Improved Workspace assistant

Plan complete Workspace assistant operation coverage

The Workspace assistant roadmap now includes measured coverage of safe actions already available in Magpie.

The Workspace assistant roadmap now treats creating and changing Magpie records as a first-class product goal. Kanban board creation is the first bounded addition. A following coverage audit will compare the assistant with operations already available in Magpie and turn every safe missing operation into a separate implementation task. Unsupported, destructive, secret-bearing, payment, and cross-workspace actions remain subject to explicit safety review.