propers: Benedictus antiphons for April's sanctoral entries (8/8)

All 8 authored fresh: Francis of Paola, Leo I, Ss. Tiburtius/Valerian/
Maximus, George, Mark, Vitalis, Robert, Peter Martyr. Several share
one Eastertide Common-of-Several-Martyrs antiphon word for word
(Tiburtius/Valerian/Maximus, George, Vitalis, Peter Martyr) -- each
confirmed independently via its own live query rather than assumed
from the others.

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

src/data/propers/common/st-mark-antiphon.yml

@@ -0,0 +1,12 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# live query, St. Mark's own day (2026-04-25). The Benedictus antiphon --
+# see ss-tiburtius-valerian-and-maximus-antiphon.yml's note on the shared
+# Eastertide Common text (his own rendering happened to only show the
+# full form, not a separate incipit, so no '*' is inserted here).
+id: st-mark-antiphon
+text:
+  la: "Fíliæ Jerúsalem, veníte et vidéte Mártyres cum corónis, quibus coronávit eos Dóminus in die solemnitátis et lætítiæ, allelúja, allelúja."
+  en: "Daughters of Jerusalem, come and see the crowned martyrs, the Lord crowned them in his solemnity and delight, alleluia, alleluia."
+status:
+  la: verified
+  en: verified