Feat/50 add has tests field

[harshita-g]

Summary

Adds a has_tests boolean to repository analysis so PathReview can report whether a repository contains automated tests.

Changes

• Added test detection to RepoAnalyzer
• Added has_tests to the parser metadata
• Added Has Tests to the generated repository summary
• Detects tests/ and test/ directories
• Detects pytest.ini
• Detects Python files matching test_*.py
• Detects __tests__ and spec/
• Prevents false positives such as test_notes.md
• Added six unit tests covering positive, negative, and edge-case behavior

Testing

python -m pytest tests/unit/test_repo_analyzer.py -v

Result:

6 passed

Full test suite:

381 passed, 53 failed, 2 warnings

The remaining failures occur in unrelated modules and do not involve RepoAnalyzer or the has_tests change.

Related issue

Closes #50