New Workspace assistant

Add Presentation mutations to the Workspace assistant

The Workspace assistant can now create, update, publish, share, collaborate on, duplicate, and delete team Presentations through the normal Presentation service.

The Workspace assistant now supports creating, duplicating, updating, publishing, and deleting one exact team Presentation, changing private or public link sharing, and adding a direct collaborator. Draft updates and publishing use the current draft version; slide documents are bounded and sanitized and are not returned in assistant evidence. Publishing, sharing, collaborator access changes, and deletion require explicit confirmation in the current message. Successful writes return durable server-issued results and links.