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Stage 1 of the dev-as-prod-mirror rework. The auto-provisioned "Dev Sandbox" game and dummy users are removed so the dev contour starts empty like prod; the separate legacy-report loader stays as the test-data path. - delete backend/internal/devsandbox (package + tests) - drop the bootstrap call + DevSandboxConfig (struct, Config field, BACKEND_DEV_SANDBOX_* env, defaults, loader, validation) - strip BACKEND_DEV_SANDBOX_* from dev-deploy + local-dev compose and .env.example; the generic engine-recycle / prune-broken-engines logic stays (it serves real games) - update tooling docs (dev-deploy README + KNOWN-ISSUES, local-dev README + Makefile) and stale comments; DeleteGame and InsertMembershipDirect remain (exercised by lobby integration tests) No app behaviour change beyond not auto-creating the sandbox game.