docs: Holy Family + RG112(a) resolved; layer 4 observed-identity gap closed

CLAUDE.md's own carried-item list (item 1, RG16(a)) named two open
items it did not fix: 13 January mistagged Saint (independently
fixed upstream by ef-rebootstrap, not this task) and RG 112
unimplemented. Both close now, plus a third: the 'know what each
layer cannot see' section did not record that layer 4 (the
missalemeum oracle) compared the observed day's rank and colour and
never its identity -- exactly why the missing Holy Family went
unnoticed by every layer for as long as it did. Recorded as a new,
third RESOLVED item alongside RG16(a) and commemoration identity,
with the same shape: what broke, what was found while fixing it, the
measured blast radius, what stays open.

docs/research/rules-register.md (gitignored, not part of this
commit) carries the full account as its own new §6.2 -- the complete
RG 91 entry 14 and RG 112 primary texts (all four sub-clauses, not
only the two the register quoted before), the Holy Family Mass
propers' own more specific 13-January rubric found while building
this, and the independently cross-verified 1,220-day blast radius.

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