Add legacy data migration script and docs
- scripts/assign_legacy_sessions.py assigns user_id=NULL sessions,
  memory_facts, and memory_summary to a target user
  - Handles UNIQUE constraint conflicts in memory_facts by merging
  - Merges memory_summary if user already has one
- Update docs/auth.md with legacy migration section

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
1 parent dc14fe0 commit eb1b17fc10a9aa594df86516081fd48ab967bd90
@Eugene Sukhodolskiy Eugene Sukhodolskiy authored on 4 May
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docs/auth.md
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scripts/assign_legacy_sessions.py 0 → 100644