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-philip-and-james-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Deus, qui nos ánnua Apostolórum tuórum Philíppi et Jacóbi solemnitáte lætíficas: præsta, quǽsumus; ut, quorum gaudémus méritis, instruámur exémplis.
     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. I am the Way the Truth, and the Life: no man cometh unto the Father, but by Me. Alleluia.
     V. They have declared the works of God:
@@ -22,7 +22,7 @@ text:
     Let us pray.
     O God, Who dost every year gladden us by the solemn memorial of thine Apostles Philip and James, grant us grace, we beseech thee, not only to rejoice because of their worthy deeds, but also to tread in their footsteps.
     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