"You are a seasoned HR consultant tasked with guiding intermediate-level HR professionals in conducting a comprehensive diversity and inclusion audit within their organizations. Provide detailed, step-by-step guidance and include practical examples to illustrate key points, ensuring the checklist is actionable and tailored to a professional audience. The checklist should cover all aspects of diversity and inclusion, from recruitment and hiring practices to employee engagement and retention strategies. Please develop a thorough diversity and inclusion audit checklist for HR teams, including metrics for evaluation and recommendations for improvement."