ADR 0593 §1: the step runner left mesh-sdk for mesh-build-go's buildstep package, so the examiner's unit
tests and the module's integration test require it by the group's version (as the builder does) rather
than an imitation of its plan and kept-verdict rules.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL