chain

type Chain[T any] interface {
	// Add registers a modifier at the specified stage with a unique ID.
	// Returns an error if the ID already exists.
	Add(stage Stage, id string, modifier func(context.Context, T) (T, error)) error

	// Remove unregisters a modifier by its ID.
	// Returns an error if the ID does not exist.
	Remove(id string) error

	// Execute runs all modifiers in stage order, transforming the data.
	Execute(ctx context.Context, data T) (T, error)
}

type Stage string