fix(ef): twelve days were serving the preceding Sunday's Mass

Corpus Christi, the Sacred Heart, and the ferias of the first week after
Epiphany and the first week after Pentecost had no lectionary entry, so each
fell through the walk-back and read the Mass of the Sunday before it. Corpus
Christi -- a I-class feast with one of the best-known formularies in the
Missal -- was reading Trinity Sunday's.

RG 299 is why the first weeks need naming where the others do not: "Item
propriam Missam habent omnes feriae..." -- those ferias have proper Masses,
and the walk-back that serves the rest of the year correctly is wrong for
them.

Citations are colitur's, verified there against both photographic scans. They
were added rather than derived: a comparison of the two lectionaries found the
110 shared slugs agree on EVERY citation, so the divergence was entirely
entries lectio lacked, not entries it had wrong.

Twelve of the 43 colitur has and lectio lacked. The other 31 name days lectio
calls something else, so adding them verbatim would be dead data; those need
the slug question answered first and are deliberately not touched here.

1 files changed, 62 insertions, 0 deletions

diff --git a/internal/caldata/tridentine-lectionary.ini b/internal/caldata/tridentine-lectionary.ini
index 816451b..a04dbe3 100644
--- a/internal/caldata/tridentine-lectionary.ini
+++ b/internal/caldata/tridentine-lectionary.ini
@@ -495,3 +495,65 @@ gospel = Luke 2:21
 first = 1 Thess 1:2-10
 gospel = Matt 13:31-35
 
+
+; ---------------------------------------------------------------------------
+; Added 2026-08-18 from colitur, which verified each against both photographic
+; scans of the 1962 Missal. Every one of these days previously fell through to
+; step 3's walk-back and served the PRECEDING SUNDAY's Mass instead of its own.
+;
+; Corpus Christi and the Sacred Heart are I-class feasts with their own
+; formularies -- they were reading the Sunday before them.
+;
+; The ferias of the FIRST week after Epiphany and of the FIRST week after
+; Pentecost have proper Masses under RG 299 ("Item propriam Missam habent
+; omnes feriae..."), which is why they are named here rather than left to the
+; walk-back that serves the other weeks correctly.
+; ---------------------------------------------------------------------------
+
+[ef-corpus-christi]
+first = 1 Cor 11:23-29
+gospel = John 6:56-59
+
+[ef-sacred-heart]
+first = Eph 3:8-12, 14-19
+gospel = John 19:31-37
+
+[ef-time-after-epiphany-1-monday]
+first = Rom 12:1-5
+gospel = Luke 2:42-52
+
+[ef-time-after-epiphany-1-tuesday]
+first = Rom 12:1-5
+gospel = Luke 2:42-52
+
+[ef-time-after-epiphany-1-wednesday]
+first = Rom 12:1-5
+gospel = Luke 2:42-52
+
+[ef-time-after-epiphany-1-thursday]
+first = Rom 12:1-5
+gospel = Luke 2:42-52
+
+[ef-time-after-epiphany-1-friday]
+first = Rom 12:1-5
+gospel = Luke 2:42-52
+
+[ef-time-after-pentecost-1-monday]
+first = 1 John 4:8-21
+gospel = Luke 6:36-42
+
+[ef-time-after-pentecost-1-tuesday]
+first = 1 John 4:8-21
+gospel = Luke 6:36-42
+
+[ef-time-after-pentecost-1-wednesday]
+first = 1 John 4:8-21
+gospel = Luke 6:36-42
+
+[ef-time-after-pentecost-1-friday]
+first = 1 John 4:8-21
+gospel = Luke 6:36-42
+
+[ef-time-after-pentecost-1-saturday]
+first = 1 John 4:8-21
+gospel = Luke 6:36-42