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Design for parts fanning across shop-floor stages (e.g. 10 at Masking, 20 at Plating, 20 at Baking on one 50-part job): - Tracking model C — fluid per-stage quantities via existing qty_at_step; failed/held/rework subsets ride existing hold/scrap/rework records. - Board Option 2 — a card per stage-presence (composite job:area keys); unsplit jobs render identically to today. - Easy-advance operator flow — one "Send to next" action, steppers / rack-tap (no keyboard), intent-named Hold/Scrap/Rework buttons. - Light-up plumbing — auto-ready on arrival, qty-aware predecessor gate, auto-finish source on drain; no auto-start (labour accuracy). - Close — wait to reconverge; close/cert/ship/invoice lifecycle unchanged. Additive only: no new core model, no data migration, no change to the quantity model, OWL component tree, or close lifecycle. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>