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-advent.yml

@@ -36,12 +36,6 @@ text:
     Ventúre judex sǽculi,
     Consérva nos in témpore
     Hostis a telo pérfidi.
-
-    Laus, honor, virtus, glória,
-    Deo Patri, et Fílio,
-    Sancto simul Paráclito,
-    In sæculórum sǽcula.
-    Amen.
   en: |
     Bright builder of the heavenly poles,
     Eternal light of faithful souls,
@@ -67,12 +61,6 @@ text:
     Shalt be our Judge, we humbly pray
     Such arms of heavenly grace to send
     As may thy Church from foes defend.
-
-    Be glory given and honour done
-    To God the Father and the Son
-    And to the Holy Ghost on high,
-    From age to age eternally.
-    Amen.
 status:
   la: draft
   en: draft