Create personal workload cards when added to board

When members are added to a board, personal tasks often lack visibility and handoffs stall. Create cards on each member's personal workload board so coordinators see assigned work for same-day triage.

Overview

When teammates are added to a board, their personal task queue can remain empty and work gets missed; this flow instantly creates workload cards so new members and coordinators have visible assignments. That clears onboarding friction and enables same-day triage for incoming work.