fix: address GNSS integrity and aircraft emergency review findings

src/sources/live/aircraft.js

@@ -1,3 +1,4 @@
+import { normalizeSquawk } from '../../data/aircraftEmergency.js';
 import {
   admitRecords,
   cleanText,
@@ -30,9 +31,9 @@ export function normalizeOpenSkyAircraft(row) {
     typeCode: null,
     registration: null,
     operator: null,
-    squawk: cleanText(row[14]) || null,
+    squawk: normalizeSquawk(row[14]),
     // State vectors carry no ADS-B emergency field; the squawk stands alone.
-    emergency: null,
+    emergency: undefined,
   };
 }
 
@@ -71,7 +72,7 @@ export function normalizeReadsbAircraft(row, snapshotTimeMs) {
     typeCode: cleanText(row.t),
     registration: cleanText(row.r),
     operator: cleanText(row.ownOp),
-    squawk: cleanText(row.squawk) || null,
+    squawk: normalizeSquawk(row.squawk),
     emergency: cleanText(row.emergency).toLowerCase() || null,
   };
 }

src/sources/live/contract.test.mjs

@@ -314,11 +314,11 @@ test('identity lookup validates its response and honors body-parse cancellation'
   });
 });
 
-test('transponder squawk and ADS-B emergency status are carried, blanks stay null', () => {
+test('squawks are validated and omitted OpenSky status differs from an explicit ADS-B clear', () => {
   const squawking = [...aircraft, '7700'];
   const civil = openSkySnapshot({ states: [squawking] }, { now }).records[0];
   assert.equal(civil.squawk, '7700');
-  assert.equal(civil.emergency, null);
+  assert.equal(civil.emergency, undefined);
   assert.equal(openSkySnapshot({ states: [aircraft] }).records[0].squawk, null);
   const mil = normalizeReadsbAircraft(
     { hex: 'abc123', lat: 30, lon: -97, squawk: '7600', emergency: 'NORDO' },

src/sources/reference.js

@@ -9,6 +9,6 @@ export function createReferenceSources() {
     earthquakes: createUsgsEarthquakeSource(),
     'fire-perimeters': createWfigsPerimeterSource(),
     cables: createBundledCableSource(),
-    'gnss-interference': createAdsbGnssSource(),
+    'gnss-integrity': createAdsbGnssSource(),
   };
 }

src/sources/reference.test.mjs

@@ -16,15 +16,15 @@ test('reference factories retain compatibility without starting acquisition or s
     'earthquakes',
     'fire-perimeters',
     'cables',
-    'gnss-interference',
+    'gnss-integrity',
   ]);
   assert.notEqual(first.earthquakes, second.earthquakes);
   assert.notEqual(first['fire-perimeters'], second['fire-perimeters']);
   assert.notEqual(first.cables, second.cables);
-  assert.notEqual(first['gnss-interference'], second['gnss-interference']);
+  assert.notEqual(first['gnss-integrity'], second['gnss-integrity']);
   assert.equal(typeof first.earthquakes.getSnapshot, 'function');
   assert.equal(typeof first['fire-perimeters'].getSnapshot, 'function');
   assert.equal(typeof first.cables.fetch, 'function');
-  assert.equal(typeof first['gnss-interference'].getSnapshot, 'function');
+  assert.equal(typeof first['gnss-integrity'].getSnapshot, 'function');
   assert.equal(requests, 0);
 });