/**
 * Explicit lame-duck shutdown state for the renderer.
 *
 * This is intentionally separate from the `serverInitialized` health flag,
 * which is also `false` during startup. Once SIGTERM is received the renderer
 * enters lame-duck mode: new agent-work requests are rejected with 503 so the
 * API gets a clean pre-side-effect failure it can retry against another
 * instance, while in-flight streams continue draining.
 */
/** Marks the server as entering graceful shutdown (lame-duck mode). */
export declare function markServerShuttingDown(): void;
/** Returns true once the server has started graceful shutdown. */
export declare function isServerShuttingDown(): boolean;
/** Test-only helper to reset lame-duck state between tests. */
export declare function __resetServerShuttingDownForTests(): void;
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