test(osm): cover the place-search client and the follow-up handoff

From review:
- The browser client for /api/osm/features gets its own tests (request
  shape, abort, network failure, coded refusals), and a 200 whose body is
  not JSON is now a failure instead of zero places.
- An end-to-end test runs resolve_area, osm_query and an analyst follow-up
  through the real runner and checks the follow-up keeps the area; it fails
  with the wiring reverted.
- The Realtime token test pins Overpass off and compares the full tool
  schemas again instead of names taken from the environment.

scripts/format-scope.json

@@ -1211,6 +1211,7 @@
   "src/tooling/nominatimOutlineRoute.test.mjs",
   "src/data/areaGeometry.test.mjs",
   "src/data/areaResolver.test.mjs",
+  "src/sources/osmFeatures.test.mjs",
   "src/layers/osmPlaces/index.test.mjs",
   "src/tooling/boundedCache.test.mjs",
   "src/tooling/osmFeaturesRoute.test.mjs",

src/sources/osmFeatures.js

@@ -49,6 +49,14 @@ export function createOsmFeatureSource({
         error:
           body?.error || `OpenStreetMap search failed (${response.status}).`,
       };
+    // A garbled success (a proxy's error page) is a failure, not zero places.
+    if (!body || typeof body !== 'object')
+      return {
+        ok: false,
+        status: response.status,
+        code: null,
+        error: 'OpenStreetMap search returned an unreadable answer.',
+      };
     return { ok: true, ...body };
   };
 }

src/sources/osmFeatures.test.mjs

@@ -0,0 +1,94 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createOsmFeatureSource } from './osmFeatures.js';
+
+const respond = (status, body) => ({
+  ok: status >= 200 && status < 300,
+  status,
+  json: async () => {
+    if (typeof body === 'string') throw new SyntaxError('not JSON');
+    return body;
+  },
+});
+
+test('the request names only the preset, box, mode and limit', async () => {
+  let asked = null;
+  const search = createOsmFeatureSource({
+    fetchImpl: async (url) => {
+      asked = new URL(url, 'http://localhost');
+      return respond(200, { features: [], count: 0 });
+    },
+  });
+  const result = await search({
+    preset: 'hospital',
+    bbox: [85.2, 27.6, 85.4, 27.8],
+    limit: 50,
+  });
+  assert.equal(result.ok, true);
+  assert.equal(asked.pathname, '/api/osm/features');
+  assert.equal(asked.searchParams.get('preset'), 'hospital');
+  assert.equal(
+    asked.searchParams.get('bbox'),
+    '85.20000,27.60000,85.40000,27.80000',
+  );
+  assert.equal(asked.searchParams.get('mode'), 'features');
+  assert.equal(asked.searchParams.get('limit'), '50');
+});
+
+test('an aborted search rethrows; a network failure is a refusal', async () => {
+  const controller = new AbortController();
+  const aborting = createOsmFeatureSource({
+    fetchImpl: async () => {
+      controller.abort();
+      throw new DOMException('Aborted', 'AbortError');
+    },
+  });
+  await assert.rejects(
+    aborting(
+      { preset: 'hospital', bbox: [0, 0, 1, 1] },
+      { signal: controller.signal },
+    ),
+    { name: 'AbortError' },
+  );
+  const offline = createOsmFeatureSource({
+    fetchImpl: async () => {
+      throw new TypeError('fetch failed');
+    },
+  });
+  const refused = await offline({ preset: 'hospital', bbox: [0, 0, 1, 1] });
+  assert.deepEqual([refused.ok, refused.status], [false, 0]);
+});
+
+test('server refusals keep their status and code', async () => {
+  const notConfigured = createOsmFeatureSource({
+    fetchImpl: async () =>
+      respond(503, {
+        error: 'Place search needs a configured Overpass server.',
+        code: 'OVERPASS_NOT_CONFIGURED',
+      }),
+  });
+  const refused = await notConfigured({
+    preset: 'hospital',
+    bbox: [0, 0, 1, 1],
+  });
+  assert.equal(refused.ok, false);
+  assert.equal(refused.status, 503);
+  assert.equal(refused.code, 'OVERPASS_NOT_CONFIGURED');
+  const busy = createOsmFeatureSource({
+    fetchImpl: async () => respond(429, '<html>Too Many Requests</html>'),
+  });
+  const limited = await busy({ preset: 'hospital', bbox: [0, 0, 1, 1] });
+  assert.equal(limited.ok, false);
+  assert.equal(limited.status, 429);
+  assert.equal(limited.code, null);
+  assert.match(limited.error, /429/);
+});
+
+test('a success whose body is not JSON is a failure, not zero places', async () => {
+  const garbled = createOsmFeatureSource({
+    fetchImpl: async () => respond(200, '<html>proxy error</html>'),
+  });
+  const result = await garbled({ preset: 'hospital', bbox: [0, 0, 1, 1] });
+  assert.equal(result.ok, false);
+  assert.equal(result.status, 200);
+});

