fix(local-adsb): track altitude freshness and held-value provenance

src/firstRunExperience.test.mjs

@@ -995,10 +995,11 @@ test('the voice TOOL SCHEMA matches the pinned contract — the mission mapping
   // list descriptions; the missions still ride existing tools.
   // Street Level and GNSS extend the manifest; broadcast caveats describe tracked and analyst aircraft.
   // Air quality (ECCC AQHI) extends the manifest.
-  assert.equal(block.length, 30655, 'serialized tool schema length drifted');
+  // Local ADS-B adds altitude quality, observation time and source field hints.
+  assert.equal(block.length, 30705, 'serialized tool schema length drifted');
   assert.equal(
     crypto.createHash('sha256').update(block).digest('hex'),
-    '3b1d5e77c10a92f6543a4f9d1ff1870101a0306b65e5b8a6113111c81eda371e',
+    'f3835c8f5b1732cbd5b45e3eb46baa9a979830be2d23dd1c9888a3e98a35f082',
     'the first-run missions must ride EXISTING tools: no schema edit, no cache bust',
   );
   const instructions = fs.readFileSync(