Fix Sunday Matins nocturn versicles dropping their R. line

sundayPsalmNocturn/sundayCanticleNocturn only ever rendered a
versicle's V. line, silently missing the responsory for Sunday Matins
and every Duplex+ weekday feast using matins-psalmody-overrides. Both
now share the versicleText helper introduced for the ferial nocturn
antiphons, which combines V./R. into one block.

TODO.md

@@ -2229,10 +2229,16 @@ New `data/hours/matins-ferial-antiphons.yml` (6 weekdays, 5-6 antiphon groups ea
 group per weekday carrying a versicle) + `hours/matins.ts`'s new `ferialAntiphonedNocturn`,
 replacing the old bare `ferialPsalmody` call in the plain-ferial branch (`ferialPsalmody` itself
 stays, still used by `ferialPsalmodyThreeNocturns`'s intentionally antiphon-less fallback).
-Versicle rendered as one combined V./R. block (`"V. ...\nR. ..."`), not just the V. line —
+Versicle rendered as one combined V./R. block (`"V. ...\nR. ..."`) via a new shared
-`sundayPsalmNocturn`'s own versicle handling drops the R. line entirely (only pushes
+`versicleText` helper.
-`group.versicle.v`), which looks like a pre-existing real bug there, not replicated here on
+
-purpose; not yet fixed, since it's Sunday's own code, out of scope for this pass.
+**Follow-up, same day: fixed the pre-existing Sunday versicle bug too.** `sundayPsalmNocturn`/
+`sundayCanticleNocturn` (used by both Sunday Matins and every Duplex+ weekday feast's
+`matins-psalmody-overrides` content) only ever pushed `group.versicle.v` — the V. line — never
+the R. line, so every Sunday/override nocturn versicle has been silently missing its responsory
+since the Sunday psalmody was first authored. Both functions now go through the same
+`versicleText` helper the ferial nocturn code above uses. `tests/hours/matins.test.ts` gained a
+regression test asserting all 3 Sunday nocturn versicles render both lines.
 
 `tests/hours/matins.test.ts` gained a new assertion (on the existing `FERIAL_DATE` proof,
 2026-12-01, Tuesday of Advent I) confirming every nocturn psalm gets its own antiphon,
@@ -2240,8 +2246,8 @@ correctly grouped, and exactly one versicle appears at the right point. Also fix
 Triduum tests that asserted "no versicle part anywhere in the whole ordo" — true only because
 ferial nocturns had no versicles at all before this change; now checks specifically that the
 dropped *opening* versicle (and Ps 3, which it precedes) is gone, via `ordo.parts[0]` being the
-nocturn's own first psalm, rather than asserting zero versicles exist. `npm test` (420 tests)
+nocturn's own first psalm, rather than asserting zero versicles exist. `npm test` (421 tests,
-and `tsc --noEmit` both pass.
+including the Sunday-versicle regression test above) and `tsc --noEmit` both pass.
 
 ## Known, deliberate simplifications (not bugs — working as designed)
 

src/hours/matins.ts

@@ -129,6 +129,17 @@ const ferialAntiphons = matinsFerialAntiphonsData as unknown as MatinsFerialAnti
 
 const NOCTURN_NUMERAL = ['I', 'II', 'III'] as const;
 
+/** Combines a versicle's V. and R. lines into one rendered block — every
+ * nocturn versicle in this file goes through this (previously
+ * `sundayPsalmNocturn`/`sundayCanticleNocturn` only rendered the V. line,
+ * silently dropping the responsory; fixed here, 2026-08-21). */
+function versicleText(versicle: { v: BilingualText; r: BilingualText }): ResolvedText {
+  return verifiedText({
+    la: `V. ${versicle.v.la}\nR. ${versicle.r.la}`,
+    en: `V. ${versicle.v.en}\nR. ${versicle.r.en}`,
+  });
+}
+
 type PsalmPart = Extract<ResolvedPart, { kind: 'psalm' }>;
 
 function plainPsalm(number: number): PsalmPart {
@@ -174,7 +185,7 @@ function sundayPsalmNocturn(group: SundayNocturn, day: LiturgicalDay): ResolvedP
     });
     parts.push({ kind: 'antiphon', text: full });
   }
-  parts.push({ kind: 'versicle', text: verifiedText({ la: group.versicle.v.la, en: group.versicle.v.en }) });
+  parts.push({ kind: 'versicle', text: versicleText(group.versicle) });
   return parts;
 }
 
