/**
 * Zero-effect shadow routing.
 *
 * A shadow policy evaluates the same task context and records what it WOULD
 * have selected, but never executes, never calls a provider, never mutates the
 * workspace, and never affects the current run. Shadow decisions are durable
 * and can later be compared counterfactually.
 */
import type { OrchestrationDecision, OrchestrationFeatureVector, ShadowDecision } from "./types.js";
export interface ShadowRoutingInput {
    productionDecision: OrchestrationDecision;
    shadowPolicyId: string;
    shadowPolicyVersion: number;
    shadowCandidateId?: string;
    reasonCodes?: string[];
    runId?: string;
}
/**
 * Produce a shadow decision. This function is pure with respect to effects:
 * it only records the shadow record and an event; it performs no execution.
 */
export declare function shadowEvaluate(productionFeatures: OrchestrationFeatureVector, shadowCandidateId: string | undefined, shadowPolicyId: string, shadowPolicyVersion: number, productionCandidateId: string | undefined, runId: string, reasonCodes?: string[]): ShadowDecision;
/** Record a shadow decision durably (still zero execution effects). */
export declare function recordShadowDecision(shadow: ShadowDecision): ShadowDecision;
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