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Their ids and displays are hardcoded; an old file's _Measure names are recognised, not migrated as declarations. Open question 2 narrows to where a new-version file declares the stored measures. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze