[WIP] Address feedback on feat/events pull request

[Copilot]

• Fix docstring closing indentation in cleanup_exit.c to align with opening /**
• Validate changes against other files in the codebase
• Run final code review
• Add .gitignore to exclude build artifacts

Summary

Fixed documentation formatting in src/events/cleanup_exit.c:

• Changed docstring closing */ to align with opening /** (no indentation)
• Fixed indentation of all lines in the docstring to use single space after * instead of double space
• Now consistent with formatting style used in other files like events_handler.c
• Added .gitignore to prevent build artifacts from being committed

Security Summary

No security vulnerabilities detected.

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