This skill should be used when the user says "document infra change", "infrastructure documentation", "generate runbook", "infra docs", "arn infra document", "create infra changelog", "document infrastructure", "generate infrastructure docs", "infra documentation", "create runbook", "generate changelog", "arn-infra-document-change", or wants to generate operational documentation (runbooks, architecture updates, changelogs, environment docs) from completed infrastructure changes.