Refactor: Restore intrinsic detector to fallback logic, rewrite README.md, and polish all codebase comments for final submission

Restore 500 steps, LLM every step with circuit breaker, use requests.Session for speed

Decrease MAX_STEPS to 250 and change LLM frame skip to 10

Update: Sync all modules, add detector/tests/validation, fix inference agent logic

Fix PLL simulation issues and improve observation handling

Initial commit: PLL Cyberattack Detection OpenEnv