Distance Regions

TODO:

• [ ] Add page-specific notes for autonomy-stack/lidar-safety/distance-regions.md after inspecting the real project files.
• [ ] Cross-link Distance Regions to the most relevant code, data, testing, and safety pages.
• [ ] Document the exact input entering this subsystem.
• [ ] Document the exact output leaving this subsystem.
• [ ] Map the subsystem to the owning runtime file or module.
• [ ] Describe the control priority when this subsystem disagrees with another subsystem.
• [ ] List the settings, constants, and flags that change this behavior.
• [ ] Add a failure-mode checklist for field testing.
• [ ] Add how to verify the subsystem on the bench before a driving test.
• [ ] Add how to verify the subsystem during a real outdoor run.
• [ ] Document serial port, packet format, reconnect behavior, and stale-scan handling.
• [ ] Add bench test steps with the LiDAR disconnected and reconnected.
• [ ] Document the safety priority order and manual override behavior.
• [ ] Add what must be true before any autonomous outdoor run.
• [ ] Add the exact source path, artifact path, or hardware component name.