This design assumes a centrally governed security operating model where all AI and modernised workloads are executed within enterprise data centre boundaries under strict identity-first control on on-premises infrastructure. Governance is enforced through directory-led access discipline and continuous monitoring, with Microsoft Entra ID anchoring identity assurance and Microsoft Purview reinforcing compliance visibility. Consumption follows a least-privilege model, ensuring all interactions are authenticated, authorised, and auditable before execution. The approach prioritises containment, traceability, and resilience over open or decentralised workload execution.