fix(search): BM25 0件時のセマンティックフォールバック (#178)#181
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…rid search When BM25 returns 0 results, RRF merge compressed semantic scores to ~0.016 (1/61), making hybrid search nearly useless for queries without keyword matches. This adds a fallback path in try_hybrid_search() that returns semantic results with their original cosine similarity scores when BM25 is empty, consistent with the existing fallback in suggest.rs. Closes #178 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Closes #178
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