fix(calendar): OF precedence/transfer + readings resolution; EF Pentecost octave

Fixes found by validating the offline engine per-day vs the LiturgicalCalendar
API (OF) and missalemeum (EF) across 2005-2050. OF calendar is now 0 real
errors in the forward window (season/cycle already perfect).

OF precedence/transfer (calendar):
- Ash Wednesday and Holy Week Mon-Wed are band-2 privileged, so a coinciding
  feast (Chair of St Peter on Ash Wednesday) is suppressed, not observed.
- Solemnities transfer out of Holy Week / the Easter octave: the Annunciation
  defers to the Monday after the 2nd Sunday of Easter; St Joseph is anticipated
  to the Saturday before Palm Sunday; the Nativity of St John the Baptist moves
  to Jun 23 when a Lord's solemnity (Sacred Heart / Corpus Christi) falls Jun 24.
- Within a precedence band, a solemnity of the Lord/BVM outranks a saint's
  (dignity tiebreak) rather than losing an alphabetical slug tie.
- Perpetua & Felicity corrected optional -> obligatory memorial.

OF readings resolution (bible.OFRef + lectionary data):
- Verse-accurate Hebrew->Vulgate psalm mapping incl. the split psalms
  (9/10, 114/115, 116, 147); "+" verse joins and abbreviated ranges ("127-28")
  normalized; single-chapter books (2/3 John, Jude) get chapter 1.
- Cleaned harvest artifacts from of-lectionary.ini (descriptive-suffix gospels,
  "or Year A" alternates, "*"/"[Vulg.]"/bracket markers, slash abbreviations);
  Joel/Malachi/Zechariah/Esther book-versification citations fixed to Vulgate.
- Split a merged Ps 15:10/11 row in vul.tsv. Result: 0 unresolvable OF readings
  over 2557 rendered days (cycles A/B/C, varied Easters).

EF: the Octave of Pentecost (Whit Monday-Saturday) is red, not white.

1 files changed, 21 insertions, 0 deletions

diff --git a/internal/calendar/precedence.go b/internal/calendar/precedence.go
index 3b7c0a6..3c7bf5f 100644
--- a/internal/calendar/precedence.go
+++ b/internal/calendar/precedence.go
@@ -82,6 +82,13 @@ func pick(cands []candidate) (candidate, []candidate) {
 		if pi != pj {
 			return pi < pj
 		}
+		// Within a band, higher liturgical dignity wins (Table of Liturgical Days:
+		// of the Lord, then of the BVM, then of saints) -- so a Lord's solemnity
+		// (Sacred Heart, Corpus Christi) outranks a coinciding saint's solemnity
+		// rather than losing an alphabetical tie.
+		if di, dj := dignity(sorted[i].Cel), dignity(sorted[j].Cel); di != dj {
+			return di < dj
+		}
 		return sorted[i].Cel.Slug < sorted[j].Cel.Slug
 	})
 	// General Norms 60: when two obligatory memorials fall on the same day, both
@@ -108,6 +115,20 @@ func pick(cands []candidate) (candidate, []candidate) {
 	return sorted[0], sorted[1:]
 }
 
+// dignity ranks a celebration within its precedence band by the Table of
+// Liturgical Days' order of dignity: of the Lord (0), of the BVM (1), of saints
+// or unclassified (2).
+func dignity(c Celebration) int {
+	switch c.Class {
+	case ClassLord:
+		return 0
+	case ClassBVM:
+		return 1
+	default:
+		return 2
+	}
+}
+
 // slugIndex returns the position of the candidate with the given slug, or -1.
 func slugIndex(cands []candidate, slug string) int {
 	for i, c := range cands {