propers: add June's collect and antiphon text

Real collect text for all 16 June saints that have one, plus a real
antiphon for 4 of them and a fifth (Ss. Peter and Paul) that deliberately
reuses the Chair-of-Peter-at-Antioch antiphon text, matching the source's
own cross-reference — same extraction method as prior months.

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

src/data/propers/common/ss-john-and-paul-antiphon.yml

@@ -0,0 +1,11 @@
+# Verified against Divinum Officium (Latin/English Sancti/06-26.txt's own
+# [Ant 1] — the Lauds-hour antiphon, not Terce's, which falls back to a
+# generic Common text instead. These are the Roman martyrs John and Paul,
+# not St. John the Baptist/Evangelist or St. Paul the Apostle.
+id: ss-john-and-paul-antiphon
+text:
+  la: "Astitérunt * justi ante Dóminum, et ab invicem non sunt separáti: cálicem Dómini biberunt, et amici Dei appelláti sunt."
+  en: "The righteous stood * before the Lord, and were not divided from one another: they drank the chalice of the Lord, and were called the friends of God."
+status:
+  la: verified
+  en: verified