feat(environment): scaffold RedTeamEnvironment class with state fields

feat(config): add get_settings() with lru_cache for singleton pattern

feat(config): add LLM fields — hf_token, api_base_url, model_name, provider

feat(config): add Settings class extending pydantic BaseSettings

chore(server): add server package __init__.py

refactor(models): clean up imports and add module docstring

feat(models): add StepResult and ResetResponse models

feat(models): add EpisodeState model for GET /state response

feat(models): add RedTeamObservation model with all scoring fields

feat(models): add framing sanitizer validator to strip injection patterns

feat(models): add AttackAction model with intensity and framing fields

feat(models): add TargetCategory enum with 5 target categories

feat(models): add StrategyType enum with all 7 attack strategies

chore: add .gitignore for Python, env files and pycache

feat: add Dockerfile targeting port 7860 for HuggingFace Spaces

feat: add openenv.yaml with easy, medium and hard task configurations

chore: add requirements.txt with all pinned dependencies

docs: add initial README with project overview and HuggingFace Spaces frontmatter

chore: add .env.example with all required environment variables