This skill should be used when the user says "deploy", "deploy to staging", "deploy to production", "promote to production", "infra deploy", "arn infra deploy", "deploy infrastructure", "apply infrastructure", "push to prod", "go live", "tofu apply", "terraform apply", "pulumi up", "cdk deploy", "fly deploy", "deploy to railway", "release to prod", "promote environment", or wants to execute a deployment of their infrastructure to a target environment. This skill handles environment promotion, CI/CD enforcement, cost gates, safety layers, and resource tracking.