docs: CLAUDE.md for the Major Litanies

Records RG80/109(f) as RESOLVED (was "NARROWED, deliberately not built"),
corrects a mis-citation carried in that entry (RG111(b), not RG111(c), is
the clause that makes a privileged Litanies commemoration displace St
Mark's own ordinary one), and narrows the shared "no channel for a
movable, Easter-relative commemoration candidate" blocker to Rogation
Wednesday alone -- the Major Litanies' own version of that blocker
dissolved by reusing the existing RG96 transfer machinery, a route not
available to Rogation Wednesday (nothing there is being transferred FROM
a fixed civil date).

Adds a "know what each layer cannot see" bullet: layer 3 (lectio) is
entirely blind to this whole change; layer 4 (missalemeum) sees the entity
and the RG111(b) question but is blind to the transfer specifically,
confirmed by mutation, since neither year in its 2026-2027 fixture window
is a trigger year.

Updates the stale Plan-3-era test count and the allow-list summary
(expected-divergences-missalemeum.sexp now 12 active entries, M5
corrected, M20 added, M18's count adjusted).

0 files changed, 0 insertions, 0 deletions