Code review found three issues where transaction.go diverged from the
main dependencies.go implementation:
1. Add relates-to exemption from cycle detection - bidirectional
relationships are valid and should not trigger cycle errors
2. Add metadata and thread_id fields to INSERT - required for
replies-to threading to work in transaction context
3. Update error message to match dependencies.go wording
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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