use serde::Deserialize;use serde::Serialize;/// Lifecycle status attached to a directional thread-spawn edge.#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]#[serde(rename_all = "snake_case")]pub enum ThreadSpawnEdgeStatus {    /// The child thread is still live or resumable as an open spawned agent.    Open,    /// The child thread has been closed from the parent/child graph's perspective.    Closed,}#[cfg(test)]mod tests {    use super::*;    use pretty_assertions::assert_eq;    #[test]    fn thread_spawn_edge_status_serializes_as_snake_case() {        assert_eq!(            serde_json::to_string(&ThreadSpawnEdgeStatus::Open)                .expect("open status should serialize"),            "\"open\""        );        assert_eq!(            serde_json::to_string(&ThreadSpawnEdgeStatus::Closed)                .expect("closed status should serialize"),            "\"closed\""        );        assert_eq!(            serde_json::from_str::<ThreadSpawnEdgeStatus>("\"open\"")                .expect("open status should deserialize"),            ThreadSpawnEdgeStatus::Open        );        assert_eq!(            serde_json::from_str::<ThreadSpawnEdgeStatus>("\"closed\"")                .expect("closed status should deserialize"),            ThreadSpawnEdgeStatus::Closed        );    }}