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]>

scripts/package-boundaries.json

@@ -2029,6 +2029,10 @@
       "src/layers/perimeters/records.js",
       "src/layers/perimeters/cards.js",
       "src/layers/perimeters/inciweb.js",
+      "src/app/layers/gnss.js",
+      "src/layers/gnss/index.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js",
       "src/layers/cctv/sourcePolicy.js",
       "src/sources/reference.js",
       "src/search/nominatim.js",
@@ -2613,6 +2617,10 @@
       "src/layers/perimeters/records.js",
       "src/layers/perimeters/cards.js",
       "src/layers/perimeters/inciweb.js",
+      "src/app/layers/gnss.js",
+      "src/layers/gnss/index.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js",
       "src/layers/cctv/sourcePolicy.js",
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
@@ -3324,6 +3332,21 @@
     ],
     "external": ["cesium"]
   },
+  "gnss": {
+    "exports": ["./layers/gnss"],
+    "modules": [
+      "src/layers/gnss/index.js",
+      "src/sources/httpBody.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js"
+    ],
+    "external": ["cesium"]
+  },
+  "gnss-source": {
+    "exports": ["./layers/gnss/source"],
+    "modules": ["src/sources/httpBody.js", "src/layers/gnss/source.js"],
+    "external": []
+  },
   "perimeters-source": {
     "exports": ["./layers/perimeters/source"],
     "modules": [