fix(voice): leave aliases a layer id already spells out of the alias hint

The set_layer_visibility layerId hint listed aliases such as "dams" for
local-dams and "weather radar" for weather-radar, which the id in the
enum already says. Leaving those out, and a layer with no other alias,
cuts the Realtime prompt from 52,000 to 51,695 characters. Aliases the id
does not spell (aqhi, hurricanes, clouds) stay, and the runner still
accepts every alias. Refs #1363.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/firstRunExperience.test.mjs

@@ -1055,10 +1055,11 @@ test('the voice TOOL SCHEMA matches the pinned contract — the mission mapping
   // Panel adds timeout and named voice/provider targets; consolidated guidance
   // preserves the mission mapping and globe-rotation arguments.
   // S2 GhostMaps extends the generated layer enums; both feature contracts remain.
-  assert.equal(block.length, 31206, 'serialized tool schema length drifted');
+  // The layer alias hint leaves out aliases the layer id already spells.
+  assert.equal(block.length, 30901, 'serialized tool schema length drifted');
   assert.equal(
     crypto.createHash('sha256').update(block).digest('hex'),
-    'f772df95404494bf492e02fde1beabffdfe61986940bffd0cf9ad5a38d768746',
+    '9e1bd8fde648953c47718ba248758415a95c1484b0da6369df6b89b0505c0de2',
     'the first-run missions must ride EXISTING tools: no schema edit, no cache bust',
   );
   const instructions = fs.readFileSync(