test(differential): C8 closed, C6 narrowed to naming

lectio gained Rogation Monday and Tuesday (RG 87, violet under RG 128(d)) and
the Missal's own Mass for the weekdays within the Octave of the Nativity
("Diebus infra octavam Nativitatis Domini", Titus 3:4-7 / Luke 2:15-20).

  C8   26 -> 0    CLOSED
  C6  119 -> 119  narrowed: the cause halved, the count did not

C6 is worth reading carefully rather than skimming the number. Its rows no
longer differ on First_f or Gospel_f at all -- the two engines now read the
SAME Mass on 29-31 December, where lectio previously served the Sunday's. What
is left is Slug_f alone, colitur's ef-nativity-octave-day-N against lectio's
ef-christmas-N-weekday. That is vocabulary, not disagreement. The count did not
move because the entry's gate already admitted a Slug_f-only subset, which is
exactly the case where a row count is a misleading summary.

17 classes, 1019 rows, agreement 93.9%.

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