Give each half of Saturday's split Deuteronomy canticle its own citation

canticleText() always returned the whole canticle's stored citation
("Deut 32:1-65"), even when only slicing out half its verses -- both
Saturday Lauds pieces showed the same full range regardless of which
half was actually being said. Derive the citation from the slice's own
first/last verse numbers instead, only when slicing; a full canticle's
stored citation is left as-is, since it already matches what's shown
and a formula can't reproduce an irregular one like
canticum-trium-puerorum's "Dan 3:57-88,56" (a non-contiguous liturgical
splice).

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

tests/hours/lauds.test.ts

@@ -56,6 +56,10 @@ describe('resolveOrdo("lauds", ...)', () => {
 
     const canticle = ordo.parts.find((p) => p.kind === 'canticle' && p.canticleId !== 'benedictus');
     expect(canticle?.kind === 'canticle' ? canticle.canticleId : undefined).toBe('canticum-trium-puerorum');
+    // Its non-contiguous liturgical citation (last verse said out of
+    // numeric order) must come through as authored, not get mangled by
+    // a first/last-verse-number formula the way a naive fix would.
+    expect(canticle?.kind === 'canticle' ? canticle.text.citation?.la : undefined).toBe('Dan 3:57-88,56');
   });
 
   it("resolves Saturday's own psalmody: only one weekday psalm (142), and the Canticle of Moses said in two pieces (RB 13's own division), one shared antiphon framing both", () => {
@@ -78,6 +82,10 @@ describe('resolveOrdo("lauds", ...)', () => {
     expect(part2?.kind === 'canticle' ? part2.antiphon : 'should be undefined -- shares part 1s opening antiphon').toBeUndefined();
     expect(part1?.kind === 'canticle' ? part1.text.text.la : undefined).toContain('Audíte, cæli');
     expect(part2?.kind === 'canticle' ? part2.text.text.la : undefined).toContain('Ignis succénsus est');
+    // Regression test: each half must cite its own verse range, not the
+    // whole canticle's "Deut 32:1-65" on both pieces.
+    expect(part1?.kind === 'canticle' ? part1.text.citation?.la : undefined).toBe('Deut 32:1-32');
+    expect(part2?.kind === 'canticle' ? part2.text.citation?.la : undefined).toBe('Deut 32:33-65');
     // Each part gets its own Gloria Patri.
     expect(part1?.kind === 'canticle' ? part1.gloriaPatri?.text.la : undefined).toContain('Glória Patri');
     expect(part2?.kind === 'canticle' ? part2.gloriaPatri?.text.la : undefined).toContain('Glória Patri');