Changes to Check local machine readiness (git, tmux, agent harness, gh)

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 500

removed the agent_switch_saga enum value from the reporting_owner response property for the response status 501

added the new github-auth enum value to the requirements/items/id response property for the response status 200

added the optional property reporting_owner to the response with the 500 status

added the optional property reporting_owner to the response with the 501 status

endpoint added