🤖 perf: rotate sealed chat history out of chat.jsonl at compaction boundaries#3541

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Commits on Jun 12, 2026

feat: rotate sealed chat history into chat-archive.jsonl at compaction boundaries
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tests: update planCommands boundary test for sealed-history rotation
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fix: address Codex review — archive-aware analytics ETL + truncation sequence floor
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fix: no-op percentage truncation must not collapse the archive
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fix: archive floor for deleteMessage counter; archive-aware live subagent transcripts
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fix: archive floor when renaming archive-only sessions
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fix: keep analytics for archive-only sessions
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fix: reingest analytics on combined-mtime regression (active file removed)
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fix: presence-aware analytics watermark change signal
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