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/ss-cosmas-and-damian-commemoration.yml

@@ -13,7 +13,7 @@ text:
     Orémus.
     Præsta, quǽsumus, omnípotens Deus: ut, qui sanctórum Mártyrum tuórum Cosmæ et Damiáni natalícia cólimus, a cunctis malis imminéntibus, eórum intercessiónibus, liberémur.
     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. Even the very hairs of your head are all numbered: * fear not therefore; ye are of more value than many sparrows.
     V. The saints shall rejoice in glory:
@@ -21,7 +21,7 @@ text:
     Let us pray.
     Grant, we beseech thee, O Almighty God, that we who keep the birthday of thine holy Martyrs Cosmas and Damian may at their prayers be delivered from all dangers that presently hang over us.
     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