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improvise-tt22 merged into gh/main while this branch was open and dropped serde from core's document types, CategoryKind included, keeping only the wire types (Axis, PageAxis). TileEntry now carries a CategoryKind, so it joins them. formula-and-io.md's list of what remains is updated to say so. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze