/**
 * Canonical score → human label (ADR-0144).
 *
 * Score *meaning* is owned by `passRate` / upstream aggregates. This only
 * formats a number as `"N%"` with Math.round. Non-finite / negative → `"0%"`.
 * No 0–100 clamp — clamping would hide producer bugs.
 */
/**
 * Format a score number for display.
 *
 * @example formatScore(88)   // "88%"
 * @example formatScore(67.4) // "67%"
 * @example formatScore(NaN)  // "0%"
 */
export declare function formatScore(score: number): string;
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