Read API vars fresh in main(), add stderr debug logging

Fix API key priority in eval.py to match inference.py

Fix API key priority: use API_KEY before HF_TOKEN

Rewrite inference.py to use OpenEnv client and BENCHMARK_URL

Add [START]/[STEP]/[END] structured output to inference.py

Add real benchmark results from model comparison experiment

Improve inference strategy: filter flagged columns, cap plan size

Add top-3 differentiators: seed variation, TRL training, benchmarking

Fix all code review findings (5 issues)

Transform to competition-grade submission

Restructure repo to match OpenEnv standard layout

Fix critical issues from code review

Improve inference agent for better scores

Fix stateful HTTP endpoints and add HF Spaces deployment config

Add inference script, Dockerfile, config, and README

Initial commit: DataCleanEnv core environment

initial commit