Merge main into feat/voice-outlines

Adopts main's loadBundledJson(url, {signal}) and builds the Census and
Who's On First pack URLs when they are read, not at import.

scripts/build-census-places.mjs

@@ -402,10 +402,10 @@ async function build() {
 function filesModule(list) {
   const lines = [
     '// Generated by scripts/build-census-places.mjs; do not edit.',
-    "export const INDEX_URL = new URL('./index.json', import.meta.url);",
+    "export const INDEX_URL = () => new URL('./index.json', import.meta.url);",
     'export const STATE_URLS = {',
     ...list.map(
-      (s) => `  ${s.st}: new URL('./${s.st}.json', import.meta.url),`,
+      (s) => `  ${s.st}: () => new URL('./${s.st}.json', import.meta.url),`,
     ),
     '};',
   ];