Mission 019fcd0c produced correct work — a reviewed, tested function plus a REVIEW.md quoting a real cargo test summary — and delivered none of it: git commit → exit 128: could not open '.git/COMMIT_EDITMSG': Permission denied The agent ran `git commit` itself inside the mission container (as root), leaving that file owned by root at 0644. core.sharedRepository covers objects and refs — .git/index lands at 0666, which is why commits work at all — but not COMMIT_EDITMSG, which git writes with the default umask. Unlinking works where overwriting does not: removing a file needs write permission on the DIRECTORY, and .git/ is owned by the server. Silent on failure by design, so the commit reports the real error rather than this speculative cleanup. Third distinct instance of the same uid-split class (objects, then the capture base, now this). The pattern holds: the checkout is one directory written by two users, and each new file git touches is a new opportunity. Co-Authored-By: Claude Opus 5 <[email protected]>