docs(street-level): README, DATA_SOURCES, CURRENT-STATE, SECURITY, CHANGELOG

Describe the provider-neutral layer, the PROVIDERS chip row, the shared
filter and its share-link options, and how a new provider registers.
Drop every mention of the removed plain-English query and Anthropic key.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

DATA_SOURCES.md

@@ -21,8 +21,7 @@ How to read this:
 | **NOAA nowCOAST lightning density** (`nowcoast.noaa.gov/geoserver/observations/lightning_detection/ows`) | Lightning density: 15-minute accumulated strike density on an approximately 8 km grid, Americas and Pacific. Keyless; layer metadata refreshed every 10 minutes, exact-time images cached for up to 24 hours | NOAA Level-5 derived product from Vaisala NLDN/GLD360; the [product description](https://ocean.weather.gov/lightning/lightning_pdd.php) permits public distribution of this density product, not of raw Vaisala detections | "NOAA/NWS nowCOAST; derived from Vaisala NLDN/GLD360" |
 | **NOAA NHC / CPHC advisories** (`www.nhc.noaa.gov/CurrentStorms.json` + the `mapservices.weather.noaa.gov` tropical weather summary MapServer) | Cyclone advisories: storm positions, forecast tracks, points and cones for the Atlantic and eastern/central North Pacific. Keyless through `/api/cyclones`; cached for 5 minutes | [NWS public-data terms](https://www.weather.gov/disclaimer); no endorsement implied | "NOAA/NWS NHC / CPHC" |
 | **OpenStreetMap ALPR camera locations** (including DeFlock community mapping) | Optional mapped automatic license-plate-reader camera layer | [ODbL 1.0](https://opendatacommons.org/licenses/odbl/1-0/); commercial use permitted with applicable attribution and database share-alike obligations | [© OpenStreetMap contributors](https://www.openstreetmap.org/copyright); [DeFlock](https://deflock.org) community mapping |
-| **Mapillary** (vector tiles, Graph API, MapillaryJS) | Street Level layer: coverage, image cones, embedded viewer, and the map features / traffic signs behind the plain-English query box | Imagery and derived data [CC BY-SA 4.0](https://www.mapillary.com/terms); API use under the Mapillary Platform Terms with a client token; tiles are cached locally for 24 h | "Imagery © Mapillary contributors, CC BY-SA 4.0" — shown on the globe while the layer is on, and by the embedded viewer's attribution component |
-| **mapillary_sprite_source** (icons) | Map-feature icons on the globe | [MIT](https://github.com/mapillary/mapillary_sprite_source/blob/master/LICENSE) | Copyright (c) 2015 mapillary |
+| **Mapillary** (vector tiles, Graph API, MapillaryJS) | Street Level layer, Mapillary provider: coverage lines, image cones and the embedded viewer | Imagery and derived data [CC BY-SA 4.0](https://www.mapillary.com/terms); API use under the Mapillary Platform Terms with a client token; coverage tiles are cached locally for 24 h | "Street Level: imagery © Mapillary contributors, CC BY-SA 4.0" — shown on the globe while the provider is on, and by the embedded viewer's attribution component |
 | **Google Map Tiles API** (Photorealistic 3D Tiles) + Places/Geocoding | The 3D globe, voice scene context, and on-demand nearby installation search                                                         | Google Maps Platform ToS (proprietary, your own key + billing)                                                                                                                                                                                                                                                                                        | "Google" / "Google Maps" logo — **shown in-app**, required                                                                                  |
 | **OpenSky Network**                                                   | Primary worldwide live-flight snapshot                                                                                              | Non-commercial research/education license                                                                                                                                                                                                                                                                                                             | Schäfer et al., _"Bringing Up OpenSky"_, IPSN 2014 + opensky-network.org                                                                    |
 | **adsb.lol point API**                                                | Bounded live-flight fallback when OpenSky has no usable snapshot                                                                    | ODbL 1.0                                                                                                                                                                                                                                                                                                                                              | adsb.lol contributors; `api.adsb.lol/v2/lat/{lat}/lon/{lon}/dist/{radius}`                                                                  |