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, 9 insertions, 9 deletions

diff --git a/test/cli.t b/test/cli.t
index 398c6fb..ac1351b 100644
--- a/test/cli.t
+++ b/test/cli.t
@@ -210,9 +210,9 @@ separate command for the same mechanical reason `readings` is: `day`'s row
 is fixed-width space-separated with a variable-length "+slug" tail.
 
   $ colitur rubrics 2026 | head -3
-  2026-01-01	ef-circumcision	own
-  2026-01-02	ef-christmas-1-friday	own
-  2026-01-03	ef-christmas-1-saturday	votive
+  2026-01-01	ef-circumcision	own	true
+  2026-01-02	ef-christmas-1-friday	own	false
+  2026-01-03	ef-christmas-1-saturday	votive	false
 
   $ colitur rubrics 2026 | wc -l
   365
@@ -224,19 +224,19 @@ apply to it -- step 2 does (the day's own temporal slug in the lectionary),
 tagged `own`. Contrast a real sanctoral saint with his own proper:
 
   $ colitur rubrics 2038 | grep '^2038-03-08'
-  2038-03-08	john-of-god	proper
+  2038-03-08	john-of-god	proper	false
 
 A saint with no proper of his own says his assigned Common (step 4):
 
   $ colitur rubrics 2038 | grep '^2038-03-06'
-  2038-03-06	common-of-non-virgins-1	common
+  2038-03-06	common-of-non-virgins-1	common	false
 
 A weekday with no proper of its own resumes the preceding Sunday's, never
 its own observed slug -- 1 December 2025 is the Monday after Advent I, and
 Advent's ferias have no Mass of their own (step 3):
 
   $ colitur rubrics 2025 | grep '^2025-12-01'
-  2025-12-01	ef-advent-sunday-1	preceding-sunday
+  2025-12-01	ef-advent-sunday-1	preceding-sunday	false
 
 3 January 2026 above ("votive") is the RG 78/309(a) Saturday Mass of Our
 Lady, said IN PLACE of the day's own office's Mass while the office (an
@@ -257,9 +257,9 @@ diocesan overlay's local patron observed instead (no proper or Common of his
 own in the fixture), the chain falls all the way back to step 3:
 
   $ colitur rubrics 2026 --overlay fixtures/overlay-example-diocesan.sexp | grep '^2026-07-11'
-  2026-07-11	ef-time-after-pentecost-sunday-6	preceding-sunday
+  2026-07-11	ef-time-after-pentecost-sunday-6	preceding-sunday	false
   $ colitur rubrics 2026 | grep '^2026-07-11'
-  2026-07-11	ef-time-after-pentecost-6-saturday	votive
+  2026-07-11	ef-time-after-pentecost-6-saturday	votive	false
 
 `--lang`/`--raw`/`--sigla-*` are refused rather than silently ignored, unlike
 `readings`: this row resolves no display name and no citation for any of
@@ -537,7 +537,7 @@ CSV run rather than one per year:
 sexp and xml are also available:
 
   $ colitur emit --format sexp --from 2027 --to 2027 | wc -l
-  8881
+  9010
 
   $ colitur emit --format xml --from 2027 --to 2027 | head -2
   <?xml version="1.0" encoding="UTF-8"?>