- Dedup union candidates by (full_path, chunk_index), not basename —
two files sharing a basename in different dirs no longer collide,
and a vector hit on chunk N of a file no longer blocks BM25 from
contributing chunk M of the same file.
- Validate candidate_strategy at the top of search_memories so invalid
values fail consistently, not only when the call routes through the
vector path.
- Trim hits back to n_results after the union+rerank pool grows;
preserves the existing search_memories size contract that the MCP
limit parameter is built on.
- Skip BM25-only injection when max_distance > 0.0; BM25-only
candidates carry distance=None and would silently bypass the
caller's strict vector-distance threshold.
Adds 4 tests covering: validation under vector_disabled, n_results
trim, max_distance honoring, and basename-collision dedup.
Igor Lins e Silva
3eb7980e55