temporal(ef): the votive Office of the BVM on Saturday, RG 91 entry 27

RG 91 entry 27, "Officium sanctae Mariae in sabbato", sits in the Table
of Precedence between entry 26 (III-class vigils) and entry 28 (IV-class
ferias). Precedence_ef.band already routed a plain IV-class Saturday
feria to entry 27's own band value, but nothing in Temporal_ef.temporal
ever constructed the office itself, so an otherwise-unoccupied Saturday
still surfaced with a bare ferial slug and its season's ordinary colour.

Established from Caput IX of the Rubricae Generales, both photographic
scans and the electronic transcription, word for word (no
scan-vs-transcription conflict: RG 78/79 are General Rubrics prose, not
the Mass-propers body text the transcription is documented elsewhere as
missing almost all of):

  "78. In sabbatis, in quibus occurrit Officium de feria IV classis, fit
  de sancta Maria in sabbato.
  79. Officium sanctae Mariae in sabbato incipit a Matutino et explicit
  post Nonam."

RG 78's own protasis IS "otherwise unoccupied IV-class Saturday" --
every Saturday whose temporal candidate would otherwise be Class4,
across every season that rank reaches (Christmastide, Septuagesima,
Time after Epiphany, Time after Pentecost, ordinary Paschaltide).
Nothing else was needed to decide "otherwise unoccupied": band's own
entry-27 branch already reads rank/weekday on the temporal candidate
unconditionally and only wins the day when nothing outranks it -- RG
78's own condition, decided by the existing occurrence machinery.

Colour is white, unconditionally, per RG 120(b) ("Adhibetur color albus
in Officio et Missa de festis: ... b) B. Mariae Virg."), not RG 119/127/
128's seasonal rules -- this office is never "de Tempore" for colour
purposes, so it overrides the season's own violet/green.

The slug is deliberately left UNCHANGED (reused from whatever the
generic <season>-<week>-<weekday> ferial fallback would already have
produced), for two independent reasons: it matches the Sacred Triduum's
own precedent (identified structurally, off rank/weekday, never off the
slug), and a bespoke uniform slug would have broken
Colitur_kernel.Validate's own slug-uniqueness-per-liturgical-year
invariant, sighted zero times before this task -- confirmed directly by
writing it that way first and watching the landmark-years test fail.

Subject is tagged Bvm (currently inert for precedence -- only Lord is
ever read by band/disposition/admit) and the name is the Latin
"Officium sanctae Mariae in sabbato" (RG 91 entry 27's own table title
and RG 79's own heading), deliberately not English, the same
zero-circularity discipline Holy Family/Holy Name/the Sacred Triduum
already established.

The I-V numbered "Missae de sancta Maria in sabbato" (both scans) are a
Mass-propers selection detail (RG 309(a): "iuxta temporum diversitatem")
governing which readings/texts are said, not which office is kept --
colitur computes no citations yet (Plan 4), so this is deliberately not
modelled here.

Two pre-existing tests needed correction, not because they were wrong
before, but because RG 78 genuinely changes their dates' own facts: a
Saturday inside the Holy Name of Jesus window (3 January) and two
Saturdays inside christmastide_feria_slug's own "-0-"/"-2-" stretches
(26 December, 10 January) are all otherwise-unoccupied Class4 Saturdays,
so they now legitimately carry the BVM office instead of staying a bare
Temporal-subject feria.

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