fix(of): canonical OT ferial week numbering + CR-sourced ferial lectionary

The Ordinary Form ferial lectionary had two linked defects, both from harvesting
niedziela.pl by date: (1) post-Pentecost Ordinary-Time ferial WEEK NUMBERS were
one too high (temporal.go counted back from Christ the King using the weekday
itself, not its preceding Sunday, so a ferial took the next week's number), and
(2) ~17 ferial keys held a SAINT's readings (stored when a saint displaced the
ferial on the queried date, e.g. week 22 smeared with a Marian Prov 8/John 2),
plus 16 weekday slots were missing entirely.

- temporal.go: number a span-2 ferial from its preceding Sunday. Verified
  388/388 ferial-week agreement with calapi across 2026-2028.
- scripts/genlect-of-cr.py: regenerate the Ordinary-Time ferial lectionary
  (first/psalm/gospel, both years, all 34 weeks) from catholic-resources.org
  (Fr. Felix Just, S.J.), which is keyed by liturgical position (immune to
  by-date contamination) and complete. Citations only; text still rendered from
  the public-domain corpora. of-lectionary.ini OT ferials now 408 (was 392).

Fixes ~17 contaminated entries + 16 gaps + the week-numbering audit item. Psalms
already share modern numbering, so no conversion. Adds TestOFOrdinaryTimeFerialWeek.
Credits catholic-resources.org in NOTICE. Bumps to 0.40.0.

2 files changed, 26 insertions, 2 deletions

diff --git a/internal/calendar/coverage_test.go b/internal/calendar/coverage_test.go
index e6555b9..cbd3fde 100644
--- a/internal/calendar/coverage_test.go
+++ b/internal/calendar/coverage_test.go
@@ -52,6 +52,25 @@ func TestEFCoverage(t *testing.T) {
 	}
 }
 
+// TestOFOrdinaryTimeFerialWeek guards the post-Pentecost Ordinary-Time ferial
+// week numbering, which was one too high (a weekday took Christ-the-King's week
+// instead of its preceding Sunday's). calapi confirms these canonical weeks.
+func TestOFOrdinaryTimeFerialWeek(t *testing.T) {
+	sel := calendar.DefaultSelection()
+	layers := []calendar.Layer{caldata.Universal()}
+	for _, c := range []struct {
+		date time.Time
+		slug string
+	}{
+		{day(2026, time.June, 8), "ordinary-10-mon"},  // calapi: 10th week
+		{day(2026, time.June, 15), "ordinary-11-mon"}, // calapi: 11th week
+	} {
+		if got := calendar.Compute(c.date, sel, layers); got.Observed.Slug != c.slug {
+			t.Errorf("%s: OT ferial slug %q, want %q", c.date.Format("2006-01-02"), got.Observed.Slug, c.slug)
+		}
+	}
+}
+
 // TestOFMovableMemorials checks Mary, Mother of the Church, the Immaculate Heart,
 // and the two-obligatory-memorials rule.
 func TestOFMovableMemorials(t *testing.T) {
diff --git a/internal/calendar/temporal.go b/internal/calendar/temporal.go
index 13f1385..ab1a742 100644
--- a/internal/calendar/temporal.go
+++ b/internal/calendar/temporal.go
@@ -231,8 +231,13 @@ func temporal(date time.Time, sel Selection) temporalDay {
 		if date.Before(ashWed) {
 			week = daysBetween(baptismThis, date)/7 + 1
 		} else {
-			// count back from Christ the King = the 34th week.
-			week = 34 - daysBetween(date, christTheKing)/7
+			// Span 2 resumes after Pentecost; Sundays are numbered backward from
+			// Christ the King (the 34th and last Sunday). A weekday takes the number
+			// of its preceding Sunday, so count from that Sunday, not from the
+			// weekday itself (which would round toward Christ the King and land a
+			// week too high — the OT ferial off-by-one).
+			precedingSunday := date.AddDate(0, 0, -int(date.Weekday()))
+			week = 34 - daysBetween(precedingSunday, christTheKing)/7
 		}
 		if week < 1 {
 			week = 1