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-augustine-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Adésto supplicatiónibus nostris, omnípotens Deus: et, quibus fidúciam sperándæ pietátis indúlges, intercedénte beáto Augustíno Confessóre tuo atque Pontífice, consuétæ misericórdiæ tríbue benígnus efféctum.
     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, saith the Lord.
     V. The Lord led the just through the right ways:
@@ -22,7 +22,7 @@ text:
     Let us pray.
     Graciously hear our supplications, O Almighty God, and as Thou hast given unto us the hope that we are of the number of them upon whom Thou wilt show mercy, grant unto us in thy goodness, that, helped by the prayers of thy blessed Confessor and Bishop Augustine, we may experience the fulfillment of thine accustomed loving-kindness.
     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