v1.9.3

v1.9.3 — Aggregate tracking display for fulfillments (#9)

v1.9.0 keyed shipments to source orders, leaving fulfillments rendering as "—" in the Orders list Tracking column and showing an empty Shipment Tracking meta box on their edit pages. Adds a display-side fan-in (get_effective_shipments) that pulls shipments from _fishotel_fulfillment_sources when the fulfillment has none of its own, deduped by tracking number so one badge renders per physical box. Write paths keep using direct lookups so add/remove/recheck/cron still act only on rows owned by their order. Kill switch: FST_FULFILLMENT_DISPLAY_AGGREGATION_OFF constant.