docs(ef): fix round 2 -- three miscitations and a recorded blind spot

Comment and citation corrections found by review, plus one finding that
survived an attempt to reconstruct it. No behaviour change; the suite is
unchanged at 358 green.

The ferial rubric "Diebus ferialibus a 2 ad 5 ianuarii Missa dicitur ut
die 1 ianuarii" was attributed to RG 17(a) in three test comments. It is
not RG 17(a). RG 17(a) (LT.txt:843) fixes only WHEN the Holy Name is
kept -- "celebrandum dominica quae occurrit a die 2 ad 5 ianuarii; secus
die 2 ianuarii". The rubric quoted is a Mass-propers rubric printed
under the Sanctissimi Nominis Iesu heading (scan1:6523-6526, corroborated
scan2:7216), governing what the ordinary ferias of that window say when
they are not the feast at all. Two rules sharing a date window. Fix
round 1 had already corrected this on the data side; the generator's own
comment was right throughout. Only the test comments were stale.

test_differential.ml named bootstrap_lectionary.ml's derived_entries as
the source of ef-holy-name's citations. That binding no longer exists --
it was the mechanism that derived them from ef-holy-name-sunday's
wrongly-widened ini translation, removed in Task 9 because the
derivation was itself the error. They are hand-authored from the scans
now, as holy_name_entries.

M26's shape 1 described its 21 rows as votive Masses of the BVM "on an
otherwise-unoccupied feria, not only a Saturday", splitting them into 4
BVM-Saturday rows and 17 "ordinary weekday ferias". Every one of the 21
is a Saturday, each checked individually against date -d. The error was
not merely verbal: it made the gap look broader than a single cause and
pointed away from the one rule that explains all 21. The sub-groups
differ by season, not weekday, and only in what colitur shows in the
votive Mass's place. One gap -- the office is built (RG 91 entry 27),
the seasonal selection among the five Masses is not.

Recorded, not fixed: step 4 of the reading chain has no oracle witness
at all. This began as a note to write up a live-oracle confirmation for
Felicitas and Perpetua; the reconstruction contradicted its premise. The
sweep ran over 2028, where 6 March resolves as a Lenten feria with the
saint admitted only as a commemoration, so her own Mass is never read
that year. The finding underneath is firmer: only five saints route
through a Common, they are the observed office on five days in all of
2005-2050 (isidore-of-seville 2008/2035/2046, frances-rome and
sts-felicitas-perpetua both 2038), two are never observed in 46 years,
and none falls in layer 4's window. Layer 3 does not cover it either --
lectio resolves the literal "-"/"-" sentinel there, which is what C18 is
gated on, so it confirms only that colitur emits a citation where lectio
emits none, never that it is right. Closing it needs the oracle fixture
extended to 2035, 2038 or 2046; that is a fixture-scope decision.

Register: sections 6.6 and 6.7. CLAUDE.md's layer-blindness list gains
the step-4 entry.

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