propers: add December's collect and antiphon text

10 collects, 5 antiphons -- including backfilling the pre-existing
Immaculate Conception entry. St. Damasus's collect is Latin-only (no
English translation exists in the reference source at all); a few
others (All Saints, Bibiana, Immaculate Conception) needed their English
read directly from the raw source file after the live query's English
side either omitted the Oratio translation or rendered the wrong Marian
feast's text -- caught by cross-checking, not assumed.

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

src/data/propers/common/st-damasus-collect.yml

@@ -0,0 +1,16 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) -- Latin
+# read directly from the reference engine's own real-date output
+# (2025-12-11). No English translation exists in this reference project at
+# all (checked both the live query and the raw English Sancti/12-11.txt
+# file directly -- only the biographical Lectios are translated, not the
+# Oratio), so en is left honestly missing rather than translated here.
+id: st-damasus-collect
+text:
+  la: |
+    Orémus.
+    Exáudi, Dómine, preces nostras: et interveniénte beáto Dámaso Confessóre tuo atque Pontífice, indulgéntiam nobis tríbue placátus et pacem.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+status:
+  la: verified
+  en: missing