Merge branch 'ef-bvm-saturday': the Office of Our Lady on Saturday

Builds RG 91 entry 27 under RG 78 -- 'In sabbatis, in quibus occurrit
Officium de feria IV classis, fit de sancta Maria in sabbato' -- a rank
test, not a season list. band had been assigning entry 27 312966 times
across the domain while the office was never constructed, so an
otherwise-unoccupied Saturday got a bare ferial slug and its season's
colour.

75863 days change, in two shapes: colour (green or violet to white) on
74642, and colour plus a dropped commemoration on 1221. The 312966
reconciles to the day across four buckets, 210808 of them impeded by a
sanctoral winner.

The first version introduced a live RG 112(d) violation on every
Saturday falling on 16 July: the Office of Our Lady observed,
commemorating Our Lady. Both photographic scans print a rubric at that
Mass for exactly this collision -- 'Missa dici potest aut de sancta
Maria in sabbato, aut propria' -- absent from the electronic
transcription, and cited nowhere. It was missed because the check was a
grep for subject = Bvm, and Mt Carmel is tagged Saint: the rubric's
criterion is whose intercession the oration implores, not colitur's own
tag.

The I-V Mass numbering is a propers rotation and stays unbuilt;
citations remain empty on all 3073916 days.

Recorded rather than glossed: the new rule has no comparison-layer
witness at all, and lectio's fixture prints a Mt Carmel commemoration on
8 in-window dates where colitur now prints none -- a real divergence
that falls through a gap in what the comparators examine. Time after
Epiphany's 5015 office days have zero oracle witnesses and rest on the
scan alone.

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