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- backend/tests/conftest.py: pytest_configure brings up an ephemeral Postgres via docker compose + runs migrations when DATABASE_URL isn't already reachable, and tears it down after. `cd backend && pytest` now works from a clean checkout with zero manual setup (72 passed in ~28s); no docker and no DB -> the whole suite skips with a clear message instead of erroring 60+ times. - scripts/verify_fresh_clone.sh: exports a pristine tree (git archive, so no .godot), imports from scratch, headless-boots the main menu + game scene, fails on any SCRIPT ERROR / failed autoload. Catches the stale-class-cache class of bug. PASS. - run_checkpoint_tests.py runs both the 2p multiplayer test and the fresh-clone check. - .forgejo/workflows/checkpoint.yml + docs/ci.md: the CI workflow (runs the checkpoint suite on push/PR) and how to enable it -- it needs a Forgejo Actions `host` runner registered on the AGP box, a one-time operator step. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015jtxAiu5dAW4WxCNdGkrkJ