Sync server/grader.py

Sync server/cleaning_engine.py

Sync server/data_wrangler_env_environment.py

Sync server/dataset_generator.py

Sync server/grader.py

Sync server/data_wrangler_env_environment.py

Sync server/grader.py

Sync server/data_wrangler_env_environment.py

Sync server/dataset_generator.py

Fix: defensive initialization in step() for stateless API

Fix: Call main() directly in __main__ block to pass openenv validator string check

Fix: Strict string check for __main__ block per automated evaluator

Fix: Flatten openenv layout to root, add uv.lock to resolve multi-mode deployment failures