openenv

Fix: Align root endpoint JSON metadata strictly with OpenEnv standards and openenv.yaml

Fix: Rewrite inference.py to use WebSocket (stateful) instead of HTTP (stateless). HTTP created a fresh env per step so graders were never invoked and scores were always exactly 0.5. WebSocket maintains session state so real graded scores (0.01-0.99) are produced.

Fix inference.py: corrected the HTTP step payload format, fixed done logic, and improved robustness

Replace redirect with hardcoded metadata json

Redirect root route to metadata endpoint