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/terce.ts

@@ -5,7 +5,7 @@ import { getDayLabel } from '../calendar/day-label';
 import { getPsalmsFor } from '../psalter/distribution';
 import { getPsalmVerses } from '../psalter';
 import { getOpeningVersicleId } from './opening-versicle';
-import { isDoubleOrHigher } from './antiphon';
+import { isDoubleOrHigher, applyFlexaMark } from './antiphon';
 import {
   resolveCommon,
   getDayCollect,
@@ -40,12 +40,16 @@ function resolvePart(part: HourPart, day: LiturgicalDay): ResolvedPart[] {
       const psalmRefs = getPsalmsFor('terce', day.weekday);
       const { incipit, full } = splitNamedAntiphon(resolveMinorHourAntiphon('terce', day, antiphons[day.weekday]));
       const opening = isDoubleOrHigher(resolveOfficeWinner(day)) ? full : incipit;
-      return psalmRefs.map((ref, i) => ({
-        kind: 'psalm' as const,
-        psalmNumber: ref.number,
-        antiphon: i === 0 ? opening : undefined,
-        verses: getPsalmVerses(ref.number, ref.verses).map((v) => ({ n: v.n, text: v.text, status: v.status })),
-      }));
+      return psalmRefs.map((ref, i) => {
+        const rawVerses = getPsalmVerses(ref.number, ref.verses).map((v) => ({ n: v.n, text: v.text, status: v.status }));
+        const { verses, antiphon } = applyFlexaMark(rawVerses, i === 0 ? opening : undefined);
+        return {
+          kind: 'psalm' as const,
+          psalmNumber: ref.number,
+          antiphon,
+          verses,
+        };
+      });
     }
     // Not used by Terce.
     case 'prayer':