture supplied a verified alternative. Certificate validation was retained.

New interactive Rhino/Grasshopper visual checks and Windows runtime validation remain pending on the manual checklist. In particular, headless probes do not prove preview/Brep quality, responsive native UI, saved-definition behavior or cross-layer XY/Z alignment. This PR stays draft pending that validation.

Compatibility

Component identities, parameter names/order and normal connections are retained; Layer becomes optional for files and a sole API collection. Shared localization and elevation rules remain in use. No new package dependencies, Google extraction/export/key persistence, version bump, public release, installed-plugin replacement or Food4Rhino/Package Manager changes are included. The installed/public version remains 0.4.0.

Links: plan, examples, manual validation.