Bump versions, add security middleware & deps

feat: finalize CodeLens. production suite (Docker, CI/CD, Documentation)

feat: finalize CodeLens. rebranding and production environment polish

test: expand test suite to 150+ tests and 80%+ coverage

feat: add SQLite persistence for episodes, results, and leaderboard via SQLModel

Revert "feat: add API hardening, rate limiting, and resource management"

feat: harden API with rate limiting, optional API-key auth, episode TTL, and pagination

chore: fix TestClient compatibility in requirements.txt

feat: OpenEnv spec compliance + blast radius enrichment (0→10)

Add requirements.txt