Function kv_scale_census 

pub fn kv_scale_census<'a>(
    names: impl IntoIterator<Item = &'a str>,
    has: impl Fn(&str) -> bool,
) -> Result<KvScaleCensus>

2026-09-28: Parse every name that ends in a known scale suffix to its attention prefix (most specific spelling first), then resolve each prefix with resolve_kv_scale_keys. Any layer that resolver rejects fails the census.