Website + Docs — Domain, hosting, and documentation site

## Goal

Documentation website for clitest.

## Scope
- Documentation site (syntax reference, getting-started guide, examples)
- Hosting (e.g. Hugo/Docusaurus + GitHub Pages)

## Open questions
- Static site generator? Hugo (Go ecosystem) vs. Docusaurus (React/MDX)?
- GitHub Pages or custom hosting?
- Auto-generate syntax reference from SPEC.md?
- Versioned docs?