- Add migrations.py with create_migration, run_migrations, get_db_version
- Implement CLI migrate and create-migration commands
- Use FastMigrate's sequential 0001-*.sql naming convention
- Add comprehensive unit, integration, and E2E tests (35 tests)
- Add fresh_db_path and temp_migrations_dir test fixtures
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
