Constant KTSTR_VERIFIER_SCHEDULER_ENV 

pub const KTSTR_VERIFIER_SCHEDULER_ENV: &str = "KTSTR_VERIFIER_SCHEDULER";

Name of the environment variable carrying the operator’s cargo ktstr verifier --scheduler <NAME> filter. Set by the dispatcher in src/bin/cargo_ktstr/verifier.rs; read by crate::test_support::dispatch’s verifier cell emission, which skips every declared scheduler whose name does not equal the value so the sweep runs one scheduler across topologies instead of the full declared-scheduler matrix. Unset, every declared scheduler is swept. Single source of truth so the writer (dispatcher) and reader (emission) do not spell the name by hand.