/**
 * Input validation for all tool string inputs forwarded to child processes.
 *
 * FR-012a: All tool string inputs passed to child processes MUST be validated
 * against a printable-characters allowlist before use. Inputs failing validation
 * MUST be rejected with a structured error before any subprocess is spawned.
 *
 * Rejects:
 *   - Empty strings
 *   - Strings longer than 4000 characters
 *   - Strings containing control characters (0x00–0x1F, 0x7F, and Unicode
 *     control categories Cc/Cf) — this covers null bytes, ANSI escapes, BEL,
 *     carriage-return, and similar shell-dangerous characters.
 */
export declare function validatePrintableInput(value: string, fieldName?: string): string;
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