test(of): pin the six corrupt Year II Gospels in Ordinary Time

Built the litcal readings comparison the OF provenance notes had left as
future work, and it found a defect class the existing layers structurally
could not see: the litcal layer compares season, grade and identity, and
stops there, so every reading colitur serves has been validated by nothing
except the lineage it arrived on.

Ten references are corrupt. Nine end at verse 22 where the OLM ends them at
20; the tenth reads "Matthew 17:9a,10-135", a verse Matthew 17 does not have.
Every one lives in a Year II entry or in of-advent-2-saturday, which has no
year cycle -- not one Year I entry is affected, which is what makes this a
transcription fault rather than ten independent slips.

This commit adds only the detection, and only for the six the invariant can
reach. In Ordinary Time the OF weekday Gospel does not depend on the year of
the cycle: OLM n. 69 point 4 alternates the FIRST reading and leaves the
Gospel a single one-year series. So of-ordinary-time-<n>-<day>-i and its -ii
twin must carry the same Gospel string, and six pairs do not.

Scoped to Ordinary Time deliberately. The unscoped sweep reports 17 further
disagreeing pairs in of-advent-3/4-* and of-christmas-*, all of them correct:
those weekdays are keyed to the calendar DATE (OLM n. 69 point 3), so their
-i/-ii entries describe two different dates rather than two years of one
cycle. An unscoped test would report seventeen false positives and would,
rightly, be switched off by whoever read it next.

Pinned rather than green, because the fix is not ours to make here:
data/of/lectionary.sexp's own header forbids hand-editing a generated
artifact, and lectio's internal/caldata/of-lectionary.ini carries all ten
verbatim. The exact six are listed, so the test fails if a seventh appears
and equally if one is fixed without updating the list -- both are changes a
reader must see.

Mutation-tested in both directions: introducing a seventh violation reddens
it, and correcting Mark 1:14-22 reddens it too.

Evidence for the corrections, in docs/research/of/olm-1981-ocr.txt, the Latin
OLM itself rather than a witness: "Mc 1, 14-20", "Mc 4, 1-20", "Mc 5, 1-20",
"Mt 7, 15-20", "Mt 17, 14-20", "Mt 18, 15-20", "1 Sam 1, 9-20",
"1 Sam 3, 1-10. 19-20", "Mt 17, 10-13". litcal independently confirms three of
the six Gospels and all four references the invariant cannot reach. James
5:13-22 is unlocatable in the OCR but impossible on its face: James ends at
5:20.

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