The check was `export PATH="$HOME/.local/bin:$PATH"` followed by
`command -v dotup`, which proves the export worked and nothing else. It passed
on every run while a real operator on a fresh box hit
`dotup: command not found`.
~/.local/bin is put on PATH only by the .zshrc this tier ships, for a zsh that
dotup itself installs. So on any new machine the first invocation must be
~/.local/bin/dotup -- which the README already documents -- and bare `dotup`
cannot work until zsh is installed and logged into.
Assert `-x ~/.local/bin/dotup` first, then export for the rest of the script's
convenience. Reproduced the original failure in a clean root container before
changing anything, and re-ran the end-to-end after: PASS.
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