Add Domine labia mea aperies (x3) to Matins opening

The Monastic-rite versicle "V. Dómine, lábia mea apéries. R. Et os
meum annuntiábit laudem tuam" was entirely absent from Matins' opening
block — only the shared "Deus in adjutórium" versicle was modeled.
Authored per the reference engine's "iij" rubric (recited three times,
after Deus in adjutórium, before Psalm 3), with the English rendered
as imperative ("O Lord, open Thou my lips") rather than future
indicative.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015yHHNsbzD8jLkkmVuJpAcC

src/hours/matins.ts

@@ -756,6 +756,7 @@ export function resolveOrdo(date: string): ResolvedOrdo {
     ? []
     : [
         { kind: 'versicle', text: resolveCommon(getOpeningVersicleId(day.season, day.winner)) },
+        { kind: 'versicle', text: resolveCommon('opening-domine-labia') },
         plainPsalm(3),
         { kind: 'section-heading', label: 'Invitatory' },
         ...invitatoryParts(day),