chore: improve ComfyUI maintenance path

[lphuc2250gma]

Summary:

• Add or tighten focused edge-case tests or type assertions in tests/conftest.py, tests/compare/conftest.py related to Python typing, tests, CLI ergonomics, observability; avoid docs-only changes and broad refactors.
• Keep the change narrow so it is straightforward to review.

Notes:

• I kept this scoped to the relevant implementation and tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 53eba22 and ccc841a.

📒 Files selected for processing (2)

• tests-unit/compare_test/conftest_test.py
• tests/compare/conftest.py

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📝 Walkthrough

Walkthrough

This PR refactors gather_file_basenames in tests/compare/conftest.py to add type safety and stricter error handling. The function now explicitly declares parameter and return types, asserts that input is a string, returns an empty list for missing directories, and filters results to .png files via list comprehension. A new test module introduces comprehensive coverage with three test cases validating .png filtering, missing-directory behavior, and type-validation errors.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'chore: improve ComfyUI maintenance path' is vague and does not clearly describe the specific changes made in this PR.	Consider a more specific title that describes the actual changes, such as 'test: add unit tests and type hints for gather_file_basenames' or 'chore: add type hints and edge-case tests for conftest utilities'.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is related to the changeset, explaining that focused edge-case tests and type assertions are being added to conftest files, which aligns with the actual changes shown.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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