Function surface_activity_error 

pub fn surface_activity_error(
    runtime: &RuntimeHandle,
    parent_pid: Pid,
    activity_pid: Pid,
    error: ActivityError,
) -> Result<(), EngineError>

Attach a typed activity error to a trapped activity EXIT signal.

This helper is used by the runtime/AT seam when an activity implementation has produced a classified ActivityError before the linked process exits.

Errors

Returns EngineError::Runtime when the workflow process is no longer live.