Onboarding checklist now follows the real setup path

The "Set up your team" checklist on your home Space now walks the actual first-run path — connect an agent, then run the onboarding command from it — instead of leading with capture and Space-creation steps that assumed you already knew the product.
Each step tracks real progress: the first completes once an agent is connected, and the second completes once you've asked your connected agent to get started (a one-click "Copy prompt" button is included).