Add December Matins readings for SanctiM-track saints, completing the pass

13 of December's 15 SanctiM-track saints authored (st-bibiana, st-nicholas,
st-ambrose, immaculate-conception, st-damasus, st-lucy, st-thomas-apostle,
st-stephen-protomartyr, st-john-apostle, holy-innocents, st-thomas-becket,
st-silvester-i, st-eusebius-of-vercelli); st-barbara and st-melchiades left
unauthored as Common-only. This is the twelfth and final month of the
SanctiM (Monastic 1617)-track saints' Matins readings pass — 129 saints
authored across the whole year.

Adding St. Eusebius of Vercelli's content surfaces a 3rd Matins lesson on
the existing Advent III Tuesday proof date (Dec 15 falls under his
commemoration); updated matins.test.ts accordingly — the "commemorations
get their own reading" design working as intended, not a regression.

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

src/data/propers/nocturn-readings/st-damasus.yml

@@ -0,0 +1,73 @@
+# Matins Nocturn 2 reading for St. Damasus I, Pope, Confessor
+# (Dec 11) — SanctiM/12-11.txt inherits the whole day (`@Sancti/12-11`)
+# with no Nocturn 2 override, so this feast's own proper content is
+# sourced from the Tridentine track exactly as for a pre-1955 saint
+# (see memory vu-matins-pre1955-saints, vu-matins-sanctim-saints).
+# web/www/horas/Latin/Sancti/12-11.txt, English/Sancti/12-11.txt.
+# Lectio4-6 combined into one reading, one continuous vita, no
+# genuine source break.
+id: st-damasus
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Dámasus Hispánus, vir egrégius et erudítus in Scriptúris, indícto primo
+        Constantinopolitáno concílio nefáriam Eunómii et Macedónii hæresim exstínxit. Idem
+        Ariminénsem convéntum a Libério jam ante rejéctum, íterum condemnávit: in quo, ut
+        scribit sanctus Hierónymus, Valéntis potíssimum et Ursácii fráudibus damnátio
+        Nicænæ fídei conclamáta fuit: et ingemíscens orbis terrárum, se Ariánum esse mirátus
+        est.
+
+
+        Basílicas duas ædificávit, álteram sancti Lauréntii nómine ad theátrum Pompéji, quam
+        máximis munéribus auxit, eíque domos et prædia attríbuit: álteram via Ardeatína ad
+        Catacúmbas. Platóniam étiam, ubi córpora sanctórum Petri et Pauli aliquámdiu
+        jacuérunt, dedicávit, et exornávit elegántibus vérsibus. Idémque prosa et versu
+        scripsit de virginitáte, múltaque ália metro édidit.
+
+
+        Pœnam taliónis constítuit iis, qui álterum falsi críminis accusássent. Státuit, ut,
+        quod plúribus jam locis erat in usu, Psalmi per omnes ecclésias die noctúque ab
+        altérnis caneréntur; et in fine cujúsque Psalmi dicerétur: Glória Patri, et Fílio, et
+        Spirítui Sancto. Ejus jussu sanctus Hierónymus novum testaméntum Græcæ fídei réddidit.
+        Cum Ecclésiam rexísset annos decem et septem, menses duos, dies vigínti sex, et
+        habuísset ordinatiónes quinque mense Decémbri, quibus creávit presbyteros trigínta
+        unum, diáconos úndecim, epíscopos per divérsa loca sexagínta duos; virtúte, doctrína,
+        ac prudéntia clarus, prope octogenárius, Theodósio senióre imperánte, obdormívit in
+        Dómino: et via Ardeatína una cum matre et soróre sepúltus est in basílica, quam ipse
+        ædificáverat. Illíus relíquiæ póstea translátæ sunt in ecclésiam sancti Lauréntii, ab
+        ejus nómine in Dámaso vocátam.
+      en: >-
+        Damasus was a Spaniard, a man of eminence and of great learning in the Scriptures, and
+        was elected to the Chair of Peter in the year of our Lord 381; he convoked the First
+        Council of Constantinople, wherein he crushed the wicked heresy of Eunomius and
+        Macedonius. He confirmed the condemnation of the Assembly, at Rimini, which
+        condemnation had already been pronounced by Liberius. This Assembly of Rimini was that
+        in which, to use the language of St. Jerome, Valens and Ursacius brought it about
+        through trickery that the Faith of Nice was abrogated by mob law, and the world
+        afterwards groaned in amazement to find itself Arian.
+
+
+        This Pope built two Basilicas, first, St. Lawrence's, near Pompey's Theatre, which he
+        magnificently enriched, and endowed with houses and farms; and, secondly, another,
+        over the Catacombs on the Road to Ardea. He also consecrated the Platonia, where the
+        bodies of St. Peter and St. Paul lay for some time, and decorated it with elegant
+        inscriptions in poetry composed by himself. He wrote on the subject of virginity both
+        in prose and verse, and likewise many other poems on various subjects.
+
+
+        He ordained that false accusers should be punished for the offences which they had
+        falsely laid to the charge of their neighbours. He established the usage, which
+        already prevailed in many churches, of singing the Psalms, both by day and by night,
+        by alternate choirs, and of adding at the end of each Psalm the words, Glory be to the
+        Father, and to the Son, and to the Holy Ghost. It was at his command that St. Jerome
+        revised the translation of the New Testament to accord with the Greek text. He ruled
+        the Church for seventeen years, two months, and twenty-six days. He held five Advent
+        ordinations, wherein he ordained thirty-one Priests, eleven Deacons, and sixty-two
+        Bishops for diverse Sees. At length he fell asleep in the Lord, in the reign of
+        Theodosius the Elder, aged nearly eighty years, and full of righteousness, truth, and
+        judgment. He was buried beside his mother and sister in the Church which he had himself
+        founded on the Road to Ardea. His reliques were afterwards taken to the Basilica of St.
+        Lawrence, which is thence sometimes called San Lorenzo in Damaso.
+    status: { la: verified, en: verified }