Onboard with zero authored docs

For: Adopter

Part of: pkg-universal-docs

Steps

• Install (cli) — @smithgray/usm in a repo that has no docs-source/ of its own
• Run (cli) — usm generate
• Review (browser) — Getting Started and Agent Setup Guide pages in the docs preview — onboarding exists with zero authored content
• Follow (browser) — the agent-setup guide links into the per-editor MCP setup guides

How this is verified

• agent-setup-guide.md and editor-setup/index.md exist in the docs output tree
• sidebar contains Editor Setup and Agent Setup Guide entries
• homepage shows the Getting Started link