feat(ef): the Gloria in excelsis, RG 431-432, deferring to Breviary 237-238

Phase 2 of celebrant-rubrics-phase1: colitur rubrics gains a fifth
column, whether the Gloria is said. Follows the Creed's own seam
exactly -- Rite.t.gloria, Liturgical_day.t.gloria, wired through
calendar.ml the same way.

RG 431(a)/432(a) defer the Gloria to the Breviary's own Te Deum rule
(nn. 237-238), so te_deum is implemented as its own named predicate,
cited clause by clause, not collapsed into a colour heuristic. 431(c)
(Holy Thursday, the Easter Vigil Mass) and 432(b)/(d) (violet; a
Requiem) are independent overrides checked ahead of the Te Deum-derived
answer. Every clause this engine has no dimension to model
(votive Mass classes, the wider n.302 "Missa festiva" categories) is
stated as N/A with its own reasoning, not silently dropped.

Validated against the FIUV universal Ordo (Gloria and Te Deum) and all
three LMS editions (Gloria). A first pass over-trusted a clean-looking
15-for-15 FIUV contradiction of 237(b)'s own Septuagesima exception and
replaced it with a blanket "every Sunday" rule; the evidence was itself
corrupted -- the FIUV extractor recognised only one of the source's two
Te Deum negations ("non dicitur", not "sine"), so every "sine Te Deum"
Sunday read wrongly true. Fixed in tools/extract_fiuv_ordo.ml, fixture
re-extracted, and the literal 237(b) reading restored once the
corrected data confirmed it. A second bug surfaced alongside it (Palm/
Passion Sunday wrongly reading true via Temporal_ef.named's own table
membership, then Christ the King wrongly reading false from an
over-broad fix) is closed with an explicit two-slug exclusion.

Domain-wide 1583-9999: every violet or Rose day is gloria=false except
the Easter Vigil (RG 431(c) lex specialis), every Requiem is
gloria=false, both measured exhaustively, zero exceptions. Mutation-
proved: disabling 431(c) reddens 8 tests including all four oracle
comparisons; disabling 238(c)'s feria-I-classis exclusion reddens
exactly the dedicated Ash Wednesday unit test, a genuine blind spot in
both oracle layers, reported rather than hidden.

Two open, cited findings, neither fixed here (out of this task's
"follow creed's exact seam" scope): a privileged Lenten/Passiontide
feria carrying one commemoration reads Gloria=true in the LMS Ordo but
Te-Deum=true/Gloria=false in FIUV -- the two oracles disagree with each
other, not merely with colitur (data/ef/expected-divergences-lms.sexp
L5, expected-divergences-fiuv.sexp F3); and a pre-existing, uncited
Colour.Violet bug on Rogation Monday/Tuesday in Temporal_ef.temporal,
surfaced by this comparison but root-caused as a separate defect (L6).

day/readings verified byte-identical against a build from the branch
tip before this task (v0.10.1's own tag predates an already-landed
bissextile fix that legitimately changed both, so it is not the right
baseline).

671 tests green (dune test); 678 with the exhaustive sweep
(COLITUR_EXHAUSTIVE_SWEEP=1 dune test --force, ~104s).

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/rites/rite_ef/rubrics_ef.mli b/lib/rites/rite_ef/rubrics_ef.mli
index 7a1284b..618af65 100644
--- a/lib/rites/rite_ef/rubrics_ef.mli
+++ b/lib/rites/rite_ef/rubrics_ef.mli
@@ -38,3 +38,33 @@ val creed :
   observed:Vocab_ef.rank Celebration.t ->
   date:Date.t ->
   bool
+
+(** Whether the Te Deum was said at Matins (Breviary 1961 Codex Rubricarum
+    nn. 237-238) -- NOT the Divine Office arriving in scope, but a single
+    Breviary fact {!gloria}'s own RG 431(a) defers a Mass question to. See
+    the .ml's own header for the rubric quoted in full, every branch's own
+    citation, and this source's own stated weakness (a single, not yet
+    scan-verified, web transcription -- docs/research/breviary/PROVENANCE.md).
+    Same three parameters as {!creed}, for the same reasons: [temporal] for
+    the day's own weekday/season, [observed] for the celebration whose
+    Office is actually kept, [date] for the Easter-relative window
+    questions. *)
+val te_deum :
+  temporal:(Vocab_ef.season, Vocab_ef.rank) Temporal.t ->
+  observed:Vocab_ef.rank Celebration.t ->
+  date:Date.t ->
+  bool
+
+(** Whether the Gloria in excelsis is said at this day's Mass (RG 431-432).
+    431(a)/432(a) defer to {!te_deum}; 431(c) (Holy Thursday, the Easter
+    Vigil Mass) and 432(b)/(d) (violet vestments; a Requiem) are
+    independent overrides, checked ahead of the Te Deum-derived answer --
+    see the .ml's own header for the full account, including which of
+    431/432's own clauses this engine has no votive-Mass-class dimension to
+    implement and are therefore marked not-applicable rather than silently
+    skipped. *)
+val gloria :
+  temporal:(Vocab_ef.season, Vocab_ef.rank) Temporal.t ->
+  observed:Vocab_ef.rank Celebration.t ->
+  date:Date.t ->
+  bool