Run each benchmark arm in a hermetic fixture-only world materialized
outside the repo, so the no-skill baseline can no longer discover the
skill's assets on disk. The new-skill arm's skill is materialized to an
isolated temp path it is pointed at; the baseline gets no skill and is
told to stay within its world.
A live 5-trial axi-review run confirms the fix: all baseline transcripts
are clean of AXI-PRINCIPLES.md, the baselines invent their own generic
rubric (the honest counterfactual), and the Efficacy verdict is green
5/5 where the contaminated 0004 run had scored red 2/5.
Runner prose only; the deterministic core is untouched.
alexion
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