Macro run_hook 

macro_rules! run_hook {
    ($driver:expr, $point:expr, $ctx:expr) => { ... };
}

Dispatch a hook call through the slot’s function pointer.

When the rns-hooks feature is enabled in rns-net, this macro is used at each integration point. When no programs are attached, the noop runner returns None immediately.

When rns-hooks is not enabled, the call site wraps this in #[cfg(feature = "rns-hooks")] so it compiles to nothing.