feat: improve title generation for .github and non-conventional commits

[dclong]

Summary

• feat(pr_content): improve title generation for .github and non-conventional commits

Changed files

Modified

• github_rest_api/pr_content.py (+18/-7)
• tests/test_pr_content.py (+48/-0)

Commits

• 89b62cd feat(pr_content): improve title generation for .github and non-conventional commits

[gemini-code-assist]

Code Review

This pull request refactors the deterministic_title function to improve PR title generation. It falls back to the first commit's subject line instead of a generic placeholder when no conventional commits are present, and maps changes confined to the .github directory to the ci type while dropping the redundant scope. It also adds corresponding unit tests. The reviewer suggested a code improvement to consistently strip the redundant .github scope when the resolved type is ci, even if the type was explicitly specified in a conventional commit.

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