/** Read a pane's `@crtr_node` option ('' when unset / pane gone). */
export declare function paneTag(pane: string): string;
/** Every pane in `session` whose `@crtr_node` tag names `id` — the node's live
 *  on-screen viewer panes. A correct dedup keeps this at exactly 1. */
export declare function taggedViewerPanes(session: string, id: string): string[];
/** Every pane in `session` with the facts that explain a missing viewer, plus
 *  the tail of what each pane actually rendered. */
export declare function describeSessionPanes(session: string, tailLines?: number): string;
/** Wait until `id` has exactly one tagged viewer pane in `session` and return it
 *  — the attach client sets `@crtr_node` asynchronously on connect, so a test
 *  must let the viewer connect before reading the registry. */
export declare function waitForOneTaggedViewer(session: string, id: string, timeoutMs?: number): Promise<string>;