fix: resolve TypeError in CLIRequest::parseCommand when argv is missing

[gr8man]

Description
In environments where $_SERVER['argv'] is not populated or explicitly set to null (e.g., during testing or non-standard executions), instantiating CLIRequest throws a TypeError: array_shift(): Argument #1 ($array) must be of type array, null given on modern PHP versions.

This PR resolves the issue by defaulting $args to an empty array before calling array_shift(). A corresponding unit test testParseCommandWithMissingArgv has been added to CLIRequestTest to ensure the class initializes properly under these conditions without throwing an error.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide