[codex] add flmexec Runner numpy e2e

[k82cn]

Summary

• Add a focused e2e test for the flmexec Python service path.
• Have the flmexec script start Runner with dependencies=["numpy"].
• Assert the remote Runner function imports numpy and returns a deterministic result.

Validation

• python3 -m py_compile e2e/tests/test_flmexec.py
• cd e2e && uv run --extra dev ruff format --check tests/test_flmexec.py
• cd e2e && uv run --extra dev ruff check tests/test_flmexec.py
• cd e2e && uv run --extra dev pytest -vv tests/test_flmexec.py (skipped locally without a running Flame cluster)

Full Docker e2e was not run because flame-console is not running locally.

[gemini-code-assist]

Code Review

This pull request introduces a new end-to-end test file e2e/tests/test_flmexec.py to verify that a Python script executed via flmexec can successfully start a runner with a numpy dependency and retrieve correct results. There are no review comments to address.

[codecov]

Codecov Report

❌ Patch coverage is 87.71930% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
flmexec/src/script/lang/python.rs	87.71%	7 Missing ⚠️

📢 Thoughts on this report? Let us know!