[Feature]: regenerate core using XMI from OMG website

[samatstariongroup]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the SysML2.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

download the formal spec from the OMG website and regenerate

https://www.omg.org/spec/SysML
MOF XMI for the SysML v2 Abstract Syntax - https://www.omg.org/spec/SysML/20250201/SysML.xmi