src/tooling/localServices.test.mjs

@@ -747,6 +747,8 @@ test('Realtime service configuration selects compatible endpoint/model without f
         endpoint: 'https://voice.example/client-secrets',
         models: { standard: 'configured-model' },
         resolveApiKey: () => 'server-fixture',
+        // Pinned, so the expected tool list never depends on this machine's env.
+        overpassConfigured: () => false,
         fetchImpl: async (url, options) => {
           assert.equal(url, 'https://voice.example/client-secrets');
           assert.equal(options.redirect, 'error');
@@ -754,10 +756,8 @@ test('Realtime service configuration selects compatible endpoint/model without f
           const payload = JSON.parse(options.body);
           assert.equal(payload.session.model, 'configured-model');
           assert.deepEqual(
-            payload.session.tools.map((tool) => tool.name),
+            payload.session.tools,
-            realtimeTools({
+            realtimeTools({ overpass: false }),
-              overpass: Boolean(process.env.OVERPASS_UPSTREAMS),
-            }).map((tool) => tool.name),
           );
           return Response.json({ value: 'short-lived-fixture' });
         },

src/voice/gevActions.test.mjs

@@ -5257,6 +5257,76 @@ test('different OSM siblings from one response do not race the server slot or me
   assert.deepEqual(resultKinds, ['hospital', 'school']);
 });
 
+test('an analyst follow-up on OSM places keeps the area they were found in', async () => {
+  const viewer = {
+    clock: { onTick: { addEventListener: () => () => {} } },
+    scene: { canvas: { addEventListener() {}, removeEventListener() {} } },
+    camera: {
+      moveEnd: { addEventListener() {} },
+      positionCartographic: { height: 300_000, latitude: 0, longitude: 0 },
+    },
+  };
+  let rows = [];
+  const osmLayer = {
+    setResults(next) {
+      rows = next;
+    },
+    getAnalystRecords: () => rows,
+  };
+  const runner = createGevActionRunner({
+    viewer,
+    styleManager: {},
+    dataManager: {
+      layers: new Map([['osm-places', { module: osmLayer }]]),
+      isEnabled: (id) => id === 'osm-places',
+      getAll: () => [],
+    },
+    areaOptions: {
+      findRegion: async () => null,
+      findAdminCandidates: async () => [
+        {
+          kind: 'state',
+          name: 'Test Province',
+          country: 'Testland',
+          source: 'natural-earth',
+          polygons: [
+            [
+              [
+                [0, 0],
+                [1, 0],
+                [1, 1],
+                [0, 1],
+                [0, 0],
+              ],
+            ],
+          ],
+        },
+      ],
+    },
+    osmSearch: async () => ({
+      ok: true,
+      truncated: false,
+      features: [
+        { id: 'node/1', lat: 0.5, lon: 0.5, tags: { name: 'North Hospital', emergency: 'yes' } },
+        { id: 'node/2', lat: 0.4, lon: 0.6, tags: { name: 'South Hospital', emergency: 'no' } },
+      ],
+    }),
+  });
+  const area = await runner('resolve_area', { query: 'Test Province', level: 'admin1' });
+  assert.equal(area.ok, true);
+  const found = await runner('osm_query', { what: 'hospitals', areaId: area.areaId });
+  assert.equal(found.ok, true, found.error);
+  assert.equal(found.count, 2);
+  const followUp = await runner('analyst_query', {
+    layers: ['osm-places'],
+    followUp: true,
+    filters: [{ field: 'emergency', op: 'eq', value: 'yes' }],
+  });
+  assert.equal(followUp.ok, true, followUp.error);
+  assert.equal(followUp.count, 1);
+  assert.equal(followUp.scopeLabel, 'inside Test Province');
+});
+
 test('a capped Contacts snapshot is a lower bound from one immutable cohort', async () => {
   globalThis.window = globalThis.window || {
     clearTimeout,