Proving
Proving is the first rung. In the Volunteer Commons — pseudonymous, public, open to anyone with no application or vetting — you contribute on real public work under a callsign. The action itself is the only credential.
Nothing here is paid, and that is the point: this is where you demonstrate what you can do on work anyone can inspect. A proven record on the Commons is what makes you eligible for the paid work that follows — it is the evidence the Real-Identity Workplace recruits from.
Learning the craft happens in learn; proving it on real tasks happens here.
(Stub — expand: how the Commons is entered, how a proven record accrues, how it feeds recruitment into contract work.)