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* ci: stop publishing -nightly bundle variants; release bundles on demand (#13206) Bundles (lfx-arxiv, lfx-duckduckgo) change infrequently enough that a nightly cadence is overkill. Drop the rename-to-`-nightly` and bundle publish lanes from the nightly pipeline and add a dedicated workflow_dispatch-only release_bundles.yml for purposeful releases. - nightly_build.yml: drop update_bundle_versions.py invocation and the src/bundles/*/pyproject.toml git-add guard. - release_nightly.yml: remove build-nightly-bundles and publish-nightly-bundles jobs; untether test-cross-platform and publish-nightly-main from them. - release_bundles.yml (new): build all src/bundles/* wheels, run a cross-OS install smoke test, then publish to PyPI under their stable names. Tolerates already-published versions so re-runs without a version bump are no-ops. release.yml still owns bundle publishing as part of main releases. Manual follow-up (PyPI admin): delete the lfx-arxiv-nightly and lfx-duckduckgo-nightly projects from PyPI. * ci(release_bundles): build lfx wheel locally for smoke test (#13207) The release_bundles.yml smoke test installs bundle wheels into a fresh venv, which makes uv resolve their `lfx>=X.Y,<Z` pin against PyPI. When bundles are released ahead of a matching lfx (typical case — bundles ship more often than lfx bumps land on PyPI), the resolve fails: Because only lfx<=0.4.3 is available and lfx-arxiv==0.1.0 depends on lfx>=0.5.0,<0.6.0, we can conclude that lfx-arxiv==0.1.0 cannot be used. Build the lfx wheel from the current ref in the build-bundles job and install it alongside the bundle wheels in the smoke test. The lfx wheel ships as a separate `dist-lfx-smoketest` artifact and is NOT included in the publish-bundles step — only the `dist-bundles` artifact gets pushed to PyPI. * ci(nightly): re-pin bundle lfx deps to lfx-nightly during nightly build (#13208) The nightly pipeline renames the workspace `lfx` package to `lfx-nightly` in `src/lfx/pyproject.toml` and the root workspace dep, but leaves each `src/bundles/*/pyproject.toml`'s `"lfx>=X.Y,<Z"` pin unchanged. With the workspace `lfx` gone and PyPI still on lfx 0.4.3, the create-nightly-tag job's `uv lock` fails: × No solution found when resolving dependencies for split [...] ╰─▶ Because only lfx<=0.4.3 is available and lfx-arxiv depends on lfx>=0.5.0,<0.6.0, we can conclude that lfx-arxiv's requirements are unsatisfiable. `update_lfx_version.py` now also rewrites the `lfx` (or already-rewritten `lfx-nightly`) specifier in every `src/bundles/*/pyproject.toml` to `lfx-nightly==<dev version>`, mirroring how `update_lf_base_dependency` re-pins the lfx dep inside `langflow-base`. The lookahead in the regex prevents matching sibling packages like `lfx-arxiv` / `lfx-duckduckgo`. No-op when no bundle pyprojects exist (e.g. on main today), so this is safe to merge ahead of the bundle extraction landing on main. Restored the guarded `git add src/bundles/*/pyproject.toml` step so the modified bundle pyprojects ride the same commit/tag as the rest of the nightly version bumps. Cherry-pick to release-1.10.0 to unblock nightlies cut from that branch.