address review findings on voice outlines

- remove the unused Nominatim reserve(); spacing tests now measure the
  actual transport start across processes
- start each queued building's 2 s ground-sampling budget when it
  reaches the head of the queue, and request a frame on promotion
- accept Nominatim and grounds outlines that cross the antimeridian
- let an unnamed school, university, hospital, cemetery, stadium or zoo
  area answer a grounds ask whose head noun names that kind, using only
  the part that holds the point; compare grounds names symmetrically
- charge shared OpenFreeMap consumers their own slice and keep the
  charged budget at the previous 64 MiB
- share one place-name fold, point-in-polygon, line stitching and
  nextTask helper instead of duplicates
- exclude Who's On First sources licensed only as "CC BY (equivalent)"
  or "CC0 (equivalent)"; rebuild the pack from the pinned archives
- whole-word neighbourhood alias guard; correct the outline size-limit
  comment
- restore DATA_SOURCES.md table formatting, keeping only real edits
- test behaviour instead of private engine fields

src/layers/traffic/flow.js

@@ -12,11 +12,7 @@ import {
   roadDotBudget,
 } from './policy.js';
 import { msg } from '../../i18n/index.js';
-
-const nextTask = () =>
-  globalThis.scheduler?.yield
-    ? globalThis.scheduler.yield()
-    : new Promise((resolve) => setTimeout(resolve, 0));
+import { nextTask } from '../../sources/vectorTiles.js';
 
 export function createFlow({ state: layerState, services, parts, source }) {
   const { registerDynamicCredit, TOMTOM_CREDIT } = services.credits;