test(oracle): green -- widen five entries, add M18 for observed identity

layer_m_reason's own five entries whose diff shape was checked by
EXACT list equality (M1, M2, M3, M13, M16) lost their match once the
observed-identity axis widened every row's diff set two commits ago.
Each is widened the same way commemoration-identity was already
widened for M13 once before: the axis now ALSO fires alongside their
existing citation, same root cause, same id -- M1/M3 (temporal-origin
observed day, no name), M2 (same, plus five Paschaltide dates that
used to match cleanly and now surface for the first time), M13
(Joseph, sanctoral, now a genuine title MISMATCH, not merely
unresolved), M16 (the temporal Passiontide feria observed there).

M18 covers the remainder: 373 of 730 days whose observed celebration
is temporal-origin and so carries no English name at all -- the
overwhelming majority of the window, including Holy Family's own two
dates in it (2026-01-11, 2027-01-10), counted here rather than shown
as a false Matched. Gated on the diff SHAPE alone (this file's own
convention for a population this size, the same reasoning M2's own
title-substring predicate already uses instead of a date list),
verdict unresolvable -- the same fourth verdict M15 already
established for the identical limit on the commemoration axis.
Building an English name onto the temporal cycle is Plan 4's own
scope, register §6.

Teeth, per the brief: temporarily corrupted hilary's own English
name in data/ef/sanctoral.sexp (14 January 2026, an OBSERVED sanctoral
day, rank and colour left untouched) and reran. Reddened immediately:

  2026-01-14: observed-identity-mismatch differ -- colitur=(rank=3
  colour=w ...) oracle=(rank=3 colours=[w] title="St. Hilary" ...)

rank and colour agree on both sides -- exactly the shape the
pre-strengthening comparator would have slept through completely.
Reverted (git diff on the data file is empty) before this commit.

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