fix(lectionary): the week after Trinity says its own assigned Mass

RG 299 located (scan1:1096-1098), which does two things at once.

First it closes a standing gap: the ferial-Mass selection rule was
recorded in the register as unconfirmed against the primary source, and
step 3 said so in its own comment -- "lectio's own observed behaviour,
not a confirmed Missal citation". It is confirmed now. "In reliquis
feriis dicitur Missa dominicae praecedentis, nisi a rubricis aliter
provisum sit", restated in the propers as "...nisi propria Missa
assignetur".

Second, that escape clause splits M26 shape 2 in half, which is why the
shape was never resolvable as one thing.

Shape 2(a), the week after Trinity, is fixed. Trinity is the temporal
identity of its own Sunday, so a plain walkback lands on Trinity's Mass
-- but the Missal prints a named formula for the following week, "Missa
dominicae I post Pentecosten" (scan1:21758), precisely because the feast
has taken that Sunday's own. Those ferias now resolve at step 2 from it
and never reach the walkback.

Shape 2(b), Christ the King's week, turns out not to be a bug at all. No
proper Mass is assigned there -- checked directly, no rubric precedes
that Mass heading (scan1:39163ff) -- so RG 299's default governs and "the
Mass of the preceding Sunday" genuinely is Christ the King's own, which
is what colitur emits and missalemeum does not. Kept open only because no
rubric specific to that week was located either way; the verdict is now
argued from the primary text rather than resting on oracle disagreement.

No Thursday in the slug list: Corpus Christi is Easter+60, which IS that
week's Thursday every year, so the ferial slug never exists. Found by the
bootstrap's own reachability guard refusing to emit a key no Temporal_ef
slug can match, not reasoned out in advance.

Allow-lists: C35 opened (69 rows, verdict colitur -- lectio still walks
back); C17 narrowed 406 to 397, nine Saturdays moving to C35 because they
carry both a citation and a colour difference, with C35 gated to require
the citation so a colour-only Saturday still falls to C17; M26 narrowed
30 to 27; M18 widened 352 to 355, the same three days keeping only their
observed-identity difference.

Register: section 6.11.

1 files changed, 4 insertions, 4 deletions

diff --git a/data/ef/expected-divergences-missalemeum.sexp b/data/ef/expected-divergences-missalemeum.sexp
index 90ffceb..effb7c9 100644
--- a/data/ef/expected-divergences-missalemeum.sexp
+++ b/data/ef/expected-divergences-missalemeum.sexp
@@ -250,8 +250,8 @@ REVISED, ef-bvm-saturday task: 395 of the 730 days in this window used to carry
 
 REVISED AGAIN, Task 9 (branch ef-lectionary, layer-4 oracle): 352, down by 42 from 394. NOT a change to this entry's own guard (still, and only, [diffs = [ Observed_identity_unresolved ]] exactly) -- this task compared reading citations for the first time, and 42 of the former 394 rows now ALSO carry a real [First_mismatch]/[Gospel_mismatch] alongside the pre-existing observed-identity gap, so they escape this entry's own EXACT-match guard and move to the FIVE new entries below (M23 2, M24 4, M25 4, M26 30, M27 2 -- 2+4+4+30+2=42, exactly accounting for the drop, verified against the comparator's own failure output, not assumed from the arithmetic alone -- CORRECTED, fix round 1, coordinator review: this note previously miscounted them as \"six\").
 
-CORRECTED, fix round 1 (coordinator review): the remaining 352 were previously described as every day whose citation \"ALREADY agreed with missalemeum before this task and still does\" -- imprecise for 18 of them. Before this task the citation axis did not exist at all, so NO row's citation was ever actually checked; \"already agreed\" wrongly implies the pre-task VALUE was correct on all 352, when for 18 it was not -- it only became correct, and therefore only started agreeing, because of this task's own three fixes (Holy Name Sunday's own two dates, 2026-01-04/2027-01-03; 12 more January-window ferias across the three RG-17(a)/Holy-Family-propers-rubric families that now resolve at step 2 instead of the walkback, one full list: 2026-01-02/05/07/08/09/12, 2027-01-04/05/07/08/11/12; and Corpus Christi/Sacred Heart in both years, 2026-06-04/06-12, 2027-05-27/06-04 -- 2+12+4=18, independently re-derived against the real resolver, not merely arithmetic). The other 334 were genuinely unaffected by this task, matching both before and after (or, more precisely, would have matched on the day this axis existed either way).")
- (expected_rows 352))
+CORRECTED, fix round 1 (coordinator review): the remaining 352 were previously described as every day whose citation \"ALREADY agreed with missalemeum before this task and still does\" -- imprecise for 18 of them. Before this task the citation axis did not exist at all, so NO row's citation was ever actually checked; \"already agreed\" wrongly implies the pre-task VALUE was correct on all 352, when for 18 it was not -- it only became correct, and therefore only started agreeing, because of this task's own three fixes (Holy Name Sunday's own two dates, 2026-01-04/2027-01-03; 12 more January-window ferias across the three RG-17(a)/Holy-Family-propers-rubric families that now resolve at step 2 instead of the walkback, one full list: 2026-01-02/05/07/08/09/12, 2027-01-04/05/07/08/11/12; and Corpus Christi/Sacred Heart in both years, 2026-06-04/06-12, 2027-05-27/06-04 -- 2+12+4=18, independently re-derived against the real resolver, not merely arithmetic). The other 334 were genuinely unaffected by this task, matching both before and after (or, more precisely, would have matched on the day this axis existed either way). WIDENED 352 -> 355 (movable-date-specs follow-up, 2026-08-17): the three Trinity-week ferias that M26 shape 2(a) used to cover now agree with the oracle on their citations and differ only on observed-identity, which is this entry own generic shape -- a temporal-origin day for which colitur sets no English name. Not a new divergence: the same three days, one of their two causes removed.")
+ (expected_rows 355))
  ((id M19)
  (citation "RG 110's OTHER direction: \"In Officio et Missa S. Petri semper fit commemoratio S. Pauli, ET VICISSIM\" -- the SAME rule M12 used to cite, applied here to Paul's own office commemorating Peter, not Peter's own office commemorating Paul; confirmed a third time by the calendarium's own June table, both photographic scans, word for word: \"In Commemoratione S. Pauli Ap., III classis. / Commemoratio S. Petri Ap.\"")
  (verdict colitur)
@@ -290,8 +290,8 @@ SHAPE 1 -- 21 rows: RG 78's own rotating votive Mass of the BVM (\"Missae de san
 
