Wire the flexa mark into every hour's psalm-antiphon pairing

Every psalm's opening antiphon (Lauds, Prime, Terce, Sext, None,
Vespers, Compline's callers, Matins) now runs through applyFlexaMark,
marking the boundary in both the displayed antiphon and the psalm's
first verse — e.g. today's Sunday Matins Nocturn 1: "Ant. The king
rejoices ‡" / "The king rejoices ‡ in thy strength, O Lord...".
Live-verified against the reference engine's own rendering for Ps 20.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UCvvgFLrhXNVFUThz6kanw

src/hours/matins.ts

@@ -69,7 +69,7 @@ import { getPsalmVerses } from '../psalter';
 import { getPsalmsFor, type PsalmRef } from '../psalter/distribution';
 import { getScriptureVerses } from '../scripture';
 import { getOpeningVersicleId } from './opening-versicle';
-import { isDoubleOrHigher } from './antiphon';
+import { isDoubleOrHigher, applyFlexaMark } from './antiphon';
 import {
   resolveCommon,
   getDayCollect,
@@ -150,6 +150,15 @@ function plainPsalm(number: number): PsalmPart {
   };
 }
 
+/** `plainPsalm` plus the given antiphon, with the flexa mark (see
+ * hours/antiphon.ts's `applyFlexaMark`) applied to the first verse against
+ * that antiphon — a no-op when `antiphon` is undefined. */
+function psalmPartWithAntiphon(number: number, rawAntiphon: ResolvedText | undefined): PsalmPart {
+  const base = plainPsalm(number);
+  const { verses, antiphon } = applyFlexaMark(base.verses, rawAntiphon);
+  return { ...base, antiphon, verses };
+}
+
 function psalmRefParts(refs: PsalmRef[]): ResolvedPart[] {
   return refs.map((ref) => ({
     kind: 'psalm' as const,
@@ -167,7 +176,7 @@ function invitatoryParts(day: LiturgicalDay): ResolvedPart[] {
   const { incipit, full } = splitNamedAntiphon(resolveCommon('matins-invitatory-antiphon'));
   const opening = isDoubleOrHigher(resolveOfficeWinner(day)) ? full : incipit;
   return [
-    { ...plainPsalm(94), antiphon: opening },
+    psalmPartWithAntiphon(94, opening),
     { kind: 'antiphon', text: full },
   ];
 }
@@ -181,7 +190,7 @@ function sundayPsalmNocturn(group: SundayNocturn, day: LiturgicalDay): ResolvedP
     const { incipit, full } = splitNamedAntiphon(verifiedText(g.antiphon));
     const opening = isDoubleOrHigher(resolveOfficeWinner(day)) ? full : incipit;
     g.psalms.forEach((n, i) => {
-      parts.push({ ...plainPsalm(n), antiphon: i === 0 ? opening : undefined });
+      parts.push(psalmPartWithAntiphon(n, i === 0 ? opening : undefined));
     });
     parts.push({ kind: 'antiphon', text: full });
   }
@@ -282,11 +291,13 @@ function ferialAntiphonedNocturn(day: LiturgicalDay): ResolvedPart[] {
     const { incipit, full } = splitNamedAntiphon(verifiedText(group.antiphon));
     const opening = isDouble ? full : incipit;
     group.psalms.forEach((ref, i) => {
+      const rawVerses = getPsalmVerses(ref.number, ref.verses).map((v): ResolvedVerse => ({ n: v.n, text: v.text, status: v.status }));
+      const { verses, antiphon } = applyFlexaMark(rawVerses, i === 0 ? opening : undefined);
       parts.push({
         kind: 'psalm',
         psalmNumber: ref.number,
-        verses: getPsalmVerses(ref.number, ref.verses).map((v): ResolvedVerse => ({ n: v.n, text: v.text, status: v.status })),
-        antiphon: i === 0 ? opening : undefined,
+        verses,
+        antiphon,
       });
     });
     parts.push({ kind: 'antiphon', text: full });