feat(kernel,ef): the lectionary reports which Mass it said

Rite.readings now returns (Mass_formulary.t option * Citation.t list)
instead of a bare citation list, and Liturgical_day.t carries the result
as a new formulary field. Validate holds a rite that resolves a formulary
at all to resolving one on every day, the same discipline it already
applies to citations; the EF lectionary chain resolves Some on every day
of every year 1583-9999, confirmed by a direct sweep over 2005-2050 as
well as through Validate itself.

Plan Tasks 2 and 3 are merged into this one commit on the coordinator's
own instruction: Rite.readings' signature and the field that consumes it
are one atomic edit, and the intermediate state does not compile on its
own.

Each of the four lectionary steps now builds its own Mass_formulary.t at
the point it decides, not by re-deriving it afterwards from the citations
it returns: step 1 tags Proper with the observed slug, step 2 tags
Own_slug with the day's own temporal slug, step 3 tags Preceding_sunday
with the resumed Sunday's temporal slug, and step 4 tags Common with the
Common's own id -- Commons.find now returns that id alongside its
citations rather than discarding it, since it is only ever in scope at
the point the assignment is looked up.

The RG 309(a) Saturday votive Mass of Our Lady, which answers between
steps 4 and 2 rather than as one of the four numbered steps, is tagged
Own_slug too: Mass_formulary.source has no dedicated constructor for it,
and its own guard only ever fires when the observed celebration already
is the day's own (reused ferial) temporal slug, which is exactly what
Own_slug documents. Recorded as a judgement call in the task report, not
a specified answer.

test/cli.t's `emit --format sexp` line count is repinned (8472 to 8881):
that command serializes Liturgical_day.t whole, so the new field grows
its output. `colitur day` itself is untouched -- verified byte-identical
against the pre-change binary across 1583, 1900, 2026, 2038 and 9999.

0 files changed, 0 insertions, 0 deletions