feat(cli): colitur emit -- csv, json, sexp, xml, ics

Reuses resolved_year_report's existing two-liturgical-year indexing
rather than copying it: that walk owns the civil-vs-liturgical span
reasoning, and a second copy would drift. It is refactored to return the
days, with the printer layered on top, so day and readings behave
identically -- which cli.t proves byte-for-byte.

CSV emits one header for a whole multi-year run, not one per year.

A reversed range is a usage error rather than silently empty output.

Asserted in cli.t: two ics runs are byte-identical, because nothing in
the path reads a clock.

0 files changed, 0 insertions, 0 deletions