Author St. Felix I Matins reading; close two fixed-octave-day gaps

Re-auditing the two prior sanctoral bulk passes (pre-1955 Tridentine track
and SanctiM Monastic-1617 track) turned up one saint missed by both:
St. Felix I (May 30), authored the same single-lesson shape as
st-pontian.yml. This closes the saint-level side of the Matins
patristic/hagiographic reading backlog.

Separately, auditing octave-day content by calendar date (the reference
engine keys it that way, not by octave-day-number) found two real gaps in
already-partially-authored fixed-date octaves: Immaculate Conception's own
closing day (Dec 15, Pius IX bull + St. Epiphanius homily) and Nativity of
the BVM's day 3 (Sep 10, St. Jerome on Matthew's genealogy -- no usable
reference English, own translation used, draft). Every other apparent gap
in these octaves was confirmed a correctly-empty vide-only day, not a
further gap.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PhysogLP9eCeKS7JEwRi6y

src/data/propers/nocturn-readings/st-felix-i.yml

@@ -0,0 +1,31 @@
+# Matins Nocturn 2 reading for St. Felix I, Pope, Martyr (May 30).
+# No genuine SanctiM match: the only SanctiM file at this date,
+# `SanctiM/05-30b.txt`, is St. Joan of Arc's — a different feast
+# sharing the date, not a Felix I override — so this is a missed
+# pre-1955-pool candidate (Sancti-only, no SanctiM of its own), same
+# shape as the two pool passes recorded in memory
+# vu-matins-pre1955-saints / vu-matins-sanctim-saints.
+# web/www/horas/Latin/Sancti/05-30.txt, English/Sancti/05-30.txt.
+# Single lesson (simplex-feast Lectio93), one continuous account, no
+# responsory given in the source.
+id: st-felix-i
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Felix Románus, patre Constántio, Aureliáno imperatóre præfuit Ecclésiæ. Constítuit ut
+        Missa supra memórias et sepúlcra Mártyrum celebrarétur. Qui cum mense Decémbri
+        habuísset ordinatiónes duas, et creásset presbýteros novem, diáconos quinque,
+        epíscopos per divérsa loca quinque, martyrio coronátus, via Aurelia sepelítur in
+        basílica quam a se ædificátam dedicárat. Vixit in pontificátu annos duos, menses
+        quátuor, dies vigínti novem.
+      en: >-
+        Pope Felix I was a Roman who ruled the Church in the days of the Emperor Aurelian.
+        His father's name was Constantius. His is the ordinance which commands that Mass
+        should be celebrated on the monuments and graves of martyrs. He held two December
+        ordinations, wherein he ordained nine Priests, five Deacons, and five Bishops for
+        diverse places. Having finished his testimony he was buried upon the Aurelian Way, in
+        the Church which he had himself built and dedicated. He lived as Pope two years, four
+        months, and twenty-nine days.
+    status: { la: verified, en: verified }