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/vespers-responsory-common-of-a-martyr.yml

@@ -6,18 +6,18 @@ id: vespers-responsory-common-of-a-martyr
 text:
   la: |
     R.br. Posuísti, Dómine, * Super caput ejus.
-    ℟. Posuísti, Dómine, * Super caput ejus.
-    ℣. Corónam de lápide pretióso.
-    ℟. Super caput ejus.
-    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
-    ℟. Posuísti, Dómine, * Super caput ejus.
+    R. Posuísti, Dómine, * Super caput ejus.
+    V. Corónam de lápide pretióso.
+    R. Super caput ejus.
+    V. Glória Patri, et Fílio, * et Spirítui Sancto.
+    R. Posuísti, Dómine, * Super caput ejus.
   en: |
     R.br. O Lord, Thou hast set * Upon his head.
-    ℟. O Lord, Thou hast set * Upon his head.
-    ℣. A Crown of precious stones.
-    ℟. Upon his head.
-    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
-    ℟. O Lord, Thou hast set * Upon his head.
+    R. O Lord, Thou hast set * Upon his head.
+    V. A Crown of precious stones.
+    R. Upon his head.
+    V. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    R. O Lord, Thou hast set * Upon his head.
 status:
   la: verified
   en: verified