/**
 * Derive a session title from its first user message.
 *
 * Mirrors `@threadbase-sh/scanner`'s `deriveSessionNameFromFirstMessage`
 * (first line of the first user message, truncated) so a live session gets
 * the same title a resumed/scanned one would compute from the same JSONL —
 * without waiting on the scanner or cache to observe the line.
 */
export declare function deriveSessionName(firstMessageText: string): string;
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