fix(rite-ef,kernel): follow the oracle on the Purification; admit reads the day's own Sunday-ness, not observed

Fix round 1 review, two findings landed together because each golden pin's
correctness depends on both.

CRITICAL (item 1): reverts this branch's own first-pass retag of the
Purification (2 February) from Lord back to Bvm -> Lord. The calendarium
titles it 'B. Mariae Virg.', but missalemeum -- this project's designated
EF oracle -- treats it as taking an occurring II-class Sunday's place
outright, commemorations empty, exactly RG16(a)'s own festum Domini
treatment (2020-02-02, 2014-02-02, independently fetched). Control,
2019-09-08 (the Nativity of the BVM, an ordinary Marian feast, on a
Sunday): the Sunday observed, the feast merely commemorated -- the
opposite pattern, proving the Purification's own oracle treatment is
deliberate, not a gap. RG16(a) alone, on the untouched data, would have
matched the oracle character for character; retagging Bvm is what moved
colitur away from it on 1200 domain-wide days. The user has ruled: follow
the oracle. Genuine primary-text counter-evidence (RG120(b), the colour
rule grouping 2 February under 'B. Mariae Virg.', a category separate
from 'Domini') is recorded in the register, not discarded -- a different
project could reasonably rule the other way on the same evidence.
most-holy-name-of-mary stays retagged Bvm; that one was never disputed.
Removes the now-unneeded C12 lectio allow-list entry (data/ef/
expected-divergences.sexp, test_differential.ml): with the Purification
Lord again, colitur matches lectio's own class = lord on every affected
date, no divergence to allow-list.

IMPORTANT (item 2): Precedence.rules.admit gains a ~temporal parameter --
a genuine kernel signature change, unlike RG16(a) itself. RG111(b)'s own
Sunday rank floor ('one commemoration, namely of a II-class feast') used
to be detected by reading observed's own slug for a Sunday marker, which
silently assumed observed IS the day's temporal-cycle office. RG16(a)
breaks that assumption on purpose: a Feast of the Lord standing in for an
impeded Sunday 'cum omnibus iuribus et privilegiis' keeps the day a
dominica II classis for RG111(b) too, even though the FEAST, not the
Sunday, is observed. Before this fix an unrelated saint (Pope Sixtus II
et al., 6 August, Class3) was wrongly admitted into the freed slot on
every one of 1178 domain-wide days. Oracle-confirmed directly: 2023-08-06
(a Sunday) shows him displaced, commemorations empty; 2026-08-06 (an
ordinary Thursday) shows him admitted -- being a Sunday is exactly what
excludes him. admit now reads Sunday-ness off ~temporal (the day's own
temporal-cycle candidate, passed through from Precedence.resolve
unchanged) instead of observed. Validate's own admission fixed-point
invariant updated to pass the same real temporal candidate through.

Both golden pins in test_golden.ml were promoted from actual colitur day
output without independently consulting the rubric or the oracle first --
a real defect the review caught. Re-derived from both before re-pinning:
2028-08-06 and 2025-02-02 now pin comms=[], no commemoration at all,
matching missalemeum exactly in both cases.

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