docs: credit and document the Spanish city bike systems

- dataCredits `gbfs`: names the seven PBSC operators, with BiciMAD's
  required "Powered by EMT de Madrid" linking to emtmadrid.es.
- dataCredits `jcdecaux-gbfs`: adds Valenbisi and Sevici.
- DATA_SOURCES.md: a BiciMAD row (Madrid's open-data catalogue publishes
  the feed under EMT's terms, attribution required), one row for the other
  six PBSC feeds (no licence published; attribution to the operator), and
  the JCDecaux row widened to Valencia and Seville.
- CURRENT-STATE.md: the Bikeshare row, and the underscore and
  geofenced-capacity rules in "GBFS upstream bounds".

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/CURRENT-STATE.md

@@ -1270,7 +1270,13 @@ String arrays regardless of the reported feed version. Nonempty English text
 (including regional `en-*` tags, case-insensitive) takes precedence, then the first
 usable translation. An unusable `name` falls back to `short_name` with the same
 rules; if neither supplies text, the station remains available with an empty name
-(the globe uses its station-ID label and the tool returns `null`). Malformed
+(the globe uses its station-ID label and the tool returns `null`). A run of underscores,
+with the spaces around it, reads as one word break and the ends are trimmed:
+JCDecaux's Spanish contracts publish `_PLAZA_MUSICO_LOPEZ_CHAVARRI`. Other spacing
+stays as published. Capacity counts docks: PBSC adds the bikes a station accepts
+in its geofenced area to `capacity` and reports that part as `geofenced_capacity`
+(Bilbao Bizi: 839 = 39 docks + 800), so the layer, its colour ratio and
+`get_bike_share` read `capacity − geofenced_capacity` when the extension is present. Malformed
 translation entries do not interrupt loading of the other stations. This covers
 station names, not complete GBFS v3 support.
 `scripts/qa-gbfs-names.mjs` checks synthetic localized names through the real layer,
@@ -3392,7 +3398,7 @@ its criteria cannot be silently ignored.
 | CCTV                   | Austin + Caltrans (CA) + TfL London + Ontario 511 + Fintraffic (FI) + DriveBC (BC) + TxDOT (TX) + Estonia (Tallinn, Tarktee) + Live Traffic NSW + Open Calgary Open Data + Statens vegvesen (NO, stills + live HLS) + King County (WA) Open Data + WSDOT (WA) Open Data + NYC DOT TMC (opt-in) + City of Toronto RESCU + Catalonia (Servei Català de Trànsit) + Street View fallback | `src/data/cctv.js`                                    | `/api/cctv`                                              | 10s (active)                                                                      |
 | Radio                  | Radio Browser (public-domain station directory)                                                                                                                                                 | `src/data/radio.js`                                   | `/api/radio/stations`, `/api/radio/click/:uuid`          | 45 min directory refresh                                                          |
 | Transit 🚌             | Operator GTFS-Realtime VehiclePositions (7 keyless regions, `src/data/transitFeeds.js`)                                                                                                         | `src/layers/transit/` via `src/app/layers/transit.js` | `/api/transit`                                           | 15s (poll + delayed playback)                                                     |
-| Bikeshare 🚲           | GBFS (Lyft + BCycle + Social Bicycles + PBSC incl. Bike Share Toronto, Bike Itaú (Brazil) and Bicing (Barcelona) + Urban Sharing, Entur, JCDecaux NO + nextbike (AMBici))                                                                                                                                        | `src/data/bikeshare.js`                               | `/api/gbfs`                                              | 60s                                                                               |
+| Bikeshare 🚲           | GBFS (Lyft + BCycle + Social Bicycles + PBSC incl. Bike Share Toronto, Bike Itaú (Brazil), Bicing (Barcelona) and seven other Spanish cities + Urban Sharing, Entur, JCDecaux (Lillestrøm, Valencia, Seville) + nextbike (AMBici))                                                                                                                                        | `src/data/bikeshare.js`                               | `/api/gbfs`                                              | 60s                                                                               |
 | Directions 🧭          | OSRM on FOSSGIS servers (OpenStreetMap)                                                                                                                                                         | `src/data/directions.js`                              | `/api/route` (`steps=1`)                                 | on placement / mode change                                                        |
 | Datacenters ▣          | OSM extract (bundled)                                                                                                                                                                           | `src/data/localLayers.js`                             | —                                                        | static                                                                            |
 | Dams ▰                 | OpenInfraMap/OSM extract (bundled)                                                                                                                                                              | `src/data/localLayers.js`                             | —                                                        | static                                                                            |