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-stanislaus-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Deus, pro cujus honóre gloriósus Póntifex Stanisláus gládiis impiórum occúbuit: præsta, quǽsumus; ut omnes, qui ejus implórant auxílium, petitiónis suæ salutárem consequántur 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. Daughters of Jerusalem, * come and see the crowned martyrs, the Lord crowned them in his solemnity and delight, alleluia, alleluia.
     V. The righteous shall flourish like the palm tree:
@@ -22,7 +22,7 @@ text:
     Let us pray.
     O God, for Whose glory the noble Bishop Stanislaw fell by the swords of sinful men, grant, we beseech thee, that all whosoever ask his help, may find such answer to their petition as may profit them to the everlasting salvation of their souls.
     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