Update copyright to reference SMITH instead of IETF

[goosetav]

Summary

• Changed IPR attribute from 'trust200902' to 'none' to remove IETF Trust references
• Added custom copyright notice that references SMITH instead of IETF Trust
• Maintained dual-license information (CC BY 4.0 and BSD 2-Clause)

Test plan

• Verify XML file renders correctly with xml2rfc
• Confirm copyright section displays SMITH instead of IETF

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