Add June sanctoral content: 6 saints

Continues the full-year sanctoral import: St. Angela Merici, St. Francis
Caracciolo, St. Boniface of Mainz (Bishop and Martyr, Apostle of Germany --
distinct from the earlier, unrelated St. Boniface Martyr already on May 14),
St. Norbert, St. Margaret of Scotland, and St. Aloysius Gonzaga.

Two of the new fixed dates (June 1, June 4) fall on dates used by two
day-label tests pinned to specific Trinity Sunday years; moved those to
years/dates free of the new entries, with explanatory comments.

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

src/data/propers/common/st-aloysius-gonzaga-collect.yml

@@ -0,0 +1,24 @@
+# Read directly from web/www/horas/Latin/Sancti/06-21.txt's own
+# [Oratio] and its English counterpart.
+id: st-aloysius-gonzaga-collect
+text:
+  la: |
+    Orémus.
+    Cæléstium donórum distribútor, Deus, qui in angélico júvene Aloísio miram vitæ
+    innocéntiam pari cum pœniténtia sociásti: ejus méritis et précibus concéde; ut,
+    innocéntem non secúti, pœniténtem imitémur.
+    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, bestower of heavenly gifts, Who in the angelic youth Aloysius joined
+    wondrous innocence of life to an equally wondrous love of penance; grant, by his
+    merits and prayers, that we who have not followed him in his innocence may imitate
+    him in his penance.
+    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