Prime: real content (psalms, Martyrology, Regula) and ordo corrections

Pulls in verified content from Divinum Officium rather than placeholders:
17 psalms (2, 6, 7-19, 118, 129), 365 days of the Martyrology, and the full
121-reading Regula cycle, plus the Athanasian Creed.

Ordo corrections driven by review against the real engine output:
- Capitulum and Preces now pick a Sunday/feast vs. ferial form
  (calendar/isSundayOrFeast); ferial Preces said every ferial day by choice.
- Chapter responsory, hymn doxology, and the opening versicle's
  Alleluia/Laus tibi all vary by season via a shared resolver
  (hours/seasonal-propers.ts).
- Real Roman Kalends/Nones/Ides Latin dating (calendar/roman-date.ts,
  verified against 363/365 real Martyrology headings) plus the historical
  "bis sextus" Feb 29 handling, and the Martyrology's Luna (moon-day)
  heading (a ported Golden-Number calculation).
- Fixed responsory structure (was missing its initial full repeat),
  weekday psalm antiphons (opening as incipit-or-full by rank, full
  repeat after the psalms/Creed as its own part, "*" chant mark kept),
  scripture citations on the capitulum/lectio brevis, and V./R. markers
  switched from Unicode symbols to plain text for reliable font rendering.
- Dropped Pretiosa and the dead-commemoration psalm (129) for time;
  trimmed section headings down to the ones that are actually named
  things (Preces, Chapter Office, etc. no longer relabel connective text).

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

src/data/martyrology/05-21.yml

@@ -0,0 +1,44 @@
+# Verified against Divinum Officium (Latin Martyrologium, English translation).
+monthDay: "05-21"
+text:
+  la: |
+    Sancti Valéntis Epíscopi, qui, una cum tribus púeris, necátus est.
+
+    Alexandríæ commemorátio sanctórum Mártyrum Secúndi Presbýteri, et aliórum; quos sacris diébus Pentecóstes, sub Constántio Imperatóre, Ariánus Epíscopus Geórgius sævíssime occídi præcépit.
+
+    In Mauritánia Cæsariénsi natális sanctórum Mártyrum Diaconórum Timóthei, Pólii et Eutýchii, qui, in eádem regióne disseminántes verbum Dei, páriter coronári meruérunt.
+
+    Cæsaréæ, in Cappadócia, item natális sanctórum Mártyrum Polyeúcti, Victórii et Donáti.
+
+    Córdubæ, in Hispánia, sancti Secundíni Mártyris.
+
+    Eódem die sanctórum Mártyrum Synésii et Theopómpi.
+
+    Cæsaréæ Philíppi natális sanctórum Mártyrum Nicostráti et Antíochi Tribunórum, cum áliis milítibus.
+
+    Alexandríæ commemorátio sanctórum Episcopórum et Presbyterórum; qui, ab Ariánis exsílio relegáti, sanctis Confessóribus sociári meruérunt.
+
+    Níciæ, apud Varum flúvium, sancti Hospítii Confessóris, abstinéntiæ virtúte ac prophetíæ spíritu insígnis.
+  en: |
+    _
+
+    In Morocco, the holy Deacons Timothy, Polius, and Eutychius, who spread the Word of God in that country, and won the crown of martyrdom together.
+
+    At Caesarea, in Cappadocia, the holy martyrs Polyeuctus, Victorius, and Donatus.
+
+    At Cordova, [in the persecution under the Emperor Decius,] the holy martyr Secundinus.
+
+    Upon the same day, [at Nicomedia, in the persecution under the Emperor Diocletian,] the holy martyrs Synesius and Theopompus.
+
+    At Caesarea Philippi, [likewise in the persecution under the Emperor Diocletian,] the holy Nicostratus and Antiochus, along with other soldiers, all martyrs.
+
+    On the same day, the holy Valens, Bishop [of Pampeluna,] who was murdered along with three lads.
+
+    At Alexandria, are commemorated the holy martyrs Secundus the Priest, and others, whom George, the Arian Bishop under the Emperor Constantius, savagely ordered to be slain during the Whitsuntide holidays.
+
+    Also the holy Bishops [Ammonius, Muus, Gaius, Philon, Heres, Pliny, Psinosiris, Palemon, Agathon, Anagamphon, Mark, another Ammonius, another Mark, Dracontius, Adelphius, and Athenodorus,] and the Priests [Hierax and Dioscorus,] who all were banished by the Arians, and so won a place with holy Confessors.
+
+    At Nice, in Gaul, [in the sixth century,] the holy Confessor Hospitius, remarkable for the grace of self-denial, and for the spirit of prophecy.
+status:
+  la: verified
+  en: verified