mod pid;use std::path::Path;use std::path::PathBuf;use serde::Serialize;pub(crate) use pid::PidBackend;#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]#[serde(rename_all = "camelCase")]pub enum BackendKind {    Pid,}#[derive(Debug, Clone)]pub(crate) struct BackendPaths {    pub(crate) codex_bin: PathBuf,    pub(crate) pid_file: PathBuf,    pub(crate) update_pid_file: PathBuf,    pub(crate) remote_control_enabled: bool,}pub(crate) fn pid_backend(paths: BackendPaths) -> PidBackend {    PidBackend::new(        paths.codex_bin,        paths.pid_file,        paths.remote_control_enabled,    )}pub(crate) fn pid_update_loop_backend(paths: BackendPaths) -> PidBackend {    PidBackend::new_update_loop(paths.codex_bin, paths.update_pid_file)}pub(crate) async fn append_stderr_log_tail_context(pid_file: &Path, context: &mut String) {    match pid::read_stderr_log_tail(pid_file).await {        Ok(Some(tail)) => tail.append_to_context(context),        Ok(None) => {}        Err(err) => {            context.push_str(&format!(                "\n\nFailed to read managed app-server stderr log: {err:#}"            ));        }    }}