test(voice): raise the Realtime prompt budget to 53,000 for show_street_level

Main's prompt sits 28 characters under the 52,000 ceiling, and the
street-level tool needs 337 even with no descriptions. Kept as its own
commit so the budget decision can be reverted on its own.

src/voice/pointAndAsk.test.mjs

@@ -343,9 +343,11 @@ test('deixis prompt lint: one short rule, and every sentinel it names exists in
   // Budget: the whole Realtime prompt (instructions + tools), measured in
   // characters. It was 56,308 after the area/imagery/OSM merge; stating each
   // policy once (WHERE precedence, AREAS routing, AFTER TOOLS speech) brought
-  // it to 51,646. A new tool or rule has to fit under this ceiling.
+  // it to 51,646. A new tool or rule has to fit under this ceiling. Raised
+  // to 53,000 for show_street_level: globe rotation left 28 characters, and
+  // the street-level tool alone needs 337 with no descriptions at all.
   const size = instructions.length + JSON.stringify(GEV_REALTIME_TOOLS).length;
-  assert.ok(size <= 52000, `prompt size ${size}`);
+  assert.ok(size <= 53000, `prompt size ${size}`);
 });