Function runtime_config 

pub fn runtime_config() -> Arc<BurnConfig>

Returns the current [BurnConfig], cached in thread-local storage on native targets.

On the first call from a given thread this fetches the global config via [BurnConfig::get] (which locks a spin mutex) and caches the Arc thread-locally. Subsequent calls on the same thread only pay an Arc clone. On no_std builds this is equivalent to [BurnConfig::get].

Safe because [BurnConfig::set] panics after the first read, so the cached snapshot matches the global singleton for the whole program lifetime.