Add 6 more April saints previously never added

St. Isidore of Seville, St. Vincent Ferrer, St. Hermenegild, St. Anselm,
St. Fidelis of Sigmaringen, St. Peter Canisius -- April complete.
St. Peter Canisius is the second common-of-a-confessor-doctor saint
(after St. John Damascene in March), same benedictusCommon reuse
pattern. St. Hugh, Abbot (Apr 1) checked and correctly skipped: his own
file is Commemoratio-rank with only a collect, no Lectio content at
all to source.

npm test (365 tests) and tsc --noEmit both pass.

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

src/data/propers/nocturn-readings/st-vincent-ferrer.yml

@@ -0,0 +1,82 @@
+# Matins Nocturn 2 reading for St. Vincent Ferrer, Confessor (Apr 5).
+# Sourced directly from web/www/horas/Latin/Sancti/04-05.txt,
+# English/Sancti/04-05.txt. Lectio4-6 combined into one reading, one
+# continuous vita. No Lectio7-9 in the source (6-lesson office).
+id: st-vincent-ferrer
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Vincentius, honesta stirpe Valentiæ in Hispania natus, ab ineunte ætate cor
+        gessit senile. Qui dum caliginosi hujus sæculi labilem cursum pro ingenii sui
+        modulo consideraret, religionis habitum in ordine Prædicatorum decimo octavo
+        ætatis suæ anno suscepit; et emissa solemni professione, sacris litteris sedulo
+        incumbens, theologiæ lauream summa cum laude consecutus est. Mox obtenta a
+        superioribus licentia, verbum Dei prædicare, Judæorum perfidiam arguere,
+        Saracenorum errores confutare tanta virtute et efficacia cœpit, ut ingentem
+        ipsorum infiddlium multitudinem ad Christi fidem perduxerit, et multa
+        Christianorum millia a peccatis ad pœnitentiam, a vitus ad virtutem revocarit.
+        Electus enim a Deo, ut monita salutis in omnes gentes, tribus et linguas
+        difunderet, et extremi tremendique judicii diem appropinquare ostenderet, omnium
+        auditorum animos terrore concussos, atque a terrenis affectibus avulsos, ad Dei
+        amórem excitabat.
+
+
+        In hoc autem apostolico munere hic vitæ ejus tenor perpetuus fuit quotidie
+        Missam summo mane cum cantu celebravit. Quotidie ad populum concionem habuit;
+        inviolabile semper jejunium, nisi urgens adesset necessitas, servavit; sancta et
+        recta consilia nulli denegavit, carnes numquam comedit, nec vestem lineam
+        induit: populorum jurgia sedavit, dissidentia regna pace composuit: et cum
+        vestis inconsutilis Ecclesiæ diro schismate scinderetur, ut uniretur, et unita
+        servaretur, plurimum laboravit. Virtutibus omnibus claruit, suosque detractores
+        et persecutores, in simplicitate et humilitate ambulans, cum mansuetudine
+        recepit, et amplexus est.
+
+
+        Per ipsum divina virtus, in confirmationem vitæ et prædicationis ejus, multa
+        signa et miracula fecit. Nam frequentissime super ægros manus imposuit, et
+        sanitatem adepti sunt: spiritus immundos e corporibus expulit: surdis auditum,
+        mutis loquelam, cæcis visum restituit, leprosos mundavit, mortuos suscitavit.
+        Senio tandem et morbo confectus infatigabilis Evangelii præco, plurimis Europæ
+        provinciis cum ingenti animarum fructu peragratis, Venetiæ in Britannia minori
+        prædicationis et vitæ cursum feliciter consummavit, anno salutis millesimo
+        quadringentesimo decimo nono: quem Callistus tertius sanctorum numero ascripsit.
+      en: >-
+        This Vincent was born of respectable parents, at Valencia in Spain. Even as a
+        child he had an heart like the heart of an old man. Considering, to the utmost of
+        his young understanding, how fleeting is the course of this dark world, he, in
+        the eighteenth year of his age, took the habit of a Friar in the Order of
+        Preachers. After he had made his solemn profession, he devoted himself to sacred
+        learning, and took the degree of Master in Divinity with much distinction. He
+        soon after received permission from his superiors to preach the word of God, on
+        which duty he entered with such power and success, striving against the
+        unbelief of the Jews, and overthrowing the errors of the Saracens, that he
+        brought an exceeding great multitude of unbelievers to believe in Christ, and
+        turned many thousands of Christians from sin to sorrow, and from vice to virtue.
+        He was a chosen vessel unto God to proclaim the tidings of salvation among all
+        nations, and tribes, and tongues, crying out that the last day, that awful day of
+        judgment, is at hand, smiting consternation into the minds of all, as many as
+        heard him, weaning their love from a perishing world, and turning it to God.
+
+
+        While Vincent wrought the Apostolic work of preaching committed to him, he lived
+        ever as follows: Every morning he sang a solemn Mass, and every day he preached
+        in public. He fasted every day, unless prevented by some absolute necessity. He
+        refused to no one his holy and just advice. He never ate meat, nor wore linen. He
+        quieted public disturbances, and negotiated the peace of kingdoms. When the
+        seamless garment of the Church was rent by an horrid schism, he worked his every
+        nerve to unite it again, and keep it one. He was a burning and a shining light of
+        all virtues, walking always in lowliness and simpleness, so that he meekly
+        welcomed and embraced them which spake evil against him and persecuted him.
+
+
+        The Power of God confirmed his life and doctrine with many great signs and
+        wonders. He often laid his hands upon the sick and they recovered. He cast out
+        unclean spirits, and made the deaf to hear, the dumb to speak, and the blind to
+        see. He cleansed the lepers, and raised the dead. After passing through many
+        countries of Europe with exceeding profit to souls, worn out with age and
+        disease, but still ever the same unwearied herald of the Gospel, he brought his
+        life and his preaching together to an happy end, at Vannes in Brittany, in the
+        year of salvation 1419. Pope Callistus III. numbered him with the Saints.
+    status: { la: verified, en: verified }