diff --git a/internal/check-optional-t-equivalence.mjs b/internal/check-optional-t-equivalence.mjs
index 7c1e1cf27..e4bbe3e2f 100644
--- a/internal/check-optional-t-equivalence.mjs
+++ b/internal/check-optional-t-equivalence.mjs
@@ -138,6 +138,21 @@ const SITES = [
   ['plugin-designs/cities-internet/connectivity-list.vue', 'useOptionalT', null],
   ['plugin-designs/cities-internet/connectivity-map.vue',  'useOptionalT', null],
   ['plugin-designs/cities-internet/data-tables.vue',       'useOptionalT', null],
+  // wave 3c — my-upg-100-list (owner: upg100-plugin). NOTE THE THIRD COLUMN: these two arrive with NO
+  // fallback, not with humanizeKey(k). regions-plugin's 4c05e589 had them as 'humanizeKey(k)' — correct
+  // for the migration it was written against, and wrong the moment the fallback was DELETED.
+  // ★ WHY THEY MOVED TO THE CATALOGUE. humanizeKey rendered a key's last segment title-cased, which
+  // failed two different ways: on the messages keys it printed "Upg100 Wall Intro" where a whole
+  // sentence exists (wrong even in English), and on the tabs keys it printed the RIGHT English by
+  // coincidence — the key is named after the word — so it looked correct forever while every
+  // non-English reader silently got English. A fallback that agrees with en is indistinguishable from
+  // a working translation until someone changes locale.
+  // The premise for keeping it ("these keys are not fully catalogued") was mine and was FALSE: seven
+  // keys across both files, all string literals, every one present in all eleven locales, 0 gaps.
+  // Product call taken by dx-shepherd (UPGHK, 2026-09-27) because it changes what seven vue-i18n-less
+  // bundles render — the same class of decision gospel-plugin took for its four sites above.
+  ['plugin-designs/my-upg-100-list/poster-wall.vue',       'useOptionalT', null],
+  ['plugin-designs/my-upg-100-list/upg-100-mfe.vue',       'useOptionalT', null],
 ]
 // ★ 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