Address incorrect const-compatibility review comment

[Copilot]

This PR addresses feedback on #159 regarding an incorrect code review comment about usize::from_str_radix not being const-compatible.

Resolution

No code changes required. The original code is correct:

const fn get_k_k() -> usize {
    match option_env!("KADCAST_K") {
        Some(v) => match usize::from_str_radix(v, 10) {
            Ok(e) => e,
            Err(_) => DEFAULT_K_K,
        },
        None => DEFAULT_K_K,
    }
}

usize::from_str_radix was stabilized for const contexts in Rust 1.85.0 (rust-lang/rust#124941). The project uses Rust 1.85, so this implementation is valid.

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