fix: register session-aware routes before openenv-core to prevent duplicate route shadowing

fix: session-aware HTTP endpoints — env state persists across reset/step calls

fix: HF_TOKEN = os.getenv('HF_TOKEN') matches checklist exactly

fix: HF_TOKEN must have no default per submission checklist

fix: remove em dash from server/app.py docstring

chore: add .gitignore

fix: openenv validate passes, strict grader scores, /grader+/tasks endpoints, server/app.py main(), uv.lock

fix: add requests to requirements.txt for inference.py HTTP calls

fix: [START]/[STEP]/[END] log format + HTTP mode for validator

fix: auto-init env on step() for HTTP stateless mode

Add HF Space metadata header

Initial implementation - all core files