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0555eeced1
Integration tests failed twice in nightly run 27260425158 with pyleak EventLoopBlockError - first Integration Tests 3.14, then 3.12 on the rerun, each time in a different test. The blocking stack points at refresh_models_dev_periodically: every app boot unconditionally starts a lifespan task that immediately fetches https://models.dev/api.json, so the request lands mid-test in whatever test happens to be running. Under pyleak's asyncio debug instrumentation the fetch blocked the loop 0.797s against a 0.2s threshold. Whichever test draws the short straw flakes - which is why it looked transient and moved between versions. Add a LANGFLOW_MODELS_DEV_REFRESH env gate (default unchanged: enabled) and disable it session-wide in the backend test conftest. Tests fall back to the bundled static model lists, which is also deterministic. Verified: with the gate set, app boot makes zero models.dev requests; the previously failing integration test passes.