Add September Matins readings for SanctiM-track saints

All 9 of September's SanctiM-track saints authored -- the first full
month in this pass with nothing left unsourced. Includes the
Dedication of St. Michael the Archangel, whose SanctiM file borrows
structure from his separate May 8 Apparition file but still resolves
its actual readings back to this day's own Tridentine content.

src/data/propers/nocturn-readings/nativity-bvm.yml

@@ -0,0 +1,67 @@
+# Matins Nocturn 2 reading for the Nativity of the B.V.M. (Sep 8) —
+# SanctiM/09-08.txt inherits the whole day (`@Sancti/09-08`) 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/09-08.txt, English/Sancti/09-08.txt.
+# Lectio4-6 combined into one reading, one continuous excerpt of St.
+# Augustine's sermon. No responsory given in the source for these
+# lessons.
+id: nativity-bvm
+readings:
+  - nocturn: 2
+    isGospel: false
+    source: "St. Augustine, Bishop of Hippo, Sermon 18 on the Saints"
+    text:
+      la: >-
+        Adest nobis, dilectíssimi, optátus dies beátæ ac venerábilis semper Vírginis Maríæ;
+        ídeo cum summa exsultatióne gáudeat terra nostra, tantæ Vírginis illustráta natáli. Hæc
+        est enim flos campi, de qua ortum est pretiósum lílium convállium, per cujus partum
+        mutátur natúra protoplastórum, delétur et culpa. Præcísum est in ea illud Hevæ
+        infelicitátis elógium, quo dícitur: In dolóre páries fílios tuos; quia ista in lætítia
+        Dóminum péperit.
+
+
+        Heva enim luxit, ista exsultávit: Heva lácrimas, María gáudium in ventre portávit;
+        quia illa peccatórem, ista édidit innocéntem. Mater géneris nostri pœnam íntulit mundo,
+        Génetrix Dómini nostri salútem íntulit mundo. Auctrix peccáti Heva, auctrix mériti
+        María. Heva occidéndo óbfuit, María vivificándo prófuit. Illa percússit, ista sanávit.
+        Pro inobediéntia enim obediéntia commutátur, fides pro perfídia compensátur.
+
+
+        Plaudat nunc órganis María, et inter velóces artículos týmpana puérperæ cóncrepent.
+        Cóncinant lætántes chori, et alternántibus módulis dulcísona cármina misceántur.
+        Audíte ígitur, quemádmodum tympanístria nostra cantáverit; ait enim: Magníficat ánima
+        mea Dóminum: et exsultávit spíritus meus in Deo, salutári meo. Quia respéxit
+        humilitátem ancíllæ suæ: ecce enim ex hoc beátam me dicent omnes generatiónes. Quia
+        fecit mihi magna qui potens est. Causam ígitur invalescéntis erráti, miráculum novi
+        partus evícit; et Hevæ planctum Maríæ cantus exclúsit.
+      en: >-
+        Dearly beloved brethren, the day for which we have longed, the Feast-day of the Blessed
+        and Worshipful and Ever-Virgin Mary, that day is come. Let our land laugh and sing with
+        merriment, bathed in the glory of this great Virgin's rising. She is the flower of the
+        fields on which the priceless lily of the valleys hath blossomed. This is she whose
+        delivery changed the nature that we draw from our first parents, and cleansed away their
+        offence. At her that dolorous sentence which was pronounced over Eve ended its course; to
+        her it was never said: In sorrow thou shalt bring forth children. She brought forth a
+        Child, even the Lord, but she brought Him forth, not in sorrow, but in joy.
+
+
+        Eve wept, but Mary laughed. Eve's womb was big with tears, but Mary's womb was big with
+        gladness. Eve gave birth to a sinner, but Mary gave birth to the sinless One. The mother
+        of our race brought punishment into the world, but the Mother of our Lord brought
+        salvation into the world. Eve was the foundress of sin, but Mary was the foundress of
+        righteousness. Eve welcomed death, but Mary helped in life. Eve smote, but Mary healed.
+        For Eve's disobedience, Mary offered obedience, and for Eve's unbelief, Mary offered
+        faith.
+
+
+        Let Mary now make a loud noise upon the organ, and between its quick notes let the
+        rattling of the Mother's timbrel be heard. Let the gladsome choirs sing with her, and
+        their sweet hymns mingle with the changing music. Hearken to what a song her timbrel
+        will make accompaniment. She saith: My soul doth magnify the Lord, and my spirit hath
+        rejoiced in God my Saviour. For He hath regarded the lowliness of His hand-maiden, for,
+        behold, from henceforth all generations shall call me blessed; for He That is Mighty
+        hath done to me great things. The new miracle of Mary's delivery hath effaced the curse
+        of the frail backslider, and the singing of Mary hath silenced the wailing of Eve.
+    status: { la: verified, en: verified }