/**
 * peaks-loop v3.0.0 — Slice C.1
 *
 * Monotonic-improvement guard for the loop runtime. Compares adjacent
 * cycles' per-evaluator scores (rescaled gateAction → 0..1) and
 * returns a structured envelope indicating:
 *
 *   - status: 'pass' | 'warn' | 'block' | 'skip'
 *   - regressions: per-evaluator score deltas where current < previous
 *   - reason: human-readable summary
 *
 * Karpathy §2 Simplicity First: pure function, no IO, no new deps.
 *
 * File budget: ≤ 800 lines (Karpathy §2).
 */
import type { CheckMonotonicOptions, MonotonicCycle, MonotonicReport, MonotonicScoreRow } from './monotonic-guard-types.js';
export type { CheckMonotonicOptions, MonotonicCycle, MonotonicRegression, MonotonicReport, MonotonicScoreRow } from './monotonic-guard-types.js';
/** Convert an envelope-shaped verdict row to `MonotonicScoreRow`.
 *  Pure helper, exported for the CLI layer. */
export declare function toScoreRow(evaluator: string, gateAction: 'pass' | 'warn' | 'block', degraded: boolean, observedAtIso?: string): MonotonicScoreRow;
/** Default threshold = 5% of [0,1] scale → 0.05. */
export declare const DEFAULT_MONOTONIC_THRESHOLD = 0.05;
/** Compare `previous` against `current` and report monotonicity.
 *
 *    - missing previous cycle → skip (`MONOTONIC_NO_PREVIOUS`)
 *    - evaluators not present in both cycles → skip that evaluator
 *    - score unchanged / up → ok
 *    - score ↓ ≤ threshold → ok
 *    - score ↓ > threshold → regression row + status 'block'
 *      with `code = MONOTONICITY_VIOLATION`.
 */
export declare function checkMonotonicImprovement(previous: MonotonicCycle | null, current: MonotonicCycle, options?: CheckMonotonicOptions): MonotonicReport;
/** Read `.peaks/_sub_agents/<sid>/shared/` cross-session signal — on
 *  any IO error, return `null` so the guard never crashes on missing
 *  cross-batch signal (per Slice C (b) case "跨 session 读
 *  .peaks/_sub_agents/<sid>/shared/ 跨批 signal → 不 crash").
 *  Pure helper; only present for the cross-session case. */
export declare function loadCrossSessionSignal(projectRoot: string, sid: string): MonotonicCycle | null;