/**
 * Undo a plan's commits as one new commit (revert-by-task D2).
 *
 * The working tree was clean when this starts (`checkRepo`, AC-18), so every
 * failure path can return to the recorded `HEAD` with `reset --hard` and lose
 * nothing but what this run wrote (AC-17).
 *
 * Lifecycle state is never reverted by git: a task commit may carry its own
 * `[x]`, phase YAML or cost records, and undoing those would rewind state by
 * accident. `.aidlc/state/` is restored from `HEAD` after the revert, and the
 * only state change is the checkbox reset this module writes (D3, AC-16).
 *
 * The new commit carries no `Task:` trailer — it would otherwise be selected
 * by the next `--task` run and undone, re-applying the work.
 *
 * Requirements: revert-by-task/AC-15, AC-16, AC-17
 */
import { type Plan } from './plan.js';
export type ApplyResult = {
    ok: true;
    sha: string;
    short: string;
    reset: number[];
} | {
    ok: false;
    reason: 'conflict';
    short: string;
    subject: string;
} | {
    ok: false;
    reason: 'empty';
} | {
    ok: false;
    reason: 'commit-failed';
    detail: string;
};
/** The commit message: subject, one summary line, then git's own revert lines. */
export declare function revertMessage(instance: string, plan: Plan): string;
export declare function applyRevert(projectRoot: string, instance: string, plan: Plan): ApplyResult;
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