feat(layers): GNSS interference layer from ADS-B NIC/NACp integrity

Bins airborne ADS-B v1/v2 aircraft that report degraded navigation
integrity (NIC < 7, NACp < 8, or readsb's GPS-loss flag) into 0.5 degree
cells over a rolling 30-minute window, coloured with the gpsjam.org
bands. Keyless: reads the capped adsb.lol point snapshot around the view
through /api/gnss-integrity, which returns integrity fields only, caches
60 s per whole-degree anchor, backs off on upstream 429 and serves the
last snapshot on failure. Adds scripts/qa-gnss.mjs.

Built by the Hex project (Crew Leo Agile dev team).

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

src/app/layers/gnss.js

@@ -0,0 +1,12 @@
+import {
+  createAdsbGnssSource,
+  createGnssInterferenceLayer,
+} from '../../layers/gnss/index.js';
+
+/** Wire the adsb.lol GNSS interference layer into the application catalog. */
+export function createApplicationGnssInterference(options = {}) {
+  return createGnssInterferenceLayer({
+    source: createAdsbGnssSource(),
+    ...options,
+  });
+}