fix(ef): M6 was convicted on the transcription's silence, not a scan

data/ef/expected-divergences-missalemeum.sexp's M6 entry and its matching
comment in test/test_oracle.ml both cited 1962-06-23,_SS_Ioannes_XXIII,
_Missale_Romanum,_LT.pdf's 14 August row ("Vigilia, II classis." --
nothing else) as if it were the calendarium itself. It is an electronic
transcription that silently drops commemoration lines the photographic
scans carry. missale-romanum-1962.pdf's 14 August row reads "Vigilia, II
classis, Commemoratio S. Eusebii Conf.", with its own proper following --
independently confirmed in the second scan, Missale Romanum 1962_text.pdf.

M6's verdict flips colitur -> missalemeum: this is a genuine colitur data
gap, the same shape as M4/M7/M9/M14 (absent from data/ef/sanctoral.sexp and
from lectio's own tridentine-calendar.ini), not a spurious oracle entry.
Not fixed here for the same reason those four are not: it requires
touching lectio's own bootstrap source, out of reach for this task.

expected_rows is unchanged (2) -- the diff shape the allow-list predicate
matches does not depend on which side is judged correct, confirmed by the
suite passing unchanged.

A companion register ruling that convicted romanus (9 August) on the
identical reasoning -- and the register's own sanctoral-audit bucket
counts that followed from it -- are corrected in docs/research/
rules-register.md (gitignored, not part of this commit). Full audit
method, the complete list of dropped commemorations found across the
whole calendarium, and every other ruling checked for the same defect
are in .superpowers/sdd/2026-08-12-colitur-rg16a/transcription-audit-
report.md (also gitignored).

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