/**
 * Plugin-only fallback for extracting source paths from a synthesized recall response.
 *
 * Used when the brv CLI does not surface `matchedDocs` in the
 * `brv query --format json` envelope. All five resolution tiers in the CLI emit a
 * `**Sources**:` block in the synthesized content (the format is locked in by the
 * synthesis prompt's `responseFormat` rules and grounding rules), so we can recover paths
 * by parsing the content. When the CLI is current we use `matchedDocs` directly and skip
 * this parser entirely.
 *
 * Returns an empty array on any of:
 * - No `**Sources**:` block at all
 * - `**Sources**: None` (Tier 2 not-found)
 * - Block exists but contains no extractable list items
 */
export declare function parseSourcesFromContent(content: string): string[];