feat: add gen setup command

[angeloashmore]

Resolves: #53

Description

Allow users to regenerate framework-specific setup files (Prismic client, slice simulator, preview routes, etc.) without re-running full project initialization.

This extracts the setup logic from onProjectInitialized into a new setupProject abstract method on the Adapter class, then exposes it as prismic gen setup. Supports --no-install to skip dependency installation. Skips files that already exist.

Replaces prismic status: The gen setup command replaces the status command from the proof-of-concept CLI. With gen setup, developers and agents can quickly generate all necessary files without first running status and manually generating the necessary files. status may come back for a different use later, but it it not needed now.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

How to QA ¹

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Note

Medium Risk
Introduces a new CLI command that writes framework setup files and modifies the Adapter initialization contract, so existing init flows could change behavior if any adapters or callers aren’t updated. File generation and dependency installation are relatively contained but can impact local project state.

Overview
Adds a new prismic gen setup command to regenerate framework-specific Prismic setup (client file, slice simulator, preview/revalidate routes, etc.) and optionally install dependencies via --no-install.

Refactors adapter initialization by extracting framework setup work from onProjectInitialized into a new required setupProject() method, called both by Adapter.initProject() and the new command; Next.js/Nuxt/SvelteKit adapters are updated accordingly (leaving onProjectInitialized as a no-op).

Adds tests covering help output, file generation, skipping existing files, and skipping dependency installation, and adjusts Vitest config to apply retries per project.

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