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-dominic-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Deus, qui Ecclésiam tuam beáti Domínici Confessóris tui illumináre dignátus es méritis et doctrínis: concéde; ut ejus intercessióne temporálibus non destituátur auxíliis, et spirituálibus semper profíciat increméntis.
     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. Well done, thou good and faithful servant; thou hast been faithful over a few things, I will make thee ruler over many things; enter thou into the joy of thy Lord.
     V. The mouth of the righteous speaketh wisdom.
@@ -22,7 +22,7 @@ text:
     Let us pray.
     O God, Who hast been pleased to shed throughout thy Church the light of the worthy deeds and healthful teaching of thy blessed Confessor Dominic, grant unto the same, with the help of his prayers, that she may never be either helpless in things temporal, or barren in things spiritual.
     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: draft
   en: draft