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a6ea1a48ac
Extends the warehouse hierarchy below zone with ground stacks and vertical slots, so a container's exact position is recorded rather than only its zone. - freight.warehouse_zone_stacks / warehouse_zone_slots, plus nullable stack_id / slot_id on warehouse_inventory (existing rows stay valid) - slot occupancy is derived from inventory status, guarded by a partial unique index, so no exit path has to remember to free a slot - placement service: hierarchy validation, bottom-up stacking rules, accessibility/blocking-container reads, capacity vs slot summaries - stack CRUD with auto-generated slots; reuses warehouse-zone permissions - slot support folded into the existing move()/store() paths - fix: validateLocation now rejects a mismatched warehouse/yard/zone triple - seed:warehouse-layout builds the layout from a JSON config