DOCKER_DIR was computed before ACTUAL_HOME, so $HOME resolved to
/root (the root user's home) instead of the invoking user's home.
Files were created under /root/docker/ rather than ~/docker/.
Fix: compute ACTUAL_USER and ACTUAL_HOME first, then DOCKER_DIR.
https://claude.ai/code/session_01UZus2Q9gNTfUdqSMrhuX29