Extend closing Gloria Patri to canticles, centralize instead of baking it in

Benedictus, Magnificat, and Nunc Dimittis had the Gloria Patri baked
verbatim into their propers YAML with no Triduum suppression; Matins'
Nocturn 3 OT canticles had none at all. Give the 'canticle' ResolvedPart
the same centrally-attached gloriaPatri field psalms already got, strip
the baked-in text, and drop Lauds' now-redundant local append/Triduum
check — live-verified that canticles follow the exact same Triduum-only
omission as psalms (e.g. Benedictus at Lauds of Holy Thursday).

src/data/propers/common/nunc-dimittis.yml

@@ -1,7 +1,10 @@
 # Verified against Divinum Officium (Tridentine 1906 run, 2026-08-25 —
 # Monastic Compline doesn't have this canticle at all; it's added from the
 # Tridentine 1906 form by explicit choice). The antiphon that frames it
-# ("Salva nos") is a separate proper — see nunc-dimittis-antiphon.yml.
+# ("Salva nos") is a separate proper — see nunc-dimittis-antiphon.yml. The
+# closing Gloria Patri isn't stored here either — it's attached centrally
+# (hours/index.ts) so it can be omitted during the Sacred Triduum, same as
+# every other canticle/psalm.
 id: nunc-dimittis
 text:
   la: |
@@ -9,15 +12,11 @@ text:
     Quia vidérunt óculi mei * salutáre tuum,
     Quod parásti * ante fáciem ómnium populórum,
     Lumen ad revelatiónem géntium, * et glóriam plebis tuæ Israël.
-    V. Glória Patri, et Fílio, * et Spirítui Sancto.
-    R. Sicut erat in princípio, et nunc, et semper, * et in sǽcula sæculórum. Amen.
   en: |
     Now ✠ thou dost dismiss thy servant, O Lord, * according to thy word in peace;
     Because my eyes have seen * thy salvation,
     Which thou hast prepared * before the face of all peoples:
     A light to the revelation of the Gentiles, * and the glory of thy people Israel.
-    V. Glory be to the Father, and to the Son, * and to the Holy Ghost.
-    R. As it was in the beginning, is now, * and ever shall be, world without end. Amen.
 citation:
   la: "Luc. 2:29-32"
   en: "Luke 2:29-32"