test(ef): the LMS Ordo as a sixth validation layer

An independent lineage -- neither Divinum Officium, missalemeum nor
lectio -- covering the Mass formulary and the Creed. Characterised
before use, per the discipline the extraordinaryform.org Ordo's
blanket St Lawrence vigil gap taught this session: five opposite-
prediction Creed probes (Sunday/feria, octave-override vs plain
II-class, I-class) all confirmed against the raw extracted text
before a single divergence was adjudicated, recorded in the
fixture's own provenance header.

tools/extract_lms_ordo.ml hand-parses pdftotext -layout output (no
Str/regex, frozen deps) into test/fixtures/lms-ordo-2024-2025.sexp,
400 day-rows (2024-11-27..2025-12-31). Gl/Cr print per Mass-option,
not per day; the extractor takes the first pair in reading order,
which the source's own layout guarantees is the universal entry's,
since a diocesan variant always follows it, never precedes it. The
Ordo's I-V roman numeral ("Missae de sancta Maria in sabbato", RG
309(a)) is matched whole-line only, never by substring -- "V Mass of
BVM" is a substring of "IV Mass of BVM".

test/test_lms_ordo.ml compares two axes 1:1 by date:
  - the Creed (RG 475-476): 399 of 400 days comparable (Good Friday
    has no Mass at all, asserted as the only such day); one genuine
    divergence, adjudicated to the ORDO, not colitur -- All Souls'
    Day 2025-11-03 is a Requiem Mass, and colitur's own creed
    predicate has no notion of one, a pre-existing scope gap
    rubrics_ef.ml already documented in its own header before this
    task existed.
  - the BVM-Saturday seasonal Mass selection, the addendum's own
    "sharper check": all 14 Votive days in the window match their
    season's own numeral exactly, both directions, independently
    re-derived from RG 309(a) rather than calling colitur's private
    function.
  - the formulary override, for the three sources it can honestly
    discriminate (Proper 179, Preceding_sunday 66, Common 2, all
    clean); Own_slug (139) is excluded with evidence, not silently --
    several ferial slugs carry citations byte-identical to their
    Sunday's own, so the Ordo's override line cannot distinguish the
    two representations.

data/ef/expected-divergences-lms.sexp carries the one adjudicated
entry (L1), cited to RG 476(f).

Mutation-tested: inverting RG 475(a)'s Sunday clause reddens 10
existing Rubrics_ef unit tests AND this new layer's own comparator,
independently, on a data source none of the other five layers touch.
Reverted after confirming.

No lib/ changes. day/readings/rubrics output re-confirmed byte-
identical (1583, 2026, 2038, 9999) after this task; all three gates
green (dune test, exhaustive sweep, make check).

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