merge: celebrant Mass rubrics, and four rubrical corrections

colitur now prints what a real ordo prints for the Mass: which formulary is
said and how it was reached, the Gloria, the Creed, the preface, and the
commemorations with their Low-Mass/sung distinction. colitur rubrics joins
day and readings.

Four defects were found and fixed on the way, each by an external witness
rather than by inspection: the Creed said at Requiem Masses (RG 476(f)),
the missing bissextile shift of St Matthias and St Gabriel (2 041 leap
years), Rogation Monday and Tuesday coloured violet in Paschaltide (RG
119(b)), and the ferias after the Ascension resuming the wrong Sunday's
Mass rather than the Ascension's.

Validation gained a sixth layer and then some: the preface is checked
against three independent publishers over seven witness-years (FIUV, three
LMS editions, three extraordinaryform.org editions), none of which shares
the Divinum Officium -> missalemeum -> lectio lineage the older layers all
descend from.

1 files changed, 70 insertions, 0 deletions

diff --git a/tools/bootstrap_lectionary.ml b/tools/bootstrap_lectionary.ml
index 7df290b..1e9b8ed 100644
--- a/tools/bootstrap_lectionary.ml
+++ b/tools/bootstrap_lectionary.ml
@@ -637,6 +637,75 @@ let trinity_week_entries =
        lectionary has been bitten by before. *)
     [ "monday"; "tuesday"; "wednesday"; "friday"; "saturday" ]
 
+(* RG 299's own escape clause, second instance (celebrant-rubrics-phase1,
+   Bug 2, 2026-08-22). The 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 (with the Gloria and
+   the Ascension preface, without the Creed and the proper
+   Communicantes). Corroborated independently 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 of its own --
+   consistent only if the Mass repeated there is the Ascension's own,
+   not a numbered Sunday's (which would need no preface override at
+   all).
+
+   Witnessed directly, not merely inferred from the rubric: the LMS Ordo
+   prints "Mass of the Ascension" literally, across all three fixture
+   windows this project has built (2023-2024: 1 day; 2024-2025: 3 days;
+   2025-2026: 2 days -- data/ef/expected-divergences-lms.sexp's own L2,
+   closed by this entry), on EVERY affected day in BOTH the remainder of
+   Ascension's own week and the following week, not only the first --
+   ruling out the alternative reading that the second week instead
+   resumes "Dominica post Ascensionem"'s own Mass. The FIUV Ordo's own
+   title convention for these days (2025-2026 fixture, 2026-05-21/22,
+   "Feria V/VI Dom. post Ascensionem, De ea") could look like the
+   opposite at a glance -- it is not: FIUV's title names which WEEK a
+   feria belongs to (a bookkeeping label, the same role colitur's own
+   week-numbered slug plays), while its own [praef] field for those
+   exact two days independently reads "Ascensionis", confirming the Mass
+   actually said is still the Ascension's, exactly as the marginal
+   rubric and RG 490(b) both require.
+
+   The window's two Saturdays (Easter+41, Easter+48) are DELIBERATELY
+   NOT given entries here. Easter+48 is the Vigil of Pentecost, a named
+   day with its own Mass ({!Rite_ef.Temporal_ef.named}), outside the
+   rubric's own "usque ad feriam VI" upper bound. Easter+41 is an
+   ordinary IV-class Saturday, so {!Rite_ef.Lectionary_ef.readings}'s
+   own RG 78/RG 309(a) votive-Mass-of-Our-Lady-on-Saturday branch ALWAYS
+   intercepts it before step 2 is ever reached (checked directly:
+   [is_bvm_saturday_office] fires unconditionally on any unoccupied
+   Class4 Saturday, which every ordinary Paschaltide Saturday is) -- an
+   entry for either Saturday slug would be dead data that
+   [assert_reachable] cannot catch (both slugs it would name ARE real,
+   reachable Temporal_ef offices; the shadowing happens one level up, in
+   [readings]' own step ordering, not in slug reachability).
+
+   Six ferias, matching the Ascension's own citation already given above
+   (Act. 1, 1-11 / Marc. 16, 14-20, scan1.txt:20701-20730,
+   [ef-ascension]'s own entry): the one remaining non-Saturday day of
+   Ascension's own week (Easter+40) and the five weekdays of the
+   following week (Easter+43..47), bounded above by that week's own
+   Friday -- the Saturday after it is the Vigil of Pentecost, named,
+   never reaching this table. *)
+let ascension_week_citations = pair ~first:"Acts 1:1-11" ~gospel:"Mark 16:14-20"
+
+let ascension_week_entries =
+  List.map
+    (fun slug -> (slug_or_die slug, ascension_week_citations))
+    [ "ef-easter-6-friday";
+      "ef-easter-7-monday";
+      "ef-easter-7-tuesday";
+      "ef-easter-7-wednesday";
+      "ef-easter-7-thursday";
+      "ef-easter-7-friday"
+    ]
+
 let epiphanytide_opening_entries =
   List.concat_map
     (fun (family, wds, cs) ->
@@ -789,6 +858,7 @@ let () =
     translated @ vigil_entries @ holy_week_entries @ passion_tuesday_entry
     @ ember_saturday_corrections @ nativity_octave_entries @ holy_name_entries
     @ epiphanytide_opening_entries @ trinity_week_entries @ movable_feast_entries
+    @ ascension_week_entries
   in
   assert_reachable entries;
   let lect =