@@ -197,7 +208,7 @@ function sundayCanticleNocturn(group: SundayNocturn, day: LiturgicalDay): Resolv
     };
   });
   parts.push({ kind: 'antiphon', text: full });
-  parts.push({ kind: 'versicle', text: verifiedText(group.versicle.v) });
+  parts.push({ kind: 'versicle', text: versicleText(group.versicle) });
   return parts;
 }
 
@@ -241,9 +252,7 @@ function ferialPsalmody(day: LiturgicalDay): ResolvedPart[] {
  * per-weekday psalm set). Every psalm-group carries its own antiphon
  * (incipit-or-full opening, same rank rule as Sunday's own nocturns), and
  * exactly one group per weekday carries a versicle+responsory, rendered
- * as one combined V./R. block (not just the V. line — see the sibling
+ * as one combined V./R. block via `versicleText`. */
- * `sundayPsalmNocturn`'s own versicle handling, which drops the R. line
- * entirely; not replicated here on purpose). */
 function ferialAntiphonedNocturn(day: LiturgicalDay): ResolvedPart[] {
   const nocturn = ferialAntiphons[day.weekday as Exclude<Weekday, 'sunday'>];
   const isDouble = isDoubleOrHigher(resolveOfficeWinner(day));
@@ -261,14 +270,7 @@ function ferialAntiphonedNocturn(day: LiturgicalDay): ResolvedPart[] {
     });
     parts.push({ kind: 'antiphon', text: full });
     if (group.versicle) {
-      const { v, r } = group.versicle;
+      parts.push({ kind: 'versicle', text: versicleText(group.versicle) });
-      parts.push({
-        kind: 'versicle',
-        text: verifiedText({
-          la: `V. ${v.la}\nR. ${r.la}`,
-          en: `V. ${v.en}\nR. ${r.en}`,
-        }),
-      });
     }
   }
   return parts;

tests/hours/matins.test.ts

@@ -123,6 +123,16 @@ describe('resolveOrdo("matins", ...) Sunday (3-nocturn) branch', () => {
     expect(ordo.parts.some((p) => p.kind === 'te-deum')).toBe(true);
   });
 
+  it('renders each nocturn versicle with both its V. and R. lines (real bug: sundayPsalmNocturn/sundayCanticleNocturn used to drop the R. line entirely)', () => {
+    const versicles = ordo.parts.filter((p) => p.kind === 'versicle') as { text: { text: Record<string, string> } }[];
+    // Opening Deus-in-adjutorium versicle + one per nocturn (1, 2, 3).
+    expect(versicles).toHaveLength(4);
+    const [, nocturn1, nocturn2, nocturn3] = versicles;
+    expect(nocturn1?.text.text.la).toBe('V. Memor fui nocte nóminis tui Dómine.\nR. Et custodívi legem tuam.');
+    expect(nocturn2?.text.text.la).toBe('V. Média nocte surgébam ad confiténdum tibi.\nR. Super justítia justificatiónis tuæ.');
+    expect(nocturn3?.text.text.la).toBe('V. Exaltáre Dómine in virtúte tua.\nR. Cantábimus et psallémus virtútes tuas.');
+  });
+
   it("resolves the user's own bible-plan reading (Tobit/Sirach) for Nocturn 1", () => {
     const lessons = ordo.parts.filter((p) => p.kind === 'lesson');
     const citations = lessons.map((l) => (l as { text: { citation?: { en?: string } } }).text.citation?.en);