Add root endpoint to fix GET / 404

Add line numbers to code display, fix clear_flag loop, match submission spec exactly

Fix stdout to [START]/[STEP]/[END] format, use OpenAI client with HF defaults

Add GRPO batch endpoint, task replay in curriculum, update to v2.1.0

Add diversity/exploration bonuses, near-miss type check, context truncation

Add 7-task RL env with PBRS, CAMRL curriculum, VL norm, RC-GRPO inference

Accept OPENAI_API_KEY as fallback for HF_TOKEN

Fix project.scripts entry point name

Code Review Environment OpenEnv hackathon submission