/**
 * Recursively list project files as relative posix paths, skipping dependency
 * / build / VCS directories. Pure (no cache): the caller (`prompt-area`) owns
 * the result in React state and refreshes it on each idle mount and whenever
 * `@` is entered — so files an agent created during a run show up immediately
 * on the next prompt, with no restart.
 */
export declare function getFileIndex(root?: string): string[];