Create team mention from coach nickname for routing

Coach nicknames arrive without user IDs, causing missed or misdirected mentions during incident handling. Get correct chat mentions and user IDs returned to the caller so coordinators notify coaches immediately.

Overview

When nicknames arrive without user identifiers, incident routing stalls and coordinators waste time on manual lookups. This reusable subroutine maps nicknames to mention text and user IDs and returns them to the calling workflow so your team can notify the right coach immediately during triage.