Backend's runtime spawns the engine container outside the compose
project, so `docker compose down` left a `galaxy-game-…` container
running. Add a `stop-engines` target that finds them by their OCI
image-title label (set in game/Dockerfile) and remove forcibly;
make `down` and `clean` depend on it. `clean` additionally wipes
the per-game state directory under /tmp/galaxy-game-state.
Add a troubleshooting note for the related symptom: when the
browser holds a keypair from a previous DB and `make clean`
recreates everything, the lobby renders "no games yet" until the
user clears site data or opens an incognito window. The dev user
keeps the same email but receives a fresh user_id, which the old
keypair cannot authenticate against.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Ilia Denisov
82c4f70156