/**
 * The git reads behind a receipt: which commit was tested, and what has changed since.
 *
 * Paths are compared relative to the repository's top level, and the instance's state
 * directory is expressed the same way, so a project nested inside a larger repository
 * still recognises its own state files.
 *
 * Requirements: tool-written-test-receipts/AC-6, AC-13, AC-14
 */
export type ChangedResult = {
    ok: true;
    paths: string[];
} | {
    ok: false;
    reason: string;
};
/** HEAD's full sha; null outside a repository or before the first commit (AC-9). */
export declare function headCommit(projectRoot: string): string | null;
/**
 * Paths outside `.aidlc/state/<instance>/` that differ.
 *
 * With `since` null: from the working tree's status — the dirty check before a run
 * (AC-6). With a commit: that commit against the working tree, so committed, staged
 * and unstaged changes all count, plus untracked files (AC-13, AC-14). A commit git
 * cannot resolve — a shallow CI clone — is a failure, which reads as stale.
 */
export declare function changedOutside(projectRoot: string, instance: string, since: string | null): ChangedResult;
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