/**
 * lumiarq.auth — built-in authentication middleware.
 *
 * Validates a Bearer token from the `Authorization` header.
 * Stores the decoded payload on the request as `X-Auth-Payload` header
 * so downstream handlers can read it without re-parsing.
 *
 * Configuration is read from `process.env.LUMIARQ_AUTH_SECRET`.
 * In production, replace this stub with your full JWT/session logic.
 *
 * Usage in routes:
 * ```ts
 * Route.get('/dashboard', dashboardHandler, {
 *   middleware: ['lumiarq.auth'],
 * })
 * ```
 */
export declare const authMiddleware: import("../types.js").MiddlewareDefinition;
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