"""QuadrantOS — Visual operating surface for agents.

The screen is a terminal bus. Each quadrant is a port. Agents publish to ports.

Window identity is garbage. Quadrant identity is stable. Coordinates are the contract.

Four quadrants:
  Top-left:     observed code/workspace
  Top-right:    CodeReviewer output lane
  Bottom-left:  WebResearcher output lane
  Bottom-right: System/TaskManager/Status lane
"""