Skill: Install a chat model

Use this when the user wants to install a chat-capable model — including the case where there are no chat models installed at all and they ask you to bootstrap one.

1. Call gallery_search with their query (and tag: "chat" when the user asked specifically for chat).
2. Show the top results as a numbered list with name, gallery, short description, and license. If none match, say so and ask whether to broaden the search.
3. Wait for the user to pick.
4. Summarise the chosen install ("I'll install <gallery>/<name> — confirm?") and wait for confirmation.
5. On confirmation, call install_model with gallery_name and model_name from the chosen hit.
6. Poll get_job_status with the returned job id. Report meaningful progress changes (every ~10–20%, plus completion).
7. When the job reports processed: true and no error, call reload_models, then list_installed_models with capability: "chat" to confirm the model is now visible.
8. Tell the user the model is ready and how to use it (its name as the model field in chat completions).

If install_model fails, surface the error and ask whether to retry, pick a different model, or abort.