* fix(memory): drop punctuation tokens from jieba relevance ranking
jieba.cut emits punctuation as standalone tokens and tokenize() only filtered whitespace, so commas and full stops counted as query matches, inflated near-duplicate similarity, and consumed the 128-token budget. Keep only tokens with an alphanumeric character, matching the regex fallback and the FTS5 adapter's query filter.
Document the rule in agents/memory/AGENTS.md.
* docs(changelog): add the DeerMem jieba punctuation fix
* docs(changelog): add the PR reference for the jieba punctuation fix (#6388)
* docs(memory): document jieba relevance token filtering
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>