Doesn't seem like you can. At least talking to Marcia Chase does nothing.
Edit: Went to my class hall. 6,840 to respec at 13 with 5,700 pooled. Seems like it works. Odd that you have to go to the fountain to spec but your class hall to respec.
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Every artifact doesn't do this though:
We get no extra AP for knowledge, it is simply 700% longer time to get a trait, almost as if it suddently follows normal artifact costs, but without the knowledge to help you.