pub fn unknown_key_warnings(store: &Store) -> Result<Vec<String>>Expand description
Forward-compat surfacing (T3): a warning: (NOT a violation) per tolerated unknown top-level
key, so a typo’d field name stays visible instead of silently parsing through. schema_version
is read LAZILY here — at the tolerate-vs-reject decision — so a future reader can sharpen the
rule per declared baseline without making schema_version a parsed Config field.