A standalone parent (PlanningPhase.None) with existing Idle/Queued children
now runs itself first, then sequences its children instead of flat-enqueuing
all of them at once: SubmitForChildrenAsync calls
PlanningChainCoordinator.SetupChainAsync(enqueue: true) right after the
Running -> WaitingForChildren transition, mirroring the planning path but
firing immediately instead of waiting for an explicit "Queue plan". Planning
parents are left untouched (they queue via QueuePlanAsync), and a child
already Running makes SetupChainAsync throw, which is now caught and logged
so it can't fail the parent's own transition.
mika kuns
d2648f965c