New Workspace assistant

Add Website mutations to the Workspace assistant

The Workspace assistant can now create, update, publish, and delete team Websites through the normal Website service.

The Workspace assistant now supports creating, updating, publishing, and deleting one exact team Website. Website searches return metadata rather than page documents. Updates use the current Website version and preserve publication state. Publishing and deletion require explicit confirmation in the current message. Successful writes return durable server-issued results and links.