cli: emit "-" for an absent week, keeping output column-safe

week is "" for roughly 30 days a year (any day outside a numbered
week). Printed as-is among seven space-separated fields, that collapses
two fields into a double space, so naive field-position parsing (e.g.
awk '{print $4}') silently reads the wrong column on those days -- a
real defect for a project whose stated design is Unix-composable CLIs.
Emit "-" instead, so every line always has exactly seven
single-space-separated fields.

Record.headers/to_row exist for exactly this kind of column-safe
encoding but use a different column set and order than this CLI's
documented date/weekday/season/week/slug/rank/colour format (design
spec §6); adopting them here would be a larger, unrequested format
change, so this keeps the CLI's own field list and only substitutes
the empty value.

The cram test's pinned lines are re-verified against liturgical
anchors before promoting, not blind-promoted: 1 Jan 2026 (Circumcision,
class-1, white) and 2-3 Jan (ordinary class-4 Christmastide ferias,
the finding-1 slug fix already re-pinned separately) are correct;
2026-04-05 remains the sole Easter Sunday line, Paschaltide week 1,
class-1, white, matching the independently-computed Easter anchors
printed by `colitur easter 2026` immediately above in the same file.

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