keep tile outlines honest when the anchor tile fails to load

A building or grounds outline from tiles now needs the tile holding the
anchor: when that tile fails and only neighbours load, no neighbouring
building or area stands in. Nominatim name tags holding several
";"-separated names match each name. Document recovery from a stuck
public-Nominatim dispatch marker, correct the phone credit comment,
drive the slow-device queue test with a mocked performance clock, and
credit GitHub handles in the changelog.

changelog.d/842-voice-outlines.md

@@ -1,23 +1,24 @@
 - Add source-backed voice outlines without public Overpass calls: bundled Census and
   Who's On First boundaries cover places and neighborhoods, OpenFreeMap tiles
   cover streets, buildings, and grounds, and guarded Nominatim lookup handles
-  remaining named areas with bounded caching and usage limits (Bilawal Sidhu,
+  remaining named areas with bounded caching and usage limits (bilawalsidhu,
   #842).
 - Preserve standalone server-token maps, project tile outlines only on demand,
   select building components with their holes independently, preserve non-Latin
   street-name marks, and enforce public Nominatim spacing at fetch invocation.
-  Nominatim now requires explicit endpoint configuration (Manjunath, #842).
+  Nominatim now requires explicit endpoint configuration (manjunath22466, #842).
 - Keep Census labels in filled geometry, handle local dateline outlines in one
   coordinate frame, and require whole settlement names or explicit returned
-  aliases while retaining landmark shorthand (Manjunath, #842).
-- Harden and integrate voice outlines with main (Manjunath, #842).
+  aliases while retaining landmark shorthand (manjunath22466, #842).
+- Harden and integrate voice outlines with main (manjunath22466, #842).
 - Wait for the original building installation before reporting duplicate results,
   including deferred outline installs, without restarting probes
-  (Manjunath, #842).
-- Carry actual outline provenance to visible geometry and retain inline map credits only while the owning outline is displayed (Manjunath, #842).
+  (manjunath22466, #842).
+- Carry actual outline provenance to visible geometry and retain inline map
+  credits only while the owning outline is displayed (manjunath22466, #842).
 - Require a named building's resolved anchor inside its tile footprint, outside
   courtyard holes, while keeping nearby selection for pointed-at buildings
-  (Manjunath, #842).
+  (manjunath22466, #842).
 - Start each queued building's ground-sampling budget when it reaches the head
   of the queue, keep Nominatim outlines that cross the antimeridian, let an
   unnamed school, university, hospital, cemetery, stadium or zoo area answer a
@@ -26,10 +27,13 @@
   shared before, fold place names in one shared helper, and exclude Who's On
   First sources whose licence is only listed as CC BY or CC0 "equivalent",
   including the Ottawa, Saskatoon, Gatineau and Madrid records
-  (Manjunath, #842).
+  (manjunath22466, #842).
 - Skip Nominatim place and outline lookups when the server reports that no
   Nominatim endpoint is configured, so a default install sends no request it
-  would refuse (Manjunath, #842).
+  would refuse (manjunath22466, #842).
 - Keep the phone credit line on screen when map and outline credits make it
   longer, wrapping it within the screen instead of running off the edge
-  (Manjunath, #842).
+  (manjunath22466, #842).
+- Outline nothing from tiles when the tile under the point failed to load, so a
+  neighbouring building or area never stands in for it, and match each of a
+  Nominatim name tag's ";"-separated names (manjunath22466, #842).