Major improvements across 7 areas:
- Add centralized Config singleton (config.py) replacing ~176 config
reloads per session with a single cached load
- Add logging framework (log.py) with RotatingFileHandler, replacing
silent except Exception: pass blocks with structured logging
- Refactor menu system (menu.py) with data-driven color selection,
eliminating ~1,370 lines of duplicate menu functions
- Create shared/ modules extracting 7 utility functions duplicated
between PyBlock.py and SPV/spvblock.py
- Clean dependencies: pin all versions, remove stdlib packages
(asyncio, threading), remove unused imports
- Improve Docker: pin ubuntu:24.04, add non-root user, use venv
- Improve CI: update to actions v4/v5, add test job before publish
- Fix entry point: wrap main loop in def main(), proper module import
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
