test: golden pins for the known-tricky years

Validation layer 5: fourteen hand-verified pins in test/test_golden.ml,
wired into the suite via test/test_colitur.ml. Each pinned day was computed
and checked against its RG citation before being written down, never
transcribed from `colitur day` output:

- Easter extremes 1598 (earliest, 22 Mar), 1666 (latest, 25 Apr) and 2038
  (late-modern instance of the same latest date) -- all three independently
  computed by hand via the Gauss/Meeus Gregorian Easter algorithm, not read
  off Computus.gregorian_easter. extreme_years in test_validate.ml already
  established 1598/1666 as the true 1583-2500 extremes (correcting a stale
  1818/2038 comment); this file pins the resolved DAY there, not just the
  date.
- Annunciation transfer, 25 March inside Holy Week (2016: 25 March is
  literally Good Friday) and the double transfer with St Joseph (2008:
  RG96's Attamen(a) claims Easter+8 for the Annunciation first, Joseph's
  own RG96 walk continues past it to the next day).
- The RG96 Attamen(a) exception's own CONDITION pinned on both sides: 2057,
  2007, 2012 (general walk suffices, lands before Easter, no exception) vs
  2016/2024 (walk would cross Easter, Easter+8 fires).
- 2011-07-04, the Precious Blood transfer (Sacred Heart outranks it
  outright on 1 July; the RG96 walk skips Visitation and a Sunday before
  landing on 4 July).
- All Souls falling on a Sunday (2025, RG96 Attamen(b)) and Christmas
  falling on a Sunday (2022, RG91 entry 1 -- no contest, since 25 December
  is never an ordinary Sunday candidate in the EF temporal cycle).
- Holy Thursday's white amid violet Passiontide (2026, RG128(b)/RG122) --
  the case colitur and lectio previously agreed was violet, so the
  differential could never have caught it; only a golden pin or the
  missalemeum oracle can.
- Advent/Lent Ember ferias commemorated when impeded (1900, 1902, RG24 +
  RG109(e)) contrasted with IV-class ferias never commemorated (2026,
  RG26) and RG111(b)'s Sunday rank floor (2009, 2026) -- all three assert
  the actual displaced/excluded candidate is present in `omitted`, not just
  that `commemorations` is empty, so a day with no losing candidate at all
  could not pass vacuously.

2038 is deliberately NOT pinned day-by-day: register item F4 confirms
2038-03-06/08/09 are wrong (a lectio bootstrap-generator defect, not
fixable here). Only the Easter-week days, untouched by that bug, are
pinned; the exclusion is stated in the test's own comment, not silent.

Every weekday asserted was independently cross-checked against `date -d
<iso> +%A` (glibc, wholly outside this codebase) before being written down.
Precedence outcomes were traced against precedence_ef.ml's own band/
disposition/admit/transfer_target, not merely observed to look plausible;
where the primary text alone doesn't fully settle an outcome (the 2008
Annunciation/Joseph tie-break, both landing at RG91 table entry 11), the
test's own comment says so rather than overclaiming a citation.

Perturbation-tested: temporarily broke Holy Thursday's white-colour special
case in temporal_ef.ml, confirmed the golden test failed with a clear
day-and-field diff, reverted.

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