pub fn drain_external_signals(arrays: ResMut<'_, ArraySignals>)Expand description
Per-tick system that drains queued external Array / Clear mutations into ArraySignals.
Scalar signal writes were routed through push_external_property in wave-D and are committed
to PropertyStore by crate::property_store::drain_external_properties; only the legacy
Array path remains here.
No-ops on an empty channel.