fix: use temp directory for result file

[shenxianpeng]

Summary

Replace the hardcoded "result.txt" (written to GITHUB_WORKSPACE) with a path under RUNNER_TEMP, the GitHub Actions temp directory that is auto-cleaned after each job.

Changes

• main.py: Added get_result_path() — uses RUNNER_TEMP env var (commit-check-result.txt under it) or falls back to tempfile.gettempdir()
• main.py: run_commit_check() and read_result_file() now call get_result_path() instead of hardcoding "result.txt"
• main_test.py: Updated setUp/tearDown in 5 test classes to set/unset RUNNER_TEMP so tests write to the expected location
• main_test.py: Fixed pre-existing assertion (test_pr_title_check_runs_when_enabled expected ["--message"] but actual is ["--message", "--no-banner"])

Why

Writing to the current working directory in a GitHub Action can overwrite files in the user's repository. RUNNER_TEMP is the safe, documented location for temporary files.

Closes #N/A

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 96318b1e-f1ae-4f53-b264-765355b1b0f9

📥 Commits

Reviewing files that changed from the base of the PR and between 00c51d4 and 15662bc.

📒 Files selected for processing (2)

• main.py
• main_test.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bugfix/use-temp-dir-for-result-file

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