feat(ef): the Creed, RG 475-476

Whether the Creed is said at Mass. New Rubrics_ef.creed, reached through
a new Rite.t.creed field and a new Liturgical_day.t.creed bool (false,
not an option, for a rite that has not implemented the rule); colitur
rubrics gains a fourth TAB-separated column.

475(a) reads the TEMPORAL cycle's own weekday, not the observed day: a
Sunday impeded by a Feast of the Lord (RG 16a) still says the Creed.
475(d)'s three octaves (Nativity, Easter, Pentecost) are pure date/
Easter-offset windows, checked first, since a saint's feast winning the
day inside one of them still says the Creed ("etiam in festis
occurrentibus") -- St Stephen, 26 December, is the live witness.

RG 23 classifies Ash Wednesday and every feria of Holy Week (including
the Sacred Triduum) as feriae, not festa, however high their rank, so
475(b)/(c)'s "in festis" never reaches them; this single check subsumes
476(a)'s own naming of the Chrism/Lord's-Supper Mass and the Easter
Vigil. RG 28-34 vigils are a third liturgical-day category, also
excluded from "in festis" regardless of rank -- reuses the already-
exported Precedence_ef.is_vigil rather than a new list.

475(e)'s Apostle/Evangelist natalicia list (creed_apostle_slugs) was
derived by grepping data/ef/sanctoral.sexp directly and checking each
candidate's own date against whether it is that saint's dies natalis --
not copied from any list supplied with the task. The Conversion of St
Paul and the 30 June Commemoration of St Paul are excluded (neither is
a natalicium); the Chair of St Peter and St Barnabas are included only
because the clause names them explicitly, which is exactly why it has
to: neither is a natalicium either.

475(c)'s BVM half reuses Precedence_ef.marian_slugs (newly exported)
rather than the subject field alone: checked against the shipped data,
almost every Marian sanctoral entry ships subject=Saint, not Bvm.

man/colitur.1's rubrics section is updated to match the new column;
test/cli.t repinned via dune promote for the same reason. Verified
day/readings output byte-identical to v0.10.1 across the whole
1583-9999 domain (both binaries' concatenated day+readings output,
6,148,492 lines each, zero diff). Domain-wide: 882,996 days say the
Creed, 2,191,250 do not; every one of the domain's 439,178 Sundays says
it, zero exceptions.

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/rites/rite_ef/precedence_ef.mli b/lib/rites/rite_ef/precedence_ef.mli
index 4c2523a..0100d40 100644
--- a/lib/rites/rite_ef/precedence_ef.mli
+++ b/lib/rites/rite_ef/precedence_ef.mli
@@ -132,6 +132,22 @@ val sunday_marker : string
     recognising a live candidate again. *)
 val major_litanies_slug : string
 
+(** RG 112(d)'s own closed, hand-verified list of sanctoral entries that are
+    themselves a feast/commemoration OF the Blessed Virgin Mary in her own
+    right -- see the .ml's own citation for the full derivation and the
+    entries considered and excluded. A celebration is "of the BVM" for
+    {!disposition}'s RG 112(d) branch when its [subject] is [Subject.Bvm] OR
+    its slug is on this list ({!Celebration.t}'s [subject] field is NOT
+    reliably [Bvm] for most Marian sanctoral entries -- bootstrapped from
+    lectio, most carry [Saint] instead, this list is the reliable signal).
+
+    Exposed (task 5, the Creed, RG 475(c) "festis II classis... B. Mariae
+    Virg.") so a second rite-local consumer can test the identical
+    Marian-identity question without re-deriving its own list and risking
+    drift from this one -- the same reasoning {!vigil_feast_table} and
+    {!is_vigil} are already exposed for. *)
+val marian_slugs : string list
+
 (** [disposition ~winner ~loser]: RG 92-95, 33, 21-27, 94 (docs/research/
     rules-register.md §4, "Occurrence", "Vigils" and "Caput IV, 'De
     feriis'"). What becomes of a losing candidate, decided by the LOSER's