Send milestone change alerts to deal handoffs thread

You lose handoff context when a deal's sub‑milestone changes, causing prep gaps. The workflow posts a detailed message to your deal handoffs thread so owners can triage within minutes.

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Overview

Deal handoffs stall when owners don't have immediate context — that slows closings and creates rework. This workflow publishes structured milestone updates into the deal handoffs thread so sales ops and owners can triage within minutes and keep pipeline velocity.