Function query_id 

pub fn query_id(cmd: &str, args: &[&str]) -> String

Plan D t-005: deterministic query id for wrapper-side dedup. query_id("read", &["store.pricing.rates.get_rate"]) → "Qf3a2b1c..." (first 7 hex chars of blake3 of the joined input). Same inputs → same id; safe to compare across processes.