Send processing complete message to relevant team channel

You miss completed motion-capture runs when board status changes aren't broadcast, leaving session outputs unreviewed and delaying analysis. Notify the correct team channel so reviews start same day.

Overview

Completed processing runs should not sit idle in a board — this flow broadcasts finished sessions directly to the right team channel so data scientists and ops can start review the same day. That turns passive board updates into immediate action and keeps downstream analysis on schedule.