Build the Vespers ordo: mechanism, weekday content, seasonal content

Wires resolveOrdo('vespers', ...) end to end: opening versicle,
weekday psalmody (4 groups, handling the joined Ps 115+116 and the
split Ps 138/143 via a PsalmRef-like shape), the chapter/responsory/
hymn/versicle office bundle, Magnificat, day-collects — reusing
resolveEveningDay so First/Second Vespers precedence and the cross-day
commemoration (both added in the previous commit) apply automatically
— and a closing that reuses Lauds' own conclusio, since no distinct
"Vespera" version of that exact text turned up in the source.

getMagnificatAntiphon mirrors getBenedictusAntiphon's saint/temporal-id
lookup order, but also falls back to real content Benedictus has no
equivalent of: the classic ferial set that quotes the Magnificat's own
text in sequence across the week, with the correct Monastic-rubric
variant picked for Tue/Thu/Fri/Sat (two of those needed a fresh
translation where the Monastic Latin diverges from the given English
in content, not just wording).

Also includes Vespers' own seasonal content (Advent/Lent/Passiontide/
Paschaltide chapter+responsory+hymn+versicle), transcribed from the
same source blocks as the weekday content, with the Monastic-specific
hymn variants hand-applied from the source's substitution notation
against each base Roman text (one transcription slip caught and fixed
mid-pass: the Passiontide hymn's closing lines had been copied from
the Roman text instead of the Monastic one actually being
transcribed). Passiontide's own responsory/hymn correctly omit the
Gloria Patri, matching real rubric and the source data as given.

All weekday/seasonal content marked `draft`, not `verified` — read
directly from the reference source, not cross-checked against a live
rendering per day the way the psalmody was.

Six other hours' resolvePart switches needed the three new HourPart
kinds ('vespers-psalmody', 'vespers-office', 'magnificat') added to
their exhaustive not-used lists so they still typecheck; three
pre-existing tests assumed Vespers was still "coming soon" and are
updated to exercise Matins (still the genuine stub) instead.

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

src/data/propers/common/vespers-hymn-saturday.yml

@@ -0,0 +1,43 @@
+# Sourced from Divinum Officium's Monastic block ("[HymnusM Vespera]" in
+# Latin/TemporaM/Pent01-0.txt, referenced from "[HymnusM Day6 Vespera]" =
+# "@Tempora/Pent01-0:HymnusM Vespera" in Psalterium/Special/Major
+# Special.txt) — full separate Monastic text this time ("O lux beáta
+# Trínitas"), not a substitution against a base hymn. Not
+# live-query-verified (see TODO.md) — read directly from source.
+id: vespers-hymn-saturday
+text:
+  la: |
+    O lux beáta Trínitas,
+    Et principális Únitas,
+    Jam sol recédit ígneus,
+    Infúnde lumen córdibus.
+
+    Te mane laudum cármine,
+    Te deprecémur véspere:
+    Te nostra supplex glória
+    Per cuncta laudet sǽcula.
+
+    Deo Patri sit glória,
+    Ejúsque soli Fílio,
+    Cum Spíritu Paráclito,
+    Et nunc, et in perpétuum.
+    Amen.
+  en: |
+    O Trinity of blessed Light,
+    O Unity of sovereign might,
+    as now the fiery sun departs,
+    shed Thou Thy beams within our hearts.
+
+    To Thee our morning song of praise,
+    to Thee our evening prayer we raise;
+    Thee may our glory evermore
+    in lowly reverence adore.
+
+    All laud to God the Father be;
+    all praise, Eternal Son, to Thee;
+    all glory, as is ever meet,
+    to God the Holy Paraclete.
+    Amen.
+status:
+  la: draft
+  en: draft