- Add --dry-run flag and Output::DryRun variant to preview HTTP requests without executing, emitting the resolved method, URL, headers, and body for agent inspection
- Add error hint field to ErrorInfo and Output::Error, providing actionable suggestions for common failures — DNS resolution, connect timeout, redirect loops, response size limits
- Upgrade agent-first-data dependency from 0.5 to 0.6 to use the new hint parameter on build_cli_error