Test an agent in the Playground from its editor

The agent editor no longer has a side panel. The preview and evaluation panel is gone. In its place, a card links to the Playground, opened on this agent.

The card is explicit about what the Playground does. There is no live preview of unsaved changes yet. The Playground tests a saved version, and you select the version by its name. To test a change, save it, then pick that version in the Playground.

Evaluation is no longer in the editor. The Evaluate this version button and the list of runs are gone. Start evaluation runs and review them from Evaluations in the sidebar.

Old links still open. A link to an agent's evaluation tab opens the editor. A member who cannot edit agents has no editor, so the link opens the Evaluations hub, filtered to that agent.