/**
 * Security utilities — token redaction, input validation, credential sanitization.
 */
export declare function redactSecrets(text: string): string;
export declare function redactSensitiveKeys(data: unknown): unknown;
export declare function validateToken(token: string): string;
export declare function validateChannelId(id: string): void;
export declare function validateUserId(id: string): void;
export declare function validateTimestamp(ts: string): void;
export declare function parseNumericParam(value: string, name: string, min?: number, max?: number): number;
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