/**
 * The JSONL file sink for `--debug`: one wire-format event per line, appended to
 * `<manifest-dir>/.telo.debug.jsonl`. A pure writer — it does not serialize (that's
 * `debug-serialize.ts`, shared with the SSE server) and does not subscribe to the
 * kernel (the caller owns the single `kernel.on("*")` tap and fans each
 * already-serialized line to both this and the `DebugServer`).
 */
export declare class DebugEventSubscriber {
    private readonly filePath;
    constructor(filePath: string);
    /** Create the directory and truncate the file so each run starts fresh. */
    open(): Promise<void>;
    /** Append one pre-serialized wire line. A write failure is reported, not fatal. */
    write(line: string): Promise<void>;
}
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