copy: supported only in the Desktop version

I installed `rlwrap` with homebrew. In the shell I get

```
✦ ❯ cht.sh --shell
type 'help' for the cht.sh shell help
cht.sh> xargs
cht.sh> c
copy: supported only in the Desktop version
```

Reproduce the report through the `cht.sh --shell` entry point using the `xargs` lookup and the `c` command, with the reported Homebrew `rlwrap` setup. Trace where the shell handles `copy` and why it reports Desktop-only support; completion should establish and verify the intended shell behavior. No source file or test is named in the issue.

Written by the indexing model from the issue text.