New endpoints:
- POST /api/action/screenshot: capture screenshot to file
- GET /api/screenshot/latest: serve PNG binary
- POST /api/action/camera: move camera to (x,y) + set zoom
- GET /api/state/camera: get current camera position/zoom
Pipe/Wire crossing intelligence:
- build_pipe/build_wire now detect existing pipes/wires at each cell
- mode='line' (default): new pipe merges with existing
- mode='cross': auto-places bridges at intersections to avoid connection
- mode='single': one segment
CLI: snapshot [file.png], camera <x> <y> [zoom], camera_status
All high-level commands: auto pause, execute, resume
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