test(differential): C20 and C38 closed -- agreement 98.4%

lectio carries the readings of the nine Common-routed saints and of three more
that had proper Masses but no reading at all. Every day of 2005-2050 now
resolves a reading there; four days used to come back empty.

C38's own note said it could not close without lectio gaining a Commons
concept. The readings arrived instead of the abstraction, which was enough:
each Common resolves to one first/gospel pair for the saint that names it, so
a table plus assignment layer would have bought indirection and nothing else.

  C20  14 -> 0
  C38  70 -> 0

7 classes -> 5, 351 rows -> 267, agreement 97.9% -> 98.4%.

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