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-nicholas.yml

@@ -0,0 +1,102 @@
+# Matins Nocturn 2 reading for St. Nicholas, Bishop, Confessor
+# (Dec 6) — SanctiM/12-06.txt inherits the whole day (`@Sancti/12-06`)
+# 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/12-06.txt, English/Sancti/12-06.txt.
+# Lectio4-6 combined into one reading, one continuous vita (including
+# the famous three-dowries and three-tribunes episodes), no genuine
+# source break.
+id: st-nicholas
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Nicoláum, illustri loco Pátaræ in Lycia natum, paréntes a Deo precibus impetrarunt.
+        Cujus viri sanctitas quanta futura esset, jam ab incunábulis appáruit. Nam infans, cum
+        réliquos dies lac nutrícis frequens súgeret, quarta et sexta feria semel dumtaxat,
+        idque vesperi sugebat: quam jejunii consuetúdine in réliqua vita semper ténuit.
+        Adoléscens paréntibus orbatus, facultates suas paupéribus distríbuit. Cujus illud
+        insigne est christianæ benignitátis exemplum, quod cum ejus civis egens tres filias
+        jam nubiles in matrimonio collocare non posset, earumque pudicítiam prostitúere
+        cogitaret; re cognita, Nicolaus noctu per fenestram tantum pecuniæ in ejus domum
+        injecit, quantum uníus vírginis doti satis esset: quod cum íterum et tertio fecísset,
+        tres illæ vírgines honestis viris in matrimónium datæ sunt.
+
+
+        Cum vero se totum Deo dedísset, in Palæstinam profectus est, ut loca sancta viseret,
+        et præsens venerarétur. Qua in peregrinatióne navem conscéndens sereno cælo et
+        tranquillo mari, horribilem nautis tempestátem prædixit; moxque ortam, cum essent
+        omnes in summo periculo, orans mirabíliter sedávit. Unde cum domum reversus
+        singuláris sanctitátis ómnibus documénta præberet, Dei admónitu Myram, quæ Lyciæ
+        metropolis erat, venit; quo témpore ejus urbis episcopo mortuo, provinciales epíscopi
+        de successore deligéndo consultábant. Itaque in ea deliberatióne divinitus admoniti
+        sunt, ut eam eligerent, qui postridie mane primus in ecclésiam ingrederétur, Nicolaus
+        nómine. Qua observatióne adhibita, in ecclésiæ janua deprehénsus est Nicoláus, et
+        summo ómnium consénsu Myræ epíscopus creatur. In episcopatu castitátem, quam semper
+        colúerat, gravitátem, oratiónis assiduitátem, vigílias abstinéntiam, liberalitátem et
+        hospitalitátem, in adhortando mansuetúdinem, in reprehendéndo severitátem perpetuo
+        adhibuit.
+
+
+        Viduis et orphanis pecúnia, consílio, ópera non defuit; oppressos adeo sublevávit, ut
+        étiam tres tribunos, per calumniam a Constantino Augusto condemnatos, qui se propter
+        famam ejus miraculórum oratiónibus longíssime absenti commendarant, adhuc vivens, cum
+        imperatóri, mináciter eum terrens, apparuísset, liberaverit. Cum vero contra edictum
+        Diocletiáni et Maximiáni christianæ fidei veritátem Myræ prædicaret, ab imperatórum
+        satellítibus comprehénsus, et longíssime abductus, in carcerem conjéctus est; ubi fuit
+        usque ad Constantinum imperatórem, cujus jussu ex custódia ereptus, Myram rediit. Mox
+        ad Nicænum concílium se cóntulit; ubi cum trecentis illis decem et octo Pátribus
+        Arianam hæresim condemnávit. Inde reversus ad episcopátum, non ita multo post,
+        instante morte, suspíciens in cælum, cum Angelos sibi occurréntes intuerétur, illo
+        Psalmo pronuntiato, In te Dómine, sperávi; usque ad eum locum, In manus tuas
+        comméndo spíritum meum; in cælestem pátriam migrávit. Ejus corpus Bárium in Apulia
+        translátum, ibidem summa celebritate ac veneratióne cólitur.
+      en: >-
+        Nicolas was born at the famous city of Patara in Lycia. His parents obtained him from
+        God by prayer, and the holiness of his life was marked even from the cradle. When he
+        was at the breast he never would suck more than once on Wednesdays and Fridays, and
+        that always after sunset, though he sucked freely on other days. This custom of
+        fasting he never broke through during his whole life. While he was still a young man
+        he lost both his father and mother, after which he gave his whole property away to the
+        poor. One particular example is given of his Christian charity. There was a certain
+        needy man in the city who had three marriageable daughters, for whom he could not get
+        husbands, and so thought to make them harlots. When Nicolas heard of it, he went to
+        the house by night and threw in by the window such a sum of money as made a dowry for
+        one of them. This he did a second and a third time, and thus by his charity they were
+        honourably given in marriage.
+
+
+        When he had given himself entirely to God he set forth for Palestine, that he might
+        see the Holy Places, and worship therein. During this pilgrimage he embarked once on
+        board a ship when the sky was clear and the sea calm, but he foretold a great storm,
+        which afterwards arose and raged until the sailors were afraid; and then the saint by
+        prayer stilled the tempest. After he had returned home, and his holy life was known to
+        all men, God bade him go to Myra, which is the chief city of Lycia, at a time when the
+        Bishop had just died and the Bishops of the Province were called together to choose a
+        successor. While they deliberated, they received a warning from heaven to choose that
+        Nicolas who should first come into the church in the morning. In obedience to that
+        warning, Nicolas was seized at the door of the church, and with universal consent
+        consecrated Archbishop. In his great office he was an unceasing model of purity, as he
+        had always been, of gravity, of regularity in prayer, of watching, of abstinence, of
+        charity, of hospitality, of meekness in exhortation, and of sternness in rebuke.
+
+
+        He was the comforter of widows and orphans by money, by advice, and by labour. He was
+        the deliverer of the oppressed, so mightily, that it is related that the Emperor
+        Constantine once unjustly condemned three Tribunes to death, and these unhappy men
+        called upon Nicolas, though living and absent, to save them, who yet appeared in a
+        vision to the Emperor, and forced him by threats to set them free. When the Emperors
+        Diocletian and Maximian published their edict against Christianity, Nicolas did not
+        cease to preach the truth at Myra, wherefore he was seized by the soldiers of the
+        Emperors, carried away from his See, and thrown into prison, where he remained until
+        the accession of Constantine. This Prince set him free, and he returned to Myra. He
+        betook himself to the first Council of Nicea, where he was one of the 318 Bishops who
+        condemned the heresy of Arius. He returned thence to his Bishopric, and, not long
+        after, became aware of the approach of death. When his last moment was come, he lifted
+        up his eyes to heaven, and, when he saw the Angels coming to meet him, he began to
+        recite the thirtieth Psalm, In thee, O Lord, do I put my trust, and when he had said,
+        Into thy hands I commend my spirit, he passed to the heavenly Fatherland. His body was
+        finally removed to Bari in Apulia, where it is kept with great fame and honour.
+    status: { la: verified, en: verified }