export interface Checkpoint {
    id: string;
    label: string;
    timestamp: number;
    commitRef: string;
}
/**
 * Manages lightweight checkpoints using git commits on a shadow branch.
 * Checkpoints allow undo/restore of working tree state.
 */
export declare class CheckpointManager {
    private stack;
    private enabled;
    constructor();
    get isEnabled(): boolean;
    /**
     * Create a checkpoint of the current working tree state.
     */
    createCheckpoint(label: string): string | undefined;
    /**
     * Restore the last checkpoint, undoing changes made since it was created.
     */
    restoreLastCheckpoint(): {
        success: boolean;
        label?: string;
    };
    /**
     * List all checkpoints in the stack.
     */
    listCheckpoints(): readonly Checkpoint[];
    /**
     * Remove checkpoints older than maxAge milliseconds.
     */
    pruneOldCheckpoints(maxAgeMs: number): number;
    /**
     * Clear all checkpoints.
     */
    clear(): void;
    private getCurrentHead;
}
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