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-angela-merici-collect.yml

@@ -0,0 +1,24 @@
+# Read directly from web/www/horas/Latin/Sancti/06-01.txt's own
+# [Oratio] and its English counterpart.
+id: st-angela-merici-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui novum per beátam Angelam sacrárum Vírginum collégium in Ecclésia tua
+    floréscere voluísti: da nobis, ejus intercessióne, angélicis móribus vívere; ut,
+    terrénis ómnibus abdicátis, gáudiis pérfrui mereámur ætérnis.
+    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, Whose will it hath been to use blessed Angela as a means whereby to make a new
+    fellowship of virgins to grow and flourish in Thy Church, grant unto us, at her
+    prayers, so angelically to live, that we may freely lay aside all earthly things, and
+    worthily enter upon the enjoyment of those things which are eternal.
+    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