rite(ef): RG 91 Table of Precedence

Precedence_ef.band transcribes RG 91's 28-entry Table of Precedence
(rules-register.md §4) for the EF rite: given a day's context and a
candidate celebration, returns the table's own entry number, 1-28
(I class 1-13, II class 14-21, III class 22-26, IV class 27-28); lower
wins. Every branch carries its entry number and register citation in a
comment, checked in the table's own numeric order.

Two entries are transcribed as the register states them even though
they invert the pattern the rest of the table follows: at III class,
23 (particular calendars) outranks 24 (universal), the reverse of how
11/12 and 14/16/19/20 rank a universal feast ahead of a proper one at
I and II class.

Sanctoral-origin, layer-decided entries (11-13, 14/16/19/20, 23/24)
follow the brief's structural insight: a celebration whose layer is
not the universal base is an overlay -- proper, or indult if its
layer id also carries the indult prefix. Neither the universal-layer
id nor the indult prefix is an RG citation; both are colitur's own
data-modelling convention, exposed from the module so whichever task
loads the real EF sanctoral overlays can align to them.

Vigils (21, 26) are read off the temporal cycle's own -vigil slug
suffix rather than gated on origin, since a II/III-class vigil can be
either temporal-origin (Ascension, already produced by temporal_ef) or
sanctoral-origin (a saint's vigil, no task has loaded yet); Ember days
(part of entry 18) are read off temporal_ef's own ember slug prefixes
rather than re-derived, since the September anchor is independently
flagged there as one of the more contested dates in the calendar.

A candidate shape the table has no row for (e.g. a Class1 vigil that
is not Nativity or Pentecost, or a Class4 candidate marked as a vigil
-- RG 91 has no IV-class vigil either) returns a dedicated unclassified
sentinel (max_int) rather than being folded into a same-rank entry it
does not belong to.

test_precedence_ef.ml is table-driven: one Alcotest.test_case per RG
91 entry (55 rows total, several entries covered by more than one
named day so a single missed offset cannot hide behind a passing
sibling), each date computed from Computus.gregorian_easter rather
than hand-typed, so an arithmetic slip cannot pass by accident.

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