Add grader_discovery module for explicit validator support

refactor: revert to root-level package structure with proper imports and hacky pyproject.toml setup

refactor: proper package structure - move he_demo package to dedicated folder

feat: comprehensive LLM inference evaluation and validation

feat: add explicit task registry and validation endpoints

Fix Phase 2 validation: Add missing graders for advanced_efficiency and expert_optimization tasks

Fix: Make task graders explicitly discoverable with proper metadata and endpoints

Add complete Energy & Memory RAM Optimization RL Environment