Add Our Lady of Guadalupe (Dec 12)

Sourced from the reference engine's national-calendar file. Own proper
collect, Ant 1, and Matins Nocturn 2 narrative reading (Juan Diego's
apparition account), same scope as the Our Lady of Lourdes feast --
Common of the BVM (C11) carries the rest. No canonization-deflation
question here (an apparition title, cultus confirmed 1754/1910). At
Duplex she ties the Immaculate Conception octave's threshold on a
non-closing day, which favors the occurring saint, so she wins Dec 12
outright.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwsZQMjALCvy7u9tFDWmuQ

src/data/propers/common/our-lady-of-guadalupe-antiphon.yml

@@ -0,0 +1,9 @@
+# Read directly from web/www/horas/Latin/Sancti/12-12n.txt's own [Ant 1]
+# and its English counterpart.
+id: our-lady-of-guadalupe-antiphon
+text:
+  la: "Elégi et sanctificávi locum istum; * Ut sit ibi nomen meum, et permáneant óculi mei, et cor meum ibi cunctis diébus."
+  en: "I have chosen and made holy this place, * that my name may be there, and mine eyes, and my heart may remain there for all the days."
+status:
+  la: verified
+  en: verified