Module backpressure 

Backpressure controller to bound in-flight work and prevent memory blowouts.

Uses tokio semaphores and bounded channels to limit concurrent tasks, ensuring the crawler stays within resource budgets.

Structs

BackpressureController

Backpressure controller for bounded pipeline channels.

BackpressurePermit

RAII permit for backpressure.

BoundedPipeline

Bounded channel wrapper with backpressure.

Enums

BackpressureError

Errors from backpressure operations.