Add Te decet laus to Matins, drop Ps 129/50 from ferial Preces

Matins now sings "Te decet laus" (Psalterium/Common/Prayers.txt's [Te
decet]) immediately after the Te Deum on every 3-nocturn day, matching
Rule of Benedict ch. 11's close of Vigils. New common text
te-decet-laus.yml, wired into both matins.ts branches that render a Te
Deum; absent on ferial days along with it.

Also drops Psalm 129 (De profundis) from the Lauds ferial Preces and
Psalm 50 (Miserere) from the Vespers ferial Preces, per direct
instruction — both were embedded inline in the live-transcribed text.
Updated the affected fixture tests to key off a versicle that survives
the removal instead of the now-absent psalm text.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EWzE3kaSZCs79fPBrrE1aF

src/hours/matins.ts

@@ -491,6 +491,7 @@ export function resolveOrdo(date: string): ResolvedOrdo {
     parts.push(...sundayCanticleNocturn(sundayAntiphons.nocturn3, day));
     parts.push(...(nocturn3Readings ?? []));
     parts.push({ kind: 'te-deum', text: resolveCommon('te-deum') });
+    parts.push({ kind: 'versicle', text: resolveCommon('te-decet-laus') });
   } else if (threeNocturns) {
     // A Duplex+ weekday feast — genuinely different psalmody from a real
     // Sunday's, not the same content reused. getMatinsPsalmodyOverride
@@ -523,6 +524,7 @@ export function resolveOrdo(date: string): ResolvedOrdo {
       parts.push(...(nocturn3Readings ?? []));
     }
     parts.push({ kind: 'te-deum', text: resolveCommon('te-deum') });
+    parts.push({ kind: 'versicle', text: resolveCommon('te-decet-laus') });
   } else {
     parts.push(...ferialAntiphonedNocturn(day));
     parts.push(...(nocturn1Readings ?? []));