How can I be notified when a change is deployed to production?

You can easily configure the admin to send out an email when a change has been pushed to production with the following two properties that are found in config/bc/enterprise/common.properties out of box.

workflow.scheduled.deploy.transactional.email.distro=team@mycompany.com
workflow.promote.transactional.email.send.on.success=false

Simply override these properties in your properties file.