Add May sanctoral content: 10 saints plus the Queenship of the BVM

Continues the full-year sanctoral import (see TODO.md/memory for Jan-Apr):
St. Pius V, St. Antoninus, St. Robert Bellarmine, St. John Baptist de la
Salle, St. Paschal Baylon, St. Venantius, St. Bernardine of Siena, St. John
Baptist de Rossi, St. Augustine of Canterbury, St. Mary Magdalene de Pazzi,
and the Queenship of the BVM (May 31, Duplex II Classis, instituted by Pius
XII's 1954 "Ad cæli Reginam" — full proper content, not a Common fallback).

Adding the Queenship to May 31 surfaces a real collision with Trinity
Sunday in years where Trinity falls on May 31 (2026): since this app
models Trinitytide Sundays as plain ordinary-sunday with no special
first-class standing, a Duplex+ sanctoral feast wins outright there per
the existing precedence rule. Updated the two tests pinned to that date
accordingly, with a third moved to a Trinity Sunday date (2023-06-04)
free of any sanctoral entry to keep testing the octave-vs-anchor-day
interaction in isolation.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/propers/common/st-robert-bellarmine-collect.yml

@@ -0,0 +1,25 @@
+# Read directly from web/www/horas/Latin/Sancti/05-13.txt's own
+# [Oratio] and its English counterpart.
+id: st-robert-bellarmine-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui ad errórum insídias repelléndas et apostólicæ Sedis jura propugnánda,
+    beátum Robértum Pontíficem tuum atque Doctórem mira eruditióne et virtúte
+    decorásti: ejus méritis et intercessióne concéde; ut nos in veritátis amóre
+    crescámus et errántium corda ad Ecclésiæ tuæ rédeant unitátem.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte
+    Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    O God, who didst endow blessed Robert, thy bishop and doctor, with wondrous learning
+    and strength to foil the wiles of error and to defend the rights of the Holy See;
+    grant through his merits and intercession that we may grow in the love of truth, and
+    that the hearts of those gone astray may return to the unity of the Church.
+    Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the
+    unity of the Holy Ghost, God, world without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified