feat: update models to UCP release 2026-04-08#28

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pjordan wants to merge 1 commit into

Universal-Commerce-Protocol:mainfrom

pjordan:worktree-feat-update-spec-2026-04-08

Google CLA / cla/google succeeded Apr 16, 2026 in 7s

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✅ bbf422a Author: @pjordan <patr********rdan@gmail.com>

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