/**
 * Stage Router — core routing logic for stage advancement.
 * Evaluates the stage graph DAG and determines next stage based on gate verdict.
 * (arc42 §5.1, spec §FR-01)
 */
import type { GateVerdict, StageId } from '../types/index.js';
import { StageGraph } from './stage-graph.js';
/** Router that advances stages based on gate verdicts and a flow graph. */
export declare class StageRouter {
    private graph;
    constructor(graph?: StageGraph);
    /**
     * Determine the next stage given current stage and gate verdict.
     *
     * - If verdict.conclusion !== 'passed', returns null (stay at current stage).
     * - Otherwise, evaluates outgoing edges. First matching conditional edge wins.
     *   If no conditional edge matches, the first unconditional edge is used.
     * - Returns null if no valid transition exists (terminal stage).
     */
    advance(currentStage: StageId, verdict: GateVerdict): StageId | null;
    /** Replace the current graph (for custom flow registration). */
    setGraph(graph: StageGraph): void;
    /** Get the current graph. */
    getGraph(): StageGraph;
}
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