Expand description
Ergonomic SDK surface over the canonical child-spawn path.
§Anti-fork invariant
There is exactly one implementation of the spawn/execute/finalize logic:
spawn::run_child_spawn. Both the background SpawnScheduler (via
run_spawn_job) and the ergonomic runner::ChildRunner funnel into it.
No caller may duplicate the event ordering, heartbeat/watchdog, runner
reservation, ExecuteRequest construction, or terminal status strings.