working-exceptions first build

nowline v1

// Titled working exceptions (specs/working-calendar.md §4, §7.4, §10 Example
// D). A titled, dated `working` declaration puts days back into the schedule
// and is labelled in the marker row with the days it adds ("Release crunch ·
// +1d"). The label has no cut line under `hide` and no band under `show`: a
// working day removes no time.
//
// The stressed axis is the working-exception labels:
//   - Release crunch: a working Saturday, Dec 5, one day after the Launch
//     milestone, so the two pack against each other in the marker row.
//   - Crunch weekend: a range over Sat Dec 19 and Sun Dec 20, so `+2d`.
//   - Make-up day: Wed Dec 30 works inside Winter break, which splits the
//     closure into two labelled seams; the make-up label says why.
//   - An untitled working Saturday, Dec 12: the day works, nothing is drawn.

config

non-working winter-break "Winter break" start:2026-12-24 end:2027-01-01

working crunch "Release crunch" date:2026-12-05

working weekend "Crunch weekend" start:2026-12-19 end:2026-12-20

working makeup "Make-up day" date:2026-12-30

working date:2026-12-12

roadmap working-exceptions "Working exceptions" start:2026-11-30 scale:1w calendar:business

milestone launch "Launch" date:2026-12-04
swimlane a "A"
  item build "Build" duration:2w
  item harden "Harden" duration:2w
  item ship "Ship" duration:1w