Wire seasonal hymn-doxology into every plain-default Vespers hymn

Sunday's hymn ("Lucis Creator") is the one case whose Monastic source text
carries a real "*" seasonal-substitution marker (live-checked); every other
key (Mon-Sat, Advent, Lent, Passiontide, Paschaltide) is wired the same way
anyway as a deliberate broadening beyond the source, at the user's request
("the doxology is a neat way to stay tuned in to the season... we're doing a
remix, not a copy"). Each hymn's own natural ending is split into a matching
per-annum companion file, so a season/feast with no override reproduces the
original text exactly; only Nat/Epi/Pasch/Asc/Pent/Corp/Heart and the two
feast/date overrides from the previous commit actually change anything.

Real visible effect: hymns shown during Christmastide/Epiphanytide/Corpus
Christi/Sacred Heart (none of which get a distinct seasonal hymn, so these
were always the plain weekday defaults) now pick up the right doxology
instead of a generic ending; Ascensiontide and the Pentecost octave now
diverge from the rest of Paschaltide's doxology mid-season.

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

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

@@ -6,6 +6,11 @@
 # here rather than left as a diff — not live-query-verified (see TODO.md).
 # English has no separate Monastic variant in the source (the wording
 # differences don't affect translation), so it's the same text either way.
+# The closing doxology stanza is split out into
+# vespers-hymn-sunday-doxology-per-annum.yml (see hours/vespers.ts) — the source
+# carries a real "*" seasonal-substitution marker there (live-checked
+# 2026-09-03, Psalterium/Special/Major Special.txt), unlike every other
+# Lauds/Vespers weekday hymn's fixed ending.
 id: vespers-hymn-sunday
 text:
   la: |
@@ -28,12 +33,6 @@ text:
     Vitále tollat prǽmium:
     Vitémus omne nóxium:
     Purgémus omne péssimum.
-
-    Præsta, Pater piíssime,
-    Patríque compar Únice,
-    Cum Spíritu Paráclito
-    Regnans per omne sǽculum.
-    Amen.
   en: |
     O blest Creator of the light,
     Who mak'st the day with radiance bright,
@@ -54,12 +53,6 @@ text:
     The heavenly gate and prize to gain:
     Each harmful lure aside to cast,
     And purge away each error past.
-
-    O Father, that we ask be done,
-    Through Jesus Christ, thine only Son;
-    Who, with the Holy Ghost and thee,
-    Doth live and reign eternally.
-    Amen.
 status:
   la: draft
   en: draft