Note

Prevent underflow in BM25STD IDF calculation and add a targeted test; adjust test skips and remove an obsolete scorer test.

• Scoring (BM25STD):
  • Clamp totalDocs in CalculateIDF_BM25 to MAX(totalDocs, termDocs) to avoid underflow in IDF (src/iterators/inverted_index_iterator.c).
• Tests:
  • Add testBM25STDUnderflow to validate stable BM25STD scoring under stale inverted-index entries (tests/pytests/test_scorers.py).
  • Remove testScoreReplace from tests/pytests/test_scorers.py.
  • Update skip conditions for testLazyTextFieldExpiration to also skip in cluster mode (tests/pytests/test_expire.py).

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