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/ss-tiburtius-valerian-and-maximus-antiphon.yml

@@ -0,0 +1,13 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# live query, Ss. Tiburtius, Valerian, and Maximus's own day (2027-04-14).
+# The Benedictus antiphon -- shared word-for-word with St. George's,
+# St. Vitalis's, and St. Peter Martyr's own (all draw on the same
+# Eastertide Common of Several Martyrs text, confirmed independently for
+# each rather than assumed).
+id: ss-tiburtius-valerian-and-maximus-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