Changes to Create Agent Session

removed the request property claude_code_oauth_token

removed the request property harness

added the new optional request property harness

added the required property harness to the response with the 200 status

added the new claude-opus-5-5 enum value to the model response property for the response status 200

the model request property default value changed from claude-opus-4-8 to claude-opus-5-5

added the new claude-opus-5-5 enum value to the request property model

added the optional property active_plan_id to the response with the 200 status