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-versicle-common-of-an-apostle.yml

@@ -4,11 +4,11 @@
 id: vespers-versicle-common-of-an-apostle
 text:
   la: |
-    ℣. Annuntiavérunt ópera Dei.
-    ℟. Et facta ejus intellexérunt.
+    V. Annuntiavérunt ópera Dei.
+    R. Et facta ejus intellexérunt.
   en: |
-    ℣. They declared the works of God.
-    ℟. And understood his doings.
+    V. They declared the works of God.
+    R. And understood his doings.
 status:
   la: verified
   en: verified