- Remove unused imports from nodes (time, torch, requests, itertools)
- Move uuid import to top-level in bot/bot.py
- Add 4 new test files with 86 tests for shared utilities
- Update CHANGELOG.md with version 2.0.0 refactoring summary
- Update REFACTOR_PRD.md to mark Phase 5 complete
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
