deterministic OCaml engine to compute and validate liturgical calendars for multiple rites, template-driven output to year 9999 https://git.labunix.xyz/colitur.git/atom?h=v1.2.0 2026-08-26T12:28:50Z 2026-08-26T12:28:50Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-26T12:28:50Z urn:sha1:e5cbc662227de4f3ab0089fe73f639f4f84601a4 I7 (final-review.md, 2026-08-25-colitur-of-phases-3-5): OF Sundays and solemnities shipped without the Second reading, and the lectionary data header called the First reading an "Epistle" -- EF vocabulary. The sole blocker was Validate's own kernel-hardcoded assertion that a well-formed day's sorted citation parts are exactly [First; Gospel]; Citation.part already carried Second. Rite.t gains citation_shapes : Citation.part list list, the fourth EF-shaped kernel misfit (after Preface.t, Mass_formulary.source, transfer_target's strictly-later contract) and the first fixed rather than only documented. EF supplies its one shape unchanged; OF supplies two, [First; Gospel] on a feria/feast/memorial and [First; Second; Gospel] on a Sunday or solemnity (OLM 1981 Praenotanda n. 66.1 vs n. 69.1, n. 84(b)/(c), page-image verified against olm-1981.pdf). Validate's "citations" check now matches against the rite's own declared shapes rather than a single literal pattern, preserving all three invariants it always enforced: zero or one complete shape, never partial; no part outside what the rite declares; no part repeated. bootstrap_lectionary_of.ml's cite now extracts a Second reading from Sunday-cycle ini sections only, correctly excluding the one stray `second` field lectio's snapshot carries on a weekday-cycle section (a content-verified scraping artifact). The hand-authored Christmas Day entry gains its own Second reading from the same OLM passage already cited for its First/Gospel. Regenerated data/of/lectionary.sexp: 771 entries unchanged, citation fields 1542 -> 1725 (+183, all Second readings), SHA-256 re-pinned, header wording fixed and a new coverage bullet added. Responsorial Psalm is deliberately still not emitted -- OLM 1981 Praenotanda n. 71 itself lists it apart from the readings proper as a chant with its own refrain, and the finding driving this change names only the missing Second reading. EF output verified byte-identical to the branch start (empty lib/rites/rite_ef + data/ef diff since v1.0.0, plus a direct binary comparison of `day`/`readings` for 2026, 1583 and 9999 against a worktree build of the pre-change commit). Tests: three new fixtures in test_validate.ml prove the generalisation holds both directions (a multi-shape rite accepts either of its declared shapes; a rite that never declared a shape still rejects it). test_citation_coverage_of.ml's pinned residual grows 41 -> 49, all new entries the same already-understood chapter-crossing shape. 2026-08-23T21:01:56Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-23T21:01:56Z urn:sha1:1252ffa57778331a67d75c2f69722b8ec1a7dbcc RG 497 ("in Missis festivis et votivis Apostolorum et Evangelistarum") carries no natalicium restriction, unlike RG 475(e)'s Creed clause -- preface_apostle_slugs already includes one non-natalicium sibling (In Commemoratione S. Pauli, 30 June) on this exact reasoning. conversion-of-st-paul (25 January) was left off pending a witness: the FIUV Ordo's own single window has 25 January impeded by a Sunday. Now witnessed four times, two independent publishers, four civil years: the Latin Mass Society Ordo's 2023-2024 and 2024-2025 editions both read "Pr of the Apostles" on their own unimpeded 25 January (2024, 2025); extraordinaryform.org's 2024-2025Ordo.pdf and 2026-2027Ordo.pdf independently agree on their own unimpeded years (2025, 2027, spot-checked, not wired in as a fixture). Every source's 2026 edition agrees 25 January is impeded that year and produces no data point at all. No source disagreed with the textual reading. Surveyed every other Apostle/Evangelist-named slug in data/ef/sanctoral.sexp before concluding the list needed exactly this one addition: the Dedication of the Basilicas of Sts Peter & Paul (18 November) is confirmed NOT an RG 497 trigger (all three LMS editions read "Pr of the Dedication of a Church", not "Apostles" -- it is about the buildings, not the Apostles in person); the Vigil of Sts Peter & Paul (28 June) is confirmed "Common Pr", corroborating the pre-existing "no vigil ever reaches this branch" comment. Blast radius, measured exhaustively (1583-9999, new permanent sweep in test_rubrics_ef.ml): 7217 domain years have 25 January unimpeded and observed; all 7217 now read