Check for existing installation in the onboarding prompt

[Arcadi4]

Documentation is

• Missing
• Outdated
• Confusing
• Not sure

Explain in Detail

The current onboarding prompt forces the agent to execute the installation script:

curl -fsSL https://vite.plus | bash

Sometimes, I'm just scaffolding/migrating a project with the prompt. Usually, this should be harmless, but I installed vp via Homebrew, so this prompt will always create a parallel installation which I have to remove later. I'm sure Linux users using their own system-level package managers will face the same issue.

Full prompt

I want to use Vite+ in my project. Vite+ is the unified toolchain for the web behind the `vp` CLI — one tool combining Vite, Rolldown, Vitest, tsdown, Oxlint, Oxfmt, and Vite Task, plus runtime and package-manager management.

First, read https://viteplus.dev/llms-full.txt to learn Vite+'s commands and configuration.

Install the `vp` CLI:
- macOS / Linux: curl -fsSL https://vite.plus | bash
- Windows (PowerShell): irm https://vite.plus/ps1 | iex

Then open a new terminal and run `vp help`. To scaffold a new project run `vp create`; to move an existing Vite project onto Vite+ run `vp migrate`.

Day-to-day commands: `vp install` (dependencies), `vp dev` (dev server), `vp check` (format + lint + type-check), `vp test` (tests), and `vp build` (production build).

Help me get set up and explain anything I should know.

Your Suggestion for Changes

Add a gate before installation:

- Install the `vp` CLI:
+ Install the `vp` CLI if it's not already on the system:

Modern models generally don't need a hint on using vp --version or which vp.

Relevant Page

https://viteplus.dev/guide

Reproduction (Optional)

No response

Steps to reproduce (Optional)

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