Show a commemorated Sunday's name in the day label

collectCommemorations dropped the plain temporal commemoration name
unconditionally whenever anything else won the day, treating a
commemorated Sunday the same as a commemorated ferial weekday. But a
Sunday isn't "just an ordinary weekday" the way a ferial Tuesday is --
it's real information a reader can't infer from the winner+rank alone,
and it's exactly why a bare commemoration collect (now a full bundle,
previous commit) is being said in the first place. Divino Afflatu
1954's own commemoration line for a comparable case (St. Joachim
winning a Sunday, Aug 16 2026) confirms this: it names the Sunday, no
octave -- restoring that instead of a 2026-09-05 change that had
over-corrected past the actual rule.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LGsATZvfnpQ81HQuoF5JuL

src/calendar/day-label.ts

@@ -509,12 +509,23 @@ function collectCommemorations(
       // pass wrongly scoped this to "only when an Ember commemoration is
       // also present" — user, 2026-09-05: "it has nothing to do with
       // ember-ness"); this plain generic label is dropped unconditionally
-      // whenever it shows up as a mere commemoration, Ember day or not.
+      // whenever it shows up as a mere commemoration on an ordinary
+      // ferial weekday, Ember day or not.
+      //
+      // A commemorated *Sunday* is the one exception (user, 2026-09-05):
+      // unlike a plain ferial Tuesday, "this is also a Sunday" is real
+      // information a reader can't infer from the winner+rank alone — it's
+      // why the Sunday's own collect is being said at all (getDayCollects'
+      // temporalCommemorationPart), and nothing else in the header hints
+      // at it. Shown via the same plain, rank-free `temporalLabel` a
+      // winning Sunday would use for itself.
       if (c.id !== temporalId) {
         const emberName = emberDayLabel(c.id);
         if (emberName) {
           temporal.push(emberName);
         }
+      } else if (day.weekday === 'sunday') {
+        temporal.push(temporalLabel(day));
       }
     } else if (opts.showOctaves && c.id !== opts.excludeOctaveId) {
       const octave = activeOctaves.find((a) => a.id === c.id);