chore: expand test suite and remove comments from existing tests

[Huerte]

Type

• Bug fix
• New feature
• Documentation
• Refactor / internal

Changes

• Fixed target directory lock issues on Windows inside gitgo init on scaffolding failures by returning to the original directory before cleanup.
• Refactored the test suite to remove comments/docstrings from assertions.
• Added new test modules test_banner.py and test_colors.py.
• Significantly expanded test suite coverage (93% total code coverage) across all core command and utility modules, covering edge cases, interrupts, and exception handling paths.

Checklist

• Tested locally and changes work as expected
• CHANGELOG.md updated under [Unreleased]
• README.md updated (if a command was added or changed)
• Tests added or updated (if applicable)
• No existing commands are broken (if they are, describe the impact above)

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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