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1cf2bb4c16
fix(ci): scope nightly migration-test pre-releases to the langflow stack The previous fix (#13599) added a global --prerelease=allow, which let UNRELATED dependencies resolve to alphas: on nightly run 27274206250 the stable->nightly upgrade pulled pydantic 2.14.0a1 + pydantic-yaml 1.6.1a1, and the pydantic alpha breaks langchain-core at import time (RunnablePassthrough pydantic ValidationError), failing the nightly boot right after a successful install. Clean installs were fine - only this upgrade path resolved the alpha combo. Scope pre-release eligibility to the langflow lockstep stack instead: uv accepts a pre-release when the package's own requirement carries a pre-release marker, but not via transitive pins, and the nightly chain is langflow -> langflow-base -> lfx -> langflow-sdk with exact ==devN pins. Request each directly; langflow-sdk versions independently (0.2.0.devN), so an explicit .dev0 floor marks it eligible while lfx's exact pin selects the version. The 'latest' branch gets the same treatment via .dev0 floors on all four. Verified by dry-run against PyPI: langflow/langflow-base/lfx at 1.11.0.dev2 + langflow-sdk 0.2.0.dev2 resolve with pydantic staying at stable 2.13.4.