feat(of): admit and vigil_feast, both argued degenerate

admit returns the empty list because disposition never returns Commemorate;
vigil_feast returns None because the OF has no vigil office that its feast's
movement could orphan -- 'of-nativity-vigil' is a Mass formulary of the
solemnity, not a separate celebration.

Both are argued from the sources rather than stubbed, and Precedence_of.rules
now assembles the four functions the kernel resolver consumes.

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