feat: implement Unsloth GRPO training script with diverse reward functions and logging

fix: update training script with seed variation, fix reward normalization, regenerate training curves showing 0.52->0.67 improvement

feat: add scripts/full_demo.py — unified 10-step demo proving all 4 hackathon themes operational

fix: training reward uses 8-step rollout + /grade for genuine episode-level signal

feat: commit training evidence, update README with real scores, add demo scripts

feat: add baseline evaluation tools and demo scripts for RL performance comparison

feat: add GridMind GRPO training notebook using Unsloth and HF TRL

Add Task 4 instruction following, Curriculum Manager for self-improvement, and world modeling simulation

Add GridMind GRPO training notebook for Colab

feat: add OpenEnv submission validator script to check HF Space status and Docker build