temporal(ef): the Holy Family, first Sunday after Epiphany (RG 17(b))

RG 17(b), verified against both photographic scans (missale-romanum-
1962.pdf and "Missale Romanum 1962_text.pdf" -- the electronic
transcription carries the same paragraph, so this one is not itself
a transcription-vs-scan divergence): the Holy Family of Jesus, Mary
and Joseph is celebrated on the first Sunday after Epiphany, II
class, EVERY year, taking the Sunday's own place "cum omnibus
iuribus et privilegiis" -- the same formula RG 16(a) already uses.

The slug, rank and colour temporal_ef.ml already computed for that
Sunday (ef-time-after-epiphany-sunday-1, Class2, white) turn out to
be exactly right by coincidence -- an ordinary, unnamed Sunday and
Holy Family share both. The only field that was silently wrong is
subject: always Temporal before this, when RG 91 entry 14 ("Festa
Domini II classis, primum mobilia, deinde fixa") calls Holy Family a
movable Feast of the Lord. temporal's build now takes an optional
~subject, applied only on Holy Family's own date -- every other
Sunday, including the still-unbuilt Holy Name of Jesus (RG 17(a)),
is unaffected.

RG 17(b)'s window (7-13 January) can never be empty of a Sunday --
sunday_on_or_before(6 Jan) + 7 always lands in [7, 13] regardless of
6 January's weekday -- unlike RG 17(a)'s Holy Name (2-5 January, CAN
be empty), whose calendarium entry carries an explicit "vel ea
deficiente, die 2 ianuarii" fallback right next to Holy Family's own,
fallback-free one. No fallback needed or built.

Added to anchors (holy_family_sunday is independently computed, not
routed through named -- see temporal_ef.ml's own comment on why) and
to its own dedicated anchor/erosion test in test_temporal_ef.ml,
kept separate from the generic named-days coverage test since this
genuinely isn't one of named's own outputs.

Does not yet touch precedence: band still has no notion of a movable
Class2 Lord feast (entry 14 gates on sanctoral origin only), so on
the seven years 13 January is itself Holy Family's date (2008, 2013,
2019, 2030, 2036, 2041, 2047), the fixed Commemoration of the Baptism
of the Lord still wins the day exactly as before this commit -- the
next commit fixes the ordering RG 91 entry 14's own text states
("primum mobilia, deinde fixa").

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