 SHAPE 2 -- 9 rows, a SECOND, DIFFERENT gap: ferias of a week whose own Sunday was DISPLACED that year by a movable named temporal-cycle feast, where the Missal requires the DISPLACED Sunday's own Mass to continue informing that week's ferias, but step 3 walks back to the DISPLACING feast's citation instead. Two witnessed instances: (a) 2026-06-02/03 and 2027-05-24 (the ferias between Trinity Sunday and Corpus Christi) -- the Missal prints a named formula for exactly this week, \"Missa Dominicae I post Pentecosten\" (1 Ioann. 4,8-21/Luc. 6,36-42, docs/research/scan1.txt:21758-21830, found while researching Corpus Christi's own Mass immediately following it), but colitur's step 3 walks back to Trinity SUNDAY's own generic citation instead, since [ef-corpus-christi] (this task's own fix) now correctly interrupts the week at step 2, one Sunday short of what the week's own ferias actually need; (b) 2026-10-26/27/29/30 and 2027-11-03/05 (the ferias of the week Christ the King, I class movable, \"Dominica ultima octobris\", displaces) -- colitur's own citation on all six is LITERALLY Christ the King's own Gospel (John 18:33-37, \"Art thou a king?\"), confirming step 3 walked back to the DISPLACING feast, not the displaced ordinary Sunday; missalemeum shows a different citation each row. No Missal-propers rubric for Christ the King's own week ferias was found the way Holy Name/Holy Family's own each carry one (checked: no rubric text precedes Christ the King's own Mass heading, scan1.txt:39140-39163) -- this half is named from the OBSERVED citation evidence itself, not from a located propers rubric; no citation SPECIFIC to Christ the King's own week is claimed.
 
-Neither shape is safe to fix inside this task's own scope (extending layer 4 + triage) without the same real, dedicated, TDD/mutation-tested unit of work data/ef/expected-divergences.sexp's own C6/C25 and Task 6's own open item already call for -- a season-keyed ferial/votive-Mass-selection mechanism, new behaviour, not new data. Verdict open, the SAME fourth verdict M15/M18 already establish for a genuine comparator/architecture LIMIT, honestly counted and NAMED rather than silently absorbed, left failing, or buried in an unexplained residue. A literal date list, not a shape predicate: no single structural signal (unlike C17's own [subject = bvm]) distinguishes this population from a genuinely new, unrelated citation bug on some other Time-after-Pentecost feria. Derived directly from the OCaml comparator's own failure output, not hand-counted first and cross-checked after: 30.")
- (expected_rows 30))
+Neither shape is safe to fix inside this task's own scope (extending layer 4 + triage) without the same real, dedicated, TDD/mutation-tested unit of work data/ef/expected-divergences.sexp's own C6/C25 and Task 6's own open item already call for -- a season-keyed ferial/votive-Mass-selection mechanism, new behaviour, not new data. Verdict open, the SAME fourth verdict M15/M18 already establish for a genuine comparator/architecture LIMIT, honestly counted and NAMED rather than silently absorbed, left failing, or buried in an unexplained residue. A literal date list, not a shape predicate: no single structural signal (unlike C17's own [subject = bvm]) distinguishes this population from a genuinely new, unrelated citation bug on some other Time-after-Pentecost feria. Derived directly from the OCaml comparator's own failure output, not hand-counted first and cross-checked after: 30. NARROWED (movable-date-specs follow-up, 2026-08-17): 30 -> 27. SHAPE 2(a) is FIXED, not re-adjudicated -- the three ferias between Trinity Sunday and Corpus Christi now resolve at step 2 from the Mass the Missal itself prints for that week (scan1.txt:21758), under RG 299 explicit escape clause nisi a rubricis aliter provisum sit (scan1.txt:1096-1098). Those days still differ on observed-identity, being temporal-origin, and fall to M18 accordingly. SHAPE 2(b), Christ the King week, is NOT the same case and REMAINS -- but its verdict is now argued rather than merely open: no proper Mass is assigned there (checked directly, no rubric precedes that Mass heading at scan1.txt:39163ff), so RG 299 DEFAULT governs and the Mass of the preceding Sunday genuinely IS Christ the King own, which is what colitur emits. Read on the primary text colitur is right here and missalemeum diverges; kept open rather than closed only because no rubric SPECIFIC to that week was located either way.")
+ (expected_rows 27))
  ((id M27)
  (citation "tools/extract_missalemeum_oracle.py's own header (the extraction script, not an RG citation): Christmas Day has THREE Masses in the 1962 Missal (Midnight/Dawn/Day), each with its own distinct Epistle+Gospel; this fixture's own entry[0] convention (verified, and documented, for every OTHER field it reads) takes the Midnight Mass, while colitur's own citation (bootstrapped from lectio) reflects the Day Mass -- two DIFFERENT, both genuine, Masses of the identical civil day")
  (verdict colitur)