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/st-agnes-collect.yml

@@ -8,12 +8,12 @@ text:
     Orémus.
     Omnípotens sempitérne Deus, qui infírma mundi éligis, ut fórtia quæque confúndas: concéde propítius; ut, qui beátæ Agnétis Vírginis et Mártyris tuæ solémnia cólimus, ejus apud te patrocínia sentiámus.
     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: |
     Let us pray.
     O Almighty and everlasting God, Who hast chosen the weak things of the world to confound the things which are mighty, mercifully grant unto us that we who keep the solemn feast of thy blessed Virgin and Martyr Agnes, may feel the power of her intercession with thee.
     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