LiveReact: Show-Safe Stage Lighting

A working DJ's beat-reactive DMX lighting controller, taken toward a product in 13 pull requests over its 619 tests. Added crash relaunch in about a second with the operator's state kept, DMX hot-plug for when the interface is pulled mid-set, and a phone console on venue Wi-Fi that can make the show safer but never more intense. Strobe calibration from phone slow-motion keeps photosensitivity limits true in Hz, and CI runs on three operating systems against golden DMX frames.