/**
 * Read a wallet's .env file and apply to process.env.
 * Overwrites existing values (unlike startup which preserves).
 */
export declare function loadWalletEnv(walletDir: string): void;
/**
 * Ensure private keys are available (EVM and/or Solana).
 * If not in process.env after .env load, try OS keychain.
 */
export declare function ensurePrivateKey(walletName: string): Promise<void>;
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