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/constructCatalog.js

@@ -25,6 +25,7 @@ import { createApplicationAwareness } from './layers/militaryAwareness.js';
 import { createApplicationFirms } from './layers/firms.js';
 import { createApplicationEarthquakes } from './layers/earthquakes.js';
 import { createApplicationFirePerimeters } from './layers/perimeters.js';
+import { createApplicationGnssInterference } from './layers/gnss.js';
 import { createApplicationCables } from './layers/submarineCables.js';
 import { createApplicationStreetLevel } from './layers/streetLevel.js';
 import { createInfrastructureLayers } from '../data/infrastructure.js';
@@ -120,6 +121,7 @@ export function createApplicationCatalog({
         createApplicationFirePerimeters({
           source: sources['fire-perimeters'],
         }),
+        createApplicationGnssInterference(),
         createApplicationAlpr({ surface, source: sources.alpr }),
         createApplicationStreetLevel({
           surface,

src/app/constructCatalog.test.mjs

@@ -60,6 +60,7 @@ test('catalogs construct distinct layers and classification from their supplied
       '2026-09-21T12:00:00.000Z',
     );
   assert.ok(first.get('fire-perimeters'));
+  assert.ok(first.get('gnss-interference'));
   assert.ok(first.get('transit'));
   const order = first.layers.map(({ id }) => id);
   assert.deepEqual(

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,
+  });
+}