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Conflict in context/code/formula-and-io.md: #214 added FormulaId to the wire-type list, this branch added CategoryKind. Both kept. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze