/**
 * Format a Date as a local-timezone timestamp string: YYYY-MM-DD HH:MM:SS±HH:MM
 * Returns null when the date is invalid (non-finite time value).
 *
 * This format is used both when writing user messages (agent.ts) and when
 * reading history back into sessions (agent-memory-file-manager.ts). Keeping it
 * in one place ensures normalizeComparableText's regex stays valid.
 */
export declare function formatLocalTimestamp(date: Date): string | null;
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