/**
 * Native OS folder dialog, shared by runner:pick-folder (static-context / RAG
 * folders) and runner:vault-pick-folder (Obsidian vaults).
 *
 * Browsers can't reveal absolute paths for security, so the runner — which
 * lives on the user's box — pops the dialog. Fixed argv; the prompt is a
 * constant chosen by the caller, never user or model input.
 *
 *   - Windows: the Explorer folder dialog (IFileOpenDialog + FOS_PICKFOLDERS)
 *     through PowerShell. WinForms' FolderBrowserDialog is the old tree view
 *     on Windows PowerShell (.NET Framework), so it is only the fallback. The
 *     dialog is owned by a small topmost window so it opens in front of the
 *     browser instead of behind it.
 *   - macOS: AppleScript `choose folder` run by osascript itself. Wrapping it
 *     in `tell application "System Events"` needs the Automation permission
 *     and fails (-1743) or hides the dialog when it is not granted.
 *   - Linux: zenity, then kdialog.
 */
export type FolderPickResult = {
    path: string;
} | {
    cancelled: true;
};
export declare function pickNativeFolder(prompt: string): Promise<FolderPickResult>;