- Add GitHubRateLimitError and GitHubDownloadError for better error handling
- Detect rate limits (403 with remaining=0, 429)
- Try downloading from GitHub releases first
- Fall back to bundled assets on network error, rate limit, or download failure
- Add --offline flag to skip GitHub download
- Use GitHub auto-generated archive URL as fallback when no ZIP asset exists
- Update CLI to v1.9.0
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>