From the Service Client API Documentation, I see there are various categories to subscribe to but I cannot find any documentation on what events each category provides. Is there documentation that explains each category from a real time event perspective?

Example:

      // Subscribe to Workspace Web Edition
      genesys.wwe.service.subscribe(['agent', 'interaction', 'media', 'outbound','system', 'markdone'], eventHandler, this);

So: 

['agent', 'interaction', 'media', 'outbound','system', 'markdone']

I see Namespace documentation that talks about methods but not the different events: 

Service Client API Reference

Event types are documented here: Service Client API - Genesys Documentation

And of course Dev Tools in your browser is your friend in observing what actually happens :)

      // Subscribe to Workspace Web Edition
      genesys.wwe.service.subscribe(['agent', 'interaction', 'media', 'outbound','system', 'markdone'], eventHandler, this);

['agent', 'interaction', 'media', 'outbound','system', 'markdone']