/**
 * Calibration store for slice work-estimation.
 *
 * v1 (current): pure heuristic based on LoC + test count + complexity.
 *   confidence: 'low' until >= 5 historical slice records exist.
 *   formula: minutesP50 = 0.25 * locSum + 0.5 * testCount + 0.1 * complexitySum
 *            minutesP90 = minutesP50 * 1.6
 *
 * v1.1 (next): read `.peaks/_runtime/<sessionId>/qa/cycle-time.json` history; if
 *   sample size >= 5 for a complexity bucket, switch to percentile-based
 *   estimate with confidence 'high'.
 *
 * v1 rationale: peaks-loop itself has fewer than 5 completed refactor slices
 * (per the design doc R3), so v1 cannot be calibrated yet. v1 ships the
 * heuristic AND records every estimate to `.peaks/_runtime/<sid>/sc/
 * slice-calibration/<rid>.json` so the next slice can use the prior data.
 *
 * LoC is intentionally kept as a primary input (not replaced). The user
 * feedback that motivated the algorithm explicitly cited LoC as a useful
 * signal -- the issue was the absence of a DAG on top, not the absence
 * of LoC. The "complexity" field in nodes is unused for v1 because
 * codegraph v0.7.10 does not emit it; v2 can re-enable once
 * `.codegraph/codegraph.db` is read directly.
 */
import type { WorkEstimate } from './slice-decompose-types.js';
/**
 * Compute a work-estimate envelope.
 *
 * @param complexitySum Sum of `complexity` of touched graph nodes. Pass 0
 *                      when codegraph v0.7.10 (the field is not emitted).
 * @param testCount     Number of test files this slice adds/modifies.
 * @param locSum        Sum of LoC across the slice's primary files.
 * @param sampleSize    Number of historical slice records the calibrator
 *                      could draw from. Drives confidence:
 *                        >= 5 -> 'high' (percentile lookup would be used in v1.1)
 *                        >= 1 -> 'medium' (some signal)
 *                         == 0 -> 'low' (heuristic only)
 */
export declare function calibrate(complexitySum: number, testCount: number, locSum: number, sampleSize: number): WorkEstimate;