SQLite FTS5 bm25() returns negative values where numerically smaller
(more negative) indicates a better match. The official docs state:
"The better the match, the numerically smaller the value returned."
Two comments incorrectly stated "closer to 0 = better match" and
"lower = better match". Updated all rank descriptions to use the
unambiguous "more negative = higher relevance" phrasing.
This matters because these comments are used as tool prompt hints
for LLM agents, and incorrect semantics could lead to wrong ranking
decisions.
Liu Yuan
f0e6b7aa37