fix(ef): ferias after the Ascension repeat its own Mass, not a Sunday's

Ascension has no octave under the 1960 rubrics -- confirmed structurally:
the Proprium de Tempore's own table of contents runs straight from "In
Ascensione Domini" to "Dominica post Ascensionem" with no per-feria
headings in between. Step 3 of the reading chain therefore fell through
to Preceding_sunday on every unoccupied weekday in that stretch, walking
each one back to the 5th or 6th Sunday after Easter's own citation.

The Missal's own Proprium de Tempore carries an explicit marginal rubric
immediately after the Ascension's Mass propers, before "Dominica post
Ascensionem" begins: "Diebus a feria VI post Ascensionem usque ad feriam
VI ante vigiliam Pentecostes inclusive, dicitur Missa de festo
Ascensionis, cum Gloria et praefatione de Ascensione, sine Credo et
Communicantes proprio" -- every feria without its own proper, from the
Friday after the Ascension through the Friday before the Vigil of
Pentecost, repeats the Ascension's own Mass. RG 490(b) corroborates
independently: it assigns the Ascension preface "tamquam de Tempore"
across that identical window, which only makes sense if the Mass
actually repeated there is the Ascension's, not a numbered Sunday's
(whose own Mass would carry no need for a preface override at all).

Witnessed directly, not only inferred from the rubric: the LMS Ordo
prints "Mass of the Ascension" literally on every affected day across
all three of its fixture windows, in BOTH the tail of Ascension's own
week and the following week -- ruling out the alternative reading (that
the second week instead resumes "Dominica post Ascensionem"'s own Mass,
which a first pass over the FIUV Ordo's own week-labelled titles could
suggest at a glance; its own [praef] field for the same two dates
independently reads "Ascensionis", resolving the apparent conflict).

Implemented as data, not logic, matching this codebase's own established
precedent for the identical RG 299 shape (the week after Trinity Sunday,
data/ef/lectionary.sexp's [trinity_week_entries]): six new hand-authored
entries, [ascension_week_entries] in tools/bootstrap_lectionary.ml,
regenerated against a git-pinned copy of lectio's own source ini (SHA-256
verified unchanged) so the regeneration carries no unrelated drift. The
window's two Saturdays are deliberately excluded -- RG 78's votive Office
of Our Lady on Saturday always wins an otherwise-unoccupied Class4
Saturday first, before step 2 (this fix's own entry point) is ever
reached, so an entry for either slug would be dead data.

Blast radius measured in-process across the full 1583-9999 domain
(throwaway probe, not committed): 16 350 days total across the six
slugs, every one resolved via step 2 (Own_slug), zero anomalies, and the
window's two Saturdays confirmed to contribute zero hits via this cause
across the whole domain, corroborating the RG78-interception reasoning
by direct sweep.

Closed L2 in data/ef/expected-divergences-lms.sexp. New cited entries:
C41 in data/ef/expected-divergences.sexp (95 of 16801 rows, 2005-2050 --
lectio has no equivalent rubric and still walks these ferias back);
M31 in data/ef/expected-divergences-missalemeum.sexp (3 rows in the
2026-2027 window, plus the same shape independently reconfirmed in the
2035 and 2038 live-capture windows) -- missalemeum, Divinum Officium's
lineage, still gives the same wrong answer colitur itself used to give,
which is why these rows used to agree with M18's shape and now escape it
(M18 373 -> 370, the same mechanism M23-M27 established when the
citation axis was first built).

Golden pin: 2031-05-23, the exact date the bug report was filed against.

Mutation-tested: reverting data/ef/lectionary.sexp alone (a git-diff
capture/restore, not a source-code revert, since the fix is data) reddens
19 tests across the differential, both oracle fixtures, all three LMS
Ordo windows, the golden pin, the lectionary unit test and every Render
golden template; restored and reconfirmed green (681 tests; 683 under
COLITUR_EXHAUSTIVE_SWEEP=1, ~175s).

1 files changed, 11 insertions, 0 deletions

diff --git a/data/ef/expected-divergences.sexp b/data/ef/expected-divergences.sexp
index f98409b..ca0d6a3 100644
--- a/data/ef/expected-divergences.sexp
+++ b/data/ef/expected-divergences.sexp
@@ -131,6 +131,17 @@ Diff shapes: most rows carry [Slug_f; Rank; Colour_f; First_f; Gospel_f] (the te
 
