Composing a pipeline

TODO: put ops together with >>, and supply cross-cutting data via ambient context.

Chain ops

pipeline = DetectPII("us") >> Redact()
pipeline("call me at 555-123-4567")

TODO: how chaining flattens; output of each stage feeds the next.

Ambient context

with pipe.Pipe.context(LegalRequestContext(jurisdiction="us/ny")):
    result = pipeline(text)

TODO: why context beats threading arguments through every op.