A data center operations team wants proactive detection of configuration drift, forwarding inconsistencies, and pre-change impact validation across their ACI and NX-OS fabrics. They deploy Cisco Nexus Dashboard with an AI/ML-powered assurance service that continuously ingests telemetry and models the network's intended state versus actual state. Which capability of this service specifically allows the team to simulate a proposed policy change and predict whether it will introduce connectivity or contract violations BEFORE the change is committed to the fabric?