Explicit failures exited before the dispatcher could emit its result.
Unchecked writes could instead reach the success log. Run each stage
in an errexit subshell and emit one EXIT result with the actual status.
Escape JSON text before reporting paths or diagnostic messages.
Accept the desktop's home argument, derive the default install path
from it, and export it to child processes. Explicit install paths win.
Verified actual Bash stage calls over disposable repositories and
failed writes, plus the real CLI's argument and platform boundaries.
No complete POSIX installation or native package acceptance is claimed.
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