Send day-one welcome message to hiring manager and buddy

Your Day 1 onboarding rows can leave managers without setup context and delay 1:1 scheduling for new hires. It delivers welcome details to managers and buddies the same day.

Overview

When Day 1 rows sit unacted, managers miss setup windows and new hires face delayed access; that slows ramp and hurts first impressions. This flow turns a sheet flag into an immediate DM to managers and buddies, ensuring setup and a welcome 1:1 happen the same day.