export declare function migrateCodexConversionConfigIfNeeded(value: unknown, inheritedCompaction?: {
    continuity: import("./config-contract.ts").ContinuityStrategy;
    historyStorage: import("./config-contract.ts").HistoryStorage;
    shareSubagentContext: boolean;
    method: import("./config-contract.ts").CompactionMethod;
    v2UserMessageRetention: import("./config-contract.ts").V2UserMessageRetention;
}): {
    migrated: boolean;
    config: unknown;
};