test(differential): C17 closed -- the largest divergence class is gone

lectio built the votive Office of Our Lady on Saturday (RG 78) and then said
RG 309(a)'s own Mass for it. Both halves were needed: RG 78 keeps the office
and gives it white, RG 309(a) picks among the Missal's five seasonal
formularies. Fixing only the first leaves the day announcing Our Lady and
reading the feria's Mass -- the bug colitur itself shipped briefly and fixed
in its v0.3.0.

  C17  439 -> 0     CLOSED -- the largest class between the two engines
  C31  103 -> 63    Saturdays that carried both causes; only this one left
  C35   69 -> 60    same
  C1    35 -> 75    GREW

C1 growing is not a regression and is recorded as such in its own note: the
January Saturdays C17 used to absorb now differ only on the slug vocabulary
C1 already covers, so they land there instead. Rows moved between entries as
the larger cause was removed.

Also in this refresh, from the same session: weeks after Epiphany now count
from the first Sunday after it rather than from 6 January, which took C19
from 35 to 7 -- what remains there is the Holy Family interaction, a different
cause needing RG 17(b) in lectio.

19 classes -> 18, 1493 rows -> 1045, agreement 91.1% -> 93.8%.

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