Greptile Summary

This PR simplifies PYTHONPATH construction in the env-escape client by assigning env["PYTHONPATH"] = pythonpath directly instead of merging with a saved MF_ORIG_PYTHONPATH, and bumps test dependency versions for numpy and scikit-learn.

• client.py: Removes the multi-part os.pathsep.join logic that combined the pythonpath argument with a saved MF_ORIG_PYTHONPATH value; the pythonpath argument is now used as-is, meaning callers are expected to already include any original path components before passing to Client.
• complex_dag_flow.py: Updates conda library pins — numpy 2.1.1 → 2.2.0 and scikit-learn 1.3.0 → 1.5.0 — in the spin test flow.

Confidence Score: 4/5

The core logic change in client.py is straightforward, but the removal of env.pop("MF_ORIG_PYTHONPATH", "") (flagged in an existing review thread) means that variable is now forwarded unstripped to the server subprocess.

The PYTHONPATH simplification itself is clean, but the existing thread on MF_ORIG_PYTHONPATH leaking into the server's environment is an unresolved concern that warrants attention before merging. The test dependency bumps are safe.

metaflow/plugins/env_escape/client.py — specifically around the env variable cleanup logic for MF_ORIG_PYTHONPATH.

Important Files Changed

_{Reviews (3): Last reviewed commit: "Re-add PYTHONPATH setting" | Re-trigger Greptile}