/**
 * Durable, content-addressed storage for routing policies, evidence, decisions,
 * shadow decisions, events and drift samples.
 *
 * Storage lives under `<agentDir>/routing/`. All writes are atomic
 * (write-temp-then-rename), read snapshots are cached but never authoritative,
 * and the active-policy pointer is swapped atomically with an immutable old
 * policy retained for rollback.
 */
import type { CandidateEvidence, OrchestrationDecision, OrchestrationEvent, RoutingPolicyCandidate, ShadowDecision } from "./types.js";
/** SHA-256 hex digest. */
export declare function sha256(input: string): string;
/** Deterministic stable JSON serialization (sorted keys). */
export declare function stableStringify(value: unknown): string;
export interface ActivePolicyPointer {
    policyId: string;
    policyVersion: number;
    hash: string;
    activatedAt: string;
    previousPolicyId?: string;
}
export declare function loadActivePolicyPointer(): ActivePolicyPointer | undefined;
export declare function saveActivePolicyPointer(pointer: ActivePolicyPointer): void;
export declare function writePolicy(policy: RoutingPolicyCandidate): string;
export declare function readPolicy(policyId: string): RoutingPolicyCandidate | undefined;
export declare function listPolicies(): RoutingPolicyCandidate[];
export declare function deletePolicy(policyId: string): void;
export declare function writeDecision(decision: OrchestrationDecision): string;
export declare function readDecision(decisionId: string): OrchestrationDecision | undefined;
export declare function listDecisions(limit: number): OrchestrationDecision[];
export declare function writeEvidence(evidence: CandidateEvidence): string;
export declare function readEvidence(candidateId: string): CandidateEvidence | undefined;
export declare function writeShadowDecision(shadow: ShadowDecision): string;
export declare function listShadowDecisions(limit: number): ShadowDecision[];
/** Append an event to the current run's event log (bounded). Returns the event. */
export declare function appendEvent(event: Omit<OrchestrationEvent, "eventId" | "sequence" | "occurredAt">): OrchestrationEvent;
export declare function listEvents(limit: number): OrchestrationEvent[];
export declare function appendDriftSample(dimension: string, value: number): void;
export declare function readDriftSamples(dimension: string): {
    t: number;
    v: number;
}[];
export interface RegistrySnapshot {
    agents: {
        name: string;
        role: string;
        model: string;
        provider: string;
    }[];
    retrievalPolicies: string[];
    budgetClasses: string[];
}
/** Scan the canonical subagent registry files. Never authoritative; used only for candidate generation. */
export declare function scanSubagentRegistry(): RegistrySnapshot;
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