Function listenValidation

listenValidation(fn: (error: Error) => void): () => void
Subscribes to risk validation errors with queued async processing.

Emits when risk validation functions throw errors during signal checking. Useful for debugging and monitoring risk validation failures. Events are processed sequentially in order received, even if callback is async. Uses queued wrapper to prevent concurrent execution of the callback.
Parameters
- fn: (error: Error) => void
  Callback function to handle validation errors
Returns () => void
Unsubscribe function to stop listening to events
Example
```
import { listenValidation } from "./function/event";

const unsubscribe = listenValidation((error) => {
  console.error("Risk validation error:", error.message);
  // Log to monitoring service for debugging
});

// Later: stop listening
unsubscribe();
```
- Defined in types.d.ts:3404