data(ef): bootstrap the 1962 sanctoral from lectio

Convert lectio's tridentine-calendar.ini (322 entries) into
data/ef/sanctoral.sexp via a validating OCaml converter, tools/
bootstrap_sanctoral.ml, rather than a hand-written script: every field is
built through Slug.of_string, Colour.of_string and Vocab_ef.rank_of_string,
so the emitted sexp is valid by construction.

Two conversion decisions, both documented rather than buried:
- subject defaults to Subject.Saint, overriding Celebration.make's kernel
  default of Subject.Temporal, for the 316 entries with no explicit class;
- rank = commemoration maps to status = Commemoration_only with an inferred
  Class3 (not a citation -- it is what the 1960 reform reduced most simple
  feasts from), recorded as an open item in the rules register for the
  oracle to adjudicate.

Every celebration is tagged layer = Precedence_ef.universal_layer, the
provenance id RG 91's band classifier reads to tell the universal calendar
from proper/indult data.

The generated file carries a provenance header: source path, its SHA-256,
and the UTC conversion date, so re-bootstrapping against a newer lectio is
reproducible and diffable. Output is byte-identical across runs.

test/test_sanctoral_ef.ml loads the file through Layer.load and checks the
counts independently derived from the source INI (322 entries, 114
Commemoration_only, 12 Class1, no Subject.Temporal, every date resolves in
a leap year), plus two named spot-checks against the INI's own text -- one
entry with an explicit class field, one commemoration -- so a passing count
cannot hide the wrong 322 entries having been converted.

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