Employee Service (ITSM) Channels Setup Coordinator

Top-level interactive coordinator for Employee Service (ITSM) channel setup. Presents menu of channel setup options (Portal, Teams, Slack) and delegates to the corresponding skill. Use this for: 'setup ITSM channels', 'configure employee service channels', 'set up service cloud communication channels', 'I want to configure ITSM integrations', or any general request for ITSM channel/integration setup where the user hasn't specified exactly which channel they want. DO NOT TRIGGER for requests that already name a specific channel or child skill (e.g. 'configure Teams', 'set up Slack', 'create an employee portal', 'configure ITSM notifications') — route directly to the matchi…