Import St. Gregory the Great's own proper Lauds/Vespers content

Live-verified against Divinum Officium (Monastic Tridentinum 1617),
2033-03-12 (clean year, per his own saint file's comment). Own chapter
(Eccli 50:1, "Ecce sacérdos magnus... suffúlsit domum") and own hymns at
both hours ("Mella cor obdulcántia" Lauds, "Anglórum jam Apóstolus"
Vespers, the latter recounting his sending Augustine of Canterbury and
the "non Angli sed Angeli" legend); responsory and versicle turn out
byte-identical to Common-of-a-Confessor-Bishop's own, reused verbatim.
Neither hymn has an English rendering in the reference engine at all --
own original translations, marked draft.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc

tests/hours/vespers.test.ts

@@ -344,6 +344,15 @@ describe('resolveOrdo("vespers", ...)', () => {
     expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Ave maris stella');
   });
 
+  it("resolves St. Gregory the Great's own proper Vespers hymn, distinct from the Lauds one", () => {
+    // Live-verified against Divinum Officium (Monastic Tridentinum
+    // 1617), 2033-03-12 (clean year). See lauds-capitulum-st-gregory-
+    // the-great.yml's header.
+    const ordo = resolveOrdo('vespers', '2033-03-12');
+    const hymn = ordo.parts.find((p) => p.kind === 'hymn');
+    expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Anglórum jam Apóstolus');
+  });
+
   it("renders Passiontide's seasonal office, with the Gloria Patri omitted from the responsory", () => {
     // 2026-03-30 is Holy Monday (Passion Sunday 2026-03-22 through Holy
     // Saturday 2026-04-04) -- deliberately not 03-25, the Annunciation's