/**
 * Strips markdown syntax from a string and returns plain text.
 *
 * Used by SummariserService to guarantee that the `tldr` returned from the LLM
 * is plain text regardless of whether the model emits markdown formatting.
 *
 * Transformation pipeline (order matters — see spec for rationale):
 *   1. Unwrap markdown images:  ![alt](url) -> alt
 *   2. Unwrap markdown links:   [text](url) -> text
 *   3. Strip line-leading block markers (#, -, *, +, >, 1.) at line starts
 *   4. Remove horizontal-rule lines entirely
 *   5. Strip inline emphasis markers: **, __, ~~, *, _, `
 *   6. Collapse any run of whitespace (including newlines) to a single space, then trim
 *
 * Idempotent: sanitizeTldr(sanitizeTldr(x)) === sanitizeTldr(x).
 */
export declare const sanitizeTldr: (input: string) => string;
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