feat(of): proper readings for the movable Marian memorials

Mary, Mother of the Church and the Immaculate Heart of Mary are computed in the
engine (no fixed-date INI entry), so they fell back to the ferial. Attach their
proper Masses inline: Mary MotC = Gen 3:9-15,20 / Ps 87 / John 19:25-34;
Immaculate Heart = Isa 61:9-11 / 1 Sam 2 canticle / Luke 2:41-51. Verified they
render when observed (Immaculate Heart 2029-06-09). Extends TestOFMovableMemorials.

1 files changed, 15 insertions, 2 deletions

diff --git a/internal/calendar/coverage_test.go b/internal/calendar/coverage_test.go
index cbd3fde..c464e56 100644
--- a/internal/calendar/coverage_test.go
+++ b/internal/calendar/coverage_test.go
@@ -77,10 +77,23 @@ func TestOFMovableMemorials(t *testing.T) {
 	sel := calendar.DefaultSelection() // Ordinary Form
 	layers := []calendar.Layer{caldata.Universal()}
 
-	// Mary, Mother of the Church: Monday after Pentecost (2027: May 17).
-	if got := calendar.Compute(day(2027, time.May, 17), sel, layers); got.Observed.Slug != "mary-mother-of-the-church" {
+	// Mary, Mother of the Church: Monday after Pentecost (2027: May 17), with its
+	// proper readings (not the ferial).
+	got := calendar.Compute(day(2027, time.May, 17), sel, layers)
+	if got.Observed.Slug != "mary-mother-of-the-church" {
 		t.Errorf("2027-05-17: observed %q, want mary-mother-of-the-church", got.Observed.Slug)
 	}
+	var first string
+	for _, m := range got.Observed.Masses {
+		for _, r := range m.Readings {
+			if r.Part == "first" {
+				first = r.Citation
+			}
+		}
+	}
+	if first != "Genesis 3:9-15,20" {
+		t.Errorf("Mary MotC first reading = %q, want Genesis 3:9-15,20", first)
+	}
 	// Two obligatory memorials coincide (St Anthony of Padua + the Immaculate
 	// Heart, 2026-06-13): both become optional and the ferial is observed.
 	if got := calendar.Compute(day(2026, time.June, 13), sel, layers); got.Observed.Rank != calendar.RankFerial {