/**
 * radar-report — aggregate radar sidecars into a corpus/cluster freshness report (#1498).
 *
 * Port of corpus/radar_report.py: totals, overdue count, per-cluster / per-GRADE
 * / per-trajectory breakdowns, an overdue table (most-overdue-first), and a
 * per-radar summary with the §1 GRADE-reassessment rationale snippet. Reuses the
 * shared loader + staleness helper.
 *
 * @source historical: corpus/radar_report.py
 */
export interface RadarReportOptions {
    /** Filter to a single cluster tag. */
    cluster?: string;
    /** ISO date as-of (defaults to today, UTC midnight). */
    today?: string;
}
/** Build the markdown freshness report. Returns a "no radars" note when empty. */
export declare function renderRadarReport(corpusRoot: string, opts?: RadarReportOptions): string;
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