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-norbert-collect.yml

@@ -0,0 +1,25 @@
+# Read directly from web/www/horas/Latin/Sancti/06-06.txt's own
+# [Oratio] and its English counterpart.
+id: st-norbert-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui beátum Norbértum Confessórem tuum atque Pontíficem verbi tui præcónem
+    exímium effecísti, et per eum Ecclésiam tuam nova prole fecundásti: præsta,
+    quǽsumus; ut, ejúsdem suffragántibus méritis, quod ore simul et ópere dócuit, te
+    adjuvánte, exercére valeámus.
+    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 made blessed Norbert, thy Confessor and Bishop, a brilliant preacher of
+    thy word, and through him enriched thy Church with a new religious family, grant, we
+    beseech thee, that by his prayerful intercession and thy help, we may be able to do
+    what he has taught us by his words and deeds.
+    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