test(oracle): close M4, M6, M7, M9 and M14 -- the five now-fixed data gaps

Each was recorded as a genuine data gap "traced upstream into lectio,
unfixable without touching lectio". That constraint is gone: all five
commemorations (St Agnes secundo 28 Jan, St Eusebius Confessor 14 Aug, St
Evaristus 26 Oct, St Theodore 9 Nov, St Boniface Martyr 14 May) are now
present in the re-bootstrapped sanctoral.sexp, and each divergence stops
occurring in the 2026-2027 oracle fixture -- verified by re-running the
comparator and confirming zero rows for all five ids, not assumed from the
data change alone.

Removed rather than kept as dead 0-row citations, matching the M17
precedent already in this file: the count pin
(test_layer_m_counts_match_citations) now enforces that none of these five
divergences can silently reappear. Corresponding dead code (m4_dates
.. m14_dates and their layer_m_reason branches) removed from
test_oracle.ml; a short pointer comment left at each id's old location.

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