Worker → host → caller agent-run envelope (§25). Long-running work: the host returns a run id plus declared artifacts and RE-validates the declared channel + artifact containment at COMPLETION, not only at return (two-phase).
agent-run
Worker → host → caller
agent-runenvelope (§25). Long-running work: the host returns a run id plus declared artifacts and RE-validates the declared channel + artifact containment at COMPLETION, not only at return (two-phase).