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Eric Traut
89461ea683
## What changed Clean up older standalone releases after verifying the installed command, while holding the install lock. Retain the current and previously selected releases, along with releases used by running Codex processes or bundled helpers. Record selection history for all standalone installs and preserve it on no-op installs. Only remove validated, installer-owned release directories; skip cleanup when filesystem or process inspection cannot establish that removal is safe. Recheck process usage after moving a release aside and restore it if it is in use. ## Testing Add installer regression coverage for running helpers, helpers started during cleanup, repeated installs, failed installs, downgrades, and preservation of unowned directories and symlinks. GitOrigin-RevId: 8fb363750ace14b4f804fdcfcdb210540f49c928