fix(cli): render the Second reading on colitur readings

The OF lectionary (data/of/lectionary.sexp) carries 183 Second readings,
146 of them on Sunday keys, and the kernel resolves them correctly -- but
readings_line (EF) and readings_line_of (OF) in bin/main.ml only ever
printed Citation.First and Citation.Gospel, so `colitur readings --rite of`
silently dropped every Second reading it computed.

Both functions gain a second_suffix lookup, spliced between the existing
First and Gospel fields, present only when the day carries a Second
citation. No rite check: EF's citation_shapes is [[First; Gospel]] alone,
so EF rows are unaffected by construction, not by special-casing.

EF byte-identity verified two ways: `git diff --stat v1.0.0..HEAD --
data/ef/` is empty, and `colitur day`/`colitur readings --rite ef` for
2026, 1583 and 9999 cmp identical against a build of the prior commit.

test/cli.t: fixed the one now-stale assertion and added coverage for the
three-citation OF Sunday shape alongside the unchanged two-citation OF
weekday and EF shapes.

0 files changed, 0 insertions, 0 deletions