Idempotence isn't a dirty word
summary
Shows concrete PowerShell patterns: hosts file line management that strips and reinstates lines, AD user creation with group checks that queries existing users before altering memberships, and module signing on a fresh build agent that installs prerequisites and verifies certificates to avoid failing builds. Demos capture exit codes, use registry checks to detect installs, expose fragile regex pitfalls, and outline a DSC class with Get/Set/Test methods for rerunnable configuration enforcement.
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