/**
 * Per-bot session-backend override persistence. Mirrors sandbox-store:
 * cross-process file lock + atomic bots.json write + in-memory registry sync,
 * so the daemon picks up the change WITHOUT a restart.
 *
 * Live-safe by construction: only the NEXT session spawn reads the new
 * `botCfg.backendType` (forkWorker resolves `botCfg.backendType ?? default`).
 * Already-running sessions keep the backend stamped on `Session.backendType`
 * at spawn time — `getSessionPersistentBackendType` prefers that stamp over
 * live config and never falls back to the current default — so an operator
 * flipping herdr↔tmux here can't strand or zombie-close existing sessions.
 *
 * `null` clears the override → the bot falls back to `config.daemon.backendType`
 * (auto-detected default).
 */
import type { BackendType } from '../adapters/backend/types.js';
/** Backends an operator may pick from in the dashboard. */
export declare const EDITABLE_BACKEND_TYPES: readonly BackendType[];
export declare function isEditableBackendType(v: unknown): v is BackendType;
/** Current per-bot backend override (undefined = follow the daemon default). */
export declare function getBotBackendType(larkAppId: string): BackendType | undefined;
/**
 * Persist a per-bot backend override. Pass `null` to clear it (auto-detect).
 * Never touches running sessions — takes effect on the next spawn / restart.
 */
export declare function updateBotBackendType(larkAppId: string, backendType: BackendType | null): Promise<{
    ok: true;
    backendType: BackendType | null;
} | {
    ok: false;
    reason: string;
}>;
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