kernel(precedence): three RG-verified EF precedence bugs, found via oracle

Task 16's missalemeum oracle comparison (2026-2027) surfaced three
distinct precedence-engine bugs, each confirmed against the primary
1962 Missale Romanum text and cross-checked against the oracle:

1. RG 33 (vigil omission) was transcribed backwards. The primary text
   reads "Vigilia II AUT III classis penitus omittitur" (a II OR III
   class vigil is entirely omitted on any Sunday or I-class feast) --
   not "I aut II" as the register and this module's own rank check
   (Class1 || Class2) previously had it. I-class vigils (Nativity,
   Pentecost) can never actually lose in this engine (band always
   ranks them above anything that could coincide with their dates), so
   the Class1 half was dead code; the real bug was that Class3 (St
   Lawrence's vigil, the sole III-class vigil) was MISSING, so it fell
   through to an ordinary commemoration instead of RG 33's mandatory
   omission whenever 9 August landed on a Sunday.

2. RG 93/95/109/113 read together: an ordinary, non-privileged
   TEMPORAL-cycle office (a bog-standard green-season feria, a plain
   Advent/Lent Ember day, a Minor Rogation day) has no standing to be
   commemorated at all when impeded -- RG 109's six-item list is a
   CLOSED set of the only temporal circumstances that generate a
   commemoration, not a floor under which anything ordinary still
   gets one. The engine previously commemorated the losing feria
   itself in this situation; confirmed wrong against ~190 independent
   missalemeum days (2026-2027) showing zero commemorations for the
   exact shape. Vigils are explicitly excluded from this new rule --
   RG 31/32 give them their own "if impeded, commemorated" mandate,
   independent of RG 109's list.

3. RG 111(b)'s Sunday admission slot is restricted to "de festo II
   classis" -- a rank restriction, not merely the best available
   ordinary candidate. A III/IV-class ordinary saint competing for a
   II-class Sunday's single commemoration slot had no such restriction
   applied before; confirmed wrong via St Hyginus (11 Jan, Class3)
   losing to Holy Family, which missalemeum shows entirely displaced,
   never commemorated.

All three fixes are pure disposition/admission changes -- they never
touch band, so the observed day (season/slug/rank/colour) is
unaffected in every case; the lectio differential (which never
compares commemorations) stays green untouched. test_precedence_ef.ml
updated throughout: two previously-wrong test expectations corrected
(the RG33 III-class-vigil boundary row, the IV-class-feria totality
row), three privilege boundary rows sharpened from "commemorated but
unprivileged" to "omitted entirely" now that temporal+ordinary
means omission, and a new contrast row added to keep the SANCTORAL
side of rule 2 covered separately from the TEMPORAL side.

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