JSON File Writing Must Be Atomic

• You MUST use safeWriteJson(filePath: string, data: any): Promise<void> from src/utils/safeWriteJson.ts instead of JSON.stringify with file-write operations
• safeWriteJson will create parent directories if necessary, so do not call mkdir prior to safeWriteJson
• safeWriteJson prevents data corruption via atomic writes with locking and streams the write to minimize memory footprint
• Test files are exempt from this rule