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- Add cell/tile map APIs: /api/state/cell, /api/state/cells, /api/state/cells/slice, /api/state/gas - Add entity registry APIs: /api/registry/buildings, /api/registry/elements, /api/registry/techs - Add plants, rooms, mop, harvest endpoints - Rich semantic metadata: element state/category, building category/power, duplicant chore/cell - AI-friendly coordinate system with (x,y) + cell index in all responses - Build AI_KNOWLEDGE_BASE.md with building IDs, element IDs, tech trees, game mechanics - Rewrite SKILL.md with data model explanation, coordinate guide, operation patterns - Update Python tools: explore, cell, cells, slice, gas, registry subcommands - Update MOD_DEV_GUIDE.md with AI data design principles