feat(ef): the Major Litanies -- entity, RG80 transfer, RG109(f) privilege

RG 80 (Caput X, "De Litaniis maioribus et minoribus", A): the Major
Litanies are assigned to 25 April, transferred to the following Tuesday
(always Easter+2) when that date is Easter Sunday or Easter Monday. RG 81,
same division: nothing is done in the Office, only in the Mass. RG 109(f)
(Caput XVI): a privileged commemoration.

Entity: Commemoration_only, Fixed(4,25), via data/ef/adjustments.sexp's
`Add major-litanies` -- RG 81 denies it Office standing entirely, which is
exactly what Commemoration_only already means to Precedence.resolve (held
out of the observed contest by construction). Rank Class4 deliberately,
not Class1, to keep the new RG109(f) privilege branch live rather than
shadowed by privilege_of's existing "of a I-class day" branch. Colour
Violet by consistency with the sibling Minor Litanies; subject Saint, the
same "no special exclusion" default this codebase's other
Commemoration_only entries use. Names not primary-sourced, flagged as such
in the data file's own comment.

Transfer: reuses the existing RG 96 placement machinery
(Precedence.disposition's Transfer constructor + Calendar's
place_transfers/resolve_with_injected) rather than a new candidate
channel -- RG 80's own transfer is structurally the same operation RG 96
already performs for an impeded I-class feast. disposition gains a branch,
checked before the Commemoration_only catch-all: the Litanies losing to
winner slug "ef-easter-sunday" or "ef-easter-1-monday" is Transfer, not
Commemorate. transfer_target gains a branch, checked before the general
RG 96 search is even computed, returning Easter+2 directly with no search
at all -- necessary, not merely simpler, since Easter+2 is itself I-class
and a search from there would walk past the exact day RG 80 names (a
commemoration needs no unoccupied day the way a displaced feast does).

Privilege: privilege_of's previously-dead RG 109(f) branch now recognises
the Litanies' own slug. No other code change -- admit's existing
Class1/Class2-Sunday branches already implement "a privileged
commemoration categorically takes the slot" correctly, from an earlier
task.

Full blast-radius measurement, adjudication of the resulting missalemeum
divergence, and the mutation proofs are in the task's own report,
.superpowers/sdd/2026-08-12-colitur-rg16a/major-litanies-report.md.

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