Function stage_attached 

fn stage_attached(
    ctx: &mut LauncherCtx<'_>,
    pair_id: &str,
    session_id: &str,
    directory: &Path,
    opencode_bin: &Path,
    server_url: Option<&str>,
) -> Result<(Option<Terminal>, PathBuf), ToolError>

The new record (controller: null, generation 1, tab from the terminal walk), then the wrapper, then the tab.