The part build-step lacks the check job's toolchain and types the check answer's fetch as the fetch arguments; both are kept in askrun_gaps.go until the part has them.
Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i
An image built unnumbered is published by its digest; the builder's
version.numbered now publishes it under its version, sending nothing.
The late publish moved into buildstep, so mesh-build-go and
mesh-build-image share one.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig