test(differential): fix round 1 (F2, F5) -- split 13-Jan-Sunday into C13

13 January retagged subject=Lord (previous commit's regeneration) makes
RG16(a) fire on the 7 years it falls on a Sunday within 2005-2050 (2008,
2013, 2019, 2030, 2036, 2041, 2047): colitur now observes the Baptism of
the Lord itself where it used to observe the generic Sunday slug. The diff
signature against lectio's fixture widens from {season;colour} to
{season;slug;colour} -- but jan_6_13_slug already pre-authorised this exact
slug across the whole 6-13 January window (correctly, for the other 39
non-Sunday years), so layer_c_reason routed the new, wider-shape rows into
C1 unchanged, and C1's own expected_rows (a pure row count) did not move.
A count proving cardinality where identity was required -- on the one day
this branch itself already flags as still wrong under RG 112.

Split into its own entry, C13, matched by an exact 7-date literal list
checked before C1 in the if/elif chain. C1's own expected_rows corrected
368 -> 361 (independently re-derived: a Python script reading
data/ef/sanctoral.sexp's regenerated output and the committed lectio
fixture directly, replicating diff_fields/layer_c_reason's own logic
outside the OCaml comparator -- not transcribed from the failing
comparator's own count).

C13's own citation records a refinement over the coordinator's framing,
checked directly rather than assumed: lectio's committed fixture is a
frozen snapshot that predates lectio's own equivalent fix to this entry's
class field (the same staleness shape as C12). Confirmed by building
lectio's own cmd/lectio-ef-dump from its current source tree (read-only)
and running it fresh for all 7 dates -- lectio's LIVE engine now agrees
with colitur's slug/rank/colour exactly, disagreeing only on season (the
already-understood C1 divergence). This is not evidence colitur's answer
is right against the Missal -- it is not (register's own RG112 item) --
only that this specific divergence from the fixture is a staleness
artifact, not a live disagreement between the two engines' current logic.

Also fixes F5: C12's own note said "5 of the 15 corrected slugs" while
listing and counting 7 -- corrected to 7.

Also corrects the module header's stale "13 January ... slug/rank/colour
already equal lectio's exactly, in all 46 years" claim (true only for the
39 non-Sunday years now).

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