Regression from the partial-order board: _job_presences emitted a card
for any area containing a `ready` step. These recipes seed ALL downstream
steps to `ready` at job creation, so a job showed in every future stage
at once (e.g. WO-30061 across racking/receiving/plating/inspection) even
though no parts had advanced there.
Fix: a stage shows ONLY where parts physically are (qty_at_step > 0,
which includes the first-active seed) OR where a step is in_progress/
paused. A merely ready/pending future step with no parts no longer shows.
Strict sequential progress falls out for free — the qty_at_step seed sits
on the lowest-sequence non-terminal step and advances as each completes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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