PowerShell attempt 1: python .\screen-recording.py --config .\.arena-device-local\screen-recording-fixture.json
Public reply: completed true, mediaSaved true, 1,084,510 bytes, 20 s, 3840x2160 gdigrab H.264.
Desktop measurement: first red On at 64.125 s; last On 84.375 s; Off again at 84.500 s.