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#356 stopped a bare suite run from overwriting the production `remote-hosts.json` by pointing `CODEMAN_DATA_DIR` at a throwaway dir, and it gated every case-tree delete on the temp HOME. Both changes are right; the explanation written next to them is not. It says `os.homedir()` reads /etc/passwd rather than `$HOME` on Linux, which would mean the temp HOME in test/setup.ts never worked. It does: libuv checks the env var before the passwd entry (measured: `HOME=/tmp/x node -e 'console.log(os.homedir())'` prints /tmp/x), and CLAUDE.md's testing section relies on exactly that. What bypasses the temp HOME is `CODEMAN_DATA_DIR` itself. `getDataDir()` reads it as an absolute override before it looks at `homedir()`, so one inherited from the shell (a second instance, a beta run) sends the whole suite at the real data dir. That is the case setup.ts now closes, and #371 names the same variable from the other direction. The comments in setup.ts, the `safeRmHomeTree` helper, the voice-routes and case-clone tests now say that, and the containment gate is described as what it is: defense in depth. CLAUDE.md's testing paragraph gets the same note so the next reader does not chase a homedir() bug that does not exist. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qg6bcATm1pNNY4kQWGwzgu