profile
What a provider actually serves, and how a request is retracted onto it.
attributeEVERY_EFFORTFinal= Profile.of(*(EFFORTS[1:]))A profile that serves the whole chain; the identity of retraction.
attributeNO_REASONINGFinal= Profile.of()A profile for a model that does not reason: every request retracts to the
least effort, so a model asked for "high" is never sent a parameter it
would reject.