yangluxin613 fd571ac539 fix(memory): address PR review — numpy/UPSERT soft deps + BM25 floor + BLOB dim ...

- numpy soft dependency: try/except import + _HAS_NUMPY flag; _encode_embedding
  and _decode_embedding fall back to struct.pack/unpack; search_vector falls back
  to pure-Python cosine loop — startup never fails without numpy reinstalled
- SQLite UPSERT guard: _HAS_UPSERT = sqlite_version_info >= (3,24,0); save_chunk
  and save_chunks_batch fall back to INSERT OR REPLACE on SQLite < 3.24 with a
  one-time startup warning about potential FTS rowid drift
- _bm25_rank_to_score floor: 0.3 + 0.69*(|rank|/(1+|rank|)) → always in [0.3, 0.99),
  prevents small-corpus matches scoring 0.0 and being filtered by min_score
- detect_index_dim BLOB-aware: check isinstance(raw, bytes) first and return
  len(raw)//4 before json.loads, so /memory status works after embedding format switch
- Comment: "CJK single-char" → "CJK tokens shorter than 3 characters"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-25 14:15:16 +08:00

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