v0.1.0 - MVP

One person can host a real CTF for ~100 participants on a single server:
git clone && docker compose up yields auth, teams, a challenge board with
seeded examples, flag submission with scoring, a live scoreboard, and an admin
panel — no cloud account, no license key.

Highlights: email/password auth (argon2id, revocable Redis sessions); teams;
event window + freeze; standard/container challenges with attachments; static +
dynamic scoring; rate-limited logged submissions; live WebSocket scoreboard;
Docker challenge runtime; full admin panel; embedded React SPA; 8 seeded example
challenges; one-command compose deploy; /healthz, /readyz, Prometheus metrics.

Licensed under Apache-2.0. See CHANGELOG.md for details.
No API stability promises before v1.0.