Fix rust coverage exit handling

[leynos]

Summary

• fix cargo invocation to propagate error codes

Testing

• make lint
• make test

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https://chatgpt.com/codex/tasks/task_e_688b5319574c8322a11b30739b5d4b31

Summary by Sourcery

Fix Rust coverage script to correctly propagate Cargo exit codes by extracting the read_previous helper out of the _run_cargo function.

Bug Fixes:

• Ensure _run_cargo returns Cargo's error code instead of swallowing failures

Enhancements:

• Relocate the read_previous helper to avoid being nested inside _run_cargo

[sourcery-ai]

Reviewer's Guide

This change enhances the Cargo invocation helper to correctly propagate non-zero exit codes and cleans up the script by moving the read_previous helper into a more logical position.

File-Level Changes

Change	Details	Files
Propagate non-zero exit codes in the Cargo runner	Capture and test the subprocess return code Echo a failure message with the exit code Raise a typer.Exit(retcode) to propagate the error	.github/actions/generate-coverage/scripts/run_rust.py
Reposition the read_previous helper function	Remove the earlier definition of read_previous Re-add read_previous after the Cargo invocation logic for better grouping	.github/actions/generate-coverage/scripts/run_rust.py

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[sourcery-ai]

Hey @leynos - I've reviewed your changes and they look great!

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