Apostles, zero exceptions. Claude-Session: https://claude.ai/code/session_017ZBxCCRM2ojnBupp3SBxV9 2026-08-22T21:24:12Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T21:24:12Z urn:sha1:0806fe65e388a9502035bc9d4f551528ac74b26d Item 2 of Phase 3 (celebrant-rubrics-phase1), the bulk of this phase and the last EF Mass rubric this project scoped: which preface is said, deferring to seasonal/proper-title rules for the fourteen named prefaces, then RG 498's Common residual. RG 482 gives the resolution chain: the Mass's own proper preface, failing that the seasonal one, failing that Common. Read literally, RG 484-497 look like fourteen separate rules, but each numbered rubric's own propria/de-Tempore pair produces the SAME preface identity either way, so the whole chain collapses into one priority- ordered decision: title/mystery triggers (Holy Cross, Sacred Heart, Christ the King, Trinity, St Joseph, BVM, the Nativity octave, the Apostles, Epiphany), each independent of season, then six seasonal windows (Nativity, Epiphany, Lent, Holy Cross/Passiontide, Easter, Ascension, Holy Spirit, Trinity-for-ordinary-Sundays), then Common. The "one genuinely unproven piece" the design spec worried about -- per-feast proper prefaces extracted from the Missal's propers at scale -- turned out not to be a large-scale extraction problem at all: every one of the fourteen propers is a closed, small, subject/slug-keyed trigger (mirroring Precedence_ef.band's own RG 91 table), not thousands of individual saints' pages. The one genuine open question (RG 488, the Chrism Mass) is N/A: this engine resolves one Mass per civil day and has no separate Chrism-Mass dimension. Preface is a new kernel type (lib/kernel/preface.ml[i]), not an EF-specific one, the same placement as Colour/Subject/Mass_formulary: Liturgical_day.t is parameterised only over season/rank, so any field it carries generically must live in the kernel even though only EF constructs a value of it today. Wired exactly as creed/gloria were (Rite.t.preface, Calendar.ml, Rite_ef.context), but Preface.t option, not a bare bool: unlike creed/gloria, a preface is said only at a Mass, and Good Friday (1955-restored Holy Week) resolves an observed celebration but has no Mass at all -- None is the honest answer there, and also the neutral value an unimplemented rite returns. Two priority-order findings only the oracle settled, not derivable from the Latin text in isolation, both cross-checked against 358 individually classified entries in the FIUV Ordo's own praef column (test/fixtures/fiuv-ordo-2025-2026.sexp, already captured, wired up here as a new comparison axis): RG 484(b)'s own "except Masses with a proper of the divine mysteries or Persons" is narrower than every other window's implicit exception (an Apostle inside the Nativity octave is overridden to Nativity; outside it, keeps his own preface even inside another window); and RG 495's "et votivis" half is live for the one office this engine models without a votive-Mass dimension (the Saturday Office of the BVM), which also proved a vigil is not a "festum" for this purpose (the Assumption's own vigil takes Common, not BVM, correcting an initial reuse of Precedence_ef.marian_slugs that had no reason to make that distinction for its own, different rubric). A third, RG16(a)-shaped fix landed the same way: RG 494(b)'s own Trinity grant must read the day's TEMPORAL season, not the celebration that actually won it, or a Class1 feast with no preference of its own (All Saints) wrongly falls to Common on a Sunday it merely commemorates. colitur rubrics gains a sixth TAB-separated column. Domain-wide 1583-9999 exhaustive sweep confirms every Christmastide day resolves Nativity/Epiphany/Bvm, every Paschaltide day one of its own three windows or a season-independent title, every Lent day Lent or a title, and Passiontide legitimately produces Easter exactly once a year (the Vigil Mass) -- 8416 of the domain's 8417 years, the one short year being the domain's own upper boundary (the liturgical year opening in 9999 cannot construct dates in year 10000, a pre-existing edge this sweep re-confirms rather than a new one). day/readings verified byte-identical to the branch's own state before this phase (commit 9c96e0a) across a 455-year sample spanning the whole domain -- not literally to the v0.10.1 tag, which 22 earlier commits on this same branch (Phase 1/2, the bissextile shift, the Rogation colour fix) had already moved past before this phase began. 