Remove Data Library entries whose licence or provider links are broken

A link check of every manifest found 404 licence or provider pages for
OpenSeaMap seamarks, EMODnet bathymetry and the PDOK, basemap.at, Geneva
SITG, ICGC Catalunya, Luxembourg and Vlaanderen aerial photos, and no
answer from the SEDAC GPW, Minnesota and Bangor hosts. Drop those 11
entries, renumber the unpublished share-token ledger, point the tests at
remaining entries and regenerate DATA_SOURCES.md.

docs/CURRENT-STATE.md

@@ -441,29 +441,28 @@ critical #d03b3b); categorical ones (fuel, EONET category, building
 occupancy) use at most four hues that pass all-pairs colour-vision checks on
 the dark globe, plus a neutral Other. Tile layers carry a static
 `display.legend` copied from the provider's own scale (GBIF classic.poly,
-JRC occurrence, GIBS GPW, Macrostrat's ICS period colours); EMODnet publishes
-no machine-readable scale and has none. Aerial photo layers (PDOK, IGN, GSI
+JRC occurrence, Macrostrat's ICS period colours). Aerial photo layers (IGN, GSI
 photos, swisstopo SWISSIMAGE) set `display.outline`: their covered countries'
 borders draw as a thin white ground-clamped line, so the imagery's edge is
 plain, with a "Coverage outline" legend item. Borders come from Natural
 Earth's 1:50m admin-0 countries (public domain, fetched live once per page and
 credited); `countries` draws every part (Japan's islands, Liechtenstein beside
-Switzerland), `coverage` only the parts inside `coverage.bbox` (the European
-Netherlands, metropolitan France). A failed border fetch costs only the
+Switzerland), `coverage` only the parts inside `coverage.bbox` (metropolitan
+France). A failed border fetch costs only the
 outline. The same layers set `display.aerial`: they drape above every other
 imagery layer and raise themselves again whenever another drape is added, so a
 basemap or weather overlay switched on later goes underneath. Each is
 `source.bounded` (tiles requested inside `coverage.bbox` only) and names its
 provider's no-imagery fill in `display.noDataColor`, drawn transparent through
-Cesium's colour-to-alpha (max channel distance 0.02): measured fills are PDOK
-and swisstopo white, IGN's flat ocean blue (#0a3b59) and GSI's ocean grey
-(#343434). Without both, PDOK's white fill covered the whole globe. A 4xx tile
+Cesium's colour-to-alpha (max channel distance 0.02): measured fills are
+swisstopo white, IGN's flat ocean blue (#0a3b59) and GSI's ocean grey
+(#343434). Without both, a white fill covered the whole globe. A 4xx tile
 answer counts as "no imagery here", never as a tile error. IGN's overseas
-departments are outside its single bbox and are not shown. The aerial set now holds 68
-entries: 64 imported from the Open Imagery Register (national programmes in
-Austria, Belgium, Germany, Estonia, Spain, Luxembourg, Poland, Portugal,
-Geneva, Australia's NSW, and 51 US services: NAIP plus state, county and
-city programmes) plus PDOK, IGN, GSI and SWISSIMAGE, each with an `imagery`
+departments are outside its single bbox and are not shown. The aerial set now holds 60
+entries: 57 imported from the Open Imagery Register (national programmes in
+Belgium (Wallonia), Germany, Estonia, Spain, Poland, Portugal, Australia's
+NSW, and 49 US services: NAIP plus state, county and city programmes) plus
+IGN, GSI and SWISSIMAGE, each with an `imagery`
 block (type, published resolution, true ortho, years flown, refresh) that
 Browse shows as a spec list. Tiles take `xyz` (with `{reverseY}` for TMS) or
 `bbox` templates (`{bbox-epsg-3857}`: WMS GetMap and ArcGIS export, filled
@@ -558,7 +557,7 @@ registered in the Data attribution popover while it is in use.
 Seeds: NASA EONET open events (GeoJSON, browser-direct), EIA US power plants
 ≥ 100 MW (ArcGIS, browser-direct, ranked by capacity), Smithsonian GVP Holocene
 volcanoes (WFS GeoJSON, proxied — the upstream sends no CORS headers), NASA
-Black Marble 2016 night lights and OpenSeaMap seamarks (tiles), and the NYC,
+Black Marble 2016 night lights (tiles), and the NYC,
 Lithuania and FL511 CCTV packs. Added from the Ask dataset registry (its live,
 mappable sources that are not core layers): the WRI Global Power Plant Database
 (provider-hosted CSV, the 10,000 largest of ~35,000 by capacity, so it reads
@@ -576,10 +575,12 @@ open/freemium registry review (commercial sources excluded): GDACS disaster
 alerts; the National Bridge Inventory (view-bounded, coloured Good/Fair/Poor);
 EPA Superfund sites and Toxics Release Inventory facilities (view-bounded); and
 tile overlays for Macrostrat geology, GBIF biodiversity density, USGS
-topographic and hydrography maps, PDOK (Netherlands) and IGN (France) aerial
-photos, BKG TopPlusOpen, GSI Japan map and photos, EMODnet bathymetry, SEDAC
-GPW 2020 population density (legend from the GIBS colour map) and JRC surface
-water occurrence. `npm run library:check` validates manifests,
+topographic and hydrography maps, IGN (France) aerial photos, BKG
+TopPlusOpen, GSI Japan map and photos and JRC surface water occurrence.
+Entries whose licence or provider pages no longer resolve (404 or unreachable
+host, checked 2026-11-12) were removed: OpenSeaMap seamarks, EMODnet
+bathymetry, SEDAC GPW population density, PDOK, basemap.at, Geneva SITG,
+ICGC Catalunya, Luxembourg, Vlaanderen, Minnesota and Bangor aerial photos. `npm run library:check` validates manifests,
 the ledger (append-only with `--base-ref`, run in CI on pull requests) and the
 generated DATA_SOURCES.md section; `npm run library:probe` hits every upstream
 once; `npm run qa:data-library` is the browser gate (fixture-backed).