kernel(rite-ef): apply RG16(a) -- a Feast of the Lord leaves the impeded Sunday uncommemorated

Caput III "De Dominicis", RG 16(a): a Feast of the Lord, I or II class,
occurring on a II-class Sunday takes the Sunday's own place with all its
rights and privileges -- of the Sunday, therefore, no commemoration is
made. band's entry 14 already ranked such a feast above the Sunday
correctly; disposition had no exception for the collision, so the impeded
Sunday fell through to the ordinary RG 95/109(a) commemorate-or-omit
catch-all and was wrongly admitted as a privileged commemoration.

Adds a branch to Rite_ef.Precedence_ef.disposition, gated on all four of:
loser is temporal-origin, loser rank Class2, loser carries the Sunday slug
marker, winner rank Class1-or-2 with subject Lord. No signature change --
disposition already receives the winner (RG 33's own vigil-omission branch
already reads it); each conjunct is proved independently load-bearing by
a dedicated disposition_cases row, including one real-data case each for
the winner's subject and rank conjuncts, and a defensive synthetic case
for the winner rank conjunct's currently-unreachable Class3 shape. A new
end-to-end resolve-level test (2028-08-06, the Transfiguration) proves the
real band/disposition pipeline together, checking the Omit reason string
distinguishes this from admit's own admission-limit cut.

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