Strip the editorializing parenthetical out of the Canticle of Moses's citation

The user-facing citation field carried an explanatory aside
("liturgical division; split across two Lauds slots") instead of a
plain reference. Move that explanation into the file's own header
comment (which already existed) and leave citation as just "Deut
32:1-65".

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018sPkfGLiq58pmmDoBWH5UX

src/data/hours/lauds-canticles/canticum-moysis-deuteronomii.yml

@@ -1,8 +1,8 @@
-# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds live query. Verse numbering is the breviary's own liturgical division for chant, not always identical to standard Bible chapter:verse numbering.
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds live query. Verse numbering is the breviary's own liturgical division for chant, not always identical to standard Bible chapter:verse numbering. Split across two Lauds slots (own Gloria Patri each) -- see lauds-antiphons.yml's saturday.canticle comment.
 
 id: canticum-moysis-deuteronomii
 name: Canticle of Moses (Deuteronomy)
-citation: "Deut 32:1-65 (liturgical division; split across two Lauds slots)"
+citation: "Deut 32:1-65"
 verses:
   - n: "32:1"
     text: