fix(ef): the ferias between Epiphany and the Sunday after it

They repeat Epiphany's own Mass, Isa 60:1-6 / Matt 2:1-12. lectio gave them
the Mass of the first Sunday AFTER Epiphany (Rom 12:1-5 / Luke 2:42-52), which
belongs to the ferias that follow that Sunday, not to the ones before it.

The two groups cannot be told apart by slug: both are
ef-time-after-epiphany-1-<weekday>, because the week numbering starts at the
Sunday and the days before it fall in the same numbered week. So the split is
made on the date, against the same anchor efWeek uses.

Saturdays need no exclusion here -- an unoccupied Saturday in the window
carries Our Lady's office and her Mass, and that check runs first. colitur
reaches the same result by listing only the five non-Saturday weekdays.

7, 9 and 12 January 2026 now all match colitur, the 12th being the boundary
case: it follows the Sunday of the 11th and correctly keeps Rom 12:1-5.

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