fix(routes): keep the 12 s budget from arrival and name the outage to voice

Starting the upstream timeout after the outbound queue let a request run
up to about 19 s, past the Directions layer's 15 s; the budget again runs
from arrival, queue wait included, and a budget spent before the request
leaves the queue answers 429 "routing busy" rather than an outage.

plan_route threw "Routing HTTP 502" for an outage, and voice passes only
the message on; it now throws "Routing service unavailable (HTTP 502)".

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

src/tools/places.js

@@ -190,9 +190,13 @@ export function createRouteService({
         /* the status below is authoritative */
       }
       // A rate limit or an outage (5xx) is the routing service's failure, not
-      // a missing route, whatever the body says.
-      if (response.status === 429 || response.status >= 500)
-        throw httpFailure(response, 'Routing');
+      // a missing route, whatever the body says. Voice hears this message.
+      if (response.status === 429) throw httpFailure(response, 'Routing');
+      if (response.status >= 500)
+        throw new ToolError(
+          'unavailable',
+          `Routing service unavailable (HTTP ${response.status})`,
+        );
       if (payload?.ok === false || response.status === 400)
         return { ok: false, error: payload?.error || 'no route found' };
       if (!response.ok) throw httpFailure(response, 'Routing');

src/tools/queries/places.test.mjs

@@ -283,6 +283,24 @@ test('a routing outage is reported as unavailable, not as invalid arguments', as
     assert.equal(result.structuredContent.error, 'unavailable');
     assert.doesNotMatch(result.content[0].text, /No walk route/);
   }
+  // Voice passes only the message on, so it names the outage itself.
+  const outage = createRouteService({
+    fetchImpl: async () =>
+      Response.json(
+        { ok: false, error: 'routing service unavailable' },
+        { status: 502 },
+      ),
+  });
+  await assert.rejects(
+    outage.route(
+      [
+        { lat: 30, lon: -97 },
+        { lat: 30.01, lon: -97.01 },
+      ],
+      'foot',
+    ),
+    { message: 'Routing service unavailable (HTTP 502)' },
+  );
 });
 
 test('place answers say when the search limits may have left places out', async () => {