improve: 20 tasks, richer keywords, enhanced reward/grader, bigram matching, compelling README

fix: add run_episode wrapper, use .2f score format, update test for strict bounds

fix: clamp scores to strict (0,1) exclusive — validator requires no 0.0 or 1.0

fix: align score formatting decimals with strict hackathon template spec

fix: bulletproof inference.py with Docker + fallback connection methods

fix: correct inference log format, align openenv.yaml task IDs, harden Dockerfile

Build SQL Query Reviewer environment