test(ef): golden pins for RG16(a), both directions

Two real dates, hand-verified against the rubric before pinning
(test_golden.ml's own discipline): 2028-08-06, the Transfiguration
suppressing an ordinary Sunday's commemoration entirely (with an
unrelated III-class saint the same fixed date, Pope Sixtus II et al.,
still getting its own ordinary commemoration -- proof the rule targets
the Sunday specifically, not every commemoration due that day); and
2025-02-02, the corrected Purification -- the Sunday observed, the
Purification surviving as an ordinary commemoration, the exact opposite
of what RG16(a) would have done to it before the data fix.

Re-ran the exhaustive sweep (COLITUR_EXHAUSTIVE_SWEEP=1 dune test
--force): 1583-9999, 0 failures, including the resolution invariants
that now see RG16(a)'s changed commemoration accounting.

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