rzv CLI 0.9.0 documentation and pending portal updates

Go rzv CLI 0.9.0 documentation is available. Capacity, setup, onboarding, and billing preview updates remain pending the Core release.

• The Go rzv CLI 0.9.0 guide is available, with its installed commands and current workflow examples.
• Runzivo supports GitHub organization repositories, including GitHub Free organizations. Personal-account repositories are not supported.
• Pending Core release: runner capacity will show an actionable unavailable status when capacity cannot accept a job.
• Pending Core release: setup will stop showing a false permissions-pending status, and onboarding will explain each requested GitHub App permission. The onboarding flow will identify AI-write permissions as Early Access permissions.
• Pending Core release: billing preview wording will distinguish an example checkout state from live checkout availability.