docs-mcp-server

# Tasks 1. **Update Configuration Schema** - Modify `src/utils/config.ts` to add `assembly.maxChunkDistance` (default: 3). - Update `AppConfig` type definition if necessary (Zod inference should handle it). - <!-- Validation: Run `npm run typecheck` --> 2. **Implement Chunk Clustering Logic** - Modify `src/store/DocumentRetrieverService.ts`. - Add private method `clusterChunksByDistance(chunks: DbPageChunk[]): DbPageChunk[][]`. - Update `search` method to apply clustering after grouping by URL but before `processUrlGroup`. - Iterate over *clusters* instead of URL groups to call `processUrlGroup`. - Collect all results and perform a final sort by score. - <!-- Validation: Unit tests in Task 3 --> 3. **Add Unit Tests** - Update `src/store/DocumentRetrieverService.test.ts`. - Add test case: `should split distant chunks into separate results`. - Add test case: `should merge close chunks`. - Add test case: `should maintain score sorting across split results`. - <!-- Validation: Run `npm test src/store/DocumentRetrieverService.test.ts` -->