/**
 * Reversibility + audit for skill applies (ADR 0001, Phase 2).
 *
 * Operates on the global install store (`~/.enterprise-skills`): the
 * tool-managed `skills/` tree + `registry/canonical-skills.yaml` manifest that
 * `installBundle` writes. Every function takes an explicit `root` so it is
 * testable against a temp directory. Best-effort and non-throwing — a snapshot
 * or audit failure must never abort an apply.
 */
/**
 * Snapshot the current store into `<root>/.update-restore/<timestamp>/` so an
 * apply can be rolled back. Returns the restore dir, or null when there is
 * nothing to snapshot.
 */
export declare function snapshotStore(root: string): string | null;
/** The newest valid restore directory, or null. */
export declare function latestRestore(root: string): string | null;
export interface RollbackResult {
    restored: boolean;
    from?: string;
}
/** Restore the most recent snapshot's skills + manifest back into the store. */
export declare function rollbackStore(root: string): RollbackResult;
export interface UpdateAuditEntry {
    at: string;
    action: "auto-apply" | "manual-apply" | "rollback";
    actor: "auto" | "user";
    skills?: {
        skill_id: string;
        from: string;
        to: string;
    }[];
    restore_point?: string | null;
    note?: string;
}
/** Append an audit line to `<root>/.update-audit.jsonl`. Never throws. */
export declare function appendUpdateAudit(root: string, entry: UpdateAuditEntry): void;
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