Announce current on-call engineer to the team channel

Your on-call changes go unannounced, causing confusion and slow paging during incidents. This posts the current on-call user into the channel so responders know who to contact immediately.

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Overview

When rotation updates are missed, responders waste time finding who is on call and incidents slow down. This flow posts and tags the current on-call engineer in your team channel so responders see who to page immediately, cutting lookup delays within minutes.