feat(cli): colitur readings, one line per day

The lectionary has been resolvable since Task 4 but invisible from the
command line: `colitur day` prints no citations, so the branch's whole
deliverable could only be seen through the test suite.

A separate command rather than extra columns on `day`, which is where the
plan pointed. Its instruction was to append the Epistle and Gospel to
each row "matching the existing column style", and that turns out not to
be possible: a citation contains spaces and commas ("Ezech 34:11-16",
"Ecclus 51:1-8, 12") while a day row is space-separated with a
variable-length +slug commemoration tail, so appending them leaves the
row unsplittable -- no awk or cut field number recovers where the Epistle
ends. That is the opposite of what the row is shaped for.

So `day` keeps its format byte-identical, asserted directly in cli.t
rather than left implicit, and the citations get their own row with
" | "-delimited fields, safe for values containing spaces. Both formats
are a stopgap and say so in the source: the design calls for one schema
rendered through a logic-less template engine, and two ad-hoc formats are
easier to retire later than one overloaded format whose parsing rules
nobody wrote down.

The year walk is now shared. day_report and readings_report differ only
in how a day is printed, and the two-liturgical-year indexing -- with its
own reasoning about civil-versus-liturgical spans -- is exactly the part
that must not be duplicated and drift.

"-" for an absent part, though no EF day can currently print one: layer 2
asserts exactly one First and one Gospel on every day of every year
1583-9999. The CLI still does not assume a guarantee the kernel makes
about data rather than about types.

cli.t gains the four chain-step cases test_golden.ml pins against the
scans, so the CLI path is checked to agree with the library path, plus
the 2 January line, which reads the Circumcision's Mass under the
Missal's own ferial rubric (scan1:6523-6526) and not RG 17(a). Verified
the cram tests actually run and have teeth: corrupting one expectation
produces a diff and exits 1.

CLAUDE.md: state, test count (369, 370 with the sweep), the readings
command and why it is separate, and What's next -- the lectionary landed
early rather than inside Plan 4, so what remains there is OF's own
lectionary, not the mechanism. Chants stay deliberately unbuilt, and
Validate now rejects any part outside First/Gospel.

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