/**
 * Stdout fence (line-buffered JSON-RPC validator)
 *
 * Monkey-patches process.stdout.write at startup.
 * Buffers bytes, splits on newline, validates each complete line
 * as JSON-RPC 2.0. Invalid lines cause a fail-fast throw.
 *
 * Returns a teardown function that restores the original write.
 */
export declare function installStdoutFence(): () => void;
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