/**
 * Write a file atomically: write to a unique temp file in the same directory,
 * then rename over the target. The same-directory temp keeps the rename on one
 * filesystem (rename across mounts is a non-atomic copy), so a reader can never
 * observe a torn, half-written file — it sees either the old content or the
 * new. Used for handshake files like a subagent's result.json, where a reader
 * (the parent pool) may race a writer that gets SIGKILLed mid-write.
 *
 * Throws on failure like writeFileSync; callers that treat persistence as
 * best-effort keep their own try/catch.
 */
export declare function writeFileAtomicSync(path: string, data: string): void;
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