In your switchyard.xml defining the rules service, you can add a resource definition which points to a knowledge package in the Guvnor repository.
See the section on "Using a KnowledgeAgent" and "Using a Rules Repository".
Rules don't execute "in guvnor repository". They are retrieved from Guvnor using a KnowledgeAgent, and executed wherever the KnowledgeSession is running. In SwitchYard, for example.
To do this, you have to configure the SwitchYard Rules Component to use a KnowledgeAgent, and you have to configure your ChangeSet.xml to point to the knowledge package inside Guvnor.
Please see the "Using a KnowledgeAgent" and "Using a Rules Repository" sections of the documentation for more information: