Description of the Change

Added a security check to all PHP files in the Jobber plugin that could be executed directly. This ensures that if the files are accessed outside of WordPress, they will immediately exit, following WordPress.org plugin security guidelines.

Closes #47

How to test the Change

1. Attempt to access any PHP file in the Jobber plugin directly via the browser; the script should exit with no output.
2. Activate and use the plugin in WordPress to ensure normal functionality is unaffected.

Changelog Entry

Security - Added ABSPATH check to all executable PHP files to prevent direct access.

Credits

Props @dkotter @faisal-alvi

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.