Author Easter Octave Wednesday-Saturday's shared Matins antiphons

All 4 weekdays share the exact same 2 antiphons verbatim ("Jesum qui
crucifíxus est quǽritis, allelúja..." / "Veníte et vidéte locum ubi
pósitus erat Dóminus, allelúja, allelúja."), live-verified against
Pofficium.pl (Monastic Tridentinum 1617, prayMatutinum) across
2026-04-08/09/10/11 — despite each day drawing on a different Gospel
reading in the nocturn-readings pool, the antiphon layer doesn't vary
by day.

Layered onto vu's own already-fixed per-weekday ferial psalm numbers
rather than the reference engine's own differently-sized (Rule of
Benedict summer-contracted) psalm set for these days, consistent with
this project's deliberate rejection of that contraction.

This closes "Easter's own octave" fully: calendar precedence
(2026-09-01), Sunday/Monday/Tuesday's shared proper psalmody, and now
Wednesday-Saturday's antiphons (both 2026-09-02).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X26BkFT3ARbtUGXuBmzUmD

tests/hours/matins.test.ts

@@ -391,12 +391,14 @@ describe('resolveOrdo("matins", ...) Easter Sunday/Monday/Tuesday shared proper
     expect(nocturn3?.text.text.la).toBe('V. Gavísi sunt discípuli, allelúja.\nR. Viso Dómino, allelúja.');
   });
 
-  it('Wednesday-Saturday of the Octave (same winner.id, excluded by `weekdays`) keep the plain 1-nocturn ferial branch unchanged', () => {
+  it('Wednesday-Saturday of the Octave (same winner.id, excluded by the Sunday-side `weekdays`) stay in the plain 1-nocturn ferial branch, same psalm numbers, no Te Deum', () => {
     const ordo = resolveOrdo('matins', '2026-04-08'); // Wednesday of Easter week
     const day = resolveDay('2026-04-08');
     expect(day.winner).toEqual({ kind: 'temporal', id: 'easter-sunday' });
     const psalms = ordo.parts.filter((p) => p.kind === 'psalm').map((p) => (p as { psalmNumber: number }).psalmNumber);
-    // Plain ferial Wednesday table, same as any other Wednesday.
+    // Plain ferial Wednesday psalm numbers, same as any other Wednesday --
+    // only the antiphon layer differs (see the ferial-named-override
+    // describe block below), not the psalmody itself.
     expect(psalms.slice(2)).toEqual(getPsalmsFor('matins', 'wednesday').map((r) => r.number));
     expect(ordo.parts.some((p) => p.kind === 'te-deum')).toBe(false);
   });
@@ -408,6 +410,37 @@ describe('resolveOrdo("matins", ...) Easter Sunday/Monday/Tuesday shared proper
   });
 });
 
+describe('resolveOrdo("matins", ...) Easter Octave Wednesday-Saturday ferial named antiphon override (2026-09-02 fix)', () => {
+  // All 4 weekdays share the exact same 2 antiphons verbatim (live-
+  // verified 2026-04-08/09/10/11) -- own psalm numbers per weekday
+  // unchanged, split evenly across the weekday's own psalm-group count.
+  const EASTER_OCTAVE_WEEKDAYS = ['2026-04-08', '2026-04-09', '2026-04-10', '2026-04-11'] as const;
+
+  it.each(EASTER_OCTAVE_WEEKDAYS)('%s gets the same 2 real antiphons, own weekday psalm numbers unchanged', (date) => {
+    const day = resolveDay(date);
+    expect(day.winner).toEqual({ kind: 'temporal', id: 'easter-sunday' });
+    const ordo = resolveOrdo('matins', date);
+    // Ps 3 + 94 (opening/invitatory) plus this weekday's own real ferial table.
+    const psalms = ordo.parts.filter((p) => p.kind === 'psalm').map((p) => (p as { psalmNumber: number }).psalmNumber);
+    expect(psalms.slice(2)).toEqual(getPsalmsFor('matins', day.weekday as Exclude<typeof day.weekday, 'sunday'>).map((r) => r.number));
+
+    // Only the 2 named-override antiphons appear in the nocturn (skip the
+    // Invitatory's own antiphon, index 0).
+    const antiphons = ordo.parts.filter((p) => p.kind === 'antiphon') as { text: { text: Record<string, string> } }[];
+    const [, first, second] = antiphons;
+    expect(first?.text.text.la).toBe(
+      'Ant. Jesum qui crucifíxus est quǽritis, allelúja; non est hic: surréxit enim, sicut dixit vobis, allelúja.',
+    );
+    expect(second?.text.text.la).toBe('Ant. Veníte et vidéte locum ubi pósitus erat Dóminus, allelúja, allelúja.');
+    expect(antiphons).toHaveLength(3);
+
+    // No Te Deum -- still the 1-nocturn ferial branch, not promoted to 3.
+    expect(ordo.parts.some((p) => p.kind === 'te-deum')).toBe(false);
+    // No stray versicle in the psalmody (same fix as the plain ferial branch).
+    expect(ordo.parts.slice(5).some((p) => p.kind === 'versicle')).toBe(false);
+  });
+});
+
 describe('resolveOrdo("matins", ...) Duplex+ weekday-feast (3-nocturn, non-Sunday) branch', () => {
   // 2026-08-17 -- St. Lawrence's own octave closing day ("In Octava S.
   // Laurentii Martyris ~ Duplex"), live-verified directly against the