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- webapp/: FastAPI dashboard to add/remove participants and exclusions, view draw history, and trigger the draw (reuses main.run_draw()). Optional HTTP basic auth via WEBAPP_USERNAME/WEBAPP_PASSWORD. - file_io.py: add add/remove_participant, add/remove_exclusion, load_year helpers backing the web GUI's CRUD actions. - Dockerfile + docker-compose.yml: containerize the web GUI, with CSV_PATH bind-mounted to a host folder so participant data persists outside the container. Verified with a local docker compose build/up smoke test. - README: document the web GUI, Docker usage, and the exclusions CSV file (existing feature that wasn't documented yet). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>