Complete Marian Saturday: proper Matins/Lauds hymns, ferial antiphons

Design (direct instruction): Marian Saturday is its own rank tier,
between simplex and vigil in vu's FeastClass scale -- beats a plain
Simplex saint (commemorated in return), loses cleanly with zero trace
to anything Vigil-or-higher. Deliberately not the full historical
Officium Sabbatorum B.M.V. ("no little office"): ferial psalmody is
kept everywhere, only the antiphons swap to Marian text; Matins and
Lauds each get a real proper Marian hymn; the Marian collect applies
whenever the day wins.

The calendar-side mechanism (calendar/index.ts's applyMarianSaturday)
and a collect/Benedictus antiphon already existed from an earlier
session -- authored what was still missing: matins-hymn-marian-
saturday.yml (Matins had nothing at all) and lauds-{capitulum,
responsory,hymn,versicle}-marian-saturday.yml.

Also found and fixed 3 real bugs from that earlier, unverified pass:
Lauds' own hymn ("O gloriósa Dómina") was sitting under the plain
ferial lauds-hymn-saturday id instead of its own marian-saturday id;
that id's capitulum/responsory/versicle siblings were live-verified
from a different, privileged Lenten Ember Saturday, not a genuine
per-annum ferial Saturday -- corrected to the real content ("Auróra
jam spargit polum" / Rom 13:12-13 / "Sana ánimam meam" / "Repléti
sumus mane misericórdia tua", live-verified against a clean September
Ember Saturday); and the Lauds psalmody override used the real
historical proper psalm set (92/99/62) instead of the ferial one,
rolled back per direct instruction to plain ferial psalms (50, 142,
the split Canticle of Moses) with only the antiphons swapped.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AGjUyhUZJaSjiniEmnLdak

src/data/propers/common/lauds-versicle-saturday.yml

@@ -1,11 +1,11 @@
-# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds live
-# query -- sourced from a Lenten Ember Saturday; see
-# lauds-capitulum-saturday.yml's note on why, and why this is believed
-# genuine per-annum content rather than a Lenten swap.
+# Plain ferial Saturday's own Lauds versicle — live-verified against
+# Divinum Officium (Monastic Tridentinum 1617), Lauds live query,
+# 2025-09-20. See lauds-capitulum-saturday.yml's own header for why this
+# replaces the previous, Lent-sourced content ("Ángelis suis...").
 id: lauds-versicle-saturday
 text:
-  la: "V. Ángelis suis Deus mandávit de te.\nR. Ut custódiant te in ómnibus viis tuis."
-  en: "V. God hath given His Angels charge over thee.\nR. To keep thee in all thy ways."
+  la: "V. Repléti sumus mane misericórdia tua.\nR. Exsultávimus, et delectáti sumus."
+  en: "V. We are filled in the morning with thy mercy.\nR. And we have rejoiced, and are delighted."
 status:
   la: verified
   en: verified