Enable CodeQL scanning for security analysis

[runleveldev]

Add CodeQL scanning to the repository to improve security and automate vulnerability detection.

Expected Actions:

• Integrate CodeQL with CI workflow (GitHub Actions recommended).
• Configure scans for supported languages in the repo.
• Ensure scan results are visible in the Security tab.
• Document new workflow addition in README if relevant.

Benefits:

• Automated detection of common security issues and vulnerabilities.
• Enhance trust for contributors and users.

References:

• CodeQL documentation.