Import St. Agnes's own proper Lauds/Vespers chapter

Live-verified against Divinum Officium (Monastic Tridentinum 1617),
2029-01-21: byte-identical to St. Agatha's own override (Sir 51:1-3).
Confirmed a real, saint-specific shared override between these two
ancient Roman virgin martyrs specifically, not a general Virgin-Martyr
rank-tier variant -- St. Lucy (also a Canon-of-the-Mass virgin martyr)
uses the plain Common chapter on her own clean day. Responsory, hymn,
and versicle reuse Common-of-a-Virgin-Martyr's own content.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc

src/data/propers/common/vespers-versicle-st-agnes.yml

@@ -0,0 +1,14 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C6` live query, 2026-08 -- same versicle as Lauds (see lauds-
+# versicle-st-agnes.yml).
+id: vespers-versicle-st-agnes
+text:
+  la: |
+    ℣. Diffúsa est grátia in lábiis tuis.
+    ℟. Proptérea benedíxit te Deus in ætérnum.
+  en: |
+    ℣. Grace is poured into thy lips.
+    ℟. Therefore God hath blessed thee for ever.
+status:
+  la: verified
+  en: verified