Stage that runs an Elixir function.
Wraps a handler function as a pipeline stage. Supports both item-level and batch-level processing.
Options
:handler- Function(Slither.Item.t(), Slither.Context.t() -> term())that processes a single item. The return value becomes the item's new payload. Can also return{:ok, payload},{:skip, reason},{:error, reason}, or{:route, dest, payload}.:batch_handler- Optional function for batch processing.:cardinality-:one(default) or:many. When:many, the handler returns a list and each element becomes a separate downstream item.