Port seasonal office content to Lauds, closing the same pre-existing gap

Lauds had the identical issue Vespers started with: resolveOffice only
ever rendered the plain weekday chapter/responsory/hymn/versicle,
year-round, with no Advent/Lent/Passiontide/Paschaltide override —
same source file (Major Special.txt) as Vespers', just never wired up.
Ports the same seasonalOfficeSuffix-based precedence (per-feast/octave
override -> season -> weekday default) and the matching seasonal
content, transcribed the same way as Vespers' own (Monastic hymn
variants applied from the source's substitution notation against each
base Roman text). Paschaltide's chapter is byte-identical to Vespers'
own — the source aliases "[Pasch Vespera] = @:Pasch Laudes" — so both
hours' data files intentionally carry the same text rather than one
importing the other's id.

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

src/data/propers/common/lauds-hymn-advent.yml

@@ -0,0 +1,66 @@
+# Sourced from Divinum Officium's Monastic block ("[HymnusM Adv Laudes]",
+# resolving to "[HymnusM Adv Laudes_]" on the non-Cistercian branch —
+# Psalterium/Special/Major Special.txt) — full separate Monastic text
+# ("Vox clara ecce íntonat"), not a substitution against the Roman "En
+# clara vox redárguit". English is the familiar John Mason Neale
+# translation ("Hark! a herald voice is calling"), traditionally used for
+# both this hymn's Roman and Monastic/Sarum recensions — a closer match
+# than the Advent Vespers hymn's English got. Not live-query-verified (see
+# TODO.md).
+id: lauds-hymn-advent
+text:
+  la: |
+    Vox clara ecce íntonat,
+    Obscúra quæque íncrepat:
+    Pellántur éminus sómnia;
+    Ab æthre Christus prómicat.
+
+    Mens jam resúrgat tórpida
+    Quæ sorde exstat sáucia;
+    Sidus refúlget jam novum,
+    Ut tollat omne nóxium.
+
+    E sursum Agnus míttitur
+    Laxáre gratis débitum:
+    Omnes pro indulgéntia
+    Vocem demus cum lácrimis,
+
+    Secúndo ut cum fúlserit,
+    Mundúmque horror cínxerit,
+    Non pro reátu púniat,
+    Sed nos pius tunc prótegat.
+
+    Laus, honor, virtus, glória,
+    Deo Patri, et Fílio,
+    Sancto simul Paráclito,
+    In sæculórum sǽcula.
+    Amen.
+  en: |
+    Hark, a herald voice is calling;
+    "Christ is nigh," it seems to say;
+    "Cast away the dreams of darkness,
+    O ye children of the day."
+
+    Startled at the solemn warning,
+    Let the earth-bound soul arise;
+    Christ, her sun, all sloth dispelling,
+    Shines upon the morning skies.
+
+    Lo, the Lamb, so long expected,
+    Comes with pardon down from heaven;
+    Let us haste, with tears of sorrow,
+    One and all to be forgiven.
+
+    So when next he comes with glory,
+    Wrapping all the earth in fear,
+    May he then as our defender
+    On the clouds of heaven appear.
+
+    Honour, glory, virtue, merit,
+    To the Father and the Son,
+    With the co-eternal Spirit,
+    While eternal ages run.
+    Amen.
+status:
+  la: draft
+  en: draft