Add St. Gabriel Archangel, the Annunciation, St. John Damascene,

St. John Capistrano -- March complete

Finishes March's sweep of previously-never-added sanctoral content.
The Annunciation (Mar 25) was one of the two feasts literally named in
this app's original stale "fixed BVM feast, excluded per the usual
convention" note (alongside Purification, already fixed).

St. John Damascene is the first common-of-a-confessor-doctor saint;
his own Commune/C5a points its own Benedictus antiphon back at C4a's,
so he reuses the already-authored
benedictus-antiphon-common-of-a-confessor-bishop.yml directly rather
than duplicating it.

npm test (365 tests) and tsc --noEmit both pass.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/propers/common/st-gabriel-archangel-collect.yml

@@ -0,0 +1,23 @@
+# Read directly from web/www/horas/Latin/Sancti/03-24.txt's own
+# [Oratio] and its English counterpart.
+id: st-gabriel-archangel-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui inter céteros Angelos, ad annuntiándum Incarnatiónis tuæ mystérium, Gabriélem
+    Archángelum elegísti: concéde propítius; ut qui festum ejus celebrámus in terris,
+    ipsíus patrocínium sentiámus in cælis.
+    Qui vivis et regnas cum Deo Patre, in unitáte Spíritus Sancti, Deus, per ómnia sǽcula
+    sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    O God, Who didst choose the Archangel Gabriel from among all Thine other Angels, and
+    send him to herald the mystery of Thine Incarnation, mercifully grant that we who keep
+    his feast upon earth may feel his protection in heaven.
+    Who livest and reignest with God the Father, in the unity of the Holy Ghost, God, world
+    without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified