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* feat(memory): add deterministic near-duplicate fact gate Add an opt-in write-side gate for DeerMem (issue #5252): a proposed NEW fact whose bounded token-Jaccard similarity to an existing fact in the same user/agent scope AND category reaches fact_dedup_similarity_threshold merges into that fact instead of being appended — the existing id/content/createdAt are kept, confidence is raised to the maximum, and the source is refreshed, with one facts_merged_dedup metric increment recording the merge. Defaults preserve the legacy behavior exactly; targeted updates by fact id and the exact-content key check are untouched. Companion write-side step to the read-side relevance/diversity work in #5251. Refs #5252 Signed-off-by: pwd11 <fvdsrc@163.com> * fix(memory): preserve corrections during fact deduplication Signed-off-by: pwd11 <fvdsrc@163.com> --------- Signed-off-by: pwd11 <fvdsrc@163.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>