When a ticket gets the 'needs-engineering' tag, create a Linear issue with full context. Notify the customer (via Zendesk) when fix ships.
Each step is a single node on the canvas. Order matters; everything else is dragging.
Zendesk Ticket Updated with tag='needs-engineering'.
Linear Create Issue with title from ticket subject, description with ticket body + customer context.
Update Zendesk custom field with Linear identifier for round-trip.
Linear Issue Done → Zendesk Add Comment (public) to original requester.
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