Idempotency in IaC

Summary

Applying the same IaC configuration multiple times should converge to the same end state without unintended side effects — the same idempotency principle from Phase 5's scripting, now applied to infrastructure.

• 1Apply the same Terraform or Ansible configuration twice and confirm the second run makes no changes.
• 2Learn why non-idempotent infrastructure code is dangerous to re-run after a partial failure.
• 3Understand this is a core design goal of both Terraform and Ansible, not an accident.