Add January Matins readings for pre-1955 sanctoral saints

Sts. Marcellus I, Paul the Hermit, Marius/Martha/Audifax/Abachum,
Emerentiana, Timothy, Polycarp, and Agnes (second feast) — sourced from
the reference engine's Tridentine/Divino Afflatu track since none of
these saints existed in the Monastic 1617 calendar this app otherwise
follows.

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

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

@@ -0,0 +1,27 @@
+# Matins Nocturn 2 reading for St. Emerentiana, Virgin and Martyr (Jan 23)
+# — pre-1955-but-post-1617. Plain Sancti/01-23.txt is a different, later
+# saint (St. Raymond of Peñafort) who displaced Emerentiana on the
+# general calendar's own Jan 23 slot; her own content survives at the
+# suffixed sibling file instead (see memory vu-matins-pre1955-saints's
+# "critical wrinkle").
+# web/www/horas/Latin/Sancti/01-23o.txt, English/Sancti/01-23o.txt.
+# Single lesson (simplex-feast Lectio93), one continuous account, no
+# responsory given in the source.
+id: st-emerentiana
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Emerentiána virgo Romana, collactanea beátæ Agnetis, adhuc catechumena, fide et caritate
+        flagrans, furéntes in Christiános idolórum cultores cum vehementius accusaret, a concitáta
+        multitúdine lapidibus óbruta est. Quæ in cruciátibus orans ad sepúlcrum sanctæ Agnetis,
+        proprio sánguine, quem pro Christo constanter effudit, baptizata, ánimam Deo réddidit.
+      en: >-
+        Emerentiana was a Roman maiden, and the foster-sister of the blessed Agnes. While she was
+        still a Catechumen she was inspired by her faith and love to rebuke the fury of the
+        idol-worshippers against the Christians, whereupon a mob assembled, and stoned her so
+        severely that she was only able to drag herself to the grave of holy Agnes, where, while
+        she prayed, she gave up her soul to God, being baptized, not in water, but in her own
+        blood, so freely shed for Christ.
+    status: { la: verified, en: verified }