calendar: model Our Lady's Saturday as a real occurrence outcome

On a free Saturday (nothing privileged already claims it, no active
octave), the day's own identity is now "Our Lady's Saturday" rather
than an anonymous ordinary-feria -- mirrors privileged-feria-minor
exactly, per direct instruction: Semiduplex-or-higher still wins
outright (Marian Saturday doesn't apply at all); below that (Simplex,
and Vigil, both under semiduplex on the FeastClass scale) loses and is
commemorated instead. Layered additively after decideOccurrence, same
shape as applyOctaves -- never touches decideOccurrence's own rules.

Needed a real winner identity (not just the plain temporal feria id)
so day-label/antiphon/collect sourcing can recognize it -- added a
temporal-feasts record purely for that, and taught getDayLabel to
check it for any named temporal winner (a small, free improvement for
Christmas/Pentecost's own labels too, previously unhandled).

hours: build the duplex-majus+ Lauds psalmody override (per-feast)

lauds-psalmody no longer unconditionally uses the plain weekday
default: a duplex-majus-or-higher sanctoral winner, or Our Lady's
Saturday (unconditional, no rank threshold -- it isn't competing with
the weekday default the way a saint is), now substitutes its own
proper psalm groups/antiphons/canticle. Per-feast, not per-Common, per
direct instruction, even though most duplex-majus+ saints across the
year don't have one authored yet and fall back to the plain weekday
default until they do.

Content for the worked example (St. Lawrence's own day) surfaced a
real bug while sourcing it: st-lawrence-antiphon.yml had been read
from the Roman/secular rite's own [Ant 1], not Monastic 1617's actual
Benedictus antiphon for that day -- corrected from a fresh live query.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/calendar/marian-saturday.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from 'vitest';
+import { resolveDay } from '../../src/calendar';
+import { getDayLabel } from '../../src/calendar/day-label';
+
+// Direct instruction: on a free Saturday, "Our Lady's Saturday" mirrors
+// privileged-feria-minor exactly — Semiduplex-or-higher still wins
+// outright (Marian Saturday doesn't happen); below that (Simplex, and
+// Vigil, since both are below semiduplex in the FeastClass scale), the
+// saint loses and is commemorated instead.
+describe('Marian Saturday (applyMarianSaturday)', () => {
+  it('wins outright, with no commemoration, on a Saturday with nothing else at all going on', () => {
+    const day = resolveDay('2026-10-24');
+    expect(day.winner).toEqual({ kind: 'temporal', id: 'marian-saturday' });
+    expect(day.commemorations).toEqual([]);
+    expect(getDayLabel(day)).toBe("Our Lady's Saturday");
+  });
+
+  it('wins over a Simplex saint, who is commemorated instead of winning outright', () => {
+    const day = resolveDay('2026-06-20'); // St. Silverius, Pope and Martyr, Simplex
+    expect(day.winner).toEqual({ kind: 'temporal', id: 'marian-saturday' });
+    expect(day.commemorations).toEqual([
+      { kind: 'sanctoral', id: 'st-silverius', name: 'St. Silverius, Pope and Martyr', rank: 'simplex' },
+    ]);
+  });
+
+  it('wins over a Vigil too (below semiduplex, same as Simplex) -- can commemorate more than one loser at once', () => {
+    const day = resolveDay('2025-11-29'); // St. Saturninus (Simplex) + Vigil of St. Andrew
+    expect(day.winner).toEqual({ kind: 'temporal', id: 'marian-saturday' });
+    expect(day.commemorations).toEqual([
+      { kind: 'sanctoral', id: 'st-saturninus', name: 'St. Saturninus, Martyr', rank: 'simplex' },
+      { kind: 'sanctoral', id: 'vigil-of-st-andrew', name: 'Vigil of St. Andrew', rank: 'vigil' },
+    ]);
+  });
+
+  it('loses outright to a Semiduplex-or-higher saint -- Marian Saturday does not apply at all', () => {
+    const day = resolveDay('2026-09-19'); // St. Januarius, Semiduplex
+    expect(day.winner).toEqual({
+      kind: 'sanctoral',
+      id: 'st-januarius',
+      name: 'St. Januarius, Bishop, and Companions, Martyrs',
+      rank: 'semiduplex',
+    });
+  });
+
+  it('never applies to a Saturday with real standing of its own (privileged season, Ember days, ...)', () => {
+    const day = resolveDay('2026-02-28'); // Lenten Ember Saturday
+    expect(day.winner).not.toEqual({ kind: 'temporal', id: 'marian-saturday' });
+    expect(day.temporalCategory).toBe('privileged-feria');
+  });
+
+  it('never applies while an octave is active, even on an otherwise-eligible Saturday (Pentecost Ember Saturday stays governed by its octave)', () => {
+    const day = resolveDay('2026-05-30');
+    expect(day.winner).toEqual({ kind: 'temporal', id: 'pentecost-sunday' });
+  });
+
+  it('never applies on a weekday other than Saturday', () => {
+    const day = resolveDay('2026-10-23'); // the Friday before the clean Marian Saturday above
+    expect(day.winner).not.toEqual({ kind: 'temporal', id: 'marian-saturday' });
+  });
+});