2026-08-22T18:15:56Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T18:15:56Z urn:sha1:cd3e03bf3e5b040786838fc3c5639d7c29e9b3b8 Temporal_ef.temporal's Rogation Monday/Tuesday branch hardcoded Colour.Violet with no citation (data/ef/expected-divergences-lms.sexp's L6, surfaced by the LMS Ordo). RG 119 assigns white to the de-Tempore Office and Mass from the Paschal Vigil Mass to the Pentecost Vigil Mass exclusive; Easter+36/+37 sit inside that window. RG 128's own exhaustive four-case violet list never names Rogation days, and its vigil clause (d) is doubly inapplicable: these are not vigils, and they are inside Paschaltide, not outside it. RG 88 explains the violet actually seen in print sources: "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. Witnessed directly: LMS Ordo 2023-2024, 2024-05-06, "FERIA IV Cl W" with "Gl", the Office and Mass printed separately from the optional violet votive Mass of the Rogations. Cascade verified, not assumed: RG 432(b) omits the Gloria on every violet Mass, so the wrong colour was also silencing the Gloria on these two weekdays even though RG 237(e) (Breviary, ordinary Paschaltide ferias say Te Deum) already made it true underneath. White removes the 432(b) block, and the Gloria now follows Te Deum via 431(a), matching the Ordo's own "Gl" -- confirmed with dedicated golden pins in both test_golden.ml (colour) and test_rubrics_ef.ml (the Gloria flip), 2028-05-22/23 (neither day impeded that year). Closed L6 in data/ef/expected-divergences-lms.sexp. Reopened C8 in data/ef/expected-divergences.sexp (26 of 16801 rows, 2005-2050): lectio independently computes these two days violet too, so the two engines used to agree by sharing the same uncited assumption; colitur's colour is now correct and lectio's is not, so the comparator disagrees again, for the opposite reason. While reopening C8, found and corrected a genuine misattribution in its own prior closure note, which claimed lectio's violet was "RG 128(d)" -- 128(d) governs vigils outside Paschaltide and has nothing to do with Rogation days. Checked docs/research/rules-register.md for the same claim: not present there, but a related conflation was found and corrected at its O'Connell section 4(d) note, which had used a Rogation MASS/procession citation to "confirm" the day's own OFFICE colour. Blast radius measured in-process across the full 1583-9999 domain (throwaway probe, not committed): 4722 days total (2368 Rogation Mondays + 2354 Rogation Tuesdays actually observed outright, i.e. not impeded by a stronger sanctoral feast that year), all Violet->White, all with the Gloria flipping false->true alongside, zero anomalies. Mutation-tested: reverting the branch to Colour.Violet reddens 16 tests across Rubrics_ef, the lectio differential, the LMS Ordo suite and both golden pin files; restored and reconfirmed green (680 tests). 2026-08-22T15:56:42Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T15:56:42Z urn:sha1:f4cc032d7e812d716ff6b5df8192f79a2560e8f0 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). 2026-08-22T14:40:24Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T14:40:07Z urn:sha1:60e87914718dd2c8e69bb89d8cc48d6bef9bfc74 The Missale Romanum's calendarium footnote for February (LT.txt:5011-5014, scan-corroborated scan2.txt:3050-3058): in a leap year the sixth kalends of March (24 February) is doubled rather than a 29th day appended, so St Matthias moves 24->25 February and St Gabriel of Our Lady of Sorrows 27->28, with 24 February itself carrying no fixed office that year. data/ef/expected-divergences-lms.sexp entry L3 tracked this as an open gap. Implemented as the rubric's own general mechanism (every fixed entry from 24 through 28 February shifts one civil day later in a leap year), not as "move these two named saints": the two readings are indistinguishable on shipped data (nothing else is fixed in that window) and diverge only for a future --overlay entry in the same range, which the mechanism reading covers correctly and a two-saints special case would not. This project has already been bitten once (RG 16(a)) by a rule implemented against shipped data's coincidental shape rather than the rubric itself. Kernel stays rite-agnostic: Rite.t gains a fixed_key field (Date.t -> (int * int) option), the same seam easter already establishes, read only by Layer.on_date's FIXED half -- the movable half (Easter_offset/Nth_weekday) is untouched. Default is the identity mapping, an optional argument on on_date, so every existing caller and every rite that supplies nothing is byte-identical to before this field existed. Date.is_leap is exposed in date.mli (already existed in date.ml) so the rite