versions.NumberedBody and NumberedEvent are mesh-sdk's delivery.VersionNumbered and VersionNumberedEvent now (J3), the
contract a build module consumes for BG2's late publish; the body's JSON is unchanged. The lane reads a step's
out-of-step files through delivery.BuildAnswer.OutOfStep, a failed step's result too (as before, A2k's d15d66fc: read
before the step's state; its three rows hold it), in place of a local decode by name. The integration test hears
version.numbered on delivery.VersionNumberedSubject and reads it with DecodeVersionNumbered, as a build module does.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig