Relative Plan — Day Numbers, Because No Date Was Stated

A plan with no start date is still a plan: five days, then ten, then three. The engine schedules it, computes the critical path and the float, and draws the axis in DAY NUMBERS — because inventing a Monday would put a fabricated Tuesday under every bar and a fabricated weekend in the middle of one. There is deliberately no `calendar` line either: with no date there is no way to know which day is a Saturday, so declaring a working week here would declare something the engine cannot apply — and it says so if you do. Add `start 2026-03-02` and every bar becomes a date, on the week you then declare, without another edit.