Add Assumption octave commemoration content

Assembled from already-verified Assumption pieces (Benedictus
antiphon, Vespers V/R, post-1950-dogma collect) since the octave
commemoration block this app's own generous-commemorations design
calls for has no direct reference-engine source to copy.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L3wxvz3mPXiHxkPB5JpnmD

src/data/propers/common/assumption-octave-commemoration.yml

@@ -0,0 +1,40 @@
+# Commemoratio Octavæ Assumptionis -- said at Lauds/Vespers on a day
+# within the Assumption's octave (Aug 16-22) where the Assumption itself
+# doesn't win the day outright (e.g. St. Bernard, Aug 20, Duplex, beats
+# the octave's own Semiduplex threshold -- see hours/resolve-common.ts's
+# getDayCollects, kind: 'octave' branch). No reference-engine text exists
+# for this exact block: the live Monastic Tridentinum 1617 engine (and
+# the default Tridentine version) both render only St. Bernard's own
+# oration on Aug 20, no Assumption commemoration at all -- this app's own
+# "generous commemorations" design (see CLAUDE.md's "Not a
+# reconstruction" note) deliberately goes further than any single
+# historical rite here, so this block is assembled from already-verified
+# Assumption pieces rather than copied whole from one reference-engine
+# page: the antiphon from assumption-antiphon.yml (Lauds/Benedictus, the
+# only plain antiphon authored for the feast), the versicle/response from
+# vespers-versicle-assumption.yml, and the collect from
+# assumption-collect.yml (already in the "Per eúmdem" commemoration
+# doxology form) -- matching christmas-day-octave-commemoration.yml's own
+# "one shared Ant+V/R+collect block regardless of hour" shape and
+# assembly method.
+id: assumption-octave-commemoration
+text:
+  la: |
+    Ant. Quæ est ista quæ ascéndit sicut auróra consúrgens, pulchra ut luna, elécta ut sol, terríbilis ut castrórum ácies ordináta?
+    V. Exaltáta est sancta Dei Génitrix.
+    R. Super choros Angelórum ad cæléstia regna.
+    Orémus.
+    Omnípotens sempitérne Deus, qui Immaculátam Vírginem Maríam, Fílii tui Genetrícem, córpore et ánima ad cæléstem glóriam assumpsísti: concéde, quǽsumus; ut ad supérna semper inténti, ipsíus glóriæ mereámur esse consórtes.
+    Per eúmdem Dóminum nostrum Jesum Christum Fílium tuum, qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Ant. Who is she that cometh up like the rising dawn, fair as the moon, clear as the sun, terrible as a fenced camp set in battle array?
+    V. The holy Mother of God hath been exalted.
+    R. Over choirs of Angels, into the heavenly kingdom.
+    Let us pray.
+    Almighty everlasting God, who hast taken body and soul into heaven the Immaculate Virgin Mary, Mother of thy Son: grant, we beseech thee, that by steadfastly keeping heaven as our goal we may be counted worthy to join her in glory.
+    Through the same Jesus Christ, thy Son, Our Lord, Who liveth and reigneth with thee in the unity of the Holy Ghost, God, world without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified