refactor(ltm): redesign long-term memory with context compaction (reopen of #8144)#8226

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RC-CHN:refactor-ltm

Commits on May 19, 2026

refactor(ltm): redesign long-term memory with context compaction
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fix(ltm): handle malformed JSON in tool args and clean up lock on session removal
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fix(ltm): guard against duplicate system prompt note injection
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fix(ltm): fall back to user message when internal marker parsing fails
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fix(ltm): release session lock during LLM summary generation
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fix(ltm): trim raw_records in handle_message to prevent unbounded growth
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perf(ltm): use len(s) instead of len(s.encode()) in trim loop
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feat(ltm): make user segment truncation limits configurable
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feat(ltm): pre-fill default LTM summary prompt in config and i18n
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