/**
 * `chaosbringer diff <left.json> <right.json>` — compare two independent
 * crawl reports and surface cluster / page differences.
 *
 * Distinct from `--baseline`, which assumes the left is "yesterday's
 * good run" and the right is "today's run". The standalone subcommand
 * is symmetric: it shows left-only, right-only, and shared clusters
 * without claiming a direction. Designed for the dual-runtime
 * regression workflow described in #88 — same site data, two runtimes,
 * separate which clusters are unique to each side from third-party
 * noise that appears in both.
 *
 * The heavy lifting (cluster matching, page state computation) lives
 * in `diffReports` so behaviour stays consistent with `--baseline`.
 */
export declare function runDiffCli(argv: string[]): Promise<void>;
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