Add February Matins readings for SanctiM-track saints

8 of February's 10 SanctiM-track saints authored (2 left unsourced —
Common-only, no proper text in the source). Two more turned out to be
missed pre-1955-pool candidates rather than genuine SanctiM cases
(their date's SanctiM file belongs to a different saint sharing the
date). Also settles a convention for bare Gospel incipits followed by
a real homily: author the homily alone as isGospel:false rather than
including the incipit line under isGospel:true.

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

@@ -0,0 +1,33 @@
+# Matins Nocturn 2 reading for St. Simeon, Bishop and Martyr (Feb 18) —
+# no genuine SanctiM/02-18*.txt: the only file found there,
+# `SanctiM/02-18b.txt`, is unrelated content for St. Bernadette
+# Soubirous (a later addition to that date slot, not referencing
+# Simeon or `@Sancti/02-18` at all) — same "the file that exists isn't
+# necessarily yours" wrinkle as the pre-1955 pass (memory
+# vu-matins-pre1955-saints); Simeon turns out to be a missed
+# pre-1955-pool candidate rather than a genuine SanctiM case (see
+# memory vu-matins-sanctim-saints).
+# web/www/horas/Latin/Sancti/02-18.txt, English/Sancti/02-18.txt.
+# Single lesson (simplex-feast Lectio93), one continuous account, no
+# responsory given in the source.
+id: st-simeon
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Simeon, fílius Cléophæ, post Jacobum próximus Jerosolymis ordinátus epíscopus, Trajano
+        imperatóre apud Atticum consularem est accusatus, quod christianus esset et Christi
+        propinquus. Comprehendebántur enim omnes eo témpore, quicúmque ex genere David orti
+        essent. Quare multis cruciátus tormentis eodem passiónis genere, quod Salvátor noster
+        subíerat, affícitur: mirántibus ómnibus, quod homo ætate confectus (erat enim centum et
+        viginti annórum) acerbíssimos crucis dolóres fortiter constanterque paterétur.
+      en: >-
+        Simeon, the son of Cleophas, was chosen the second Bishop of Jerusalem, being the first
+        after James. Under the Emperor Trajan he was accused before the Pro-Consul Atticus, as
+        being both a Christian and a relation of Christ, this being the time when all were
+        arrested that were of the lineage of David. He underwent with great suffering the same
+        things that were inflicted on our Saviour, and all men marvelled to see with how great
+        boldness and firmness he endured the grievous torment of the cross, at his great age, for
+        he was an hundred and twenty years old.
+    status: { la: verified, en: verified }