Register the all-people-groups row, which the previous commit missed

The insertion in ef8b8602 failed on a bad anchor and the commit went ahead anyway,
so the migration landed with no row asserting it. The gates all passed, because a
register that does not mention a file cannot fail on it -- a green run that proved
nothing about the thing just changed.

The row asserts the useOptionalI18n form and that its inline EN map is still passed
as the fallback.

internal/check-optional-t-equivalence.mjs

@@ -143,6 +143,12 @@ const SITES = [
   // last segment it always did.
   ['plugin-designs/my-upg-100-list/poster-wall.vue',  'useOptionalT', 'humanizeKey(k)'],
   ['plugin-designs/my-upg-100-list/upg-100-mfe.vue',  'useOptionalT', 'humanizeKey(k)'],
+  // wave 3d — all-people-groups. Treated as UNOWNED (studio agreed), so the conservative reading wins:
+  // its inline EN map stays the fallback rather than switching to the catalogue, because nobody is
+  // available to decide that this bundle should start honouring the locale on a bare host. An unowned
+  // file is the wrong place to make a product decision by default.
+  // First site on the {t, te, locale} form: it needs locale for toLocaleString.
+  ['plugin-designs/all-people-groups/all-people-groups.vue', 'useOptionalI18n', 'fallback: (full) =>'],
 ]
 // ★ ONE FILE KEEPS TWO BARE useI18n CALLS ON PURPOSE, and the count is asserted rather than waived.
 // resources-map.vue reads the LOCALE twice (`useI18n().locale.value`) to decide isEnglish and the