The rule of an artifact the builder packs or fetches itself was written twice,
in the indexer's seed and in the runner's placing; both now read the one in
mesh-delivery-sdk's buildstep, the contract of a build step every delivery
part reads.
Builds: design 47 G A-324, A-325
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h