Strengthen grader and rebalance tasks based on review feedback

Match exact [START]/[STEP]/[END] hackathon output spec

Make inference.py compliant with hackathon output spec

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

Fix OpenEnv validator: add uv.lock, server entry point, openenv-core dep

Restore HF Spaces README frontmatter

Add OpenEnv spec_version 1 format, server/app.py, pyproject.toml for validator

update README.md

Add openenv.yaml to repo root for validator

Make reset body optional for OpenEnv validator

Fix Dockerfile: add non-root user for HF Spaces

Add app_port and slim dependencies for HF Spaces

Email Triage OpenEnv environment

initial commit