Function invoke 

pub fn invoke(
    _node: &NodeProto,
    inputs: &[(&str, &dyn SlotValue)],
    _ctx: &mut RuntimeResourceRef<'_>,
) -> Result<DispatchResult, OpError>

Invoke fn - clone each child_{i} input into the envelope via SlotValue::clone_boxed and emit a single CompositeValue on the bundle output port. Bind-site port ordering survives because the DSL recorder stamps inputs in positional order; the op preserves that order in the resulting Vec.