test(fiuv-ordo): add the FIUV universal Ordo as a second, independent witness

Wires in the FIUV (Foederatio Internationalis Una Voce) Ordo for
2025-2026 as validation layer seven -- the first UNIVERSAL (not
diocesan) source in this project, and the first compiled by someone
other than the LMS editions' own Peter Day-Milne (Joseph Shaw, FIUV
President).

tools/extract_fiuv_ordo.ml hand-parses pdftotext's -layout dump of the
Latin-language ordo (no Str/regex, frozen deps). Three real parsing
traps were found and fixed by tracing actual false results against the
raw source, not assumed in advance:

- "Gloria" is also the first word of "Gloria Patri" (the psalm
  doxology), which can appear INSIDE the very Mass clause being scanned
  (Good Friday: "...omittuntur ps. Iudica me et Gloria Patri), Gloria,
  sine Credo..."). Guarded by rejecting any "Gloria" hit whose next
  token is "Patri".
- Christmas Day's own rubric uses the PLURAL "Missae"/"Missae" ("tres
  Missae celebrantur..."), never the singular "Missa" every other real
  day anchors on -- silently produced gloria=None/credo=None on the one
  most doctrinally unambiguous day in the calendar until traced and
  fixed, guarded in turn against "Missae defunctorum" (an unrelated
  Requiem-prohibition notice appearing at the end of many day-blocks).
- The Vespers boundary (bounding the primary Mass option before a
  second "Vel Missa" alternative or before Vespers information) missed
  the ligature spelling "VESPERÆ", the dominant form in this source,
  letting a whole day's trailing prose leak into the captured [praef]
  field on the task brief's own worked example day (19 September).

A distinct second stop-marker bug: the malformed trailing entry this
source shares structurally with the LMS PDFs (a stray, mislabelled
duplicate of 1 January) was initially over-matched by a generic
"first token is 4 digits" heuristic, which false-positived on an
indulgence-decree date citation wrapped mid-sentence in October
("...20 augusti / 1885, 26 augusti 1886..."), truncating the extraction
to 308 of 400 real days. Fixed by anchoring on the tail entry's own
distinctive "1st Jan" opening instead.

Five opposite-prediction Creed probes are re-verified by the tool
itself against its own extracted rows (a failed probe is a hard exit,
not a printed claim) before the fixture is written.

test/test_fiuv_ordo.ml compares the Creed against colitur across all
399 comparable days (Holy Saturday excluded, no Mass that day) --
CLEAN, zero unexplained divergences, a genuine second confirmation of
{!Rite_ef.Rubrics_ef.creed} independent of the LMS lineage. [praef],
[te_deum] and [class_] (including the FIUV ordo's own "III cl." vs
"III cl. (Priv.)" Cum Sanctissima convention, stated on its title
page) are captured into the fixture but deliberately not compared --
colitur has no Gloria/preface predicate yet, and its default
configuration models no Cum Sanctissima overlay to compare the class
convention against.

All 634 tests green (dune test), 635 with the exhaustive sweep and
make check. No lib/ file touched.

Claude-Session: https://claude.ai/code/session_017ZBxCCRM2ojnBupp3SBxV9

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