- Added schema_migrations table for explicit version tracking (CRITICAL fix)
- Refactored runMigrations() to use versioned migration objects
- Added hasMigrationBeenApplied() and recordMigration() helpers
- Migrations now skip already-applied versions and log progress
- Updated FUTURE.md with migration system issues and criticality ratings
- Updated Engineering_Reference_Manual.md with migration system docs
- Added DEVELOPMENT_LOG.md for agent work tracking
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