pub fn run_data_systems(
world: &mut World,
runtime: &Runtime,
deck: &mut OutputDeck,
phase: TickPhase,
)Expand description
Runs every [DataSystemRegistration] declared for the given phase, in a
stable order: topological by runs_after, then by order_hint, then by
name for full determinism.
deck is the per-tick typed [OutputDeck] the lanes wrote into during
the CLAD descent. Maintenance-phase systems drain typed writeback
slots from it (deck.take::<MyWriteback>()) and apply the results to
ECS components. Pre-scheduler phases pass a transient empty deck.
On a cycle in runs_after the function logs an error and falls back to
the (order_hint, name) ordering — execution still happens, just not in
DAG order. Validating cycles at registration time is a future improvement.