/**
 * Atomic JSON file replacement. Callers persist state that another process
 * may read at any moment, so a partially written file must never be observable.
 */
/**
 * Writes `value` as pretty JSON to `filePath`, creating parent directories.
 *
 * The write lands in a sibling temp file and is then renamed, which is atomic
 * on POSIX, so a concurrent reader sees either the old file or the new one and
 * never a half-written document. The pid in the temp name keeps two processes
 * writing the same target from clobbering each other's temp file. Mode 0600
 * matches the rest of groundcrew's state, which can carry task titles.
 */
export declare function writeJsonAtomic(filePath: string, value: unknown): void;
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