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/data/placeNames.js

@@ -0,0 +1,34 @@
+/** Latin letters that Unicode decomposition does not fold to plain ASCII. */
+const FOLD = {
+  ß: 'ss',
+  ø: 'o',
+  æ: 'ae',
+  ł: 'l',
+  đ: 'd',
+  ı: 'i',
+  œ: 'oe',
+  þ: 'th',
+};
+
+/**
+ * Comparable form of a place name, shared by the bundled packs, the
+ * OpenFreeMap street and grounds matchers and the Nominatim server: case
+ * folded, accents removed from Latin letters only, punctuation and symbols
+ * collapsed to single spaces, and a leading "the" dropped. Other scripts keep
+ * their marks, so "कुल मार्ग" and "काली मार्ग" stay distinct while "São Paulo",
+ * "sao paulo" and "SÃO PAULO!" meet.
+ *
+ * @param {unknown} value
+ * @returns {string}
+ */
+export function foldPlaceName(value) {
+  return String(value ?? '')
+    .toLowerCase()
+    .replace(/[ßøæłđıœþ]/g, (c) => FOLD[c])
+    .normalize('NFKD')
+    .replace(/(\p{Script=Latin})\p{M}+/gu, '$1')
+    .normalize('NFKC')
+    .replace(/[^\p{L}\p{M}\p{N}]+/gu, ' ')
+    .trim()
+    .replace(/^the /, '');
+}