/**
 * The `--fail-under <n>` CI gate (M8): a pure predicate turning a run's
 * headline score into an exit code.
 *
 * Honest: any run flagged partial by `isPartialRun` (cost cap, degraded profile,
 * skipped engines, or an engine that answered only some prompts) produces a partial
 * score, so the result is flagged {@link FailUnderResult.partial} and says so -
 * the caller (M11 CLI) decides how loudly to surface it, but the number is
 * never presented as a full-confidence measurement.
 */
import { type VisibilityEnvelope } from './envelope.js';
/** Outcome of a `--fail-under` check. */
export interface FailUnderResult {
    /** Whether the gate passed (no threshold, or score >= threshold). */
    passed: boolean;
    /** Process exit code: 0 pass, 1 fail (CI convention). */
    exitCode: number;
    /** The run was partial (see `partialCauses`); the score is an incomplete sample. */
    partial: boolean;
    /** Human-readable one-liner explaining the outcome. */
    reason: string;
}
/**
 * Evaluate the `--fail-under` gate. With no threshold the gate always passes.
 */
export declare function failUnder(envelope: VisibilityEnvelope, threshold?: number): FailUnderResult;