Update README.md

Update README.md

fix: correct W&B metrics in README

sync: hf-space is now the single source of truth

fix: STAGE_FILES points stages 2-3 to actual app files + update reward_curve (LFS) + results table

feat: GRPO training, fixed curriculum stages 2+3, AST verifier, leaderboard UI, openenv schema

docs: clarify inference eval vs GRPO training

fix: clarify Y-axis raw vs normalized reward

fix: png rename + remove placeholder + fix blog link + add baseline comparison

docs: real results + reward curve + W&B link

docs: add W&B link and results

docs: complete README with full project description

readme: fix yaml header no emoji

readme: fix HF Space yaml header

readme: add HF Space yaml metadata header

initial deploy — jairaj files, teammate files pending

initial commit