docs: close/narrow the Triduum and Litanies open items in CLAUDE.md

Item 5: the Sacred Triduum's own identity is RESOLVED (RG 91 entry 2),
full 1583-9999 blast radius measured at zero differing CLI lines --
the change is invisible to layers 2-4, visible only to the two golden/
unit tests built for it.

Major Litanies (RG 80) and Rogation Wednesday's own commemoration
(RG 87-89) are established from a photographic scan and fully cited,
but deliberately not built: both need a rite-computed, Easter-relative,
non-competing commemoration candidate -- a kind of thing
Precedence.resolve's architecture has no channel for. Measured, not
assumed: RG 80's own transfer clause triggers in 194 of 8417 domain
years (~2.3%), so building only the ordinary case would trade a known,
understood gap for a new wrong answer in those years.

Renumbers the trailing three architectural-debt items (5-7 -> 6-8) to
make room.

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