reads the kernel's own single-sourced leap-year definition. The EF implementation lives in Rite_ef.Temporal_ef.bissextile_fixed_key, fully cited, wired into Rite_ef.context. Blast radius, measured over the full 1583-9999 domain (Calendar.year run twice per civil year, real fixed_key vs identity, every day diffed): all 2,041 leap years in the domain show a visible change for each saint; 6,983 individual liturgical days change total, zero unclassified, across four shapes (Matthias vacates 24 Feb in 1,803 years / occupies 25 Feb in 1,811; Gabriel vacates 27 Feb in 1,699 / occupies 28 Feb in 1,670). L3's own prior estimate (1,650 years, observed-outright only) is confirmed close on the same definition (1,677 measured); the broader observed-or- commemorated count is higher, not lower, showing the narrow estimate undercounted visible impact rather than overcounting it. The lectio differential (2005-2050 fixture) gains a new cited entry, C40 in data/ef/expected-divergences.sexp: lectio implements no such shift, so every leap year in its window now diverges on the two shifted days (21 rows, not the naive 44 -- the comparator never compares commemorations, so a side where the shifted saint has zero comparator-visible footprint on both engines produces no row). The LMS Ordo's 2023-2024 fixture -- the window L3 was originally found in -- now matches on the Creed comparison; its formulary-override bucket count is corrected 182->181 (24 February leaves the counted Proper population, becoming Own_slug-sourced). The missalemeum oracle fixtures (2026-2027, 2038, 2035) cover no leap year and are unaffected. L3 is closed: converted from an active allow-list record to a prose closure paragraph (L1's own precedent), citation preserved verbatim, fix and measured blast radius recorded. The id-list assertion narrows to [L4] alone, and the now-dead "2024-02-24" -> "L3" date mapping is removed. Six golden values pinned across four new test cases: Matthias in a leap year (both the vacated and occupied sides) and a common-year control; Gabriel likewise, deliberately choosing a leap year where he is admitted only as an ordinary commemoration rather than winning outright, a different shape from Matthias's. Mutation-tested: forcing fixed_key back to identity reddens exactly five test cases -- the differential's Layer C count-pin (C40 drops to 0 actual vs 21 expected), the LMS Ordo's Creed and formulary-bucket checks, and both new golden pins -- confirming the tests actually exercise the fix. Reverted; dune test, the exhaustive sweep, and make check are all green. 2026-08-22T11:48:08Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T11:48:08Z urn:sha1:94ad73cf74d7f1cf02913e2f462c01028a8ef4b4 The .mli promised said is "the slug whose Mass is said". For Votive (RG 78/309(a), the Saturday votive Mass of Our Lady) it was set to the day's own ferial slug -- whose Mass is exactly the one NOT said. A consumer joining rubrics to readings on that slug would silently get the wrong Mass: 2026-01-03 reports ef-christmas-1-saturday, which has zero entries in data/ef/lectionary.sexp, because the citations actually come from bvm_saturday_citations, a season-keyed function with no slug of its own anywhere in the shipped data. Chose the type-honest fix over the interim documentation one: said is now Slug.t option, None exactly for Votive, because there is genuinely no slug in the shipped data this field could report for that one source. Adding real ids for the five seasonal BVM Masses (the reviewer's first option) is out of scope -- a data restructuring this round explicitly does not carry. Threading the office slug through a second field was considered and rejected as redundant: the day's own office is already available on the same Liturgical_day.t via observed.slug, which every caller already has in scope regardless of via, so said does not need to duplicate it. colitur rubrics stays byte-identical: rubrics_line already has d.observed in scope and falls back to its slug when said is None, printing the exact value it always printed for a Votive row (verified directly, diffed against pre-fix output across four years). colitur day/readings are unaffected (neither reads Mass_formulary at all). colitur emit --format sexp's pretty-printed line count for 2027 moved 9011 -> 9025: every day's formulary record widened by said's own extra option wrapping, and to_string_hum wraps by column width. Cosmetic only, diffed line by line to confirm every change is this shape or a consequent wrap shift; recorded in test/cli.t alongside the 476(f) note it now sits next to. 