Auto-update onboarding milestone dates on new agent records

Webhook onboarding subtasks arrive but milestone dates stay blank, leaving coordinators lacking progress visibility. It writes completion timestamps to agent records so milestones display same day.

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Overview

Onboarding subtasks often arrive as webhook events but milestone dates frequently remain unset, forcing coordinators to chase updates. This flow writes completion timestamps directly into the agent record so program coordinators have up-to-date milestones same day and can accelerate setup.