invoke abstract method

Invokes the method on an instance with named arguments.

Parameters:

• instance: The object instance (null for static methods)
• arguments: Optional named arguments

Returns:

• The method's return value
• May return null for void methods

Throws:

• InvalidArgumentException if arguments don't match parameters
• NoSuchMethodException for invalid invocations

Example:

final result = method.invoke(instance, {'param1': value});

final result = method.invokeWithArgs(instance, null, [arg1, arg2]);