fix: remove unnecessary context initialization in NewStateful

The ctx field was being set to context.Background() in NewStateful but not in New, creating an asymmetry. Since Go() overwrites this field anyway, the initialization was redundant.

Author: umputun

pool.go

@@ -111,7 +111,6 @@ func NewStateful[T any](size int, maker func() Worker[T]) *WorkerGroup[T] {
 		workerMaker:    maker,
 		workerChanSize: 1,
 		batchSize:      10, // default batch size
-		ctx:            context.Background(),
 
 		// initialize channels
 		workersCh:     make([]chan T, size),