fix(#182): BM25 搜索用 pagerank 打破二元分数#193
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- search / fallback_search: final_score = bm25 * (1 + pagerank * 10)，保留 4 位小数 - 保存 _pageranks 数组供打分时使用 - 解决短 query（如 "websocket handler"）只有 0.5/1.0 两档分数的问题 - 2 个回归测试：pagerank tiebreaker + 中等 corpus 至少 3 个不同分数 closes #182
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Related Issue
closes #182
Changes
src/search.py: final_score = bm25 * (1 + pagerank * 10)，保留 4 位小数tests/test_issue_182.py: 2 个回归测试Verification