Author 10 sanctoral Common-category Magnificat antiphons

getMagnificatAntiphon's Common-category fallback
(magnificat-antiphon-${benedictusCommon}) had never been authored for
any of the 11 real Common categories saints fall back to -- only the
temporal-cycle side of this gap had been closed previously. Sourced
each from its Commune file's own [Ant 3] (Second Vespers), live-verified
against Ss. Placid and Companions, St. Blaise, and St. John Gualbert's
real evenings.

common-of-a-vigil (the 11th category) is handled separately, in code --
see the next commit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014QEe9oTbn1UjQVAYcCoW1a

src/data/propers/common/magnificat-antiphon-common-of-a-virgin.yml

@@ -0,0 +1,16 @@
+# Second Vespers Magnificat antiphon for `common-of-a-virgin` (Commune
+# Unius Virginis, Latin/Commune/C6.txt) -- its own [Ant 3] is a bare
+# `@:Ant 1` cross-reference, i.e. this Common reuses its First Vespers
+# antiphon at Second Vespers too (same pattern as
+# common-of-several-women-martyrs, below). Ant 2 in this same file
+# matches the already-authored benedictus-antiphon-common-of-a-virgin.yml
+# exactly, confirming the read. Covers `common-of-a-virgin-martyr` and
+# `common-of-a-holy-woman` too, same as the Benedictus file. Not
+# independently live-queried.
+id: magnificat-antiphon-common-of-a-virgin
+text:
+  la: "Veni, Sponsa Christi, * áccipe corónam, quam tibi Dóminus præparávit in ætérnum."
+  en: "Come, Bride of Christ, and take the everlasting crown * which the Lord hath prepared for thee."
+status:
+  la: verified
+  en: verified