fix: resolve empty MCP semantic search results#2
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- Fix LanceDB path mismatch between init and search phases. Init stored vectors at project_index_dir/.lancedb/ while Search expected them at lancedb_dir/.lancedb/, causing all vector queries to return empty results. - Create BM25 index during init phase. Previously bm25_index was passed as None to EmbeddingService, so sparse retrieval channel was always empty. - Capture stderr in MCP server run_cli instead of discarding it, making search errors visible for debugging.
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Fix LanceDB path mismatch between init and search phases. Init stored vectors at project_index_dir/.lancedb/ while Search expected them at lancedb_dir/.lancedb/, causing all vector queries to return empty results.
Create BM25 index during init phase. Previously bm25_index was passed as None to EmbeddingService, so sparse retrieval channel was always empty.
Capture stderr in MCP server run_cli instead of discarding it, making search errors visible for debugging.