Advanced Zustand Custom Middleware for Telemetry

Act as a Frontend Observability Engineer. Build a sophisticated, highly performant custom Zustand middleware function specifically designed to intercept and log application state mutations for an enterprise platform. The middleware must meticulously trap all state transitions, but it must contain a strict regex/validation layer that automatically and brutally redacts highly [SENSITIVE_STATE_KEYS] (like credit card hashes, passwords, or PII) before they ever leave the client device. Furthermore, engineer the middleware to selectively batch and asynchronously transmit only the specific, high-value state mutations defined in the [TRACKED_ACTIONS] array (e.g., `SET_CART_TOTAL`) directly to the external [TELEMETRY_PROVIDER] (e.g., Datadog RUM or Segment). Guarantee the middleware utilizes Web Workers or `requestIdleCallback` so it fundamentally cannot introduce main-thread latency.