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-john-apostle.yml

@@ -0,0 +1,129 @@
+# Matins Nocturn 2-3 readings for St. John, Apostle and Evangelist
+# (Dec 27) — SanctiM/12-27.txt inherits the whole day (`@Sancti/12-27`)
+# with no Nocturn 2/3 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/12-27.txt, English/Sancti/12-27.txt.
+#
+# Nocturn 2: Lectio4-6 combined into one reading — St. Jerome's account
+# from De Scriptoribus Ecclesiasticis (Lectio4-5) followed by his
+# Commentary on Galatians anecdote of "Little children, love one
+# another" (Lectio6) — genuinely continuous biographical material, no
+# source break worth preserving as a split.
+# Nocturn 3: Lectio7's Gospel citation (John 21:19-24) is a bare
+# incipit ("Et réliqua") with no full pericope text given, so — per
+# the established convention of not transcribing bare incipits — only
+# the homily portion is authored (not marked isGospel), St. Augustine's
+# homily on the two lives (Lectio7's homily + Lectio8-9 combined, one
+# continuous piece).
+id: st-john-apostle
+readings:
+  - nocturn: 2
+    isGospel: false
+    source: "St. Jerome, De Scriptoribus Ecclesiasticis, ch. 9; Commentary on Galatians, Book 3, ch. 6"
+    text:
+      la: >-
+        Joánnes Apóstolus, quem Jesus amávit plúrimum, fílius Zebedǽi, frater Jacóbi
+        Apóstoli, quem Heródes post passiónem Dómini decollávit, novíssimus ómnium scripsit
+        Evangélium, rogátus ab Asiæ epíscopis, advérsus Cerínthum, aliósque hæréticos, et
+        máxime tunc Ebionitárum dogma consúrgens, qui ásserunt Christum ante Maríam non
+        fuísse: unde et compúlsus est divínam ejus nativitátem edícere.
+
+
+        Quarto décimo ígitur anno, secúndam post Nerónem persecutiónem movénte Domitiáno, in
+        Patmos ínsulam relegátus, scripsit Apocalýpsim, quam interpretátur Justínus Martyr et
+        Irenǽus. Interfécto autem Domitiáno, et actis ejus ob nímiam crudelitátem a senátu
+        rescíssis, sub Nerva príncipe rédiit Ephesum: ibíque usque ad Trajánum príncipem
+        persevérans, totas Asiæ fundávit rexítque ecclésias: et conféctus sénio, sexagésimo
+        octávo post passiónem Dómini anno mórtuus, juxta eándem urbem sepúltus est.
+
+
+        Beátus Joánnes Evangelísta, cum Ephesi morarétur usque ad últimam senectútem, et vix
+        inter discipulórum manus ad ecclésiam deferrétur, nec posset in plura vocem verba
+        contéxere; nihil áliud per síngulas solébat proférre colléctas, nisi hoc: Filíoli,
+        dilígite altérutrum. Tandem discípuli et fratres, qui áderant, tǽdio affécti quod
+        éadem semper audírent, dixérunt: Magíster, quare semper hoc lóqueris? Qui respóndit
+        dignam Joánne senténtiam: Quia præcéptum Dómini est; et, si solum fiat, súfficit.
+      en: >-
+        The Apostle John whom Jesus loved was a son of Zebedee, and brother of the Apostle
+        James, who was beheaded by Herod soon after our Lord suffered. He was the last of the
+        Evangelists to write his Gospel, which he published at the request of the Bishops of
+        Asia, against Cerinthus and other heretics, and particularly against the then
+        spreading doctrine of the Ebionites, who asserted that Christ had had no existence
+        before Mary. It was therefore needful for the Evangelist to declare His Eternal and
+        Divine Generation.
+
+
+        In the fourteenth year after Nero, Domitian stirred up the second persecution, and
+        John was exiled to the island of Patmos, where he wrote his Apocalypse, which hath
+        been explained by Justin the Martyr and Irenaeus. When Domitian was killed, the Senate
+        annulled all his acts, on account of his savage cruelty, and the Apostle returned to
+        Ephesus, during the reign of Nerva. He remained at Ephesus until the time of Trajan,
+        and founded and governed all the Churches of Asia. There, in an extreme old age, he
+        died, in the sixty-eighth year after the Lord's passion, and was buried near the city.
