/**
 * Escape special XML characters in a string.
 *
 * Pure logic — no I/O, no side effects.
 *
 * Used by prompt injection to safely embed user/principle text into XML-style
 * prompt markers (e.g. `<directive id="...">...</directive>`). Also accepted
 * as a callback by `trimToBudget` and `renderPrinciplesToDirectives` in
 * `runtime-v2/activation/prompt-activation-reader-contract.ts`.
 */
export declare function escapeXml(input: string): string;
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