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-pius-v-collect.yml

@@ -0,0 +1,26 @@
+# Read directly from web/www/horas/Latin/Sancti/05-05.txt's own
+# [Oratio] and its English counterpart.
+id: st-pius-v-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui, ad conteréndos Ecclésiæ tuæ hostes et ad divínum cultum reparándum,
+    beátum Pium Pontíficem Máximum elígere dignátus es: fac nos ipsíus deféndi
+    præsídiis et ita tuis inhærére obséquiis; ut, ómnium hóstium superátis insídiis,
+    perpétua pace lætémur.
+    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 when Thou wast pleased to break the teeth of them that hate thy Church,
+    and to restore again the solemn worship of thyself, didst choose the blessed Pope
+    Pius to work for thee in that matter, grant that he may still be a tower of strength
+    for us. Grant that we also may be more than conquerors over all that make war upon
+    our souls, and in the end may enter into perfect peace in thy presence.
+    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