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/04-20.yml

@@ -0,0 +1,34 @@
+# Verified against Divinum Officium (Latin Martyrologium, English translation).
+monthDay: "04-20"
+text:
+  la: |
+    Romæ sanctórum Mártyrum Sulpícii et Serviliáni, qui, prædicatióne et miráculis beátæ Domitíllæ Vírginis ad Christi fidem convérsi, ambo, cum nollent idólis immoláre, in persecutióne Trajáni, a Præfécto Urbis Aniáno sunt cápite cæsi.
+
+    Nicomedíæ sanctórum Mártyrum Victóris, Zótici, Zenónis, Acíndyni, Cæsárei, Severiáni, Chrysóphori, Theónæ et Antoníni, qui, sub Diocletiáno Imperatóre, passióne ac signis beáti Geórgii ad Christum convérsi sunt, et ob intrépidam fídei confessiónem, várie tentáti, martýrium complevérunt.
+
+    Tomis, in Scýthia, sancti Theótimi Epíscopi, quem, ob insígnem ipsíus sanctitátem atque mirácula, étiam infidéles bárbari veneráti sunt.
+
+    Ebredúni, in Gálliis, sancti Marcellíni, qui fuit primus ejúsdem urbis Epíscopus. Hic, Dei mónitu, cum sanctis Sóciis Vincéntio et Domníno, ex Africa venit, et máximam Alpium maritimárum partem verbo et signis admirándis, quibus usque hódie refúlget, ad Christi fidem convértit.
+
+    Antisiodóri sancti Marciáni Presbýteri.
+
+    Apud Constantinópolim sancti Theodóri Confessóris, ab áspera cilícii veste, qua tegebátur, cognoménto Tríchinas, qui multis virtútibus, præsértim advérsus dǽmones, cláruit; ex cujus córpore scatúriens unguéntum ægrótis sanitátem impértit.
+
+    In Monte Politiáno, in Túscia, sanctæ Agnétis Vírginis, ex Ordine sancti Domínici, miráculis claræ.
+  en: |
+    At Rome, the holy martyrs Sulpitius and Servilian. They were converted to the faith of Christ by the preaching and miracles of the blessed Virgin Domitilla, and were put to death by Anian, Prefect of the city, in the persecution under the Emperor Trajan, for refusing to offer sacrifice to idols.
+
+    Upon the same day, the holy martyrs Victor, Zoticus, Zeno, Acindinus, Caesareus, Severian, Chrysophor, Theonas, and Antonine, who were variously tried under the Emperor Diocletian, and attained to martyrdom, [most likely in Nicomedia.]
+
+    At Tomi, in Scythia, holy Theotimus, [Bishop of that see, about the year 409,] whose holiness and miracles were so striking that he was honoured even by the unbelieving savages.
+
+    At Embrun, in Gaul, holy Marcellinus, the first Bishop of that city, who came from Africa in consequence of a warning from God, along with his holy companions Vincent and Domninus, and by his word and the wondrous signs, for which he is famous even unto this day, brought to believe in Christ a great number of the dwellers on the Seaward Alps, [in the year 374.]
+
+    At Auxerre, [in the fifth century,] the holy Priest Marcian.
+
+    On the same day, the holy Confessor Theodore, nicknamed "Hairy" on account of the rough sackcloth garment which he wore. He is famous for many mighty works, more especially against evil spirits and from his body there floweth an ointment whereby the sick are healed. [He was of a noble family of Constantinople. His date is not known exactly, but it was certainly after the persecution of Diocletian. He lived in a desert in Thrace, which is called after him, the Hairy Desert]
+
+    At Monte Pulciano, [in the year 1317,] the holy Virgin Agnes, of the Order of St. Dominic, famous for miracles.
+status:
+  la: verified
+  en: verified