feat(ef): the Most Holy Name of Jesus, and the ferias of 2-5 January

RG 17(a): "festum Ss.mi Nominis Iesu, celebrandum dominica quae occurrit a die
2 ad 5 ianuarii, secus die 2 ianuarii." The Most Holy Name is kept on the
Sunday falling 2-5 January and, when no Sunday falls in that window, on 2
January instead. lectio built neither shape, so the day was an ordinary Sunday
within the octave and read Gal 4:1-7.

The FALLBACK matters more than it looks. The window is four days wide, so in
about three years in seven no Sunday lands in it -- in those years there was no
Holy Name office at all, a missing II-class feast rather than a misnamed one.
The test pins both shapes, checks the fallback does NOT also fire in a year
where the Sunday carries the feast, and asserts across 2005-2050 that every
year gets it exactly once by one shape or the other.

Separately, the ferial days of that window get their own Mass. The Missal's
rubric at the feast says it directly: "Diebus ferialibus a 2 ad 5 ianuarii
Missa dicitur ut die 1 ianuarii" -- the Circumcision's Mass, Titus 2:11-15 /
Luke 2:21. They had been falling through to the Sunday within the octave.

Ferial only, and the exclusions are the interesting part: the Sunday carries
the Holy Name and its own Mass, and an unoccupied Saturday carries Our Lady's
office and hers. 3 January 2026 is such a Saturday and correctly reads
Titus 3:4-7, not 2:11-15 -- which works because the BVM check runs first.

All four days of 2-5 January 2026 now match colitur.

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