- Avoid placing EXE inside node_modules on Windows and WSL-on-NTFS
- Add preinstall cleanup (global-only), limited to our EXE; age-guard stale .code-* dirs
- Atomic cache writes with retries; mirror to node_modules only on Unix filesystems
- Robust Windows unzip fallback chain (powershell.exe→powershell→pwsh→tar)
- Detect WSL drvfs/cifs with realpath mount check; skip taskkill on WSL
- Fallback to per-user cache if tmp staging dir is unavailable
- Package windows-cleanup.ps1 and preinstall script