2026-08-22T11:38:27Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T11:38:27Z urn:sha1:41263d60432fadd2aef3f04de66b60561f89cbec colitur said the Creed IS said on All Souls' Day and every other Requiem-shaped day: RG 475(b)'s "in festis I classis" branch fired on rank alone, with nothing checking RG 476(f), "Non dicitur symbolum ... f) in Missis defunctorum". Allow-listed as L1 in expected-divergences-lms.sexp on the argument that [creed] has no notion of a Requiem Mass in its inputs and could not express the rule without a signature change. That argument does not hold. Colour.Black is used by exactly two celebrations in the whole engine, verified by grepping every occurrence in lib/ and data/: commemoration-of-all-souls (data/ef/sanctoral.sexp) and Good Friday (temporal_ef.ml, already false via the earlier RG 23(b) feria exclusion and has no Mass at all in the 1955-restored Holy Week). So on every day this engine can construct, colour = Black if and only if the Mass is a Requiem -- a citable implication (RG 117 assigns black to Masses of the dead) on this data, not a heuristic. Rite_ef.Rubrics_ef.creed now reads observed.colour as RG 476(f)'s own guard, positioned ahead of 475(b)'s rank branch. A new test, test_colour_black_population_is_exactly_two, sweeps both the shipped data and Temporal_ef's own code across a century and fails loudly the day a third Colour.Black celebration is ever introduced, so the proxy cannot silently rot. L1 is closed in expected-divergences-lms.sexp, citation preserved. Blast radius, measured (full 1583-9999 sweep, grouped by observed slug): 8 416 days change from true to false, every one commemoration-of-all-souls (missing from exactly 1 of the 8 417 domain years, a boundary-year transfer effect at 1583/9999). A further 8 416 Colour.Black days are Good Friday, unaffected (already false before this fix). colitur day/readings stay byte-identical to v0.10.1 (checked directly against a v0.10.1 worktree build, 9 domain-spanning years); colitur rubrics changes on exactly the 8 416 days above. colitur emit --format sexp's pretty-printed line count for 2027 moved 9010 -> 9011 as a side effect: Sexplib.Sexp.to_string_hum wraps by column width, and All Souls' Day 2027's record grew one wrapped line because "false" is one character longer than "true". Cosmetic only -- no field's data changed -- and pinned in test/cli.t with the measurement recorded. 2026-08-22T10:29:06Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T10:29:06Z urn:sha1:89b6cfbc8c2a9f5921c19543f893decc2497ef69 rubrics_ef.ml's Creed check excluded feriae from 475(b)/(c)/(e) via an explicit test for feria I classis (Ash Wednesday, Holy Week) and vigils only. RG 24/25's feriae II and III classis (Advent 17-23 December, the Advent/Lent/September Ember sets, the numbered Lenten/Passiontide ferias) were excluded by no check at all, correct today only because of an unstated Temporal_ef property (no ferial-origin office it builds carries subject Lord/Bvm or an apostle-list slug). A comment read as if this were established "by construction of the two exclusions immediately above", which overclaimed: those two exclusions cover feria I classis only. Corrected the comments to name RG 24/25 explicitly, state what is and is not checked, and cite where the real guarantee comes from. Added a test that sweeps Temporal_ef.temporal across a century (1583-1682), asserting the invariant directly against every ferial-origin day found, with its own coverage counters confirming the span actually reaches Advent 17-23, all three non-Whitsun Ember sets, and Lenten/Passiontide ferias. The first run of the test found a real gap in its own population filter (RG 17(a)'s 2 January Holy Name fallback, a genuine feast sitting outside Temporal_ef.named for an architectural reason), fixed by naming that date explicitly rather than narrowing the span. Proved the test has teeth by mutation: forcing the ferial builder's default subject to Lord reddened it (and 24 other tests, expected collateral from an intentionally broad mutation) before being reverted. No production logic changed -- only comments in rubrics_ef.ml. day, readings and rubrics output confirmed byte-identical against the pre-fix binary for four spot years across the domain. Also corrects a stale test-case count in a prior task report (18 in the array, not the 19 recorded there); the array now genuinely holds 19. 2026-08-22T10:02:01Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T10:01:48Z urn:sha1:d4682c13161b62bc83eaae37790493f670d39c01 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.