/**
 * Thin git plumbing wrappers for doctor migrations (AC-17, AC-8, AC-21).
 *
 * All calls run with cwd = projectRoot so index operations target the
 * CURRENT worktree's index, never another worktree's (AC-21).
 */
/** Files tracked by git under the given pathspecs (NUL-safe). */
export declare function trackedFiles(projectRoot: string, pathspecs: string[]): string[];
/**
 * True when the index has staged changes. Any git failure (unborn HEAD,
 * odd repo states) conservatively counts as staged — the confirm-tier
 * untrack must never tangle into a pending commit (AC-8).
 */
export declare function hasStagedChanges(projectRoot: string): boolean;
/**
 * Committer date of the newest commit touching the given pathspecs, ISO 8601.
 *
 * `null` when nothing matches — an untracked path, an unborn HEAD, or not a repo.
 * The caller must treat that as "no answer" rather than "old": a doc that was never
 * committed is not stale, it is new.
 *
 * `execFileSync` with an argument array, never a shell string, so a pathspec
 * containing a space or a semicolon cannot become a second command
 * (secure-defaults: validate at the boundary, and never build a command by
 * concatenation).
 *
 * Requirements: update-overwrites-authored-context/AC-18
 */
export declare function lastCommitISO(projectRoot: string, pathspecs: string[]): string | null;
/** Quote a path for display when it contains shell-special characters. */
export declare function shellQuote(path: string): string;
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