fix: say when bike share, transit and place limits leave results out

Bike share and transit read only the three nearest systems, and place
search returns at most five matches within 50 km, while answers read as
complete. Answers now name the systems not searched and say when a place
search limit may have left places out.

src/tools/queries/mobility.test.mjs

@@ -1,6 +1,7 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
 import { composeCatalog, coreTools } from '../index.js';
+import { GBFS_CITY_REGISTRY } from '../../layers/bikeshare/registry.js';
 
 const system = (id, city, centerLat, centerLon) => ({
   id,
@@ -404,3 +405,26 @@ test('transit marks stale feeds and drops expired positions', async () => {
     '1 transit vehicle in 2 km around 30.267, -97.743 (1 feed stale; positions may be out of date).',
   );
 });
+
+test('bike share names the systems it did not search', async () => {
+  const empty = { data: { stations: [] } };
+  const catalog = composeCatalog({
+    tools: coreTools,
+    services: {
+      bikeshare: {
+        systems: GBFS_CITY_REGISTRY,
+        getStations: async () => empty,
+      },
+    },
+  });
+  // New York, Philadelphia, Washington and Boston.
+  const result = await catalog.call('get_bike_share', {
+    area: { bbox: [-77.5, 38.5, -70.5, 42.8] },
+  });
+  assert.equal(result.data.systems.length, 3);
+  assert.ok(result.data.systems_not_searched.length >= 1);
+  assert.match(
+    result.summary,
+    /more not searched: .*; use a smaller area\)\.$/,
+  );
+});