 BLAST RADIUS, MEASURED, full 1583-9999 domain (not merely this fixture's 2005-2050 window): 6 983 liturgical days change, zero unclassified, across all 2 041 leap years in the domain -- see data/ef/expected-divergences-lms.sexp's own now-closed L3 entry for the full figures (this entry's own 21-row 2005-2050 population is the expected subset of that domain-wide count landing inside the fixture's own window: 11 leap years x up to 2 new rows each, minus the three already-explained overlaps above).")
   (expected_rows 21))
+ ((id C41)
+  (citation "The Missale Romanum's own Proprium de Tempore carries an explicit marginal rubric immediately after the Ascension's own Mass propers, before \"Dominica post Ascensionem\" begins (scan1.txt:20749-20754, both scans corroborate): \"Diebus a feria VI post Ascensionem usque ad feriam VI ante vigiliam Pentecostes inclusive, dicitur Missa de festo Ascensionis, cum Gloria et praefatione de Ascensione, sine Credo et Communicantes proprio\" -- on the days from the Friday after the Ascension until the Friday before the Vigil of Pentecost inclusive, the Mass OF THE FEAST OF THE ASCENSION is said. Corroborated by RG 490(b) (LT.txt:3981-3985), which assigns the Ascension preface \"tamquam de Tempore\" to every Mass in that same window lacking a proper preface -- consistent only if the Mass repeated is the Ascension's own, not a numbered Sunday's. Witnessed directly: the LMS Ordo prints \"Mass of the Ascension\" literally across all three fixture windows (data/ef/expected-divergences-lms.sexp's own L2, closed by this entry) on every affected day of BOTH weeks, and the FIUV Ordo's own [praef] field independently reads \"Ascensionis\" on the two analogous 2025-2026 dates its title labels by week rather than by formulary. Implemented in data/ef/lectionary.sexp's [ascension_week_entries] (tools/bootstrap_lectionary.ml), celebrant-rubrics-phase1 Bug 2, 2026-08-22.")
+  (verdict colitur)
+  (note "lectio has no equivalent rubric: it walks the six affected ferias back to the nearest preceding Sunday's Mass (5th Sunday after Easter for [ef-easter-6-friday], Dominica post Ascensionem for the five [ef-easter-7-*] weekdays), the SAME wrong answer colitur used to give before this fix. Both sides agree on slug, season (Layer A normalises colitur's [paschaltide] and lectio's [easter] as the same vocabulary), rank and colour throughout -- only the citation text differs, so every row carries [First_f; Gospel_f] alone.
+
+MEASURED (test_differential.ml's own [classify], 2005-2050 fixture, run directly): 95 rows, all six slugs represented, zero unclassified. Population varies year to year (0-3 of the six slugs fire per year) because most years have a real sanctoral feast occupying one or more of the six candidate civil dates -- the same reason data/ef/expected-divergences-lms.sexp's own L2 found only 1-3 affected days per its own one-year fixture windows, now confirmed at scale across the full 46-year differential window.
+
+The window's two Saturdays (Easter+41, Easter+48) never reach this entry: Easter+48 is the Vigil of Pentecost, a named day with its own Mass, outside the rubric's own upper bound; Easter+41 is an ordinary Class4 Saturday, so RG 78's votive Office of Our Lady on Saturday intercepts it before the lectionary lookup this entry's own fix touches is ever reached (readings' own step ordering) -- confirmed directly: no row in the 95 carries [ef-easter-6-saturday] or [ef-easter-7-saturday].
+
+BLAST RADIUS, MEASURED (full 1583-9999 sweep, in-process against {!Colitur_kernel.Calendar.year}, throwaway probe, not committed): 16 350 days total, split ef-easter-6-friday 2 562, ef-easter-7-monday 2 618, ef-easter-7-tuesday 2 744, ef-easter-7-wednesday 2 776, ef-easter-7-thursday 2 781, ef-easter-7-friday 2 869 -- every one resolved via step 2's Own_slug, zero anomalies, and the window's two Saturdays confirmed to contribute zero Own_slug hits via this cause across the whole domain (RG 78's votive Office of Our Lady always intercepts first), corroborating the code-level reasoning above by direct sweep rather than inspection alone.")
+  (expected_rows 95))
  ((id C8)
   (citation "RG 119 (Caput XVIII, \"De Colore Paramentorum\"): white is used \"in Officio et Missa de Tempore ... a Missa Vigiliae paschalis usque ad Missam vigiliae Pentecostes exclusive\" -- the de-Tempore Office and Mass are white from the Paschal Vigil Mass until the Pentecost Vigil Mass exclusive, and Rogation Monday/Tuesday (Easter+36/+37) sit inside that window. RG 128's own exhaustive four-case list for violet (Advent I-Christmas Eve; Septuagesima-Paschal Vigil; the September Ember ferias; vigils of II/III class OUTSIDE Paschaltide) never names Rogation days. RG 88 (\"de Litaniis minoribus nihil fit in Officio, sed tantum in Missa\"): the violet belongs to the Rogation MASS/procession, a distinct votive text this engine does not model, not to the day's own Office. Fixed in Rite_ef.Temporal_ef.temporal's Rogation branch, celebrant-rubrics-phase1 Bug 1, 2026-08-22 -- see that branch's own citation and data/ef/expected-divergences-lms.sexp's now-closed L6 entry, which is what surfaced it (LMS Ordo 2023-2024, 2024-05-06, \"FERIA IV Cl W\").")
   (verdict colitur)