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

tests/hours/vespers.test.ts

@@ -229,11 +229,15 @@ describe('resolveOrdo("vespers", ...)', () => {
     expect(collectIndex).toBeGreaterThan(litanyIndex);
   });
 
-  it('uses the fuller Tridentine 1906/1910 ferial Preces (with Psalm 50) on a plain ferial day, not the short Sunday/feast litany', () => {
+  it('uses the fuller Tridentine 1906/1910 ferial Preces on a plain ferial day, not the short Sunday/feast litany', () => {
+    // Psalm 50 (Miserere), present in the live render, is deliberately
+    // dropped from this app's own text (2026-08) — 'Ego dixi' is the next
+    // versicle after where the psalm used to sit, still unique to the
+    // fuller ferial form vs. the short litany.
     const ordo = resolveOrdo('vespers', '2026-06-16');
     const preces = ordo.parts.find((p) => p.kind === 'preces' && p.text.text.la?.includes('Kýrie, eléison'));
-    expect(preces?.kind === 'preces' ? preces.text.text.la : undefined).toContain('Miserére mei, Deus');
-    expect(preces?.kind === 'preces' ? preces.text.text.en : undefined).toContain('Have mercy on me, O God');
+    expect(preces?.kind === 'preces' ? preces.text.text.la : undefined).toContain('Ego dixi: Dómine, miserére mei');
+    expect(preces?.kind === 'preces' ? preces.text.text.en : undefined).toContain('I said: Lord, be merciful');
   });
 
   it("uses the short Sunday/feast litany, without Psalm 50, on a Sunday and on a real saint's own winning day", () => {