This pull request introduces a new PHPCS sniff, DisallowVoidTypeSniff, to the yCodeTech standard. The sniff enforces the rule that explicit void return type declarations are not allowed on functions, methods, or closures - absence of a return type already implies void. The PR includes documentation, the implementation of the sniff, comprehensive tests, and updates to the test files and README.

Sniff Implementation

• Introduced the new DisallowVoidTypeSniff in yCodeTech/Sniffs/Types/DisallowVoidTypeSniff.php, which detects and auto-fixes explicit : void return types in function, method, and closure signatures.

function example(): void {}

Testing and Test Coverage

• Added a new test file (DisallowVoidTypeUnitTest.inc) and its fixed counterpart to verify detection and auto-fixing of explicit void return types, ensuring the sniff works as intended.
• Created a unit test class (DisallowVoidTypeUnitTest.php) to assert that the sniff flags the correct lines and does not produce warnings.

Documentation Updates

• Updated inline documentation in existing test files to clarify that explicit void return types should now be flagged and auto-fixed, and to specify what should and should not be fixed.
• Create xml documentation for the sniff.
• Update README with the new sniff documentation.

These changes collectively add a new rule to the coding standard, improve documentation, and ensure robust automated testing for the new behaviour.

~ Summary partly generated by Copilot