fix rx-shout integration test for new uv project structure

[masenf]

No description provided.

[greptile-apps]

Greptile Summary

This PR updates the rx-shout integration test job to work with the new uv-based pyproject.toml project structure (replacing the old requirements.txt flow), and removes the unconditional psutil dependency from wait_for_listening_port.py on non-Windows platforms.

• Integration test job: Instead of stripping a reflex== pin from requirements.txt and running uv pip install, the job now appends a [tool.uv.sources] override to pyproject.toml and calls uv sync --prerelease=allow, then uses uv run --project ... --no-sync to launch the integration script.
• _pid_exists helper: On Linux/macOS the function now uses the standard POSIX os.kill(pid, 0) pattern with ProcessLookupError/PermissionError handling, only falling back to psutil on Windows where os.kill accepts only CTRL_*_EVENT signals.

Confidence Score: 4/5

The workflow logic is sound but a stray tab character on line 190 of the YAML file could prevent the workflow from parsing correctly under a strict YAML parser.

The approach of patching pyproject.toml and using uv sync is correct for the new project structure, and the os.kill change in wait_for_listening_port.py is a clean POSIX improvement. The one concern is the tab-indented comment on line 190 of integration_tests.yml — it is invalid per the YAML spec, and if GitHub's parser ever tightens up or a pre-commit lint step runs, the entire workflow file would be rejected.

.github/workflows/integration_tests.yml — line 190 has a tab character where spaces are required by the YAML spec.

Important Files Changed

Filename	Overview
.github/workflows/integration_tests.yml	Rewrites the rx-shout integration job to use uv's pyproject.toml/sources model; one line has a tab character for indentation which is invalid YAML.
scripts/wait_for_listening_port.py	Replaces unconditional psutil usage with os.kill(pid, 0) on non-Windows, eliminating the psutil runtime dependency on Linux/macOS CI runners.

_{Reviews (2): Last reviewed commit: "remove long comment" | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing masenf/rx-shout-test (f7d442c) with main (2df5344)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[adhami3310]

@greptile