Add functionality to group search results with similar content and scores
into a single representative result with additional locations.
Changes:
- Add AdditionalLocation entity model for storing grouped result locations
- Add additional_locations field to SearchResult for backward compatibility
- Implement group_similar_results() function in ranking.py with:
- Content-based grouping (by excerpt or content field)
- Score-based sub-grouping with configurable threshold
- Metadata preservation with grouped_count tracking
- Add group_results and grouping_threshold options to SearchOptions
- Integrate grouping into ChainSearchEngine.search() after RRF fusion
Test coverage:
- 36 multi-level tests covering unit, boundary, integration, and performance
- Real-world scenario tests for RRF scores and duplicate code detection
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>