A group of the controller, the node-engine and the lab, each ready, was
refused as a cycle: built by put the controller's member first, engine
before controller the node-engine's. ADR 0249 ranks the rules (declared,
then built by and version skew, then engine before controller) and
supersedes ADR 0239's sentence that made a declared order against an
inferred one a cycle; design 47 says the precedence. Resolved by
mesh-controller #134 and mesh-catalog #119, replay R309 (mesh-lab #64).
