Generate a click completion file for bash/zsh and source it from the alias
block. Click's generated script queries completions by invoking the command
— but `ci` is a sudo shell function (env vars don't survive sudo, and `env
VAR=x ci` can't call a function), so rewrite the query to call the venv
python directly (read-only, no sudo) and drop zsh's `$+commands[ci]` guard.
Writes ~/.ci-completion.<shell>; removed cleanly on --uninstall (block strip).
Simone
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