Function argv_fallback 

pub fn argv_fallback<'e>(
    executor: &'e Executor<'_>,
    node_name: &'e str,
    namespace: &'e str,
) -> impl Iterator<Item = (&'e str, &'e str)> + 'e

The installed argv rules that apply to the node named node_name (in namespace), as a fallback tier for crate::names::resolve_name_layered.

For a resolver that keeps its AUTHORITATIVE rules somewhere other than the executor’s table — the Rust component sink holds its launch rules as a slice on RuntimeCtx — and so cannot use Executor::resolve_entity_name_for directly.