- Updated root README with current architecture (dual PostgreSQL, Redis, MTGJSON pipeline)
- Created backend/README.md with detailed architecture, database setup, and troubleshooting
- Updated state.json to reflect completed documentation phase
- Changed REQUIRED_FILES to REQUIRED_JSON_FILES and REQUIRED_ZIP_FILES
- AllSetFiles.zip kept as zip (only available compressed on MTGJSON)
- All other files downloaded as .json (no compression)
- Removed gzip import and unpacking logic for .gz files
- Updated EXPECTED_MIN_SIZES to reflect actual .json file sizes
- Removed validation for non-existent files