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-responsory-st-agnes.yml

@@ -0,0 +1,22 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Vespers
+# `votive=C6` live query, 2026-08 -- see lauds-capitulum-common-of-a-
+# virgin-martyr.yml's header for why the votive-office view was used.
+id: vespers-responsory-st-agnes
+text:
+  la: |
+    R.br. Adjuvábit eam * Deus vultu suo.
+    ℟. Adjuvábit eam * Deus vultu suo.
+    ℣. Deus in médio ejus, non commovébitur.
+    ℟. Deus vultu suo.
+    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
+    ℟. Adjuvábit eam * Deus vultu suo.
+  en: |
+    R.br. God shall help her * with His countenance.
+    ℟. God shall help her * with His countenance.
+    ℣. God is in the midst of her, she shall not be moved.
+    ℟. With His countenance.
+    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    ℟. God shall help her * with His countenance.
+status:
+  la: verified
+  en: verified