propers: Benedictus antiphons for May's sanctoral entries (13/13)

10 authored fresh (Athanasius, Monica, Stanislaus, Ss. Nereus/
Achilleus/Domitilla/Pancras, Boniface, Ubald, Peter Celestine, Urban I,
Eleutherius, John I), 3 corrected (Ss. Philip and James, John Before
the Latin Gate, the Apparition of St. Michael -- each confirmed
sourced from the Roman rite's raw [Ant 1] rather than a real Monastic
1617 rendering, same pattern as every month so far).

Urban I, Eleutherius, and John I (all late May) needed 2038 to find a
year not swallowed by Ascensiontide/Pentecost/Trinity/Corpus Christi
in some combination -- the latest year needed yet.

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

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

@@ -0,0 +1,12 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# live query, St. Boniface's own day (2031-05-14 -- Ascensiontide/
+# Pentecost govern every year from 2026-2030). The Benedictus antiphon --
+# see st-john-before-the-latin-gate-antiphon.yml's note on the shared
+# Eastertide Common text.
+id: st-boniface-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