Send stage-based SMS to candidates from hiring board

Candidates miss assessment links and booking windows when stage moves aren't reinforced with SMS. This sends stage-based texts so applicants get next steps same day.

Overview

Missed assessment completions and no-shows slow down hiring; this flow sends stage-specific SMS within minutes of a stage change so applicants get clear next steps. Recruiters then see delivery notes on candidate profiles the same day for faster triage.