Normalize versicle notation to plain V./R. across propers

Unicode ℣/℟ (U+2123/U+211F) were mixed unpredictably with plain V./R.
across ~550 proper YAML files, sometimes within the same file. Screen
readers can't announce the unicode glyphs. Replace all instances with
plain text.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QC6jHsj75xcsTkapqJR6fD

src/data/propers/common/holy-name-of-mary-commemoration.yml

@@ -12,7 +12,7 @@ text:
     mereántur in cælis.
     Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte
     Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
-    ℟. Amen.
+    R. Amen.
   en: |
     Ant. O Holy Mary, * be thou an help to the helpless, a strength to the fearful, a comfort to the sorrowful; pray for the people, plead for the clergy, make intercession for all women vowed to God; may all that are keeping this Commemoration of thine holy Name feel the might of thine assistance.
     V. Pray for us, holy Mother of God.
@@ -24,7 +24,7 @@ text:
     attain unto thine everlasting joy in heaven.
     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.
+    R. Amen.
 status:
   la: verified
   en: verified