+
+
+        The Blessed Evangelist John lived at Ephesus down to an extreme old age, and, at
+        length, when he was with difficulty carried to the Church, and was not able to exhort
+        the congregation at length, he was used simply to say at each meeting, My little
+        children, love one another. At last the disciples and brethren were weary with hearing
+        these words continually, and asked him, Master, wherefore ever sayest thou this only?
+        Whereto he replied to them, (worthy of John,) It is the commandment of the Lord, and
+        if this only be done, it is enough.
+    status: { la: verified, en: verified }
+
+  - nocturn: 3
+    isGospel: false
+    source: "St. Augustine of Hippo, Tractate 124 on John (on John 21:19-24)"
+    text:
+      la: >-
+        Duas vitas sibi divínitus prædicátas, et commendátas novit Ecclésia: quarum est una
+        in fide, áltera in spécie; una in témpore peregrinatiónis, áltera in æternitáte
+        mansiónis; una in labóre, áltera in réquie; una in via, áltera in pátria; una in ópere
+        actiónis, áltera in mercéde contemplatiónis. Una declínat a malo, et facit bonum:
+        áltera nullum habet, a quo declínet, malum; et magnum habet, quo fruátur, bonum. Una
+        cum hoste pugnat; áltera sine hoste regnat.
+
+
+        Una súbvenit indigénti; áltera ibi est, ubi nullum ínvenit indigéntem. Una aliéna
+        peccáta, ut sua sibi ignoscántur, ignóscit; áltera nec pátitur quod ignóscat, nec
+        facit quod sibi poscat ignósci. Una flagellátur malis, ne extollátur in bonis; áltera
+        tanta plenitúdine grátiæ caret omni malo, ut sine ulla tentatióne supérbiæ cohǽreat
+        summo bono.
+
+
+        Ergo una bona est, sed adhuc mísera; áltera mélior, et beáta. Ista significáta est per
+        Apóstolum Petrum, illa per Joánnem. Tota hic ágitur ista usque in hujus sǽculi finem,
+        et illic ínvenit finem; différtur illa complénda post hujus sǽculi finem, sed in
+        futúro sǽculo non habet finem. Ideo dícitur huic: Séquere me. De illo autem: Sic eum
+        volo manére, donec véniam: quid ad te? tu me séquere. Quid enim est hoc? Quantum sápio,
+        quantum cápio, quid est hoc? nisi tu me séquere per imitatiónem perferéndi temporália
+        mala: ille máneat, donec sempitérna vénio redditúrus bona.
+      en: >-
+        The Church knoweth of two different lives, which God hath revealed and blessed: one
+        is the life of faith, the other the life of knowledge; one the life of this
+        pilgrimage, the other the life of the eternal mansions; one the life of work, the
+        other the life of rest; one the life of the journey, the other the life of home; one
+        the life of action, the other the life of contemplation. The one escheweth evil and
+        doeth good; the other hath no evil to eschew, and only an exceeding good to enjoy. The
+        one striveth with the enemy, the other hath no enemies, and reigneth.
+
+
+        The one succoureth the needy; the other is where there are no needy to succour. The
+        one forgiveth them that trespass against it, that its own trespasses may be forgiven;
+        the other neither hath trespasses to forgive nor to be forgiven. The one is chastened
+        with evil, lest it be exalted above measure by good; the other enjoyeth such a fulness
+        of grace that it feeleth no evil, and cleaveth so firmly unto the Highest Good, that it
+        hath no temptation to pride.
+
+
+        Therefore the one is good, but still sorrowful; the other is better and perfectly
+        blessed. And of these two lives there are types, of the one in the Apostle Peter, of
+        the other in John. The one laboureth here even unto the end, and findeth its end
+        hereafter; the other stretcheth out into the hereafter, and in eternity findeth no
+        end. Therefore is it said unto the one, Follow Me; but of the other, If I will that he
+        tarry till I come, what is that to thee? Follow thou Me. What is the meaning of these
+        words? who can know? who can understand? what is it? is it Follow thou Me, imitating
+        Me in the bearing of earthly sorrow; let him tarry till I come again, bringing the
+        everlasting reward?
+    status: { la: verified, en: verified }