Fix Beheading of St. John the Baptist's wrong Common category

decollation-of-st-john-baptist.yml's `common` field was set to
common-of-an-apostle -- a mistaken placeholder (he isn't an apostle) that
leaked into the Aug 29 Matins invitatory and the Lauds/Vespers office
bundle. Corrected to common-of-a-martyr, matching the file's own already-
correct `minorHoursCommon` field.

Also corrected a stale comment in the feast's own nocturn-readings file
claiming neither Nocturn 2 nor 3 has a proper responsory: Nocturn 2's own
closing responsory is genuine proper text (not a Commune reference like
Nocturn 3's), and is now authored.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WvnBMq7HGfXRyMsVLu2v4D

src/data/calendar/saints/decollation-of-st-john-baptist.yml

@@ -2,14 +2,11 @@
 # kalendar check (2025-08-29) -- winner outright, Duplex, over the stub
 # St. Sabina (see st-sabina.yml). About St. John the Baptist's beheading,
 # not a feast of the Lord/BVM, so kept in scope like his Nativity in June.
-# "common-of-an-apostle" is a loose fit (he isn't one) but the closest
-# existing category to "a major male saint honored with his own high
-# feast" -- same judgment call as nativity-of-st-john-the-baptist.yml.
 # Own proper collect and antiphon.
 id: decollation-of-st-john-baptist
 name: "The Beheading of St. John the Baptist"
 rank: duplex
-common: common-of-an-apostle
+common: common-of-a-martyr
 propers: "decollation-of-st-john-baptist"
 # P/T/S/N: no [Ant Prima]/etc of its own in the source (08-29.txt) --
 # [Rule]/[Rank] point to Commune/C2a instead, the same C-number family

src/data/propers/nocturn-readings/decollation-of-st-john-baptist.yml

@@ -7,13 +7,18 @@
 # web/www/horas/Latin/Sancti/08-29.txt, English/Sancti/08-29.txt.
 #
 # Nocturn 2: Lectio4-6 (St. Ambrose's treatise On Virgins) combined
-# into one reading, one continuous excerpt.
+# into one reading, one continuous excerpt. Its closing responsory
+# ([Responsory6], marked &Gloria) is genuine proper text, not a
+# Commune reference, so it's authored below.
 # Nocturn 3: Lectio7's Gospel citation (Mark 6:17-29) is a bare
 # incipit ("Et réliqua") with no full pericope text given, so — per
 # the pre-1955 pass's convention of not transcribing bare incipits —
 # only the homily portion is authored (not marked isGospel), combined
 # with Lectio8 as one continuous excerpt of St. Augustine's sermon.
-# No responsory given for either reading.
+# [Responsory4], [Responsory7], [Responsory8] are all genuine Commune
+# references (@Commune/C2a:Responsory2/5/6 -- Common of a Martyr, per
+# decollation-of-st-john-baptist.yml's own `common` field), so Nocturn
+# 3 correctly has no proper responsory of its own.
 id: decollation-of-st-john-baptist
 readings:
   - nocturn: 2
@@ -82,6 +87,9 @@ readings:
         silent now, can repeat no more the denunciation which thou couldest not bear to hear, and
         still thou art afraid of it.
     status: { la: verified, en: verified }
+    responsory:
+      la: "R. Honéstum fecit illum Dóminus, et custodívit eum ab inimícis, et a seductóribus tutávit illum: * Et dedit illi claritátem ætérnam.\nV. Descendítque cum illo in fóveam, et in vínculis non derelíquit eum.\nR. Et dedit illi claritátem ætérnam."
+      en: "R. The Lord made him honourable, and kept him from his enemies, and defended him from seducers: * and gave him everlasting glory.\nV. He went down with him into the pit, and left him not in bonds.\nR. And gave him everlasting glory."
 
   - nocturn: 3
     isGospel: false

tests/hours/matins.test.ts

@@ -596,6 +596,16 @@ describe('resolveOrdo("matins", ...) invitatory antiphon doubling by rank', () =
     expect(openingAntiphonLatin('2026-08-24')).toContain('Regem Apostolórum Dóminum, * Veníte');
   });
 
+  it("the Beheading of St. John the Baptist (2026-08-29, common corrected from apostle to martyr) opens with the martyr Common's invitatory antiphon, not the apostle one", () => {
+    // Regression test: decollation-of-st-john-baptist.yml's `common` field
+    // used to be common-of-an-apostle (a mistaken placeholder -- he isn't
+    // an apostle), which leaked into the Matins invitatory. Corrected to
+    // common-of-a-martyr, matching the file's own already-correct
+    // `minorHoursCommon`.
+    expect(openingAntiphonLatin('2026-08-29')).toContain('Regem Mártyrum Dóminum, * Veníte');
+    expect(openingAntiphonLatin('2026-08-29')).not.toContain('Regem Apostolórum');
+  });
+
   it('a plain ferial day opens with the incipit only', () => {
     expect(openingAntiphonLatin(FERIAL_DATE)).not.toContain('Exsultémus');
   });

tests/hours/vespers.test.ts

@@ -456,14 +456,17 @@ describe('resolveOrdo("vespers", ...)', () => {
     expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Iste Conféssor Dómini sacrátus');
   });
 
-  it("uses common-of-an-apostle's real office bundle for the Beheading of St. John the Baptist's First Vespers", () => {
+  it("uses common-of-a-martyr's real office bundle for the Beheading of St. John the Baptist's First Vespers", () => {
     // Live-verified against Divinum Officium (Monastic Tridentinum 1617)
-    // votive=C1 -- see vespers-hymn-common-of-an-apostle.yml's header.
+    // votive=C2 -- see vespers-hymn-common-of-a-martyr.yml's header.
+    // decollation-of-st-john-baptist.yml's own `common` field was
+    // corrected from common-of-an-apostle to common-of-a-martyr (he
+    // isn't an apostle; his own `minorHoursCommon` already agreed).
     const ordo = resolveOrdo('vespers', '2026-08-28');
     const chapter = ordo.parts.find((p) => p.kind === 'chapter');
-    expect(chapter?.kind === 'chapter' ? chapter.text.citation?.en : undefined).toBe('Eph 2:19-20');
+    expect(chapter?.kind === 'chapter' ? chapter.text.citation?.en : undefined).toBe('Jas 1:12');
     const hymn = ordo.parts.find((p) => p.kind === 'hymn');
-    expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Exsúltet cælum láudibus');
+    expect(hymn?.kind === 'hymn' ? hymn.text.text.la : undefined).toContain('Deus tuórum mílitum');
   });
 
   it("no longer gives St. Margaret of Scotland First Vespers now that Corpus Christi's own octave is modeled", () => {