feat(frontend): tile-based office interior with LimeZu Modern Interiors tileset
- Replace outdoor farm scene with 20x15 tile office floor plan
- Add officeMap.js with tile definitions, map grid, walls, doorways, furniture
- Rewrite FarmCanvas.jsx with layered tile rendering (background, floor, walls, doors, furniture, agents)
- Use tileset.png for floor/wall/furniture tiles with proper source coordinates
- Design 6-room layout: Briefing Room, Commons, War Room, Engineering Bay, Quiet Zone, Ops Center
- Central hallway connecting all rooms with doorway openings
- Room labels drawn as floating pills
- Default agent positions reassigned to appropriate rooms
- Remove old BeOS icon tiles (replaced by LimeZu tileset)
Engineering (agent-engineering)
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