Custom Zustand Middleware for Advanced E-commerce Logging and Debugging

Act as a DevTools and Observability Engineer. Build a sophisticated, custom Zustand middleware function specifically designed for debugging an enterprise e-commerce platform. The middleware must meticulously trap and log all state transitions at the specified [LOG_LEVEL], but it must contain a strict regex/validation layer that automatically intercepts and brutally redacts highly [SENSITIVE_KEYS] (like credit card hashes, passwords, or PII) before they ever hit the console. Furthermore, engineer the middleware to selectively batch and asynchronously transmit specific, high-value state mutations (e.g., `SET_CART_TOTAL`) directly to an external [ANALYTICS_ENDPOINT] for user behavior tracking. Guarantee the middleware utilizes `setTimeout` or Web Workers so it fundamentally cannot introduce main-thread latency.