Ensure latest version of Lemonade is installed on local-ai-use

[danielholanda]

Description

This PR solves the issue below:

#152

CLI selected by name, not capability. find_cli() searches PATH for lemonade before lemonade-server and uses whichever it finds first. The lemonade-sdk pip package installs both: lemonade (an eval/benchmarking tool with no serve subcommand) and lemonade-server (the REST server). Pip users get the wrong binary, lemonade serve exits without error and without a server, and setup burns 90 s on a health check that can never pass. Fix: probe the candidate's --help for serve/pull subcommands instead of trusting the name.

The actual underlying issue is that Lemonade was targeting a stale version of Lemonade installed in the system. Pip installation has been deprecated for a few months now. This PR ensures that the skill knows what is the right version of Lemonade to install.

In the future, this install module should be shared across all Lemonade skills.

[danielholanda]

Addressed Sreeram's suggestions in the previous commit