- Added 'Upgrading from Older Versions' section with full step-by-step
- Added version history table (v1.0 - v1.4)
- Added upgrade paths for curl download and git pull
- Added backfill instructions and verification steps
- Added upgrade section to install.sh
- Added backfill_memory.py script
- Fixed missing 'ids' field in POST body causing 400 errors
- Backfilled 23 memory files (Feb 4 - Mar 1, 2026)
- Validation: ~20K+ total points, date coverage complete
Resolves Gitea issue #8
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